G REQUIRMENTS FOR BRANCH LINES SUPPLYING MULTIPLE REGULATORS AND / OR METERS. 3 and Gas Blue Book
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1 LAST REVIEW DATE: REVIEW CYCLE: 12/4/12 5 Years SPECIFICATION: G TITLE: REQUIRMENTS FOR BRANCH LINES VOLUME: 3 and Gas Blue Book REVISIONS: (See ) This specification is being issued for the first time. -64B-
2 G Gas Operations Standards TITLE: REQUIRMENTS FOR BRANCH LINES AND /OR METERS TABLE OF CONTENTS SECTION TITLE PAGE 1.0 SCOPE LEGAL REQUIREMENTS RESPONSIBILITY DEFINITIONS GENERAL REQUIREMENTS LOW PRESSURE SERVICE INSTALLATIONS WITH MULTIPLE METERS DOWNSTREAM OF THE HEAD OF SERVICE VALVE 7.0 MEDIUM AND HIGH PRESSURE SERVICE INSTALLATIONS WITH MULTIPLE METERS DOWNSTREAM OF A SINGLE REGULATOR 8.0 MEDIUM AND HIGH PRESSURE SERVICE INSTALLATIONS WITH MULTIPLE REGULATORS DOWNSTREAM OF THE HEAD OF SERVICE VALVE ENVIRONMENTAL REVIEW BY: N. Giraldi SAFETY REVIEW BY: N. Giraldi PREPARED BY: APPROVED BY: DATE: VOLUME: 3 PAGE 1 OF E. Onyeukwu Liliana Gonzalez General Manager Technical Operations 12/4/12 ing Specs and 5
3 1.0 SCOPE This specification details the requirements for branch lines supplying multiple meters. This specification does not apply to banks of meters supplying residential loads. 2.0 LEGAL REQUIREMENTS None. 3.0 RESPONSIBILITY New business customers are responsible for complying with this specification for all branch lines supplying multiple meter sets. These requirements are in addition to the requirements specified for the specific type of meter or regulator being installed. 4.0 DEFINITIONS Trunk line - The gas pipe upstream of the branch lines supplying multiple meters and/or regulators. line The gas pipe that is supplied by a trunk line to feed a regulator or meter. 5.0 GENERAL REQUIREMENTS 5.1 Lockable valves shall be ¼ turn, tamper-proof valves. 5.2 Only approved valves listed in Table III of the Con Edison Blue Book shall be used. NUMBER: DATE: VOLUME: 3 PAGE 2 ing Specs and
4 6.0 LOW PRESSURE SERVICE INSTALLATIONS WITH MULTIPLE METERS DOWNSTREAM OF THE HEAD OF SERVICE VALVE Low pressure service installations with multiple meters downstream of the head of service valve shall meet the following requirements: 1 Head of Service Valve The trunk line shall be the same size as or larger than the head of service valve. 6.2 Each branch line and lockable valve shall be the same pipe diameter as the gas meter it is feeding. 6.3 For diaphragm and rotary meters, the lockable valve and meter shall be within 5 feet of the trunk line. For turbine meters, the lockable valve shall be within 5 feet of the trunk line and the minimum distance of the turbine meter to the lockable valve shall be as indicated in Attachment A. NUMBER: DATE: VOLUME: 3 PAGE 3 ing Specs and
5 7.0 MEDIUM AND HIGH PRESSURE SERVICE INSTALLATIONS WITH MULTIPLE METERS DOWNSTREAM OF A SINGLE REGULATOR Medium and high pressure service installations with multiple meters downstream of a single regulator shall meet the following requirements: 1 Regulator 2 3 NOTE: Please refer to Section VI of the Con Edison Gas Blue Book for additional requirements where gas piping inside buildings operates in excess of 15 psig. 7.1 The trunk line shall be the size of the largest meter diameter plus one pipe diameter (see table below). Largest Size Size 1-1/2 inch 2 inch 2 inch 3 inch 3 inch 4 inch 4 inch 6 inch 6 inch 8 inch 8 inch and above Consult Gas Measurement 7.2 Each branch line and lockable valve shall be the same pipe diameter as the gas meter it is feeding. 7.3 For diaphragm and rotary meters, the lockable valve and meter shall be within 5 feet of the trunk line. For turbine meters, the lockable valve shall be within 5 feet of the trunk line and the minimum distance of the turbine meter to the lockable valve shall be as indicated in Attachment A. 7.4 For industrial regulator installations and for parallel twin regulator NUMBER: DATE: VOLUME: 3 PAGE 4 ing Specs and
6 installations, the trunk line shall be deemed to begin immediately after the point where the regulator piping runs tie back together. 8.0 MEDIUM AND HIGH PRESSURE SERVICE INSTALLATIONS WITH MULTIPLE REGULATORS DOWNSTREAM OF THE HEAD OF SERVICE VALVE Medium and high pressure service installations with multiple regulators downstream of the head of service valve shall meet the following requirements: Reg 1 Head of Service Valve Reg 2 No more than 5 feet Reg 3 NOTE: Please refer to Section VI of the Con Edison Gas Blue Book for additional requirements where gas piping inside buildings operates in excess of 15 psig. 8.1 The trunk line shall be the same size as or larger than the head of service valve. 8.2 Each branch line and lockable valve shall be the same pipe diameter as the gas regulator it is feeding. 8.3 The lockable valve and regulator shall be within 5 feet of the trunk line. 8.4 The piping downstream of the regulator shall be the same size as the meter. NUMBER: DATE: VOLUME: 3 PAGE 5 ing Specs and
7 ATTACHMENT A Minimum Distance Between Turbine & Turbine Minimum Distance AAT-18 (4") 40" AAT-35 (6") 60" AAT-60 (8") 80" AAT-120 (12") 120" Attachment A Page 1 of 1 G-703-0
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