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# Out-breathing, m3/h, N.m3/h

## Out-breathing, m3/h, N.m3/h

(OP)
Hi guys

I have a doubt. API 2000 - 2014 in point 3.3.2.2.1 (eq (1)) says.... "The out-breathing volumetric flow rate Vop , expressed in SI units of cubic meters per hour of vapor/gas
at the actual pressure and temperature conditions of the tank vapor space, shall be as given by Equation (1)". If the tank has P op = 2,5 [psig] and T air = 289 [K], then I must to convert those [m3/h] (at Pop and Tair) to N.m3/h... right?

My doubt is based in that all equations or tables of API's rest, are in N.m3/h (including Annex D Basis of sizing equations)..... does exist a mistake in the Standar and should be N.m3/h for all? i.e. equations (1) and (2) are in normal conditions (Pn = 101,325 [kPa] Tn = 273 [K]).

Regards
DM

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