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 Eq. 1065.644-1 to calculate the leak rate, n
[=E T=8052]leak, and compare it to the criterion specified in § 1065.345(e).
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 = 2.0000 L = 0.00200 m3
R = 8.314472 J/(mol·K)
p2 = 50.600 kPa = 50600 Pa
T2 = 293.15 K
p1 = 25.300 kPa = 25300 Pa
T1 = 293.15 K
t2 = 10:57:35 AM
t1 = 10:56:25 AM