California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 1 - Unfired Pressure Vessel Safety Orders
Article 6 - Anhydrous Ammonia
Section 503 - Portable Tanks

(a) Portable tanks installed as permanent installations for periods of time exceeding 90 days shall be in compliance with Section 501.

Portable tanks filled at point of use shall be installed substantially level. A safe and accessible source of clean water (minimum 5 gallons) shall be immediately available to enable an employee to wash his eyes in case of accidental sprays or spillage. If a container is used, it shall have a suitable opening to permit the application of water to flush the eyes.

(b) Portable tanks shall comply with these orders, and legs or other supporting structures shall be secured to tanks in accordance with the code or rules under which the tank is designed and built, and shall be designed to withstand a loading in any direction equal to the loaded weight of the tank when filled to the maximum permissible level with a factor of safety of at least 8.

(c) Fittings on all portable tanks shall be installed in recessed wells or otherwise protected to prevent damage to the fittings during transportation and use.

(d) When portable tanks are transported from 1 location to another, they shall be securely fastened to the transporting vehicle.

(e) When containers are mounted on four-wheel trailers, care shall be taken to insure that the weight is distributed evenly over both axles.

(f) When the cradle and the tank are not welded together suitable material shall be used between them to eliminate metal-to-metal friction.