(C) pressurized loading.
(2) Disposal of transported vapors. After unloading,
transport vessels must be kept vapor-tight until the vapors in the
transport vessel are returned to a loading, cleaning, or degassing
operation and discharged in accordance with the control requirements
of that operation.
(3) Leak-free requirements. All land-based VOC transfer
to or from transport vessels shall be conducted such that:
(A) all liquid and vapor lines are:
(i) equipped with fittings which make vapor-tight connections
and that close automatically when disconnected; or
(ii) equipped to permit residual VOC after transfer
is complete to discharge into a recovery or disposal system which
routes all VOC emissions to a vapor control system or a vapor balance
system. After VOC transfer, if necessary to empty a liquid line, the
contents may be placed in a portable container, which is then closed
vapor-tight and disposed of properly.
(B) there are no VOC leaks, as defined in §101.1
of this title, when measured with a hydrocarbon gas analyzer, and
no liquid or vapor leaks, as detected by sight, sound, or smell, from
any potential leak source in the transport vessel and transfer system
(including, but not limited to, liquid lines, vapor lines, hatch covers,
pumps, and valves, including pressure relief valves);
(C) all gauging and sampling devices are vapor-tight
except for necessary gauging and sampling. Any nonvapor-tight gauging
and/or sampling shall:
(i) be limited in duration to the time necessary to
practicably gauge and/or sample; and
(ii) not occur while VOC is being transferred;
(D) any openings in a transport vessel during unloading
are limited to minimum openings which are sufficient to prevent collapse
of the transport vessel;
(E) if VOC is loaded through the hatches of a transport
vessel, then pneumatic, hydraulic, or other mechanical means shall
force a vapor-tight seal between the loading arm's vapor collection
adapter and the hatch. A means shall be provided which prevents liquid
drainage from the loading device when it is removed from the hatch
of any transport vessel, or which routes all VOC emissions to a vapor
control system. After VOC transfer, if necessary to empty a liquid
line, the contents may be placed in a portable container, which is
then closed vapor-tight and disposed of properly.
(4) Gasoline terminals. The following additional control
requirements apply to gasoline transfer at gasoline terminals.
(A) A vapor control system must be used to control
the vapors from loading the transport vessel.
(B) Vapor control systems and loading equipment at
gasoline terminals shall be designed and operated such that gauge
pressure does not exceed 18 inches of water and vacuum does not exceed
six inches of water in the gasoline tank-truck.
(C) Each gasoline terminal shall be equipped with sensors
and other equipment designed and connected to monitor the status of
the control device. If the control device malfunctions or is not operational,
the system shall automatically stop gasoline transfer to the transport
vessel(s) immediately.
(D) As an alternative to subparagraph (C) of this paragraph,
the following requirements apply to gasoline terminals which have
a variable vapor space holding tank design that can process the vapors
independent of transport vessel loading. Such gasoline terminals shall
be equipped with sensors and other equipment designed and connected
to monitor the status of the control device. If the variable vapor
space holding tank serving the loading rack(s) does not have the capacity
to store additional vapors for processing by the control device at
a later time and the control device malfunctions or is not operational,
the system shall automatically stop gasoline transfer to the transport
vessel(s) immediately.
(5) Gasoline bulk plants. The following additional
control requirements apply to gasoline transfer at gasoline bulk plants.
(A) A vapor balance system must be used between the
storage tank and transport vessel. Alternatively, a vapor control
system which maintains a control efficiency of at least 90% may be
used to control the vapors.
(B) While filling a transport vessel from a storage
tank:
(i) the transport vessel, if equipped for top loading,
must use a submerged fill pipe; and
(ii) gauge pressure must not exceed 18 inches of water
and vacuum must not exceed six inches of water in the gasoline tank-truck
tank.
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Source Note: The provisions of this §115.212 adopted to be effective February 19, 1990, 15 TexReg 549; amended to be effective July 17, 1991, 16 TexReg 3719; amended to be effective August 1, 1992, 17 TexReg 4683; amended to be effective December 3, 1993, 18 TexReg 8538; amended to be effective May 27, 1994, 19 TexReg 3703; amended to be effective June 16, 1995, 20 TexReg 4048; amended to be effective March 7, 1996, 21 TexReg 1548; amended to be effective May 22, 1997, 22 TexReg 4213; amended to be effective July 21, 1999, 24 TexReg 5488; amendedto be effective December 2, 1999, 24 TexReg 10559; amended to be effective January 18, 2001, 26 TexReg 493; amended to be effective May 16, 2024, 49 TexReg 3292 |