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Interpretation Response #11-0311 ([Weatherford International] [Mr. Tim Redwine])

Below is the interpretation response detail and a list of regulations sections applicable to this response.

Interpretation Response Details

Response Publish Date:

Company Name: Weatherford International

Individual Name: Mr. Tim Redwine

Location State: TX Country: US

View the Interpretation Document

Response text:

February 10, 2012


Mr. Tim Redwine
Weatherford International
495 Winscott Road
Fort Worth, Texas 761256

Reference No.: 11-0311

Dear Mr. Redwine:

This responds to your letter requesting clarification of Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180) applicable to limited quantities of compressed gases. In your incoming letter, you describe an accumulator system that functions as part of a natural gas or oil drilling rig. You also include a picture of this accumulator system. You ask whether this accumulator system, as shown in the picture, is excepted from the HMR as specified in § 173.306(f).

The answer is yes. In accordance with § 173.306(f)(1), provided the accumulator system is installed in either a motor vehicle, construction equipment, or assembled machinery and is designed and fabricated with a burst pressure of not less than five times their charged pressure at 70 °F., the accumulator system would not be subject to any other requirements of the HMR. As described in your incoming letter and shown in the accompanying picture, this accumulator system meets the requirements specified in § 173.306(f)(1) and is excepted from the HMR.

I trust this satisfies your inquiry. Please contact us if we can be of further assistance.



T. Glenn Foster
Chief, Regulatory Review and Reinvention Branch
Standards and Rulemaking Division


Regulation Sections

Section Subject
173.306 Limited quantities of compressed gases