Vacuum-decay leak rate.

  1. Law
  2. CFR 40
  3. Protection of Environment
  4. Environmental Protection Agency
  5. Air Pollution Controls
  6. Engine-Testing Procedures
  7. Calculations and Data Requirements
  8. Vacuum-decay leak rate.

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§ 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 ṅleak, 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) = 8.314472 (m2 · kg)/(s2 · mol · K)

p2 = 50.600 kPa = 50600 Pa = 50600 kg/(m · s2)

T2 = 293.15 K

p1 = 25.300 kPa = 25300 Pa = 25300 kg/(m · s2)

T1 = 293.15 K

t2 = 10:57:35 a.m.

t1 = 10:56:25 a.m.

[79 FR 23795, Apr. 28, 2014]


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