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): Eq. 1065.644-1 Where: V vac = geometric volume of the vacuum-side of the sampling system. R = molar gas constant. p 2 = vacuum-side absolute pressure at time t 2. T 2 = vacuum-side absolute temperature at time t 2. p 1 = vacuum-side absolute pressure at time t 1. T 1 = vacuum-side absolute temperature at time t 1. t 2 = time at completion of vacuum-decay leak verification test. t 1 = time at start of vacuum-decay leak verification test. Example: V vac = 2.0000 L = 0.00200 m 3 R = 8.314472 J/(mol·K) = 8.314472 (m 2 ·kg)/(s 2 ·mol·K) p 2 = 50.600 kPa = 50600 Pa = 50600 kg/(m·s 2 ) T 2 = 293.15 K p 1 = 25.300 kPa = 25300 Pa = 25300 kg/(m·s 2 ) T 1 = 293.15 K t 2 = 10:57:35 a.m. t 1 = 10:56:25 a.m. [89 FR 29808, Apr. 22, 2024]