NB/T 11193-2023
Turbine cylindrical valve installation and commissioning procedures (English Version)

Standard No.: NB/T 11193-2023
Language: Chinese, Available in English version
Release Date: 2023
Published By: Professional Standard - Energy
Latest: NB/T 11193-2023

Introduction

Analysis of the core content of the standard

Technical elements	Installation requirements	Debugging indicators
Simplified assembly	Roundness ≤3mm, cylindricity ≤4mm Split surface misalignment ≤0.05mm	Welding deformation ≤0.30mm
Servomotor	Verticality ≤0.20mm/m Preload deviation ±10%	Pressure test 1.25 times design pressure
Guide system	Vertical degree ≤ 0.10mm Gap meets manufacturer requirements	Full stroke synchronization deviation ≤ 5mm

Key technology implementation points

Hydraulic control system selection comparison

Chain-type mechanical control: Forced synchronization through physical chain, regular lubrication and maintenance required
Coaxial oil motor type: Using the volume balance principle, the pipeline layout requires symmetry
Fully digital integrated type: Pulse control has high accuracy and encoder zero point calibration is required

Debugging risk prevention and control

The guide vane opening needs to be kept fixed during the dynamic water closing test
The oil pressure should be increased in stages during the system oil filling stage
The sealing surface detection requires a kerosene leakage test

Background of Standard Evolution

Based on the 2018 Energy Bureau Standard Revision Plan (National Energy Comprehensive Technology [2018] No. 191), it integrates the engineering practice experience of units such as Three Gorges and Dongfang Electric, and systematically standardizes the debugging process of different control methods for the first time.

NB/T 11193-2023 Referenced Document

GB 50171 Code for construction and acceptance of switchboard outfit complete cubicle and secondary circuit electric equipment installation engineering
GB/T 8564 Technical Specifications for Installation of Hydrogenerator Sets*， 2023-11-27 Update