1. Any transfer hose utilized at an anhydrous ammonia storage facility: a. Which is a liquid transfer hose and is not drained of liquid upon completion of transfer operations must be equipped with an approved shutoff valve at the discharge end. b. Must have a hydrostatic relief valve or equivalent must be installed in each section of hose or pipe in which liquid ammonia can be isolated between shutoff valves to relieve the pressure that could develop from the trapped liquid. If an equivalent pressure relief device is used, the maximum accumulated pressure possible within the system may not exceed the limits of the system. A hydrostatic relief valve must be installed between each pair of valves in which liquid is trapped. The start -to-discharge pressure setting of the relief valve must not be less than three hundred fifty pounds per square inch [2413.18 kilopascals] gauge nor more than four hundred pounds per square inch [2757.92 kilopascals] gauge. c. Must have etched, cast, or impressed on the outer coating all of the following: (1) The words "ANHYDROUS AMMONIA". (2) The maximum working pressure of the transfer hose. (3) The name of the manufacturer of the hose. (4) The date of manufacture or the expiration date of the hose. d. Which is cut, scraped, cracked, or weathered so that the inner white cord is visible must be replaced. A transfer hose with an expiration date printed on the hose must be replaced prior to that date. Transfer hoses without an expiration date must be replaced as follows: (1) Rayon hoses must be replaced within two years of the date of manufacture. (2) Nylon hoses must be replaced within four years of the date of manufacture. (3) Steel-reinforced hoses must be replaced within six years of the date of manufacture. 2. Notwithstanding the replacement dates determined under subdivision d of subsection 1 for transfer hoses with or without an expiration date, an additional year must be allowed for replacement of transfer hoses in order to take into account delays in the original installation of transfer hoses.
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