Agreed Technical Requirements for Mutual Recognition

The current versions of the agreed Technical Requirements for the Mutual Recognition of selected Type Approved Products can be found below.

The application limitations and intended use of the products are specified in Section 1 of each Technical Requirement.

NOTE: These are controlled documents and users are responsible for ensuring that they are not working with obsolete versions of the documentation. Superseded or obsolete documents, within the control system, shall be removed promptly from this website. Controlled documents shall be reviewed by the EU RO MR Group at appropriate intervals to verify the continuing accuracy and applicability.

Further information about the EU RO MR Type Approval Scheme can be found in the Framework Document below:

Filter by letter

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 0-9 all

AC Semiconductor Controllers

General description of the product

Description of product according to IEC 60947-4-3:
"Low-voltage a.c. semiconductor controllers are semiconductor switching devices that provide a switching function for an a.c. electrical load (non-motor load) between the ON-state and the OFF-state."

Current Version: 0.3
Application Date: 2023-07-01

 download TR

 view all documents

Accumulator Battery

General description of the product

Accumulator battery also known as storage battery is secondary battery designed to be electrically rechargeable. Lead acid battery is a type of accumulator battery widely used on board as main or emergency power source for automatic system and equipment, communication, lighting appliance etc. and for engine starting. The lead acid battery can be subdivided into two types-vented type and valve regulated type:

- Vented (flooded) battery: a vented battery is a secondary battery having a cover provided with one or more openings through which gaseous products may escape;

- Valve-regulated (with gas recombination) battery: a valve-regulated battery is a secondary battery that is closed under normal conditions and has an arrangement that allows the escape of gas if the internal pressure exceeds a predetermined value. The battery cannot normally receive an addition of water or electrolyte. In this type of battery, the electrolyte is immobilised.

Current Version: 0.4
Application Date: 2023-07-01

 download TR

 view all documents

Adjustable Steel Chocks

General description of the product

Adjustable steel chocks are foundation chocks for rigid seatings of heavy machinery and equipment, which require precise alignment and adjustment. The Technical Requirements apply to metal chocks with adjustable height setting by an internal screw connection combined with the capability of self-levelling, thus called 'Adjustable Steel Chocks'. The material used for the adjustable steel chocks includes non-alloy as well as alloyed steel, including stainless steel.

Current Version: 0.3
Application Date: 2023-07-01

 download TR

 view all documents

Air Compressor

General description of the product

These technical requirements apply to air compressors of reciprocating and rotary displacement type.

Compressor unit consists of the device for compressing the medium along with its unit internal piping for air medium as well as the necessary system for cooling and lubrication.

Current Version: 0.3
Application Date: 2023-07-01

 download TR download TI

 view all documents

Air Pipe Automatic Closing Device

General description of the product

These Technical Requirements apply to air pipe closing devices required by the Protocol 1988 relating to the Load Line convention 1966 and its adoptions Load Line convention, 1966 to be fitted with automatic closing devices.

Current Version: 0.5
Application Date: 2023-07-01

 download TR

 view all documents

new version applicable from
2024-07-01

Anti-Acid Paints (Batteries's Storage Rooms)

General description of the product

Anti-acid paints intended for protection of the interior of battery storage room against corrosion by electrolyte.

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents

Battery Chargers

General description of the product

(a) A battery charger is a device used to put energy into a secondary cell or rechargeable battery by forcing an electric current through it.

(b) Charger equipment shall be suitable for the type of storage batteries, the required charging characteristic, and the selected connection.

Current Version: 0.4
Application Date: 2023-07-01

 download TR

 view all documents

Boiler Remote Level Indicator

General description of the product

a) Remote indicators of steam boiler water level, of the "indirect reading design" type. They can be based on different working principles and technologies, such as, for example:

- Conductivity Probes

- Differential Pressure Transmitters

- Magnetic Float Indicators

- Guided Wave Radar Level Indicators

b) Regardless of technology, their basic configuration includes:

- one or more sensing devices, appropriately connected to the boiler drum (either directly or through an externally located measuring vessel, such as a water column); the sensing devices can be totally or partly immersed in the steam-water space;

- a transmitter (usually converting the original signal into the 4-20 mA analogic format);

- a remote level display.

c) Regardless of technology, the devices normally include some means for correction of density error, generated by difference of temperature between the water in the drum and that contained within a measuring vessel located externally at the boiler drum (e.g. the water column), due to sub-cooling of water in the measuring vessel.

d) The pressure vessels containing the sensor(s) (e.g. externally located measuring vessels, water column or equivalent) are outside the scope of the present Technical Requirement.

e) Level indicators of the direct reading type (such as reflex gauges, flat glass gauges, ported gauges and similar devices) are outside the scope of the present Technical Requirement.

f) The equipment for control of the boiler (e.g. water level control, pressure control, temperature control) is subject to individual EU RO approval and is outside the scope of this Technical Requirement.


Current Version: 0.3
Application Date: 2023-07-01

 download TR

 view all documents

Cable Glands

General description of the product

Cable glands are devices designed to permit the entry of a cable, flexible cable or

insulated conductor into an enclosure, and which provides sealing and retention. It may

also provide other functions such as earthing, bonding, insulation, cable guarding, strain

relief or a combination of these.

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents

new version applicable from
2024-07-01

Cable Ties

General description of the product

Cable ties are fixing devices for bundling or tying groups of cables together. They may be of metallic, non-metallic or of composite design.

Current Version: 0.4
Application Date: 2023-07-01

 download TR

 view all documents

Cable Trays & Ducts (Glass Reinforced Plastic / GRP)

General description of the product 

Cable Trays and ducts (glass reinforced plastic) used on board ships. 

Current Version: 0.3
Application Date: 2023-07-01

 download TR

 view all documents

Cable Trays & Ducts (Metallic)

General description of the product

Metallic cable trays and ducts suitable for marine use.

Current Version: 0.3
Application Date: 2023-07-01

 download TR

 view all documents

Circuit Breakers (Without Electronic Devices)

General description of the product

Description of product according to IEC IEV 441-14-20:

Circuit breaker: A mechanical switching device, capable of making, carrying and breaking currents under normal circuit conditions and also making, carrying for a specified time and breaking currents under specified abnormal circuit conditions such as those of short circuit.

Current Version: 0.7
Application Date: 2023-07-01

 download TR

 view all documents

Circuit Breakers With Electronic Devices

General description of the product

Description of product according to IEC IEV 441-14-20:

Circuit breaker: A mechanical switching device, capable of making, carrying and breaking currents under normal circuit conditions and also making and carrying currents for a specified time under specified abnormal circuit conditions, and breaking currents under specified abnormal circuit conditions such as those of short circuit.

Current Version: 0.5
Application Date: 2023-07-01

 download TR

 view all documents

Class III Pipes Fittings (DY<=500 mm)

General description of the product

Fittings are pipelines formed components bends, elbows, tees, plugs, reducers, diameter change transition pieces, adapters, caps etc., and other elements of pipelines, intended for pipelines branching and changing of conveying medium direction.

Current Version: 0.4
Application Date: 2023-07-01

 download TR

 view all documents

Computers and Programmable Logic Controllers (PLCs)

General description of the product

Computers and programmable logic controllers (PLC) intended to be used in systems that provide control, monitoring, alarm and safety functions that are subject to classification requirements. Aids to navigation and loading instruments are excluded.

Current Version: 0.8
Application Date: 2023-07-01

 download TR download TI

 view all documents

Connecting Systems For Cable Repair (Cable Splices)

General description of the product

a) Cable splices shall consist of a conductor connector, replacement insulation, replacement cable sheath, and where applicable, replacement of armour and shielding;

b) Heat-shrinkable tubing shall mean tubing that will reduce in diameter from an expanded size to a predetermined size by the application of heat.

Current Version: 0.3
Application Date: 2023-07-01

 download TR

 view all documents

Contactors (Without Electronic Devices)

General description of the product

The description of the product is used according to IEC IEV 441-14-33:

Contactor: a mechanical switching device having only one position of rest, operated otherwise than by hand, capable of making, carrying and breaking currents under normal circuit conditions including operating overload conditions.

Current Version: 0.7
Application Date: 2023-07-01

 download TR

 view all documents

Contactors With Electronic Devices

General description of the product

The description of the product is used according to IEC IEV 441-14-33.

Contactor: A mechanical switching device having only one position of rest, operated other than by hand, capable of making, carrying and breaking currents under normal circuit conditions including operating overload conditions.

Current Version: 0.5
Application Date: 2023-07-01

 download TR

 view all documents

Control And Protective Switching Devices

General description of the product

A switching device (or equipment) capable of operation other than by hand, but with or without local manual operating means. It is to be capable of making, carrying and breaking currents under normal conditions, including specified operating overload conditions and making, carrying for a specified time and breaking currents under abnormal conditions such as those of short circuits.

Current Version: 0.3
Application Date: 2023-07-01

 download TR

 view all documents

Corrosion - Resistant Paints

General description of the product

Paints or paint systems intended for the corrosion protection of steel structures.

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents

Differential Pressure Switches

General description of the product

Differential pressure switches are used in applications to signal that a predetermined pressure difference has been reached as a result of widening or narrowing difference between the two points within piping systems or machinery.

A conventional differential pressure switch is generally a simple electro-mechanical device that operates on the basic principles of lever and opposing forces connected with the diaphragm, metallic or elastomeric elements deformable due to pressure acting on the elements. The pressure difference creates a force which then overcomes that of a pre-tensioned spring and in the process, moves a balancing arm or mechanism to effect the minimal movement required to actuate the micro-switch of the switch.

Electronic differential pressure switches which are microprocessor-controlled differential pressure measurement devices with pressure sensors, such as piezo-electric pressure sensor, potentiometric pressure sensor, differential capacitance, etc. are also available.

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents

Display Monitors, Video Screens, Terminals

General description of the product

Display monitors and video screens for monitoring the conditions of systems,  machinery and equipment (this excludes touch screens or terminals with keys and buttons).

Current Version: 0.6
Application Date: 2023-07-01

 download TR

 view all documents

Dual Temperature and Pressure Switches

General description of the product

Dual Temperature and Pressure Switches (hereinafter switches) have both temperature and pressure measurement capabilities with relevant output change-over and combined within the same device. Switches may have electric and/or electronic parts and be externally power supplied.

Temperature sensors may be based on several working principles: bi-metallic (BM), liquid expansion (LE), gas-expansion (GE), thermo-resistors (RTD), thermocouples (TC), infrared (IR), etc.; the relevant features of which vary accordingly. According their working principle the movement directly act on the opening and closing of an electrical switch or the sensor respond to temperature by changing the electrical performance.

Pressure sensors of different types of sensing elements can be used but they have one thing in common: they move in response to changes in the system pressure. Through their movement, they directly act on the opening and closing of an electrical switch (without requiring any power supply).

Electronic/solid state pressure sensors use the same technology found in analogue pressure transmitters to sense changes in pressure rather than harnessing the energy of the pressure changes to mechanically operate a switch (as with electromechanical pressure switches).

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents

Electric Cables - Heating Cables

General description of the product

Heating cables for electrical resistance trace heating systems.

Current Version: 0.5
Application Date: 2023-07-01

 download TR

 view all documents

Electric Driven Motors

General description of the product

These Technical Requirements apply to electric driven motors < 20 kW.

Current Version: 0.5
Application Date: 2023-07-01

 download TR

 view all documents

Electric Space Heating Equipment

General description of the product

Devices intended for heating of accommodations, for habitability purposes.

These devices are typically known as space heaters.

Water heaters, oil heaters, heating batteries for ventilation systems and space heaters

combined with air condition cabinets assumed not to a part of this document.

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents

Electric motor starters other than soft starters

General description of the product

AC motor-starters, Direct-on-line (full voltage) a.c. starters, Star/Delta starters.

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents

Electrical / Electronic Relays

General description of the product

Relays means:

a) devices designed to produce sudden, predetermined changes in one or more electrical output circuits when certain conditions are fulfilled in the electrical input circuit controlling the device;

b) thermal electrical relays which protect equipment from electrical thermal damage by the measurement of current flowing in the protection equipment;

c) measuring relays (including time relays) and protection equipment including any combination of devices for power system protection such as control, monitoring and process interface equipment.

Current Version: 0.6
Application Date: 2023-07-01

 download TR download TI

 view all documents

Electrical Actuator For Valves

General description of the product

Electrical valve actuator is an electromechanical device used for on-off and control valves.

Current Version: 0.4
Application Date: 2023-07-01

 download TR

 view all documents

Electrical Insulation Mats

General description of the product

Electrical insulation mats are made of elastomer for use as a floor covering for the electrical protection of ship crew.

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents

Electro-Pneumatic Level Transmitters (EPLT)

General description of the product

Electro-pneumatic level transmitters (EPLT), usually consisting of:

- a pneumatic unit, supplied by an external source of compressed air (instrument air quality – Class III piping system, P<16 bar, T<200°C), incorporating filtering device(s), non-return valve(s), a safety valve, an air pressure regulator, and a connection to a sounding/bubbling pipe (immersed in tank from tank top and terminating with an open end close to the bottom);

- an air pressure sensing device;

- an electric transmitter.

The pressure sensing device and the electric transmitter, together, can be identified as a “pressure transducer”.

The level measurement is obtained indirectly, through measurement of the air backpressure needed for bubbling of air through the liquid content of the tank: such pressure is in direct proportion with the height and the specific gravity of the liquid above the sounding pipe lower termination, plus (in case of inerted tanks) the pressure of the inert gas itself.

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents

Electronic Power Units For Valve Control

General description of the product

Electronic power unit for valve control means an integrated unit that includes an electronic control module and a power module to drive the valve.

Current Version: 0.2
Application Date: 2023-07-01

 download TR

 view all documents

Expansion Joints

General description of the product

a) Expansion joints made of composite construction, utilizing metallic material (e.g. steel, stainless steel, or equivalent material wire braid) with rubberized/elastomeric coatings inside and/or outside or similar arrangements;

b) External fire-resistant sleeves may be accepted, if needed, to ensure fireresistant characteristics;

c) Full-metal bellow-type expansion joints are covered by a different set of Rules and therefore cannot be considered within this specific technical requirement.

Current Version: 0.4
Application Date: 2023-07-01

 download TR

 view all documents

Flameproof Luminaire (Lighting Fixture)

General description of the product

a) Description of product according to IEC IEV 845-10-07;

b) Luminaire (or lighting fixture) which satisfies the appropriate regulations applicable to equipment with explosion-proof enclosure, for use in situations where there is a risk of explosion and in vessel's environmental conditions as referred in Table 2.1, 2.2 and 2.3;

c) Specification according to requirements of IEC 60092-306 (which mainly refers to IEC 60079-1 for flameproof enclosure "d" luminaires, IEC 60598-1 General Requirements and tests for Luminaires).

Current Version: 0.4
Application Date: 2023-07-01

 download TR

 view all documents

Flow Gauges / Transmitters

General description of the product

Liquid flow meters used in continuous metering applications.

- Principle of operation: mechanical flow meters (e.g. positive displacement meter), pressure-based flow meters (e.g. differential pressure), optical flow meters, thermal mass flow meters.

- Power supply of electronic components (e.g. pulse transmitters): external or internal (batteries).

Current Version: 0.3
Application Date: 2023-07-01

 download TR download TI

 view all documents

Flow Switches

General description of the product

Fluid flow switches are generally made of a casing containing the switch and a probe or other similar device projecting from the same and immersed in, or in other ways sensing the presence of, the fluid flow (set-in type). The device may include a short pipe fitting (flow-through type): in this case, the pipe fitting as well as any other component subject to internal pressure of fluid is not covered by the scope of the present Technical Requirement.

Based on the principle of operation, the following types are considered: mechanical flow switches (e.g. paddle-type, shuttle-type, piston-type) and pressure-based flow switches (e.g. differential pressure).

In general, flow switches are intended to open/close an electrical circuit (signal) upon reaching of a certain set point of flow, and are actuated by the energy conveyed by the fluid. Electronic components, when fitted, may be supplied by an external source of power or by internal batteries. Software based flow switches are not covered by the scope of this TR.

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents

Fuses

General description of the product

a) Fuses are over current protective devices that contain a calibrated current carrying element which melts and opens under specified over current conditions;

b) Fuses are individual devices and can have different shapes. Connection to a circuit is normally carried out through the use of single or multi fuse bases or fuse holders, as required;

c) Fuses are to be classified according to applicable parts of IEC standards 60269-1, IEC 60269-2, IEC 60068-2 and IEC 60721-3, as applicable.

Current Version: 0.4
Application Date: 2023-07-01

 download TR

 view all documents

Gaskets and Seals for Piping Systems

General description of the product

Gaskets and seals of rubber and plastic materials for piping systems are intended for sealing pipe connections.

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents

Insulation Monitoring Devices (IMD)

Insulation monitoring devices (IMD) permanently monitor the insulation resistance to earth of unearthed IT systems.

Types of IMDs

a) Type AC IMD for pure a.c. IT systems,

b) Type AC /DC IMD for a.c. and d.c. systems,

c) Type DC IMD only for pure d.c. IT systems,

Current Version: 0.3
Application Date: 2023-07-01

 download TR

 view all documents

Insulation Panels for Provisions Rooms & Chambers

General description of the product

These technical requirements apply to rigid polyurethane foam panels used to insulate refrigerated provision chambers. Panels can be of the built-up (fabricated in place) or composite design.

Current Version: 0.3
Application Date: 2023-07-01

 download TR

 view all documents

Inverters

General description of the product

This Technical Requirement provides MR type approval requirements for static power

inverters, that is power electronic devices that change direct current (DC) to alternating

current (AC) at specified voltage and frequency.

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents

LV Enclosures & Boxes

General description of the product

a) Empty enclosure - enclosures intended for support and installation of electrical equipment, whose internal space provides suitable protection against external influences, as well as a specified degree of protection against approach to or contact with live parts and against contact with moving parts;

b) Empty box - enclosures, generally of small dimensions and, in principle, intended to be mounted on a vertical plane.

Current Version: 0.4
Application Date: 2023-07-01

 download TR

 view all documents

LV Soft Starters

General description of the product

Soft starter is a special form of a.c. motor controller with suitable overload protection, rated as a unit and in which the starting function is limited to a voltage and/or current ramp that may include controlled acceleration, and where the additional control functions is limited to providing ‘FULL-ON’.

Current Version: 0.3
Application Date: 2023-07-01

 download TR

 view all documents

LV Transformers

General description of the product

a) This technical requirement applies to three-phase power transformers rated at greater than 5 kVA and single phase power transformers rated at greater than 1 kVA (including auto-transformers), up to a power limit of 50k VA **(50k VA when single phase)**;

b) This technical requirement does not apply to special transformers as per IEC 60076 -1;

c) This technical requirement does not apply to the special transformers intended for Ice Breakers and ships with an ice class, on high-speed crafts, on ships with nuclear power plant and on other special objects with more severe environmental conditions or where raised reliability of the equipment is required.

Current Version: 0.4
Application Date: 2023-07-01

 download TR

 view all documents

new version applicable from
2024-07-01

Level Gauges / Transmitters

General description of the product

a) These technical requirements (TR) are meant to cover mechanical and electronic level gauges/transmitters for non-essential systems on board classed vessels.

b) Measuring principles may typically be:

- Microwave radar level transmitter;

- Guided wave radar level transmitter;

- Ultrasonic level transmitter;

- Capacitive (rod) level transmitter;

- Float level gauge/transmitter;

- Magnetic float level gauge/transmitter.

c) These MR technical requirements (MR TRs) do not cover:

- Control, monitoring and safety functions for primary- or secondary essential services, as defined by IACS Unified Interpretations SC134;

- Glass level gauges, magnetic glass level gauges, self-powered gauges with diaphragm and capillary tube or other mechanical gauging principles that penetrate the tank where testing according to IACS UR P2 (Rules for piping design, construction and testing) typically is required;

- Boiler remote level indicator - see separate MR TR for ‘BOILER REMOTE LEVEL INDICATOR’ (Tier 3);

- Electro-pneumatic level transmitters - see separate MR TR for ‘ELECTRO-PNEUMATIC LEVEL TRANSMITTERS (EPLT)’ (Tier 5);

- Pressure gauges/transmitters see separate MR TR for ‘PRESSURE GAUGES/ TRANSMITTERS’ (Tier 5);

Current Version: 0.2
Application Date: 2023-07-01

 download TR

 view all documents

Level Switches

General description of the product

Level switches are devices composed of an electrical switch operated by a sensor able to detect the presence of a liquid at given levels.

Depending on the type of sensor used for detecting the liquid level, the following level switches are considered:

a) Level switches based on floating principle;
b) Reed level switches operated by magnetic float;
c) Level switches based on capacitive sensor;
d) Level switches based on conductive sensor;
e) Level switches based on ultrasonic sensor;
f) Level switches based on radar sensor;
g) Level switches based on optical sensor;
h) Level switches based on vibrating fork sensor;
i) Level switches based on hydrostatic sensor.

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents

Mechanical Joints

General description of the product

a) These Technical Requirements apply to mechanical joints, so called slip type or grip type or machine grooved type, both for fire resistant and non-fire resistant type;

b) “Mechanical Joints" means devices intended for direct connection of pipe lengths other than by welding, flanges or threaded joints.

Current Version: 0.5
Application Date: 2023-07-01

 download TR

 view all documents

new version applicable from
2024-07-01

Non-Metallic Gratings

General description of the product

Glass fiber reinforced plastic (GRP) gratings for use on board vessels and intended for personnel walkways, catwalks, grids used for detachable steps in stairs, ladders, platforms and access areas. Generally used in lieu of steel grids because of their light weight, low thermal conductivity and resistance to corrosion.

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents

Pilot Devices

General description of the product

Pilot devices are devices which communicate between human operators and machines using the following control circuit devices and switching elements:

- manual control switches, e.g. push-buttons, rotary switches, joystick etc.;

- associated control circuit equipment, e.g. indicator lights, etc.

Current Version: 0.4
Application Date: 2023-07-01

 download TR

 view all documents

Plastic Piping Systems (Components)

General description of the product and definitions

a) Plastic(s) means both thermoplastic and thermosetting plastic materials with or without reinforcement, such as PVC and FRP (fiber reinforced plastics);

b) Plastic includes synthetic rubber and materials of similar thermo/mechanical properties;

c) Pipes/piping systems means those made of plastic and include the pipes, fittings, joints, and any internal or external liners, coverings and coatings required to comply with the performance criteria. Fittings include bends, elbows, fabricated branch pieces, etc. made of plastic materials;

d) Joint means joining pipes by adhesive bonding, laminating, welding, etc.;

e) Fittings include bends, elbows, fabricated branch pieces, etc. made of plastic materials;

f) Nominal pressure is the maximum permissible working pressure which shall be determined in accordance with 2.a.i.1.2 below;

g) Design pressure is the maximum working pressure which is expected under operation conditions or the highest set pressure of any safety valve or pressure relief device on the system, if fitted;

h) Fire endurance is the capability of the piping system to perform its intended function, i.e. maintain its strength and integrity, for some predicted period of time while exposed to fire.

Current Version: 0.4
Application Date: 2023-07-01

 download TR download TI

 view all documents

new version applicable from
2024-07-01

Pneumatic Actuators For Valves

General description of the product

A pneumatic actuator for valves is a component which directly converts air pressure into mechanical action, opening and closing the operated valve.

Current Version: 0.3
Application Date: 2023-07-01

 download TR

 view all documents

Position Switches

General description of the product

Position switches and proximity switches suitable for marine use. Definitions according to IEC 60947-5-1 and IEC 60947-5-2:

• Position switch: "a pilot switch the actuating system of which is operated by a moving part of the machine, when this part reaches a predetermined position";

• Proximity switch: "a position switch which is operated without mechanical contact with the moving part";

The output of a position/proximity switch is determined by the presence or absence of a designated object. This digital output could be represented by a switched-, voltage-, current-, resistance- or frequency signal.

Typical principles of operation for sensing includes, but are not limited to:

• mechanical, capacitive, inductive, ultrasonic, photoelectric.

Current Version: 0.2
Application Date: 2023-07-01

 download TR

 view all documents

Power supply units (<5kVA)

General description of the product

A power supply unit (PSU) converts mains AC or DC power for supplying, for instance,

process control, automation, instrumentation or communication systems. Conversion

may be AC/DC, AC/AC, DC/AC or DC/DC using switched-mode power supplies.

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents

Pressure Gauges - Transmitters

General description of the product

Pressure gauges/transmitters are electromechanical devices (typically stainless steel or ceramic diaphragm) suitable for marine use. It is used to deliver pressure information locally or to a remote position.

The conversion of pressure into an electrical signal is achieved by the physical deformation of strain gages which are bonded into the diaphragm of the pressure transducer. Pressure applied to the pressure transducer produces a deflection of the diaphragm which introduces strain to the gages. The strain will produce an electrical resistance change proportional to the pressure.

Generally, there are three different types of electrical output available:

i) Millivolt Output - Pressure Transducers: The output of the millivolt transducer is nominally around 30mV. The actual output is directly proportional to the pressure transducer input power supply or excitation. If the excitation fluctuates, the output will change also. Because of this dependence on the excitation level, regulated power supplies are suggested for use with millivolt transducers. Because the output signal is so low, the transducer should not be located in an electrically noisy environment. The distances between the transducer and the readout instrument should also be kept relatively short.

ii) Voltage Output - Pressure Transducers: The output is normally 0-5Vdc or 0-10Vdc. Because they have a higher level output these transducers are not as susceptible to electrical noise as millivolt transducers and can therefore be used in much more complicate environments.

iii) 4-20 mA Output - Pressure Transducers: Since a 4-20mA signal is least affected by electrical noise and resistance in the signal wires, these transducers are often used when the signal must be transmitted to long distances. It is not uncommon to use these transducers in applications where the lead wire must be a few hundred meters or more.

Current Version: 0.2
Application Date: 2023-01-07

 download TR

 view all documents

Pressure Relief Valve in Class III Piping System

General description of the product

Pressure relief valve in class III piping system as defined by IACS UR P2.2 Rev.4 intended to the valves in class III pipelines systems which automatically, without the assistance of any energy other than that of the fluid concerned, discharges a quantity of the fluid so as to prevent a settled safe pressure being exceeded, and which is designed to re-close and prevent further flow of fluid after normal pressure conditions of service have been restored.

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents

Pressure Switches

General description of the product

A pressure switch is simply a device capable of detecting a pressure change and, at a predetermined pressure, opening or closing an electrical switch. There are two basic types of pressure switches: electromechanical and electronic/solid state. The electromechanical pressure switches are composed of a sensing element and an electrical switch. A number of different types of sensing elements can be used but they have one thing in common: they move in response to changes in the system pressure. Through their movement, they directly act on the opening and closing of an electrical switch (without requiring any power supply. Electronic/solid state pressure switches use the same technology found in analogue pressure transmitters to sense changes in pressure. Rather than harnessing the energy of the pressure changes to mechanically operate a switch (as with electromechanical pressure switches), electronic/solid state pressure switches electrically measure pressure change and internal electronic circuitry is used to activate one or more electronic switch outputs. With electronic/solid state switches, an external power supply is necessary to power the electronic circuitry inside the switch.

Current Version: 0.2
Application Date: 2023-07-01

 download TR

 view all documents

Resilient mountings of machinery

General description of the product

A resilient mounting is an item designed to incorporate rigid members for attachment

and resilient elements for the purpose of isolating shock, noise, and vibrations of a

continuous or intermittent origin and to serve as a foundation support for an item of

equipment to be isolated. 

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents

Resin Chocks

General description of the product

Mixture of resins (usually epoxy resin) and specific additives, mainly characterized by high values of mechanical properties, with particular regard to compression module, resistance to water and oils, and stability over time.

Current Version: 0.4
Application Date: 2023-07-01

 download TR

 view all documents

Sensors

General description of the product

Electrical and electronic sensors (including P & T transducers) suitable for marine use.

Current Version: 0.5
Application Date: 2023-07-01

 download TR download TI

 view all documents

Solenoid Valve Assembly

General description of the product

a) Solenoid valve assembly is a type of directional remote control valve which is controlled by an electric solenoid. It is composed of a solenoid component and actuator of valve, intended for controlling medium conveying on-off or changing of conveying medium direction in hydraulic fluid system and pneumatic fluid system on board ships;

b) The move of the (pilot) valve core is pushed by the iron core of solenoid, and reset is usually controlled by spring force.

Current Version: 0.3
Application Date: 2023-07-01

 download TR

 view all documents

Spark Arresters

General description of the product

These Technical Requirements apply to devices, commonly known as spark arresters, which prevent the emission of sparks by diesel engines, boilers and equipment containing sources of ignition and which could lead to the ignition of flammable materials.

Current Version: 0.4
Application Date: 2023-07-01

 download TR

 view all documents

Stationary Lighting Fixtures / Flood Light Projectors

General description of the product

a) Complete lighting units, designated as light fixture, light fitting or luminaries, and hereinafter referred as luminaries, are electrical devices used to create artificial light, by the use of one or more lamps (bulbs or tubes that emit light), along with the socket and other parts that protect and hold the lamp in place;

b) Luminaries have a fixture body and may have a reflector that helps to direct and distribute the light. Luminaries are mostly ceiling or wall-mounted fixtures. Generic name of luminaries also includes floodlights as a specific type.

Current Version: 0.3
Application Date: 2023-07-01

 download TR download TI

 view all documents

Strainers

General description of the product

Strainers are elements of pipelines, intended to remove larger, unwanted suspended

particles that are visible in conveying media, primarily to protect downstream equipment

(like pumps) from damage.

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents

Switches

General description of the product

Description of product according to IEC IEV 441-14-10:

Switch (mechanical): is a mechanical switching device capable of making, carrying and breaking currents under normal circuit conditions which may include specified operating overload conditions and also carrying for a specified time currents under specified abnormal circuit conditions such as those of short circuit.

Note: a switch may be capable of making but not breaking short circuit currents.

Current Version: 0.6
Application Date: 2023-07-01

 download TR

 view all documents

Tachometer

General description of the product

Rotational speed indicator of marine diesel engines, steam and gas turbines, which

indicate revolutions per minute and rotating direction.

a) Mechanical (Centrifugal, Electromagnetic) tachometer

The types by drive system are shown below:

- Direct drive;

- Flexible shaft drive;

- Belt drive;

b) Electric tachometer

The types of revolution detectors by drive system are shown below:

- Non-contact type (Detecting system: Frequency);

- Direct type (Detecting system: Frequency, AC voltage or DC voltage);

- Flexible shaft type (Detecting system: AC voltage).

Generally composed of:

- Non-contact type detector (Revolution detector);

- Signal converter; and

- Receiver.

Or:

- Driving unit;

- Direct type/Flexible shaft type detector (Transmitting device);

- Junction box; and

- Receiver.

Current Version: 0.2
Application Date: 2023-07-01

 download TR

 view all documents

new version applicable from
2024-07-01

Temperature Gauges & Transmitters

General description of the product

Temperature gauges, temperature sensors and transmitters.

Gauges and sensors may be based on several working principles: bi-metallic (BM), liquid expansion (LE), gas-expansion (GE), thermo-resistors (RTD), thermocouples (TC), infrared (IR), etc.; the relevant features of which vary accordingly.

Current Version: 0.3
Application Date: 2023-07-01

 download TR

 view all documents

Temperature Switches

General description of the product

Temperature Switches has temperature measurement capabilities with relevant output change-over. Switches may have electric and/or electronic parts and be externally power supplied. Temperature sensors may be based on several working principles: bi-metallic (BM), liquid expansion (LE), gas-expansion (GE), thermo-resistors (RTD), thermocouples (TC), infrared (IR), etc.; the relevant features of which vary accordingly. According their working principle the movement directly act on the opening and closing of an electrical switch or the sensor respond to temperature by changing the electrical performance.

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents

Thermal Insulation of Organic Foams for Piping

General description of the product

These technical requirements apply to thermal insulation of organic foams (hereinafter referred to as 'insulation') used for piping and ventilation ducts penetrating the cargo spaces, mail rooms, baggage rooms and refrigerated compartments of service spaces, as well as for pipe fittings for cold service systems (refrigeration systems and chilled water piping for air-conditioning systems). Insulation can be of the built-up (fabricated in place) or composite design.

Current Version: 0.2
Application Date: 2023-07-01

 download TR

 view all documents

Touch Screen i.e. a Display Monitor or a Video Screen that is also an Input Device

General description of the product

Touch screen i.e. a display monitor or a video screen that is also an input device. The touch screens allow monitoring of and input to systems controlling machinery and equipment.

Current Version: 0.4
Application Date: 2023-07-01

 download TR download TI

 view all documents

Valves - Boiler Water Systems (Class III)

General description of the product

Valves for boiler water systems of Class III piping as defined by IACS UR P2.2 Rev.4 intended to stop or modify water flow in boiler water systems.

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents

new version applicable from
2024-07-01

Valves - Steam Systems

General description of the product

Valves for steam systems of Class III piping as defined by IACS UR P2.2 Rev.4, and for non-essential systems, intended to stop or modify steam flow in steam systems.

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents

new version applicable from
2024-07-01

Valves for Bilge Systems

General description of the product

Valves for bilge systems of Class III piping as defined by IACS UR P2.2 Rev.4 intended to stop or modify bilge water flow.

Current Version: 0.2
Application Date: 2023-07-01

 download TR

 view all documents

new version applicable from
2024-07-01

Valves for Cargo Systems

General description of the product

Valves for cargo systems of Class III piping as defined by IACS UR P2.2 Rev.4 intended to stop or modify a cargo flow.

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents

new version applicable from
2024-07-01

Valves for Freshwater Systems

General description of the product

Valves for freshwater systems of Class III piping as defined by IACS UR P2.2 Rev.4 intended to stop or modify freshwater flow.

Current Version: 0.2
Application Date: 2023-07-01

 download TR

 view all documents

new version applicable from
2024-07-01

Valves for Fuel Oil Systems

General description of the product

Valves for fuel oil systems of Class III piping as defined by IACS UR P2.2 Rev.4 intended to stop or modify fuel oil flow.

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents

new version applicable from
2024-07-01

Valves for Lubricating Oil & Hydraulic Oil Systems

General description of the product

Valves for lubrication oil and hydraulic systems of Class III piping as defined by IACS UR P2.2 Rev.4 intended to stop or modify lubrication oil flow.

Current Version: 0.2
Application Date: 2023-07-01

 download TR

 view all documents

new version applicable from
2024-07-01

Valves for Sanitary Systems

General description of the product

Valves for sanitary systems of Class III piping as defined by IACS UR P2.2 Rev.4 intended to stop or modify a sanitary flow.

Current Version: 0.2
Application Date: 2023-07-01

 download TR

 view all documents

new version applicable from
2024-07-01

Valves for Seawater Systems

General description of the product

Valves for seawater systems of Class III piping as defined by IACS UR P2.2 Rev.4 intended to stop or modify a seawater flow.

Current Version: 0.2
Application Date: 2023-07-01

 download TR

 view all documents

new version applicable from
2024-07-01

Vertical surface reference system for DP system

General description of the product

The vertical surface reference system for DP system is a motion sensor, which can

measure the dynamic linear motion and attitude of the ship, and can measure the

acceleration, roll, pitch, yaw, surge, sway and heave during the ship's operation, and has

high accuracy.

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents

Wind velocity and direction gauge for DP system

General description of the product

Wind sensors (velocity and direction) based on various technologies (e.g. mechanical,

ultrasonic etc).

Note: the wind sensors provide a signal to the system they are installed in. "Gauging"

function is in fact performed by the DP control system, which has not been considered for

MR so far

Current Version: 0.1
Application Date: 2023-07-01

 download TR

 view all documents