Part
Chapter
Section
4
6
2
7.3.2
Vessel Systems and Machinery
Piping Systems
Metallic Piping
4-6-2
Hydrostatic Tests of Shell Valves (1 July 2018)
All valves intended for installation on the side shell at or below the deepest load waterline, including
those at the sea chests, are to be hydrostatically tested in the presence of the Surveyor, before
installation.
of not to be less than test pressure
The valve housingg of each valve is to be subjected
j
to a pressure
p
of 5 bar (5.1 kgf/cm2, 72.5 psi). No leakage is permitted and holding time as follows:
x
15 seconds for sizes up to 50 mm (2 inch)
x
60 seconds for sizes 75 mm - 150 mm (2.5 inch - 6 inch)
x
120 seconds for sizes 200 mm - 300 mm (8 inch - 12 inch)
x
300 seconds for sizes 350 m
mm (14 inch) and larger
The valve assembly is to be subjected to a hydrostatic seat leakage test. The test is to be performed
with closed valve with the other end open to atmosphere. The pressure is to be applied independently
on each side. Test pressure is not to be less than 5 bar (5.1 kgf/cm2, 72.5 psi). Holding time is
5 minutes for all sizes.
7.3.3
Tests After Installation
7.3.3(a) General. All piping systems are to be tested in the presence of the Surveyor under
working conditions after installation and checked for leakage. Where necessary, other techniques
of tightness test in lieu of a working pressure test may be considered.
7.3.3(b) Specific Systems. The following piping systems are to be hydrostatically tested in the
presence of the Surveyor after installation to 1.5P, but not less than 4 bar (4.1 kgf/cm2, 58 psi).
x
Gas and liquid fuel systems
x
Heating coils in tanks
For cargo oil, liquefied gas, and chemical cargo and associated piping, see 5C-1-7/3.3.5, 5C-8-5/13.2.2
and 5C-9-5/4.2 respectively.
7.3.4
Pneumatic Tests in Lieu of Hydrostatic Tests (1 July 2012)
In general, pneumatic tests in lieu of hydrostatic test are not permitted. Where it is impractical to
carry out the required hydrostatic tests, pneumatic tests may be considered. In such cases, the procedure
for carrying out the pneumatic test, having regard to safety of personnel, is to be submitted to the
applicable ABS Assistant Chief Surveyor for special consideration.
7.5
Resistance Testing
Piping required by 4-6-2/9.15 to be electrically earthed (grounded) to the hull are to be checked in the
presence of the Surveyor to ensure that the resistance from any point along the piping to the hull does not
exceed 1 M:. Where bonding straps are used, they are to be located in visible locations.
9
Installation Details
9.1
Protection from Mechanical Damage
All piping located in a position where it is liable to mechanical damage is to be protected. The protective
arrangements are to be capable of being removed to enable inspection.
9.3
Protection of Electrical Equipment
The routing of pipes in the vicinity of switchboards and other electrical equipment is to be avoided as far
as possible. When such a routing is necessary, care is to be taken to ensure that no flanges or joints are
installed over or near the equipment unless provisions are made to prevent any leakage from damaging the
equipment or creating a hazard for personnel.
454
ABS RULES FOR BUILDING AND CLASSING STEEL VESSELS . 2019