Volume 13 Number 1 - University of the Philippines College of Law

January - March 2002 National Administrative Register 287
(2) Where safety rupture discs are used for additional protection of pressure vessels,
they shall be designed to fail at a pressure above the safety valve setting.
1172.09 : Identification of Control Valves :
Where a battery of pressure vessels is operated, control valves shall be plainly marked
by numbering or by the use of a distinctive color system. If the valve is located on the vessel,
each vessel shall carry a mark corresponding to that on its valve.
1172.10 : Indicating and Recording Devices :
Indicating and recording devices on pressure vessels shall be protected against breakage
or clogging and clearly legible to the operators.
1172.11 : Inspection:
Inspection proceedings for Pressure Vessels shall be the same as provided under Rule
1162.02.
1173 : Liquefied Petroleum Gas (LPG) Vessels and other Cylinders:
(1) Vessels containing or are used as containers for liquefied petroleum gas (LPG),
chemicals, catalyst and other corrosive gases shall be subjected to internal and/or external
inspection, including hydrostatic tests equal to 1.2 times the maximum working pressure at
intervals not exceeding two (2) years in the case of cylinders for corrosive gases and five
(5) years for other gas cylinders. However, internal inspection shall be conducted on such a
vessel at any time within this period if in the opinion of the competent authority, said inspection
is deemed necessary due to known or inspected defects.
(2) The result of the internal and/or external conduct of inspection on all pressure vessel
parts and appliances, may upon the discretionary power/privilege of the inspection authority,
decide whether or not to subject the pressure vessel to a hydrostatic test
(3) In lieu of hydrostatic test, radiographic, ultrasonic thickness gauging, magnetic particle,
liquid penetrant and/or other equivalent non-destructive test shall be performed on such
vessel.
1173.01: Cylinder Records :
Every cylinder owner/user or person responsible for the maintenance of the cylinder shall
keep a cylinder maintenance logbook/register which shall show the corresponding dates of
all tests, internal and/or external inspection, cleaning and repairs undertaken. Such logbook/
register shall be made available upon request by the inspection authority.
1173.02 : Fittings :
(1) Every cylinder shall be provided with a device that prevents damage to the bottom of
the gas cylinder;
(2) Only materials resistant to the contents of the cylinder shall be used for parts of valves
and fittings.