| (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.
|
| 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 TexReg5488;amended to be effective December 2, 1999, 24 TexReg 10559; amended to be effective January 18, 2001, 26 TexReg 493 |
