Wash. Admin. Code § 296-24-93003 - General requirements
(1)
Application. You must ensure that compressed gas cylinder,
portable tanks, and cargo tanks shall have pressure relief devices installed
and maintained in accordance with Compressed Gas Association Pamphlets
S-1.1-1963 and 1965 addenda and S-1.2-1963.
(2)Types of safety relief
devices. Types of safety relief devices as covered by this section are
designated as follows:
(a) Type CG-1:
Frangible disc .
(b) Type CG-2:
Fusible plug or reinforced fusible plug utilizing a fusible alloy with yield
temperature not over 170°F, nor less than 157°F (165°F
nominal).
(c) Type CG-3: Fusible
plug or reinforced fusible plug utilizing a fusible alloy with yield
temperature not over 220°F, nor less than 208°F (212°F
nominal).
(d) Type CG-4:
Combination frangible disc-fusible plug , utilizing a fusible alloy with yield
temperature not over 170°F, nor less than 157°F (165°F
nominal).
(e) Type CG-5:
Combination frangible disc-fusible plug , utilizing a fusible alloy with yield
temperature not over 220°F, nor less than 208°F (212°F
nominal).
(f) Type CG-7: Safety
relief valve .
(g)Type CG-8:
Combination safety relief valve and fusible plug .
(3)
Specifications and tests.
All safety relief devices covered by this section must meet the design,
construction, marking and test specification of the "Compressed Gas Association
Safety Relief Device Standards Part 1-Cyl-inders for Compressed Gases:
S1.1-1963."
(4)Specific
requirements for safety relief devices.
(a) Compressed gas cylinders, which under the
regulations of the department of transportation must be equipped with safety
relief devices, must be considered acceptable when equipped with devices of
proper construction, location, and discharge capacity under the conditions
prescribed in Table 1 of the Compressed Gas Associations Standard
S-1.1-1963.
(b) You must only use
replacement parts or assemblies provided by the manufacturer unless the
advisability of interchange is proved by adequate tests.
(c) When a frangible disc is used with a
compressed gas cylinder, the rated bursting pressure of the disc must not
exceed the minimum required test pressure of the cylinder with which the device
is used, except for DOT -3E cylinders (49 C.F.R. Ch. 1) the rated bursting
pressure of the device must not exceed 4,500 pounds per square inch gage
(p.s.i.g.).
(d) When a safety
relief valve is used on a compressed gas cylinder, the flow rating pressure
must not exceed the minimum required test pressure of the cylinder on which the
safety relief valve is installed and the reseating pressure must not be less
than the pressure in a normally charged cylinder at 130°F.
(e) When fittings and piping are used on
either the upstream or downstream side or both of a safety relief device or
devices, the passages must be so designed that the flow capacity of the safety
relief device will not be reduced below the capacity required for the container
on which the safety relief device assembly is installed, nor to the extent that
the operation of the device could be impaired. Fittings, piping, and method of
attachment must be designed to withstand normal handling and the pressures
developed when the device or devices function.
(f) You must ensure that no shutoff valve is
installed between the safety relief devices and the cylinder.
(5)
Maintenance requirements
for safety relief devices.
(a) As a
precaution to keep cylinder safety relief devices in reliable operating
condition, you must take care in the handling or storing of compressed gas
cylinders to avoid damage. You must also exercise care to avoid plugging by
paint or other dirt accumulation of safety relief device channels or other
parts which could interfere with the functioning of the device. You must only
allow qualified personnel to service safety relief devices.
(b) Each time a compressed gas cylinder is
received at a point for refilling, you must examine all safety relief devices
externally for corrosion, damage, plugging of external safety relief device
channels, and mechanical defects such as leakage or extrusion of fusible metal.
If there is any doubt regarding the suitability of the safety relief device for
service you must not fill the cylinder until it is equipped with a suitable
device.
Notes
Order 73-5, § 296-24-93003, filed 5/9/73 and Order 73-4, § 296-24-93003, filed 5/7/73.
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