Utah Administrative Code
Topic - Environmental Quality
Title R307 - Air Quality
Rule R307-327 - Ozone Nonattainment and Maintenance Areas: Petroleum Liquid Storage
Section R307-327-6 - Retrofits for Floating Roof Tanks
Universal Citation: UT Admin Code R 307-327-6
Current through Bulletin 2024-06, March 15, 2024
(1) Except where specifically exempted in (3) below, all existing external floating roof tanks with capacities greater than 950 barrels (40,000 gals) shall be retrofitted with a continuous secondary seal extending from the floating roof to the tank wall (a rim-mounted secondary seal) if:
(a) The tank is a welded tank, the
true vapor pressure of the contained liquid is 27.6 kPa (4.0 psia) or greater
and the primary seal is one of the following:
(i) A metallic type shoe seal, a
liquid-mounted foam seal, a liquid-mounted liquid-filled seal, or
(ii) Any other primary seals that can be
demonstrated equivalent to the above primary seals.
(b) The tank is a riveted tank, the true
vapor pressure of the contained liquid is 10.5 kPa (1.5 psia) or greater, and
the primary seal is as described in (a) above.
(c) The tank is a welded or riveted tank, the
true vapor pressure of the contained liquid is 10.5 kPa (1.5 psia) or greater
and the primary seal is vapor-mounted. When such primary seal closure device
can be demonstrated equivalent to the primary seals described in (a) above,
these processes apply.
(2) The owner or operator of a storage tank subject to this rule shall ensure that all the seal closure devices meet the following requirements:
(a) There shall be no
visible holes, tears, or other openings in the seals or seal fabric.
(b) The seals must be intact and uniformly in
place around the circumference of the floating roof between the floating roof
and the tank wall.
(c) For vapor
mounted primary seals, the accumulated area of gaps between the secondary seal
and the tank wall shall not exceed 21.2 cm2 per
meter of tank diameter (1.0 in2 per ft. of tank
diameter) and the width of any gap shall not exceed 1.27 cm (1/2 in.). The
owner or operator shall measure the secondary seal gap annually and make a
record of the measurement.
(3) The following are specifically exempted from the requirements of (1) above:
(a)
External floating roof tanks having capacities less than 10,000 barrels
(420,000 gals) used to store produced crude oil and condensate prior to custody
transfer.
(b) A metallic type shoe
seal in a welded tank that has a secondary seal from the top of the shoe seal
to the tank wall (a shoe mounted secondary seal).
(c) External floating roof tanks storing
waxy, heavy pour crudes.
(d)
External floating roof tanks with a closure seal device or other devices
installed that will control volatile organic compounds (VOC) emissions with an
effectiveness equal to or greater than the seals required in (1) above. It
shall be the responsibility of the owner or operator of the source to
demonstrate the effectiveness of the alternative seals or devices to the
director. No exemption under (3) shall be granted until the alternative seals
or devices are approved by the director.
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