Section 326IAC8-4-3. Petroleum liquid storage facilities

   (a) This section will apply to all petroleum liquid storage vessels with capacities greater than one hundred fifty thousand (150,000) liters (thirty-nine thousand (39,000) gallons) containing volatile organic compounds whose true vapor pressure is greater than 10.5 kPa (1.52 psi).

  (b) External Fixed Roof Tanks.

(1) No owner or operator of an affected fixed roof tanks shall permit the use of such facility unless:

(A) The facility has been retrofitted with an internal floating roof equipped with a closure seal, or seals, to close the space between the roof edge and tank wall unless the source has been retrofitted with equally effective alternative control which has been approved.

(B) The facility is maintained such that there are no visible holes, tears, or other openings in the seal or any seal fabric or materials.

(C) All openings, except stub drains, are equipped with covers, lids, or seals such that:

(i) the cover, lid, or seal is in the closed position at all times except when in actual use;

(ii) automatic bleeder vents are closed at all times except when the roof is floated off or landed on the roof leg supports;

(iii) rim vents, if provided, are set to open when the roof is being floated off the roof leg supports or at the manufacturer’s recommended setting.

  (c) External Floating Roof Tanks.

(1) This subsection applies to applicable open top tanks with a cover consisting of a double deck or pontoon single deck which rests upon and is supported by the petroleum liquid being contained and is equipped with a closure seal or seals to close the space between the roof edge and tank wall.

This subsection does not apply to vessels which:

(A) are used to store a crude oil with a pour point of 50° F. or higher as determined by the ASTM Standard D97-66 (reapproved 1978) "Pour Point of Petroleum Oils" ASTM Part 15, 1981 ASTM, 1916 Race Street, Philadelphia, PA 19103 Library of Congress Cat. Card #40-10712;

(B) have capacities less than one million six hundred thousand (1,600,000) liters (four hundred twenty thousand (420,000) gal) and are used to store produced crude oil and condensate prior to lease custody transfer. "Condensate" means hydrocarbon liquid separated from natural gas which condenses due to changes in the temperature and/or pressure and remains liquid at standard conditions. "Lease custody transfer" means the transfer of produced crude oil and/or condensate, after processing and/or treating in the producing operations, from storage tanks or automatic transfer facilities to pipelines or any other forms of transportation;

(C) contain a petroleum liquid with a true vapor pressure less than 27.6 kPa (4.0 psi); and

(i) are of welded construction; and

(ii) presently possess a metallic-type shoe seal, a liquid-mounted foam seal, a liquid-mounted liquid filled-type seal, or other closure device of demonstrated equivalence approved by the commissioner; or

(D) are of welded construction, equipped with a metallic-type shoe primary seal and has a secondary seal from the top of the shoe seal to the tank wall (shoe-mounted secondary seal).

(2) No owner of a facility subject to this subsection shall store a petroleum liquid in that facility unless:

(A) The facility has been fitted with:

(i) a continuous secondary seal extending from the floating roof to the tank wall (rim-mounted secondary seal); or

(ii) a closure or other device approved by the commissioner which is equally effective.

(B) All seal closure devices meet the following requirements:

(i) there are no visible holes, tears, or other openings in the seal(s) or seal fabric;

(ii) the seal(s) are intact and uniformly in place around the circumference of the floating roof between the floating roof and the tank wall.

(iii) for vapor mounted primary seals, the accumulated gap area around the circumference of the secondary seal where a gap exceeding one-eighth (⅛) inch exists between the secondary seal and the tank wall shall not exceed 1.0 square inch per foot of tank diameter. There shall be no gaps exceeding one-half (½) inch between the secondary seal and the tank wall of welded tanks and no gaps exceeding one (1) inch between the secondary seal and the tank wall of riveted tanks.

(C) All openings in the external floating roof, except for automatic bleeder vents, rim space vents, and leg sleeves, are:

(i) equipped with covers, seals, or lids in the closed position except when the openings are in actual use; and

(ii) equipped with projections into the tank which remain below the liquid surface at all times.

(D) automatic bleeder vents are closed at all times except when the roof is floated off or landed on the roof leg supports;

(E) rim vents are set to open when the roof is being floated off the leg supports or at the manufacturer’s recommended setting; and

(F) emergency roof drains are provided with slotted membrane fabric covers or equivalent covers which cover at least ninety percent (90%) of the area of the opening.

  (d) Record Keeping and Reporting. Owners or operators of petroleum liquid storage vessels shall maintain records of the types of volatile petroleum liquid stored, the maximum true vapor pressure of the liquid as stored, and the results of the inspections performed on the storage vessels. Such records shall be maintained for a period of two (2) years and shall be made available to the commissioner upon written request. (Air Pollution Control Division; 326 IAC 8-4-3; filed Mar 10, 1988, 1:20 pm: 11 IR 2538; readopted filed Jan 10, 2001, 3:20 p.m.: 24 IR 1477)