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API RP 505 (hazardous area classification) Annex D

API RP 505 (hazardous area classification) Annex D

API RP 505 (hazardous area classification) Annex D

(OP)
API RP 505 for "Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class 1, Zone 0, Zone 1, and Zone 2" contains an Appendix D (Informative Annex) with an alternate method for area classification.

Radii as found using this alternate method can be quite different from the ones calculated using methods from chapters 8-10 of the Recommended Practice. Anyone having any idea why this appendix is there, an when it should be applied?

RE: API RP 505 (hazardous area classification) Annex D

Based on API RP 505, the recommended ventilation for hazardous and non-hazardous areas is 12 and 6 ach respectively.  From  a Fugitive Emissions study I came up with only 2ach required for adequate ventilation.  What flow rate I should apply?  The recommended or the calculated?

Is that recommended ACH for the "whole room" or just the zone 1 area limited by the extensions suggested by API RP 505?

Please help... :-/

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