---
kind: "section"
citation: "43 C.F.R. § 3174.9"
title: "43"
number: "3174.9"
heading: "Coriolis measurement systems (CMS)—general requirements and components."
url: "https://uscodex.org/cfr/43/3174.9"
---

# §3174.9. Coriolis measurement systems (CMS)—general requirements and components.


The following Coriolis measurement systems section is intended for Coriolis measurement applications independent of LACT measurement systems.

- (a) A CMS must meet the requirements and minimum standards of this section, [§ 3174.4](/cfr/43/3174.4.md), and [§ 3174.10](/cfr/43/3174.10.md).
- (b) The specific makes, models, and sizes of Coriolis meters and associated software that have been reviewed by the PMT, as provided in [§ 3174.13](/cfr/43/3174.13.md), approved by the BLM, and identified and described at www.blm.gov are approved for use.
- (c) A CMS system must be proven at the frequency and under the requirements of [§ 3174.11](/cfr/43/3174.11.md) of this subpart.
- (d) Measurement tickets must be completed under [§ 3174.12(b)](/cfr/43/3174.12.md?p=b) of this subpart.
- (e) A CMS at an FMP must be installed with the components listed in API 5.6 (incorporated by reference, see [§ 3174.3](/cfr/43/3174.3.md)). Additional requirements are as follows:
  - (1) The pressure transducer must meet the requirements of [§ 3174.8(b)(5)](/cfr/43/3174.8.md?p=b-5) of this subpart.
  - (2) Temperature determination must meet the requirements of [§ 3174.8(b)(6)](/cfr/43/3174.8.md?p=b-6) of this subpart.
  - (3) If nonzero S&W content is to be used in determining net oil volume, the sampling system must meet the requirements of [§ 3174.8(b)(1) through (3)](/cfr/43/3174.8.md?p=b-1..b-3) of this subpart. If no sampling system is used, or the sampling system does not meet the requirements of [§ 3174.8(b)(1) through (3)](/cfr/43/3174.8.md?p=b-1..b-3) of this subpart, the S&W content must be reported as zero;
  - (4) Sufficient back pressure must be applied to ensure single phase flow through the meter.
- (f) **Determination of API oil gravity.** The API oil gravity reported for the measurement ticket period must be determined by one of the following methods:
  - (1) Determined from a composite sample taken pursuant to [§ 3174.8(b)(1) through (3)](/cfr/43/3174.8.md?p=b-1..b-3) of this subpart; or
  - (2) Calculated from the average density as measured by the CMS over the measurement ticket period under API 21.2, Subsection 9.2.13.2a (incorporated by reference, see [§ 3174.3](/cfr/43/3174.3.md)). Density must be corrected to base temperature and pressure using API 11.1 (incorporated by reference, see [§ 3174.3](/cfr/43/3174.3.md)).
- (g) **Determination of net standard volume.** Calculate the net standard volume at the close of each measurement ticket following the guidelines in API 12.2.1 and API 12.2.2 (both incorporated by reference, see [§ 3174.3](/cfr/43/3174.3.md)).

## Notes

### Source

Source: 81 FR 81504, 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.