40 C.F.R. § 1065.644

Current through October 31, 2024
Section 1065.644 - Vacuum-decay leak rate

This section describes how to calculate the leak rate of a vacuum-decay leak verification, which is described in § 1065.345(e) . Use the following equation to calculate the leak rate,, and compare it to the criterion specified in § 1065.345(e) :

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Eq. 1065.644-1

Where:

Vvac = geometric volume of the vacuum-side of the sampling system.

R = molar gas constant.

p2 = vacuum-side absolute pressure at time t2.

T2 = vacuum-side absolute temperature at time t2.

p1 = vacuum-side absolute pressure at time t1.

T1 = vacuum-side absolute temperature at time t1.

t2 = time at completion of vacuum-decay leak verification test.

t1 = time at start of vacuum-decay leak verification test.

Example:

Vvac

R = 8.314472 J/(mol·K) = 8.314472 (m2·kg)/(s2·mol·K)

p2

t2

p1

T1

t2

= 10:56:25 a.m.

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40 C.F.R. §1065.644

89 FR 29808 , Apr. 22, 2024
89 FR 29808 , 6/21/2024