Standards

NB/T 11935-2025 Gas Insulated Metal Enclosed Transmission Line Design Codes

Publish Date: 2025-12-18

NB/T 11934-2025

Publish Date: 2025-12-18

NB/T 11933-2025 Design specification for electric power engineering switching machine station

Publish Date: 2025-12-18

NB/T 11932-2025 Advanced Measurement System (AMI) Design Procedures

Publish Date: 2025-12-18

NB/T 11943-2025 The method for measuring the gas content of coal seam core extracted by sealing in coal mine underground

Publish Date: 2025-12-18

NB/T 11942-2025 Design and Operating Technical Specifications for Surface Well Safety Production System in Coal Bed Methane Extraction (Empty) Area

Publish Date: 2025-12-18

NB/T 11941-2025 The technical requirements for the entire well screen pipe process of gas extraction for soft coal seams include: installing screens at the bottom of the well drilled for gas extraction, and ensuring that the screens are securely fixed in place

Publish Date: 2025-12-18

NB/T 11940-2025

Publish Date: 2025-12-18

NB/T 11939-2025 Mining gas drilling unit modular extraction monitoring device

Publish Date: 2025-12-18

NB/T 47013.21-2025 Non-destructive testing of pressure equipment - Part 21: Detection using alternating electromagnetic fields

本文件适用于承压设备金属材料焊接接头表面开口缺陷的交流电磁场检测，水下金属焊接接头交流电磁场检测和核工程用薄壁奥氏体不锈钢对接接头全壁厚交流电磁场检测。

Publish Date: 2025-12-18

NB/T 11938-2025 The determination of the radius of gas extraction from coal seams using the pressure drop method

Publish Date: 2025-12-18

NB/T 47013.8-2025 Non-destructive testing of pressure equipment - Part 8: Leakage testing

本部分适用于在制和在用承压设备的泄漏检测，可以用来确定泄漏部位和测量泄漏率

Publish Date: 2025-12-18