40 C.F.R. § 1065.644

Current through September 30, 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:

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

R = molar gas constant.

p₂ = vacuum-side absolute pressure at time t_2.

T₂ = vacuum-side absolute temperature at time t_2.

p₁ = vacuum-side absolute pressure at time t_1.

T₁ = vacuum-side absolute temperature at time t_1.

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

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

Example:

V_vac

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