6004.4 Additional indoor requirements. Additional requirements applicable to the indoor

storage and use of highly toxic and toxic compressed gases shall be in accordance with Sections 6004.4 through 6004.4.8.2

6004.4.1 Cylinder and tank location. Cylinders shall be located within gas cabinets,
exhausted enclosures or gas rooms. Portable and stationary tanks shall be located within
gas rooms or exhausted enclosures.

Exception:
1. Where a gas detection system is provided in accordance with 6004.4.8

6004.4.2 Ventilated areas. The room or area in which gas cabinets or exhausted enclosures
are located shall be provided with exhaust ventilation. Gas cabinets or exhausted enclosures
shall not be used as the sole means of exhaust for any room or area.

6004.4.3 Piping and controls. In addition to the requirements of Section 5003.2.2, piping
and controls on stationary tanks, portable tanks, and cylinders shall comply with the
following requirement:

1. Stationary tanks, portable tanks, and cylinders in use shall be provided with a
means of excess flow control on all tank and cylinder inlet or outlet connections.
Exceptions:
1. Inlet connections designed to prevent backflow.
2. Pressure relief devices.

6004.4.4 Gas rooms. Gas rooms shall comply with Section 5003.8.4 and both the
following requirements:

1. The exhaust ventilation from gas rooms shall be directed to an exhaust system.
2. Gas rooms shall be equipped with an approved automatic sprinkler system.
Alternative fire-extinguishing systems shall not be used.

6004.4.5 Treatment systems. The exhaust ventilation from gas cabinets, exhausted
enclosures and gas rooms, required in Section 6004.4.1 shall be directed to a treatment
system. The treatment system shall be utilized to handle the accidental release of gas and
to process exhaust ventilation. The treatment system shall be designed in accordance with
Sections 6004.2.2.7.1 through 6004.2.2.7.5 and Chapter 5 of the California Mechanical

Code.

Exceptions:

1. Highly toxic and toxic gases—storage. A treatment system is not required for cylinders, containers and tanks in storage where all the following controls are

   provided: