Page 427 - 2018_IFC

CRYOGENIC FLUIDS

5503.1.3.1 Temperature effects. Where container 5503.3 Pressure relief vent piping. Pressure relief vent-pip-
foundations or supports are subject to exposure to tem- ing systems shall be constructed and arranged so as to remain
peratures below -130°F (-90°C), the foundations or functional and direct the flow of gas to a safe location in
supports shall be constructed of materials to withstand accordance with Sections 5503.3.1 and 5503.3.2.
the low-temperature effects of cryogenic fluid spillage.
5503.3.1 Sizing. Pressure relief device vent piping shall
5503.1.3.2 Corrosion protection. Portions of contain- have a cross-sectional area not less than that of the pres-
ers in contact with foundations or saddles shall be sure relief device vent opening and shall be arranged so as
painted to protect against corrosion. not to restrict the flow of escaping gas.
5503.2 Pressure relief devices. Pressure relief devices shall 5503.3.2 Arrangement. Pressure relief device vent piping
be provided in accordance with Sections 5503.2.1 through and drains in vent lines shall be arranged so that escaping
5503.2.7 to protect containers and systems containing cryo- gas will discharge unobstructed to the open air and not
genic fluids from rupture in the event of overpressure. Pres- impinge on personnel, containers, equipment and adjacent
sure relief devices shall be designed in accordance with CGA structures or enter enclosed spaces. Pressure relief device
S-1.1, CGA S-1.2 and CGA S-1.3. vent lines shall be installed in such a manner to exclude or
5503.2.1 Containers. Containers shall be provided with remove moisture and condensation and prevent malfunc-
pressure relief devices. tion of the pressure relief device because of freezing or ice
accumulation.
5503.2.2 Vessels or equipment other than containers.
Heat exchangers, vaporizers, insulation casings surround- 5503.4 Marking. Cryogenic containers and systems shall be
ing containers, vessels and coaxial piping systems in marked in accordance with Sections 5503.4.1 through
which liquefied cryogenic fluids could be trapped because 5503.4.6.
of leakage from the primary container shall be provided 5503.4.1 Identification signs. Visible hazard identifica-
with a pressure relief device. tion signs in accordance with NFPA 704 shall be provided
5503.2.3 Sizing. Pressure relief devices shall be sized in at entrances to buildings or areas in which cryogenic fluids
accordance with the specifications to which the container are stored, handled or used.
was fabricated. The relief device shall have sufficient 5503.4.2 Identification of contents. Stationary and porta-
capacity to prevent the maximum design pressure of the ble containers shall be marked with the name of the gas
container or system from being exceeded. contained. Stationary above-ground containers shall be
5503.2.4 Accessibility. Pressure relief devices shall be placarded in accordance with Sections 5003.5 and 5003.6.
located such that they are provided with ready access for Portable containers shall be identified in accordance with
inspection and repair. CGA C-7.
5503.2.5 Arrangement. Pressure relief devices shall be 5503.4.3 Identification of containers. Stationary contain-
arranged to discharge unobstructed to the open air in such ers shall be identified with the manufacturing specification
a manner as to prevent impingement of escaping gas on and maximum allowable working pressure with a perma-
personnel, containers, equipment and adjacent structures nent nameplate. The nameplate shall be installed on the
or to enter enclosed spaces. container in a location provided with ready access. The
nameplate shall be marked in accordance with the ASME
Exception: DOTn-specified containers with an internal Boiler and Pressure Vessel Code or DOTn 49 CFR Parts
3
volume of 2 cubic feet (0.057 m ) or less.
100-185.
5503.2.6 Shutoffs between pressure relief devices and 5503.4.4 Identification of container connections. Con-
containers. Shutoff valves shall not be installed between tainer inlet and outlet connections, liquid-level limit con-
pressure relief devices and containers.
trols, valves and pressure gauges shall be identified with
Exceptions: one of the following:
1. A shutoff valve is allowed on containers 1. A permanent tag or label identifying the function.
equipped with multiple pressure relief device 2. A schematic drawing that portrays the function and
installations where the arrangement of the valves designates whether the connection is to the vapor or
provides the full required flow through the mini- liquid space of the container.
mum number of required relief devices at all
times. Where a schematic drawing is provided, it shall be
attached to the container and maintained in a legible con-
2. A locking-type shutoff valve is allowed to be dition.
used upstream of the pressure relief device for
service-related work performed by the supplier 5503.4.5 Identification of piping systems. Piping sys-
when in accordance with the requirements of the tems shall be identified in accordance with ASME A13.1.
ASME Boiler and Pressure Vessel Code. 5503.4.6 Identification of emergency shutoff valves.
5503.2.7 Temperature limits. Pressure relief devices Emergency shutoff valves shall be identified and the loca-
shall not be subjected to cryogenic fluid temperatures tion shall be clearly visible and indicated by means of a
except when operating. sign.

394 2018 INTERNATIONAL FIRE CODE ®
Copyrighted © 2017 by, or licensed to, ICC (ALL RIGHTS RESERVED); licensed to UL, LLC pursuant to License Agreement with ICC. No further reproductions authorized or distribution authorized.
ANY UNAUTHROIZED REPRODUCTION OR DISTRIBUTION IS A VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT; AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER.