Section
5 Plastic pipes
5.1 General
5.1.1 Proposals to use plastic pipes in shipboard piping systems will be considered in
relation to the properties of the materials, the operating conditions, the intended
service and location. Details are to be submitted for approval. Special consideration
will be given to any proposed service for plastic pipes not mentioned in these Rules.
5.1.2 Plastic pipes and fittings will, in general, be accepted in Class III piping
systems. Proposals for the use of plastic in Class I and Class II piping systems will be
specially considered.
5.1.3 For Class I, Class II and any Class III piping systems for which there are Rule
requirements, the pipes are to be of a type which has been approved by LR.
5.1.5 The use of plastic pipes may be restricted by statutory requirements of the National
Authority of the country in which the vessel is to be registered.
5.2 Design and performance criteria
5.2.1 Pipes and fittings are to be of robust construction and are to comply with an
acceptable National or International standard, consistent with the intended use.
Particulars of pipes, fittings and joints are to be submitted for consideration.
5.2.2 The design and performance criteria of all piping systems, independent of
service or location, are to meet the requirements of Pt 5, Ch 12, 5.3 Design strength.
5.2.3 Depending on the service and location, the fire safety aspects, such as
fire endurance, flame spread, smoke generation, toxicity and fire protection coatings,
are to meet the requirements of Pt 5, Ch 12, 5.4 Fire performance criteria and Pt 5, Ch 12, 5.5 Additional fire performance criteria applicable to ships.
5.2.4 Plastic piping, connections and fittings are to be electrically conductive when:
- carrying fluids capable of generating electrostatic charges;
or
- passing through hazardous zones and spaces, regardless of the
fluid being conveyed.
Suitable precautions against the build-up of electrostatic charges are to
be provided in accordance with the requirements of Pt 5, Ch 12, 5.6 Electrical conductivity.
5.3 Design strength
5.3.1 The strength of pipes is to be determined by hydrostatic pressure tests to failure on
representative sizes of pipe. The strength of fittings is to be not less than the
strength of the pipes.
5.3.2 The nominal internal pressure, pNi, of the pipe is to be determined
by the lesser of the following:
pNi ≤ pst/ 2,5
pNi ≤ plt/4
where
pst |
= |
short term hydrostatic test failure pressure, in MPa |
plt |
= |
long term hydrostatic test failure pressure (100 000 hours), in
MPa |
Failure pressures obtained over a reduced period and extrapolated in accordance with a
recognised National or International Standard will be specially considered.
5.3.3 In service, the pipe is not to be subjected to a pressure greater than
pNi.
5.3.4 The nominal external pressure, pNe, of the pipe, defined
as the maximum total of internal vacuum and external static pressure head to which the
pipe may be subjected, is to be determined by the following:
where
pcol |
= |
pipe collapse pressure, in MPa |
5.3.5 pcol is not to be less than 0,3 MPa.
5.3.8 Where it is proposed to use plastic piping in low temperature services, design strength
testing is to be made at a temperature 10°C lower than the minimum working
temperature.
5.3.9 The selection of plastic materials for piping is to take account of other factors such
as impact resistance, ageing, fatigue, erosion resistance, fluid absorption and material
compatibility such that the design strength of the piping is not reduced below that
required by these Rules.
5.3.10 Design strength values may be verified experimentally or by a combination of testing and
calculation methods.
5.4 Fire performance criteria
5.4.1 Where a fire protective coating of pipes and fittings is necessary for achieving the
fire endurance standards required, the coating is to be resistant to products likely to
come into contact with the piping and be suitable for the intended application.
5.4.2 The materials used for plastic pipes, except those fitted on open decks and within
tanks, cofferdams, void spaces, pipe tunnels and ducts are to have low flame spread
characteristics.
5.4.3 The materials used for plastic pipes within accommodation, service and control spaces
are not to be capable of producing excessive quantities of smoke and toxic products that
may be a hazard to personnel within those spaces.
5.5 Additional fire performance criteria
applicable to ships
5.5.1 Where plastic pipes are used in systems essential to the safe operation
of the vessel, or for containing combustible liquids or sea water where leakage or
failure could result in fire or in the flooding of watertight compartments, the
pipes and fittings, including couplings with flexible internal seals, are to be of a
type which has been fire endurance tested in accordance with the requirements of
Table 12.5.1 Fire endurance requirements.
Table 12.5.1 Fire endurance requirements
|
Location
|
|
A
|
B
|
C
|
D
|
E
|
F
|
G
|
H
|
I
|
J
|
K
|
CARGO (FLAMMABLE CARGOES f.p. ≤
60°C)
|
1 Cargo lines
|
N/A
|
N/A
|
L1
|
N/A
|
N/A
|
0
|
N/A
|
010
|
0
|
N/A
|
L12
|
2 Crude oil washing lines
|
N/A
|
N/A
|
L1
|
N/A
|
N/A
|
0
|
N/A
|
010
|
0
|
N/A
|
L12
|
3 Vent lines
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
0
|
N/A
|
010
|
0
|
N/A
|
X
|
INERT GAS
|
4 Water seal effluent line
|
N/A
|
N/A
|
01
|
N/A
|
N/A
|
01
|
01
|
01
|
01
|
N/A
|
0
|
5 Scrubber effluent line
|
01
|
01
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
01
|
01
|
N/A
|
0
|
6 Main line
|
0
|
0
|
L1
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
0
|
N/A
|
L16
|
7 Distribution lines
|
N/A
|
N/A
|
L1
|
N/A
|
N/A
|
0
|
N/A
|
N/A
|
0
|
N/A
|
L12
|
FLAMMABLE LIQUIDS (f.p. >
60°C)
|
8 Cargo lines
|
X
|
X
|
L1
|
X
|
X
|
N/A3
|
0
|
010
|
0
|
N/A
|
L1
|
9 Fuel oil
|
X
|
X
|
L1
|
X
|
X
|
N/A3
|
0
|
0
|
0
|
L1
|
L1
|
10 Lubricating oil
|
X
|
X
|
L1
|
X
|
X
|
N/A
|
N/A
|
N/A
|
0
|
L1
|
L1
|
11 Hydraulic oil
|
X
|
X
|
L1
|
X
|
X
|
0
|
0
|
0
|
0
|
L1
|
L1
|
SEA WATER 1
|
12 Bilge main and branches
|
L17
|
L17
|
L1
|
X
|
X
|
N/A
|
0
|
0
|
0
|
N/A
|
L1
|
13 Fire main and water spray
|
L1
|
L1
|
L1
|
X
|
N/A
|
N/A
|
N/A
|
0
|
0
|
X
|
L1
|
14 Foam system
|
L1W
|
L1W
|
L1W
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
0
|
L1W
|
L1W
|
15 Sprinkler system
|
L1W
|
L1W
|
L3
|
X
|
N/A
|
N/A
|
N/A
|
0
|
0
|
L3
|
L3
|
16 Ballast
|
L3
|
L3
|
L3
|
L3
|
X
|
010
|
0
|
0
|
0
|
L2
|
L2
|
17 Cooling water, essential
services
|
L3
|
L3
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
0
|
0
|
N/A
|
L2W
|
18 Tank cleaning services fixed
machines
|
N/A
|
N/A
|
L3
|
N/A
|
N/A
|
0
|
N/A
|
0
|
0
|
N/A
|
L32
|
19 Non-essential systems
|
0
|
0
|
0
|
0
|
0
|
N/A
|
0
|
0
|
0
|
0
|
0
|
FRESH WATER
|
20 Cooling water essential
services
|
L3
|
L3
|
N/A
|
N/A
|
N/A
|
N/A
|
0
|
0
|
0
|
L3
|
L3
|
21 Condensate return
|
L3
|
L3
|
L3
|
0
|
0
|
N/A
|
N/A
|
N/A
|
0
|
0
|
0
|
22 Non-essential systems
|
0
|
0
|
0
|
0
|
0
|
N/A
|
0
|
0
|
0
|
0
|
0
|
SANITARY/DRAINS/SCUPPERS
|
23 Deck drains (internal)
|
L1W4
|
L1W4
|
N/A
|
L1W
|
0
|
N/A
|
0
|
0
|
0
|
0
|
0
|
24 Sanitary drains (internal)
|
0
|
0
|
N/A
|
0
|
0
|
N/A
|
0
|
0
|
0
|
0
|
0
|
25 Scuppers and discharges
(overboard)
|
01,8
|
01,8
|
01,8
|
01,8
|
01,8
|
0
|
0
|
0
|
0
|
01,8
|
0
|
SOUNDING/AIR
|
26 Water tanks/dry spaces
|
0
|
0
|
0
|
0
|
0
|
010
|
0
|
0
|
0
|
0
|
011
|
27 Oil tanks (f.p. > 60°C)
|
X
|
X
|
X
|
X
|
X
|
X3
|
0
|
010
|
0
|
X
|
X
|
ENGINE EXHAUSTS
|
28 Main line
|
01
|
01
|
N/A
|
N/A
|
01
|
N/A
|
N/A
|
N/A
|
01
|
N/A
|
L1
|
29 Drain line
|
01
|
01
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
MISCELLANEOUS
|
30 Control air
|
L15
|
L15
|
L15
|
L15
|
L15
|
N/A
|
0
|
0
|
0
|
L15
|
L15
|
31 Service air (non-essential)
|
0
|
0
|
0
|
0
|
0
|
N/A
|
0
|
0
|
0
|
0
|
0
|
32 Brine
|
0
|
0
|
N/A
|
0
|
0
|
N/A
|
N/A
|
N/A
|
0
|
0
|
0
|
31 Auxiliary low pressure steam
(≤ 0,7 MPa)
|
L2W
|
L2W
|
09
|
09
|
09
|
0
|
0
|
0
|
0
|
09
|
09
|
NEW SERVICES
|
32 Central vacuum
cleaners
|
N/A
|
N/A
|
N/A
|
0
|
N/A
|
N/A
|
N/A
|
N/A
|
0
|
0
|
0
|
33 Exhaust gas cleaning system
effluent line
|
L31
|
L31
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
L31,11/N/A
|
N/A
|
34 Urea transfer/supply system
(SCR installations)
|
L112
|
L112
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
0
|
L31,11/N/A
|
N/A
|
LOCATION DEFINITIONS
|
Location
|
Definition
|
A
|
Machinery spaces of Category
A
|
Machinery spaces of Category A as
defined in SOLAS - International Convention for the Safety of Life at Sea
Chapter II-2 - Construction - Fire protection, fire detection and fire extinction/3.19.
|
B
|
Other machinery spaces and pump
rooms
|
Spaces, other than Category A
machinery spaces and cargo pump rooms, containing propulsion
machinery, boilers, steam and internal combustion engines,
generators and major electrical machinery, pumps, oil filling
stations, refrigerating, stabilising, ventilation and
air-conditioning machinery, and similar spaces, and trunks to such
spaces.
|
C
|
Cargo pump rooms
|
Spaces containing cargo pumps and
entrances and trunks to such spaces.
|
D
|
Ro-Ro cargo holds
|
Ro-Ro cargo holds are Ro-Ro cargo
spaces and special category spaces as defined in SOLAS - International Convention for the Safety of Life at SeaChapter II-2 - Construction - Fire protection, fire detection and fire extinction/3.14 and
SOLAS - International Convention for the Safety of Life at SeaChapter II-2 - Construction - Fire protection, fire detection and fire extinction/3.18.
|
E
|
Other dry cargo holds
|
All spaces other than Ro-Ro cargo
holds used for non-liquid cargo and trunks to such spaces.
|
F
|
Cargo tanks
|
All spaces used for liquid cargo
and trunks to such spaces.
|
G
|
Fuel oil tanks
|
All spaces used for fuel oil
(excluding cargo tanks) and trunks to such spaces.
|
H
|
Ballast water tanks
|
All spaces used for ballast water
and trunks to such spaces.
|
I
|
Cofferdams, voids, etc.
|
Cofferdams and voids are those
empty spaces between two bulkheads separating two adjacent
compartments.
|
J
|
Accommodation, service
|
Accommodation spaces, service
spaces and control stations as defined in SOLAS - International Convention for the Safety of Life at SeaChapter II-2 - Construction - Fire protection, fire detection and fire extinction/3.10, SOLAS - International Convention for the Safety of Life at Sea
Chapter II-2 - Construction - Fire protection, fire detection and fire extinction/3.12 and SOLAS - International Convention for the Safety of Life at Sea
Chapter II-2 - Construction - Fire protection, fire detection and fire extinction/3.22.
|
K
|
Open decks
|
Open deck spaces, as defined in
SOLAS - International Convention for the Safety of Life at Sea
Chapter II-2 - Construction - Fire protection, fire detection and fire extinction/26.2.2(5).
|
ABBREVIATIONS
|
L1
|
Level 1. Piping having passed the
fire endurance test specified in Appendix 1 of IMO Resolution A.753(18) - Guidelines for the Application of Plastic Pipes on Ships - (adopted on 4 November 1993)Amended
by Resolution MSC.313(88), as
amended by Resolution MSC.313(88) – Amendments to the Guidelines for the Application of Plastic Pipes on Ships (Resolution A.753(18))
– (Adopted on 26 November 2010) and
Resolution MSC.399(95) - Amendments to the Guidelines for the Application of Plastic Pipes on Ships (Resolution A.753(18)),
as amended by Resolution MSC.313(88) - (Adopted on 5 June 2015) for a
duration of a minimum of one hour without loss of integrity in the
dry condition is considered to meet level 1 fire endurance standard
(L1). Level 1W –Piping systems similar to Level 1 systems except
these systems do not carry flammable fluid or any gas and a maximum
5% flow loss in the system after exposure is acceptable
(L1W).
|
L2
|
FLevel 2. Piping having passed
the fire endurance test specified in Appendix 1 of IMO Resolution A.753(18) - Guidelines for the Application of Plastic Pipes on Ships - (adopted on 4 November 1993)Amended
by Resolution MSC.313(88), as
amended by Resolution MSC.313(88) – Amendments to the Guidelines for the Application of Plastic Pipes on Ships (Resolution A.753(18))
– (Adopted on 26 November 2010) and
Resolution MSC.399(95) - Amendments to the Guidelines for the Application of Plastic Pipes on Ships (Resolution A.753(18)),
as amended by Resolution MSC.313(88) - (Adopted on 5 June 2015) for a
duration of a minimum of 30 minutes in the dry condition is
considered to meet level 2 fire endurance standard (L2). Level 2W –
Piping systems similar to Level 2 systems except a maximum 5% flow
loss in the system after exposure is acceptable (L2W).
|
L3
|
Fire endurance test in wet
conditions, 30 minutes, IMO Resolution A.753(18) - Guidelines for the Application of Plastic Pipes on Ships - (adopted on 4 November 1993)Amended
by Resolution MSC.313(88)
Appendix 2 - Test Method for Fire Endurance Testing of Water-Filled Plastic Piping.
|
0
|
No fire endurance test
required.
|
N/A
|
Not applicable.
|
X
|
Metallic materials having a
melting point greater than 925°C.
|
Note 1. Where
non-metallic piping is used, remotely controlled valves are to
be provided at vessel's side (valve is to be controlled from
outside space).
|
Note 2.
Remote closing valves are to be provided at the cargo tanks.
|
Note 3. When
cargo tanks contain flammable liquids with f.p. > 60°C, ‘0’
may replace ‘N/A’ or ‘X’.
|
Note 4. For
drains serving only the space concerned, ‘0’ may replace ‘L1W’.
|
Note 5. When
controlling functions are not required by the Rules or statutory
requirements, ‘0’ may replace ‘L1’.
|
Note 6. For
pipes between machinery space and deck water seal, ‘0’ may
replace ‘L1’.
|
Note 7. For
passenger vessels, ‘X’ is to replace ‘L1’.
|
|
Note 9. For
essential services, ‘X’ is to replace ‘0’.
|
|
Note 12. Type Approved plastic piping without fire endurance test
(0) is acceptable downstream of the tank valve, provided this
valve is metal seated and arranged as fail-to-closed or with
quick closing from a safe position outside the space in the
event of fire.
|
5.6 Electrical conductivity
5.6.1 Where a piping system is required to be electrically conductive for the control of
static electricity, the resistance per unit length of the pipe, bends, elbows,
fabricated branch pieces, etc. is not to exceed 0,1 MΩ/m.
5.6.2 Where a piping system is required to be electrically conductive for the control of
static electricity, electrical continuity is to be maintained across the joints and
fittings and the system is to be earthed. The resistance to earth from any point in the
piping system is not to exceed 1 MΩ. See also
Pt 6, Ch 2, 1.13 Bonding for the control of static electricity.
5.7 Manufacture and quality control
5.7.1 All materials for plastic pipes and fittings are to be approved by LR, and
are in general to be tested in accordance with Ch 14, 4 Plastic pipes and fittings of the Rules for the Manufacture, Testing and Certification of Materials, July 2022. For pipes and fittings not employing hand lay up techniques, the hydrostatic
pressure test required by Ch 14, 4.9 Hydraulic test of the Rules for the Manufacture, Testing and Certification of Materials, July 2022
may be replaced by testing carried out in accordance with the requirements stipulated in
a recognised National or International Standard, consistent with the intended use for
which the pipe or fittings are manufactured, provided that there is an effective quality
system in place complying with the requirements of Ch 14, 4.4 Quality assurance of the Rules for the Manufacture, Testing and Certification of Materials, July 2022
and the testing is completed to the satisfaction of the LR Surveyor.
5.7.2 The material manufacturer’s test certificate, based on actual tested data, is to be
provided for each batch of material.
5.7.3 Plastic pipes and fittings are to be manufactured at a works approved by LR in
accordance with agreed quality control procedures which shall be capable of detecting at
any stage (e.g. incoming material, production, finished article, etc.) deviations in the
material, product or process.
5.8 Construction and installation
5.8.1 All pipes are to be adequately but freely supported. Suitable provision is to be made
for expansion and contraction to take place without unduly straining the pipes.
5.8.2 Pipes may be joined by mechanical couplings or by bonding methods such as welding,
laminating and adhesive bonding.
5.8.3 Where bonding systems are used, the manufacturer or installer shall provide a written
procedure covering all aspects of installation, including temperature and humidity
conditions. The bonding procedure is to be approved by LR.
5.8.4 The person carrying out the bonding is to be qualified. Records are to be available to
the Surveyor for each qualified person showing the bonding procedure and performance
qualification, together with dates and results of the qualification testing.
5.8.5 Conditions during installation, such as temperature and humidity, which may affect the
strength of the finished joints, are to be in accordance with the agreed bonding
procedure.
5.8.6 The required fire endurance level of the pipe is to be maintained in way of pipe
supports, joints and fittings, including those between plastic and metallic pipes.
5.8.7 Where piping systems are arranged to pass through watertight bulkheads or
decks, provision is to be made for maintaining the integrity of the bulkhead or deck by
means of metallic bulkhead or deck pieces. The bulkhead or deck pieces are to be of
substantial construction and suitably protected against corrosion and so constructed to
be of a strength equivalent to the intact bulkhead; attention is drawn to Pt 5, Ch 12, 5.8 Construction and installation 5.8.1, details of
the arrangements are to be submitted for approval.
5.8.8 Pipes or other fittings attached directly to the plating of tanks and to bulkheads,
which are required to be of watertight construction, are to be secured by means of studs
screwed through the plating or by tap bolts, and not by bolts passing through clearance
holes. Alternatively, the studs or the bulkhead or tank pieces may be welded to the
plating.
5.9 Additional requirements for testing plastic
pipes for ships
5.9.3 In the case of pipes intended for essential services each qualified person is, at the
place of construction, to make at least one test joint, representative of each type of
joint to be used. The joined pipe section is to be tested to an internal hydrostatic
pressure of four times the design pressure of the pipe system and the pressure held for
not less than one hour, with no leakage or separation of joints. The bonding procedure
test is to be witnessed by the Surveyor.
|