Code of Massachusetts Regulations › 310 CMR - DEPARTMENT OF ENVIRONMENTAL PROTECTION › Title 310 CMR 7.00 - Air Pollution Control › Section 7.24 - U Organic Material Storage and Distribution

Current through Register 1525, July 5, 2024
(1)
Organic Material Storage
			 Tanks
. No person who owns, leases, operates or controls a storage
			 tank with a capacity equal to or greater than 40,000 gallons, into which
			 organic material having a vapor pressure of 1.5 pounds per square inch absolute
			 or greater under actual storage conditions, is placed, stored, or held shall
			 store, hold or otherwise transfer the organic material in the storage tank
			 unless:
(a) each tank is equipped with a
			 submerged fill pipe; and,
(b) each
			 tank not equipped with an external floating roof (
see
310 CMR
			 7.24(1)(c)) is equipped with one of the following control devices:
1. a pressure tank system which maintains
			 pressure at all times so as to prevent organic material loss to the atmosphere;
			 or,
2. a vapor recovery system
			 which collects all of the organic vapors emitted from the tank, and a vapor
			 control system which reduces emissions of vapors to the atmosphere by at least
			 95% over every three hour period; or
3. if the tank does not store organic
			 material with a true vapor pressure greater than 11.0 psia under actual storage
			 conditions, then a fixed roof and a floating roof consisting of a pontoon,
			 double deck, or internal floating roof which rests on the surface of the liquid
			 contents and is equipped with a closure seal, or seals, to close the space
			 between the roof edge and tank wall, and tank gauging and sampling devices
			 which are gas tight except when in use; or,
4. any other equipment equal to or greater in
			 efficiency than listed in 310 CMR 7.24(1)(b)2. and approved by the Department
			 and EPA; and
(c) on or
			 after November 1, 1984, each external floating roof tank is equipped with an
			 external floating roof of a pontoon, double deck, or external floating cover
			 design, which rests on the surface of the liquid contents; and is fitted with a
			 primary seal and a continuous secondary seal which seals the space between the
			 edge of the floating roof and the tank wall; and stores organic material which
			 has a vapor pressure less than 11.0 pounds per square inch absolute under
			 actual storage conditions; and all tank gauging or sampling devices are gas
			 tight except when in use; and,
(d)
			 each of the seal(s) required by 310 CMR 7.24(1)(b)3. and 310 CMR 7.24(1)(c)
			 meet the following requirements, where applicable:
1. there are no visible holes, tears, or
			 other openings in the seal(s) or seal fabric; and,
2. the seal(s) is intact and uniformly in
			 place around the circumference of the floating roof between the floating roof
			 and the tank wall; and,
3. for
			 vapor mounted primary seals on any external floating roof tank, the accumulated
			 area of gaps between the secondary seal and the tank wall which exceed 0.32 cm
			 (c in.) in width do not exceed 21.2 square cm per meter of tank diameter (1.0
			 square in per ft of tank diameter), as determined by 310 CMR 7.24(1)(k);
			 and
4. measurement of the gap in
			 the secondary seal is made annually, and such measurement complies with 310 CMR
			 7.24(1)(d)3.; and,
5. a visual
			 inspection of the secondary closure seal is conducted semi-annually;
			 and,
6. an inspection of internal
			 floating roofs is conducted through the roof hatches monthly; and,
7. an inspection of cover and seal for
			 internal floating roofs is conducted whenever the tank is emptied for
			 nonoperational reasons or once every ten years whichever is sooner;
			 and,
(e) all openings in
			 a floating roof, except for automatic bleeder vents, rim space vents, and leg
			 sleeves, are:
1. equipped with covers, seals,
			 or lids which are kept closed except when the openings are in actual use;
			 and,
2. equipped with projections
			 into tank which remain below-the-liquid surface at all times; and
(f) automatic bleeder vents are
			 kept closed except when the roof is being floated off of, or being landed on,
			 the roof leg supports; and,
(g) rim
			 vents are set to open when the roof is being floated off the leg supports, or
			 at the manufacture recommended setting; and,
(h) emergency roof drains are provided with
			 slotted membrane fabric covers or equivalent covers which cover at least 90% of
			 the area of the opening; and,
(i)
Recordkeeping and Reporting
. for any tank with a
			 capacity of 40,000 gallons or more which contains an organic liquid with a true
			 vapor pressure greater than 1.5 psia, records are prepared, maintained and kept
			 onsite for a minimum of two years: of the average monthly storage temperature;
			 of the true vapor pressure, monthly throughput and type of organic material
			 stored; of any inspections or tests conducted under 310 CMR 7.24(1)(d)4.
			 through 7.; of any transfers made; and of any maintenance of the vapor
			 processing system; and,
(j)  for any
			 tank with a capacity in excess of 40,000 gallons which is equipped with an
			 external floating roof and which contains any organic material with a vapor
			 pressure greater than 1.0 psia but less than 1.5 psia under actual storage
			 conditions, records are maintained and kept for a minimum of two years; of the
			 average monthly storage temperature and the type of liquid stored and its vapor
			 pressure; and
(k) the total area of
			 gaps under 310 CMR 7.24(1)(d)3. is determined by physically measuring the
			 length and width of all gaps around the entire circumference of the secondary
			 seal in each place where a c in. uniform diameter probe passes freely (without
			 forcing or binding against the seal) between the seal and the tank wall, and
			 summing the area of the individual gaps; any person who proposes to conduct
			 this test shall notify the Department at least 30 days before the test so the
			 Department may, at its option, observe the test.
(l)310 CMR 7.24(1)(a) through 310 CMR
			 7.24(1)(k) do not apply to petroleum liquid storage tanks which are used to
			 store waxy, heavy pour crude oil, or which have a capacity less than 416,000
			 gallons and are used to store produced crude oil and condensate prior to lease
			 custody transfer.