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U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Interpretation Response #PI-83-0106

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

Interpretation Response Details

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Location State: DC Country: US

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Response text:

PI-83-0106

No.    83-8          
Date:  August 1, 1983

DEPARTMENT OF TRANSPORTATION

RESEARCH AND SPECIAL PROGRAMS ADMINISTRATION

MATERIALS TRANSPORTATION BUREAU

________________________________________________________________________                                                                  
PIPELINE SAFETY REGULATORY INTERPRETATION
                                                                 

Note: This pipeline safety regulatory interpretation applies to all operators that are subject to the rule under Federal or State law.

SECTION: 192.179

SUBJECT: Valve spacing

FACTS: None.

QUESTION:  How far apart may sectionalizing block valves be placed on an onshore transmission line being constructed in a  Class 1 area?

INTERPRETATION:  Section 192.179(a)(4) provides that "Each point   on the pipeline in a Class 1 location must be within 10 miles of   a valve."  A spacing of not more than 20 miles between valves      will result in each point on the pipeline between valves being within 10 miles of a valve.  This allowable spacing is supported   by the language of the proposed rule (35 FR 5713; April 8, 1970) upon which §192.179 is based, which stated that "Each sectionalizing block valve on a transmission line must be installed at a spacing not to exceed 20 miles within areas conforming to Class 1 Location."

 Richard L. Beam
 Associate Director for
 Pipeline Safety Regulation
 Materials Transportation Bureau

Regulation Sections

Section Subject
192.179 Transmission line valves