M72

M72
M72(Feb2015)(cont)(Corr.1Aug 2015)(Rev.1Mar 2016)(Rev.2Jan 2019)(Rev.3
Apr 2023)

Certification of Engine Components
1.

General

1.1 The engine manufacturer is to have a quality control system that is suitable for theactual engine types to be certified by the Society. The quality control system is also to apply
to any sub-suppliers. The Society reserves the right to review the system or parts thereof.
Materials and components are to be produced in compliance with all the applicableproduction and quality instructions specified by the engine manufacturer. The Society
requires that certain parts are verified and documented by means of Society Certificate (SC),Work Certificate (W) or Test Report (TR).
1.2

Society Certificate (SC)This is a document issued by the Society stating:- conformity with Rule requirements.
- that the tests and inspections have been carried out on:• the finished certified component itself; or• on samples taken from earlier stages in the production of the component, whenapplicable.
- that the inspection and tests were performed in the presence of the Surveyor or inaccordance with special agreements, i.e. Alternative Certification Scheme (ACS).

Note:
1.

The requirements of UR M72 are to be uniformly implemented by IACS Societies toengines with an application for certification dated on or after 1 July 2016.

2.

Rev.1 of this UR is to be uniformly implemented by IACS Societies to engines with anapplication for certification dated on or after 1 July 2017.

3.

Rev.2 of this UR is to be uniformly implemented by IACS Societies to engines with anapplication for certification dated on or after 1 January 2020.

4.

Rev.3 of this UR is to be uniformly implemented by IACS Societies to engines with anapplication for certification dated on or after 1 July 2024.

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M72

M72(cont)

1.3

Work’s Certificate (W)This is a document signed by the manufacturer stating:- conformity with requirements.
- that the tests and inspections have been carried out on:• the finished certified component itself; or• on samples taken from earlier stages in the production of the component, whenapplicable.
- that the tests were witnessed and signed by a qualified representative of the applicabledepartment of the manufacturer.
A Work’s Certificate may be considered equivalent to a Society Certificate and endorsed by
the Society if:- the test was witnessed by the Society Surveyor; or- an ACS agreement is in place between the Class Society and the manufacturer ormaterial supplier; or- the Work’s certificate is supported by tests carried out by an accredited third party thatis accepted by the Society and independent from the manufacturer and/or materialsupplier.
1.4

Test Report (TR)This is a document signed by the manufacturer stating:- conformity with requirements.
- that the tests and inspections have been carried out on samples from the current
Production batch.
1.5 The documents above are used for product documentation as well as for
documentation of single inspections such as crack detection, dimensional check, etc. If
agreed to by the Society, the documentation of single tests and inspections may also bearranged by filling in results on a control sheet following the component through theproduction.
1.6 The Surveyor is to review the TR and W for compliance with the agreed or approved
specifications. SC means that the Surveyor also witnesses the testing, batch or individual,
unless an ACS provides other arrangements.
1.7 The manufacturer is not exempted from responsibility for any relevant tests andinspections of those parts for which documentation is not explicitly requested by the Society.
The manufacturing process and equipment is to be set up and maintained in such a way that
all materials and components can be consistently produced to the required standard. This
includes production and assembly lines, machining units, special tools and devices, assemblyand testing rigs as well as all lifting and transportation devices.

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M72

M72
(cont)

2.

Parts to be documented

2.1 The extent of parts to be documented depends on the type of engine, engine size andcriticality of the part.
2.2 Symbols used are listed in Table M72.1. A summary of the required documentation for
the engine components is listed in Table M72.2.
M72.1 Symbols used in Table M72.2
SymbolCCD
CHDGJL
GJS
GS
M
SCTR
UTW
X

Description
chemical composition
crack detection by MPI or DP
crosshead engines
cylinder bore diameter (mm)gray cast ironspheroidal graphite cast ironcast steelmechanical properties
society certificate
test reportultrasonic testingwork certificate
visual examination of accessible surfaces by the Surveyor

2.3 For components and materials not specified in Table M72.2, consideration will be givenby the Society upon full details being submitted and reviewed.

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M72 Item(cont)M72.2 Summary of required documentation for engine components
Part 4), 5), 6), 7), 8)

Material
properties 1)

Nondestructive
examination 2)

Hydraulictesting 3)

Dimensional
inspection,
includingsurfacecondition

Visualinspection(surveyor)

Applicableto engines:

Component
certificate1

Welded bedplate

W(C+M)

W(UT+CD)

All

SC

2

Bearing transverse
girders GS

fit-up + postwelding

W(C+M)

W(UT+CD)

X

All

SC

3

Welded frame box

W(C+M)

W(UT+CD)

All

SC

45

Cylinder block GJLCylinder block GJS
Welded cylinder
framesEngine block GJLEngine block GJSCylinder liner
Cylinder head GJL
Cylinder head GJSCylinder head GS
Forged cylinder head
Piston crown GS
Forged piston crown

fit-up + postwelding

6
7
8910
11121314
15
1617

Crankshaft: made inone pieceSemi-built Crankshaft(Crankthrow, forgedmain journal andjournals with flange)

W10)
W10)
W(C+M)W(M)
W(C+M)

W(C+M)
W(C+M)
W(C+M)
W(C+M)

W(UT+CD)
W(UT+CD)
W(UT+CD)
W(UT+CD)

SC(C+M)

W(UT+CD)

SC(C+M)

fit-up + postwelding

W(UT+CD)

W(UT+CD)

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W10)
W10)
W10)
W
W
W
W

W

W

X
X
X
X
Random, offillets and oil
bores
Random, offillets andshrink fittings>400 kW/cyl>400 kW/cyl
CH

SC>400 kW/cyl>400 kW/cyl
D>300mm
D>300mm
D>300mm
D>300mm
D>300mm
D>400mm
D>400mmSCSCSCSCAllSCAllSC

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M72

ItemPart 4), 5), 6), 7), 8)

Material
properties 1)(cont)

Nondestructiveexamination 2)

Hydraulictesting 3)

Dimensional
inspection,
includingsurfacecondition

Visualinspection(surveyor)

18

Exhaust gas valve
cage

19

Piston rod

SC(C+M)

W(UT+CD)

Random20

Cross head

SC(C+M)

W(UT+CD)

21

Connecting rod withcap

SC(C+M)

RandomRandom, of all
surfaces, inparticular
those shotpeenedRandom, ofinterference fit

22
23
24
25
26
27
28

29

Coupling bolts forcrankshaft
Bolts and studs formain bearings
Bolts and studs forcylinder heads
Bolts and studs forconnecting rods

W

W(UT+CD)

Applicable
to engines:

CHW

SCSCAllSC

W(C+M)

W(UT+CD)

D>300mm

W(C+M)

W(UT+CD)

D>300mm

W(C+M)

W(UT+CD)

Tie rod

W(C+M)

W(UT+CD)

High pressure fuelinjection pump bodyHigh pressure fuelinjection valves (onlyfor those notautofretted)
High pressure fuelinjection pipes
including common
fuel rail

W(C+M)
W(C+M)

TR of thread
makingTR of threadmaking

SC

All

W(UT+CD)

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W

D>400mmCHCHSC(C+M)

W(C+M)

Component
certificate

D>300mm
Random

CHW
TR

D>300mm
D≤300mm

W

D>300mm

TR

D≤300mm

W for
those thatare not
autofretted

D>300mmSC

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M72

M72

ItemPart 4), 5), 6), 7), 8)

Material
properties 1)(cont)

Nondestructive
examination 2)

Hydraulictesting 3)

Dimensional
inspection,including
surfacecondition

Visualinspection(surveyor)

Applicable
to engines:

W(C+M)

TR forthose thatare not
autofretted

High pressurecommon servo oilsystem

W(C+M)

W

D>300mm

W(C+M)

TRD≤300mm

31

Cooler, both sides 9)W(C+M)

W32

Accumulator

W(C+M)

W

D>300mm
All engines
withaccumulatorswith acapacity of>0,5 l

W(C+M)

W>800 kW/cyl

W>800 kW/cyl30333435

Piping, pumps,
actuators, etc. forhydraulic drive ofvalves, if applicableEngine driven pumps(oil, water, fuel, bilge)
other than pumpsreferred to in item 27
and 33
Bearings for main,crosshead, andcrankpin

TR(C)TR (UT for fullcontact between
base material
and bearingmetal)

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Component
certificate

D≤300mm

W>800 kW/cyl

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M72(cont)FOOTNOTES:
1.

Material properties include chemical composition and mechanical properties, and alsosurface treatment such as surface hardening (hardness, depth and extent), peeningand rolling (extent and applied force).

2.

Non-destructive examination means e.g., ultrasonic testing, crack detection by MPI or
DP. When certain NDE method on the finished component is impractical (for example
UT for items 12/13), the NDE method can be performed at earlier appropriate stages in
the production of the component, see M72.1.2.

3.

Hydraulic testing is applied on the water/oil side of the component. Items are to betested by hydraulic pressure at the pressure equal to 1.5 times the maximum working
pressure. High pressure parts of the fuel injection system are to be tested by hydraulicpressure at the pressure equal to 1.5 maximum working pressure or maximum working
pressure plus 300 bar, whichever is the less. Where design or testing features may
require modification of these test requirements, special consideration may be given.

4.

Material certification requirements for pumps and piping components are dependent onthe operating pressure and temperature. Requirements given in this Table apply except
where alternative requirements are explicitly given elsewhere in the IACS URs.

5.

For turbochargers, see M73.

6.

Crankcase explosion relief valves are to be type tested in accordance with M66 anddocumented according to M9.

7.

Oil mist detection systems are to be type tested in accordance with M67 anddocumented according to M10.

8.

For speed governor and overspeed protective devices, see M3.

9.

Charge air coolers need only be tested on the water side.

10.

Hydraulic testing is also required for those parts filled with cooling water and having thefunction of containing the water which is in contact with the cylinder or cylinder liner.
End ofDocument

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