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Q557. For blowdown vent stacks the preamble indicates that blowdowns from containers less than 50 cubic feet total physical volume are exempt from reporting. However, requirements under 98.233(i) refer to "50 standard cubic feet", which could imply a gas volume rather than a physical container volume. In comments to the proposed Subpart W, GPA had suggested a threshold of 50 cubic feet of physical container volume and we assume that is the intent here. Please clarify.
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A557.

...

The

...

unique

...

physical

...

volume

...

between

...

isolation

...

valves

...

should

...

be

...

considered

...

against

...

the

...

50

...

cubic

...

feet

...

threshold

...

for

...

blowdown

...

vent

...

stacks.

...

As

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stated

...

in

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40

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CRF

...

§

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98.233

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(i)(2),

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unique

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physical

...

volumes

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smaller

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than

...

50

...

cubic

...

feet

...

are

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exempt

...

from

...

reporting

...

under

...

§

...

98.233

...

(i).

...

Please

...

see

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EPA-HQ-OAR-2009-0923-1018-27

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in

...

Response

...

to

...

Comments

...

(pages

...

1464-1465)

...

(

...

http://www.epa.gov/ghgreporting/documents/pdf/2010/Subpart-W_RTC_part2.pdf

...

).

...

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Source: EPA, Frequently Asked Questions, Petroleum and Natural Gas Systems, July 2011, [http://www.epa.gov/climatechange/emissions/downloads11/documents/Subpart-W-additional-faq.pdf]. Modified by M. Eaddy 7/26/2012

Approval / Publishing History: Version 3, Revised to update URLs per direction from K. Sibold, 9/27/2012

Expiration: none

Relevant Subpart: W
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