Instructional Manual For Clarification Of Startup In Source Categories Affected By New Source Performance Standards - U.s. Environmental Protection Agency - 1979 Page 114
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146 GRANULAR TRIPLE SUPERPHOSPHATE STORAGE FACILITIES - SUBPART X
§60.240 - 60.244
Introduction
This subpart regulates any facility curing or storing granular triple
superphosphate (GTSP).
Affected facilities include any combination of storage
or curing piles, conveyors, elevators, screens, and mills.
Emissions of total
fluorides are limited to 0.25 g/hr/metric ton (5
x
10- 4 lb/hr/ton) of equiva-
lent P
2
0
S
stored (the quantity of phosphorous, expressed as phosphorous pent-
oxide, being cured or stored).
Sources constructed, reconstructed or modified
after October 22, 1974, are subject to the standard.
Process Description
After manufacture, GTSP is transferred to the storage building for curing
(completion of reaction).
Curing serves to increase the physical strength of
the granules and the availabilitr of P 2 0
S
as plant food by further promotion
of the reaction between the phosphoric acid and phosphate rock.
The activities
within the'storage plant are Hlustrated in Figure
23.
Granular product is
transferred to a storage pile where curing takes place and from which fluorides
evolve.
Front-end loaders move the product to the screening area from which
oversize material is rejec"t,ed, pulverized, and returned to the screen; under-
size material is returned to the production plant; and on-grade material is
delivered to shipping.
Pre-Startup Operations
Mechanical equipment which must be checked within the storage facility
are very much similar to the dry segments of the diammonium phosphate and
triple superphosphate plants.
Conveyors, screens, mills, and elevators are
all operated dry, prior to delivery of material, to verify proper installation
and mechanical operation and to check for excessive v:f.bration and correct
alignment of gear-driven components.
Startup
Opera~ions
The operation of the GTSP storage facility is obviously dependent upon the
operation of the production plant.
Therefore, startup would be best defined
as the first delivery of product to the storage pile from the GTSP plant.
Pro-
blems that might occur with equipment downstream of the storage pile could
result in a shutdown and subsequent re-startup of both facilities, and there-
fore, enforcement personnel would have to closely follow the operations of
both facilities.
102
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