---
kind: "section"
citation: "43 C.F.R. § 3175.116"
title: "43"
number: "3175.116"
heading: "Composite sampling methods."
url: "https://uscodex.org/cfr/43/3175.116"
---

# §3175.116. Composite sampling methods.

- (a) Composite samplers must be flow-proportional.
- (b) Samples must be collected using a positive-displacement pump.
- (c) Sample cylinders must be sized to ensure the cylinder capacity is not exceeded within the normal collection frequency.

## Notes

### Source

Source: 81 FR 81609, Nov. 17, 2016, unless otherwise noted.

### Authority

Authority: 25 U.S.C. 396d and 2107; 30 U.S.C. 189, 306, 359, and 1751; and 43 U.S.C. 1732(b), 1733, and 1740.

### Source

Source: 81 FR 81421, Nov. 17, 2016, unless otherwise noted.