NB/T 11434.2-2023Paste filling in coal mine - Part 2: General technical conditions of pipe valves (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

This document is part 2 of NB/T 11434 Paste filling in coal mines. NB/T 11434 has been published in the following parts.

--- Part 1: Technical requirements for isolation of goaf areas in fully mechanized mining working faces;

--- Part 2: General technical requirements for pipes and valves;

--- Part 3: Effect evaluation method;

--- Part 5: Technical requirements for cementitious materials.

Introduction

NB/T 11434 is a standard for coal mine filling mining jointly issued by the National Energy Administration, the Ministry of Finance, the Ministry of Land and Resources, and the Ministry of Environmental Protection.

Based on the document "Guiding Opinions on Coal Production", in order to promote the reform of coal production mode, solve the problems of "three under" (under buildings, under railways, under water bodies, etc.) coal pressure and it is compiled to address the mining issues of marginal coal and residual coal, improve the level of coal resource development and utilization, improve the mining environment, and promote the healthy development of the coal industry.

This document provides standardized guidance for coal mining enterprises implementing paste filling mining. Other contents will be adjusted according to the implementation of the standard in the future.

It is supplemented that this document is intended to consist of six parts.

--- Part 1: Technical requirements for isolation of goaf in fully mechanized mining working faces. The purpose is to Effectively isolate the goaf during filling to prevent slurry leakage and slurry leakage accidents caused by unsatisfactory isolation, which would threaten the filling opening.

The mining is carried out safely to ensure the filling effect.

--- Part 2: General technical requirements for pipes and valves. The purpose is to standardize the design and selection of pipes and valves for coal mine paste filling and ensure that the filling pipes the installation and use of key pipe valves at the road connection are reliable, which is conducive to the safe transportation of coal mine filling materials.

--- Part 3: Effect evaluation method. The purpose is to summarize the filling mining system and process, various filling parameters and surface deformation observation.

Measure the value and judge whether the filling mining meets the design requirements.

--- Part 4: Technical requirements for aggregates. The purpose is to standardize the classification, selection and use of aggregates for paste filling.

It provides a basis for system design, selection of key equipment, and preparation of paste filling materials.

--- Part 5: Technical requirements for cementitious materials. The purpose is to standardize the types and technical requirements of cementitious materials used for paste filling, and ensure Paste pipeline transportation safety, underground filling body connection and filling body strength design requirements.

--- Part 6: Technical requirements for support in the waiting area. The purpose is to improve the standardization and reliability of support in the waiting area and to ensure the safety of personnel in the waiting area.

Operation safety and ventilation system reliability; clarify the support methods, design requirements, and operation processes of the waiting area to reduce the subsidence of the roof before filling.

Improve the surface control effect, reduce the difficulty of working face roof management; ensure the integrity of the roof in the charging area, thereby improving the isolation effect and work efficiency.

Coal mine paste filling Part 2: General technical requirements for pipes and valves

1 Scope

This document specifies the structural type and specifications, technical requirements, testing methods, inspection and judgment rules, products and Marking, protection, packaging, storage and maintenance.

This document applies to all types of pipeline valves used for coal mine paste filling.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.

GB/T 699 High-quality carbon structural steel GB/T 1047 Definition and selection of nominal sizes of piping components GB/T 1048 Definition and selection of nominal pressure of pipeline components GB/T 1220 Stainless Steel Bars GB/T 3032 Marking of marine valves and piping accessories GB/T 12224 General requirements for steel valves GB/T 12229 Technical requirements for carbon steel castings for general valves GB/T 12230 Technical requirements for stainless steel castings for general valves GB/T 13927 Industrial valve pressure test JB/T 7248 Technical Specifications for Low Temperature Steel Castings for Valves

3 Terms and definitions

The following terms and definitions apply to this document.

Full-opening valve

A valve in which the inner diameter of the flow path in all parts of the valve is the same as the inner diameter of the nominal pipe.

Leakage permeability the total amount of leakage of paste filling materials under the pipe and valve design strength and sealing test.

Reversing valve

A device used to quickly switch the flow direction of paste.

Flow regulating valve A device used to regulate the flow of paste in a pipeline.