SY/T 6150.1-2024 Specification for tapping & plugging on steel pipeline-Part 1:Plug stopple & barrel stopple English, Anglais, Englisch, Inglés, えいご
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ICS
E
Professional standard of the People's Republic of China
SY/T 6150.1-2024
Replaces SY/T 6150.1-2017
Specification for tapping & plugging on steel pipeline - Part 1: Plug stopple & barrel stopple
钢质管道封堵技术规范 第1部分：塞式、筒式封堵
(English Translation)
Issue date: 2024-12-25 Implementation date: 2025-06-25
Issued by National Development and Reform Commission, P.R.C
Contents
Foreword
Introduction
1 Scope
2 Normative References
3 Terms and Definitions
4 General Provisions
5 Preparation for Plugging Construction
5.1 Survey and Reconnaissance
5.2 Process Selection
5.3 Selection of Split Tee or Split 4-Way Fitting
5.4 Verification of Materials and Tools
5.5 Simulation Test
5.6 Welding Procedure and Qualification
5.7 Construction Site Requirements
5.8 Determination of Work Pit Dimensions
5.9 Erection of Work Platform
6 Assembly and Welding of Split Tee or Split 4-Way Fitting
6.1 Selection of Operation Point
6.2 Welding
7 Plugging Construction Operations
7.1 Installation
7.2 Hot-Tapping Operation
7.3 Plugging Operation
7.4 Isolation
7.5 Pipe Cutting
7.6 Hot Tie-In
7.7 Plugging Release
7.8 Removal of Bypass Pipeline
7.9 Installation of Plug in Split Tee or Split 4-Way Fitting
7.10 Removal of Plug from Split Tee or Split 4-Way Fitting
7.11 Installation of Blind Flange
7.12 Anti-corrosion and Ground Restoration
8 Health, Safety, Environment
8.1 General Requirements
8.2 Health Monitoring
8.3 Safety Protection
8.4 Environmental Protection
9 Handover Documents
Appendix A (Informative) Format of Pipeline Survey Form
Appendix B (Informative) Procedure for Mechanical Plugging Operation on In-service Pipelines
Appendix C (Informative) Format of Welding Inspection Record
Appendix D (Informative) Pressure Test Form for Bypass Pipeline
Appendix E (Informative) Dimensional Record and Calculation Table for Hot-Tapping, Plugging, Plug Installation, and Plug Removal
Appendix F (Informative) Inspection Table for Hot-Tapping Operation
Appendix G (Informative) Format of Plug Installation Record Form
Technical Specification for Pipeline Plugging of Steel Pipes — Part 1: Suspension Plug and Barrel Plug
1 Scope
This document specifies the technical requirements for plugging construction preparation, assembly and welding of split tees or split 4-way fittings, plugging construction operations, health, safety, environment, and handover documents for hot-tapping and suspension/barrel plugging operations on pipelines under pressure.
This document applies to hot-tapping and suspension/barrel plugging operations on steel pipelines.
2 Normative References
The following documents contain provisions which, through normative reference in this text, constitute essential provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 19326 Forged branch outlet fittings
GB/T 28055 Technical specification for pipeline plugging of steel pipes
GB 30871 Safety code for special operations in hazardous chemical enterprises
GB/T 31032 Welding and acceptance for steel pipelines
GB 50251 Code for design of gas transmission pipeline engineering
GB 50253 Code for design of oil transmission pipeline engineering
JGJ 130 Technical specification for safety of steel tubular scaffold in construction
SY/T 4109 Nondestructive testing of oil and gas steel pipeline
SY/T 5918 Technical specification for rehabilitation of external anti-corrosion coating and insulation layer of buried steel pipeline
SY/T 6444 Safety specification for construction of petroleum engineering
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
3.1
plugging head
A device composed of a mechanical rotating part and sealing components, used to isolate the medium inside the pipeline.
Note: Classified as suspension plugging head and barrel plugging head.
3.2
suspension plug
A plugging form where the sealing structure of the plugging head is disc-shaped.
Note: Includes suspended, folding, double-seal, hydraulically activated, and intelligent plugging, etc.
3.3
barrel plug
A plugging form where the sealing structure of the plugging head is cylindrical.
3.4
tapping machine
A device used to machine a circular hole in a pipeline by mechanical cutting while the pipeline is in a sealed state.
3.5
hot-tapping
An operation of machining a circular hole in a pipeline by mechanical cutting using tapping equipment without leakage of the pipeline medium.
3.6
plugging
An operation of sending a plugging head into the pipeline through the hot-tapped hole and sealing the pipeline, thereby isolating the medium inside the pipeline.
3.7
L-O-R split fitting
A fully surrounding special tee with a plug and ring segment mechanism at the flange, used for pipeline hot-tapping and plugging operations.
Note: Commonly classified as plugging tee, bypass tee, and bag-setting tee, etc.
3.8
L-O-R split 4-way fitting
A fully surrounding special 4-way fitting with a plug and ring segment mechanism at the flange, and a lower shield with a protruding sealing cavity, used for pipeline hot-tapping and plugging operations.
3.9
plug
A cylindrical device placed inside the flange bore of a split tee (split 4-way fitting), equipped with O-rings, a check valve, and a ring segment groove.
3.10
ring segment
A retractable mechanism placed inside the flange of a split tee or split 4-way fitting, used to secure and restrict the plug.
Note: Classified into externally driven and internally driven types.
3.11
sandwich valve
A specialized valve used for connecting hot-tapping and plugging equipment to a split tee (split 4-way fitting) during hot-tapping and plugging operations.
3.12
T.M.adapter
A device housing the cutter and plug, used for sealed connection between the sandwich valve and the tapping machine.
3.13
plugging head housing
A device housing the plugging head, used for sealed connection between the sandwich valve and the plugging machine.
3.14
cutter
A cylindrical milling cutter with multiple cutting teeth at one end and connected to the tapping machine spindle at the other end.
3.15
pilot drill
A drill bit equipped with a U-shaped retaining ring, used for positioning, guiding, retrieving the cut coupon, and assisting the cutter during hot-tapping.
3.16
centering device
A pipe fitting welded onto the pipeline, used to adjust the position of the pilot drill and ensure coaxial alignment between the pilot drill and the bore of the tee/4-way fitting.
3.17
coupon
The pipe wall section cut out by the cutter.
3.18
cutter holder
A device connecting the tapping machine and the cutter.
