Fire Code of the Philippines Ebook - SafetySignsPH.com Fire Code of the Philippines eBook - SafetySignsPH | Page 306

b. Metallic containers shall be built, inspected and tested in
accordance with applicable provisions of the PSME Code for
Design and Construction of Large, Welded, Low-Pressure Storage
Tanks, depending on the temperature and pressure of the product
stored.
c. Concrete containers shall be built in accordance with the
applicable provisions of the National Building Code.
Barrier
materials used in connection with concrete but not functioning
structurally shall be made of materials authorized by the PSME
Unfired Pressure Vessel Code.
d. Pressurized containers shall be protected by a pressure-relieving
device or devices. If only one pressure relief device is used, it shall
be set to operate a pressure not to exceed the Maximum
Allowable Working Pressure (MAWP). Additional relief devices may
be set to operate at a higher pressure but shall not exceed one
hundred ten percent (110%) of the MAWP.
i.
Containers that may be subjected to an exposure to fire
hazards shall be protected by pressure relieving devices
designed to protect against excessive pressure caused by such
exposures. Such devices shall be set to operate at a pressure
not in excess of one hundred ten percent (110%) of the MAWP,
and shall have a relieving capacity sufficient to prevent the
pressure from rising more than twenty percent (20%) above the
MAWP. If only one device is used, it shall be set to operate at a
pressure not to exceed the MAWP.
ii. Relief devices shall be located so that they are readily
accessible for inspection and repair and shall be protected
against tampering. All relief devices shall be so designed or
located to prevent accumulation of moisture and freezing
which would interfere with the proper operation of the device.
iii. No shutoff valves shall be installed between relief valves and
container except that shutoff valves may be used on multiple
valve installations where the arrangement of the valves will
provide the required flow through the relief devices at all times.
iv. Outer containers shall be equipped with pressure and vacuum
relief devices or rupture discs to adequately protect the
container.
v. Heat exchangers and similar vessels shall be protected with a
relieving device of sufficient capacity to avoid pressure in case
of an internal failure.
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