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Subchapter 1. Unfired Pressure Vessel Safety Orders
Article 6. Anhydrous Ammonia

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§510. Hose Specifications.

(a) Hose and hose connections shall be fabricated of materials that are resistant to the action of anhydrous ammonia. Hose used in ammonia service shall conform to ANI-RMA (or TFI-RMA) Standard No. M-5 for anhydrous ammonia hose. (TFI-RMA) stands for The Fertilizer Institute-Rubber Manufacturers Association.)

Metallic hose is a hose which the strength depends primarily upon the strength of its metallic parts, but it may have nonmetallic liners and/or covers. The metal used in this hose shall be stainless steel or other suitable materials acceptable to the Division.

All hose and hose connections subjected to tank pressure shall be designed for a minimum working pressure of 350 psi with a factor of safety of at least 5.

After the hose connections are made up, they shall withstand without leakage a test pressure of twice the working pressure for which the hose is designed.

Hose and hose connections located on the low-pressure side of pressure-reducing valves or devices and discharging to atmospheric pressure shall be designed for a working pressure of at least 125 psi with a factor of safety of at least 5.

(b) All hose 1/2 inch in diameter and larger used for either liquid or vapor service shall be permanently and clearly marked at intervals of not more than 5 feet with the following information:

(1) The words "Anhydrous Ammonia" or "NH(3)"

(2) The designed working pressure

(3) The manufacturer's name or trademark

(4) The year of manufacture

Hose smaller than 1/2 inch in diameter need only be marked with items (1) and (2) above.

(c) All anhydrous ammonia hoses and hose connections subjected to tank pressure shall be tested at least once each year to twice the tank working pressure but not less than 500 psi. While in transit all hoses and hose connections shall be protected from wear or injury.

All low-pressure hose shall be constructed for ammonia service with a factor of safety of at least 5, but in no case shall hose be used for this service unless designed for a working pressure of at least 125 psi with a factor of safety of at least 5.

HISTORY:

1. Amendment filed 12-8-72 as procedural and organizational; effective upon filing (Register 72, No. 50).

2. Amendment of subsections (a) and (c) filed 3-28-75; effective thirtieth day thereafter (Register 75, No. 13).

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