---
kind: "section"
citation: "40 C.F.R. § 1065.644"
title: "40"
number: "1065.644"
heading: "Vacuum-decay leak rate."
url: "https://uscodex.org/cfr/40/1065.644"
---

# §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)](/cfr/40/1065.345.md?p=e). Use the following equation to calculate the leak rate, , and compare it to the criterion specified in [§ 1065.345(e)](/cfr/40/1065.345.md?p=e):

Example:


## Notes

### Amendments

[89 FR 29808, Apr. 22, 2024]

### Authority

Authority: 42 U.S.C. 7401-7671q.

### Source

Source: 70 FR 40516, July 13, 2005, unless otherwise noted.

### Amendments

[89 FR 29808, Apr. 22, 2024]