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(a) All pipe between the container and first shutoff valve shall be Schedule
80 (extra heavy). All fittings between the container and first shutoff valve
shall be steel as required by Section 480(c).
Aboveground piping in excess of 1 1/2 inch pipe size may be Schedule 40 when
used beyond the first shutoff valve, providing:
(1) Threaded connections are used and the piping is used for vapor service only
at less than 125 psi.
(2) Welded connections are used and the piping is used for liquid or vapor service
at less than 400 psi.
All other piping shall be Schedule 80.
Where used, flare nuts shall be of forged brass.
All welded piping shall be fabricated and tested in accordance with the ANSI
Standard Code for Pressure Piping, Section 3, Petroleum Refinery Piping B-31.3,
1993 Edition or equivalent.
(b) Piping outside of buildings may be either buried or installed aboveground
and shall be well-supported and protected against mechanical injury. All underground
piping shall be Schedule 80 and shall be buried not less than 18 inches below
the surface of the ground, unless otherwise protected, and shall be protected
from corrosion by approved corrosion-resistant material and by cathodic protection.
Voltage readings from the cathodic system shall be taken and recorded annually
and shall produce a negative voltage of at least 0.85 volts with reference to
a saturated copper-copper sulfide half-cell. Where impressed current is used,
amperage and voltage readings shall be recorded at 6-month intervals.
(c) All steel fittings used with Schedule 80 pipe shall be Schedule 80 if butt
welded, 3,000 pounds WOG if socket welded, and 2,000 pounds WOG forged steel
if threaded. All other steel fittings shall have a rating of at least Schedule
40 if butt welded, and 2,000 pounds WOG if socket welded or threaded.
All steel valves and fittings shall have a steam rating of at least one hundred
fifty (150) psi, ANSI standard, with a minimum WOG rating of 250 psi. Valves
of material other than steel shall have a pressure rating of at least two hundred
(200) psi steam, or four hundred (400) psi WOG. The manufacturer of LP-Gas valves
shall stamp or otherwise permanently mark the valve body to indicate the pressure
rating. Steam valves when used for LP-Gas service shall be refitted for such
service. Valve seat material, packing, gaskets, etc., shall be resistant to
the action of LP-Gas.
(d) The use of the following is prohibited:
(1) Valves of a design that will allow the valve stem to be removed without
removal of complete valve bonnet.
(2) Valves with valve stem packing glands which cannot be repacked under pressure,
unless there is another valve of acceptable type between them and the tank.
(3) Aluminum tubing.
(4) Pipe nipples used in lieu of couplings or flanges on tanks.
(5) Multivalves without excess-flow valves and fixed dip tubes for use other
than DOT cylinders.
(e) In addition to the valves required in NFPA 58, Section 2-3.3.2, all liquid
and vapor connections shall be fitted with manually operated shutoff valves
located as close to the container as practicable.
(f) Where containers are in liquid service or a combination of liquid and vapor
service, all connections with manually operated shutoff valves shall be legibly
labeled to indicate whether they communicate with the vapor or liquid space.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 13241, Health and Safety Code.
HISTORY:
1. Amendment filed 4-1-77; effective thirtieth day thereafter (Register 77,
No. 14). For prior history, see Register 75, No. 45.
2. Amendment of section, including repealer of table 480, and new Note filed
12-4-96; operative 1-3-97 (Register 96, No. 49).
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