Instructional Manual For Clarification Of Startup In Source Categories Affected By New Source Performance Standards - U.s. Environmental Protection Agency - 1979 Page 55
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146 pontoon floating roofs.
Double deck roofs have compartmented dead-air spaces
over the entire liquid surface.
The roof also has drains for water accumulation
and vapor traps on the underside of the roof.
A vapor recovery system is designed to handle vapors or1gmating from
filling operations.
The recovered vapors are compressed and charged to an
absorption unit for recovery of condensable hydrocarbons.
The system includes
vapor lines interconnecting the vapor spaces of the tanks that the system
serves.
Each tank should be capable of being isolated from the system.
Tank
isolation and operation is by manual and pressure controlled butterfly-valves,
regulators, and check valves.
Knockout pots are normally us.ed at low points
in the vapor line to remove condensate.
N.oncondensable vapors are piped to a
fuel gas
~ystem
or to a smokeless flare.
When absorption of the condensable
vapors is not practical from an economic standpoint, these vapors, too, are
either sent directly to a fuel system or incinerated in a smokeless flare.
Startup Operations
Since no performance testing is required for petroleum storage vessels,
the 180 day test period does not apply in this case.
However, the proper
operation of either the floating roof and/or vapor recovery system is essential
for the minimization of hydrocarbon emisaions.
Storage vessel sys·tems are in-
spected and checked for structural, mechanical, electrical and hydraulic prob-
lems.
The primary checks for the petroleum storage vessel are water pressure
tests for structural defects and mechanical operation and clearances of the
storage vessel's roof and seals, compressors and vapor control valves and
actuators.
43
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