(a)

1. (1) All fittings where subjected to container pressure shall be made of materials specified for use with anhydrous ammonia as described herein and designed for a minimum working pressure of not less than two hundred fifty pounds per square inch gauge (250 psig).
2. (2) No cast iron bushings, plugs, or pipe fittings shall be allowed.

(b)

1. (1) Galvanized pipe shall not be used.
2. (2) Black steel or iron pipe, Schedule 40, may be used provided pipe joints are welded or joined by means of welding type flanges.
3. (3) Screwed joints are permissible only with extra heavy, Schedule 80, pipe.
4. (4) Pipe joint compounds shall be resistant to ammonia.

(c)

1. (1) All pipe lines shall be installed as nearly as possible in a straight line with a minimum amount of pipe, and shall not be restricted by an excessive amount of elbows and bends.
2. (2) Where nipples are used, they shall be of extra heavy seamless type.

(d)

1. (1) Flexible connections with a bursting pressure of not less than one thousand seven hundred fifty pounds per square inch gauge (1,750 psig) shall be used for a permanent installation.
2. (2) Other type flexible connections may be used for temporary installation.

3. (3) Provisions shall be made for:

   1. (A) Expansion;
   2. (B) Contraction;
   3. (C) Jarring;
   4. (D) Vibration; and
   5. (E) Settling.

(f)

1. (1) After assembly, all piping and tubing shall be tested and proved to be free from leaks at a pressure not less than the normal operating pressure of the system, or at one hundred fifty pounds per square inch gauge (150 psig), whichever is greater.
2. (2) All containers shall be purged of air on initial filling.