Chapter 6 Compressed Gas Cylinders
6-1 Design and Construction.
Cylinders shall be designed,
fabricated, tested, and marked (stamped) in accordance with
regulations of DOT, TC, or the
“
Rules for the Construction of
Unfired Pressure Vessels,
”
Section VIII, ASME
Boiler & Pressure
Vessel Code
.
6-2 Defective Cylinders.
Defective cylinders shall be
returned to the supplier. Suppliers shall repair the cylinder,
remove it from service, or dispose of it in an approved man-
ner.
6-3 Cylinders Containing Residual Gas.
Compressed gas cyl-
inders having residual product shall be treated as full except
when being examined, serviced, or refilled by a gas manufac-
turer or distributor.
6-4 Valve Protective Caps.
Where compressed gas cylinders
are designed to accept valve protective caps, the user shall
keep such caps on compressed gas cylinders at all times except
when being filled or connected for use.
6-5 Valve Outlet Caps or Plugs.
Where gastight valve outlet
caps or plugs are provided, the user shall keep such devices on
the valve outlet at all times except when compressed gas cylin-
ders are being filled or connected for use.
6-6 Securing Cylinders.
Compressed or liquefied gas cylin-
ders in use or in storage shall be secured to prevent them from
falling or being knocked over.
Exception No. 1: Compressed gas cylinders in the process of exami-
nation, servicing, and refilling.
Exception No. 2: At cylinder-filling plants and distributors
’
ware-
houses, the nesting of cylinders shall be permitted to secure cylinders.
6-7 Cylinder Orientation.
Compressed gas cylinders shall be
permitted to be stored and used in the horizontal position.
6-8 Cylinders Exposed to Fire.
Compressed gas cylinders
exposed to fire shall not be used until they are requalified in
accordance with the pressure vessel code under which they
were manufactured.
6-9 Exposure to Electrical Circuits.
Compressed gas cylin-
ders shall not be placed where they could become a part of an
electrical circuit.
6-10 Temperature Limits.
Compressed gas cylinders shall
not be exposed to temperatures exceeding 125
°
F (52
°
C). Cyl-
inders shall not be subjected to direct heating to increase
vapor pressure.
Exception: When cylinders are being refilled.