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(a) All devices which are used in anhydrous ammonia service shall be of a type and construction suitable for the use to which they are put. They shall preferably be listed by at least one nationally recognized testing laboratory such as, but not limited to, Underwriters Laboratories, Inc. and Factory Mutual Engineering Corp. (For the purposes of this paragraph, the word "listed" means that equipment is of a kind mentioned in a list which is published by a nationally recognized laboratory which makes periodic inspection of the production of such equipment, and states such equipment meets nationally recognized standards or has been tested and found safe for use in a specified manner).
The Division may approve or accept devices upon satisfactory evidence that they are designed and constructed for safe operation in anhydrous ammonia service.
Drawings and calculations for custom-built devices must be submitted to the Division for acceptance. Both the drawings and calculations must bee signed by a registered professional engineer.
1. Amendment filed 12-8-72 as procedural and organizational; effective upon filing (Register 72, No. 50).
2. Amendment filed 3-28-75; effective thirtieth day thereafter (Register 75, No. 13).
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