R 299.2486 Vessels used for storing brine; equipment requirements.

Rule 2486. A vessel which is located at a well that is used for the storage of brine is subject to all of the following requirements: (a) A permittee shall install a sealing, pressure-vacuum-type hatch, except that a pressure- vacuum-type hatch is not required on a storage vessel if the venting of vapor to the atmosphere is permitted under subdivision (c) of this rule. A hatch shall be kept closed when a tank is not being gauged. (b) Except as provided in subdivision (c) of this rule, a permittee shall install a vent line for conveying released gasses and vapors to an incinerator, flare, vapor recovery system, or other system designed to prevent release of hydrogen sulfide to the atmosphere. A flashback prevention system shall be installed on the line between a vessel and an incinerator or flare. If a vapor recovery or other system is used, then a flare or incinerator shall be available for emergency use. (c) A vessel may be vented to the atmosphere if the vent is located not less than 11 feet above the tank top and if the opening of the vent is within the diked area or not less than 20 feet above the ground if the opening of the vent is outside the diked area, and venting does not result in a nuisance odor. (d) A permittee of a well shall install a fence around the vessel. The fence shall have a gate and be located not less than 20 feet from the base of a storage vessel. A permittee shall ensure that warning signs with the word "danger" or "caution" followed by the words "poison gas" are installed on all sides of the fence. If the supervisor of mineral wells or authorized representative of the supervisor of mineral wells finds that a threat to the public safety exists due to emissions of sulfur-bearing gas or vapor, then fencing other than that specified in R 299.2302(q) may be required. (e) The supervisor of mineral wells may require the use of a tank gauging system that does not require the opening of the tank hatches if a verified chronic nuisance odor results from tank gauging.