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Standard No.: GB/T 16507.7-2022
Language: Chinese, Available in English version
Release Date: 2022
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 16507.7-2022
Replace: GB/T 16507.7-2013

Scope: This document specifies the requirements for safety accessories and instruments of water tube boilers, including safety valves, pressure measuring devices, water (liquid) level measurement and display control devices, temperature measuring devices, sewage discharge and water discharge devices, and protection devices. This document is applicable to the safety accessories and instruments selected for water tube boilers defined in GB/T16507.1.

Introduction

Key points of the core revision of the standard

Technical elements	Requirements of the 2013 version	Changes in the 2022 version
Safety valve type	Power-driven pressure relief valve is not specified	New definition in Article 3.7, allowing it to be used as an overpressure protection device
Direct current boiler safety valve	Combined displacement ratio is not specified	It is clarified that the displacement of the power-driven pressure relief valve accounts for 10-30% (5.2.6)
Interlock protection power supply	No backup power supply management requirements	Added Article 10.30 that the backup power supply cannot be withdrawn at will

Safety accessories configuration requirements

1. Safety valve system

Based on the working pressure difference of water tube boilers:

Steam boilers must be equipped with ≥2 full-lift spring safety valves (5.1.1)
Hot water boilers are allowed to use micro-lift safety valves. When the rated power is ≤2.8MW, only one valve can be installed (5.1.1c)
0.1MPa low-pressure boilers can use static weight safety valves or water seal devices (5.1.4)

2. Pressure monitoring system

Case: A boiler in a power station burst due to a pipe failure due to the lack of a pressure gauge at the economizer outlet. Article 6.1c of the new standard clearly requires that a pressure gauge must be installed at the economizer outlet (except for drum boilers).

Key technical innovations

1. Optimization of safety valve displacement calculation

Standard 5.2.8 provides three methods for calculating the displacement:

Data provided by the manufacturer
Use the K-factor correction formula: E=0.235A(10.2p+1)K
According to the special formula of NB/T47063

2. Digital protection system

Article 10.10 recommends the use of a SIL3 safety-related system, which must comply with the following:

Independent redundant controller
Physically isolated I/O channels
Prohibition of communication bus transmission of tripping commands

Implementation suggestions

1. Design stage

For direct-current boilers, the displacement ratio of the power-driven pressure relief valve and the safety valve needs to be calculated (5.2.6)
Circulating fluidized bed boilers should be equipped with a bed temperature and bed pressure interlock system (10.25)

2. Operation and maintenance

Test the automatic switching function of the backup power supply every month (10.30)
Flush and calibrate the water level meter every shift (7.2.5)

GB/T 16507.7-2022 Referenced Document

DL/T 5428 Design code for thermal protection system of thermal power plant*， 2023-02-06 Update
GB 50116 Code for design of automatic fire alarm system
GB 50229 Design Fire Protection Standards for Thermal Power Plants and Substations
GB/T 12228 General purpose industrial valves.Specification of carbon steel forgings
GB/T 12229 General Purpose industrial valves.Specification of carbon steel castings
GB/T 12230 Specifications for stainless steel castings for general valves*， 2023-05-23 Update
GB/T 12241 Safety valves—General requirements
GB/T 12242 Pressure relief devices—Performance test code
GB/T 1239.2 Cold coiled helical springs technical specifications.Part 2:Compressions spring
GB/T 16507.1 Water-tube boilers—Part 1: General requirements
GB/T 16507.2 Water-tube boilers—Part 2: Materials
GB/T 16507.4 Water-tube boilers—Part 4: Strength calculation of pressure parts
GB/T 23934 Hot formed helical compression springs—Technical requirement
NB/T 47063 Power station safety valve

GB/T 16507.7-2022 history

2022 GB/T 16507.1-2022 Water-tube boilers—Part 1: General requirements
2013 GB/T 16507.1-2013 Water-tube boilers.Part 1:General requirement
1996 GB/T 16507-1996 Rules for construction of stationary boilers

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GB/T 16507.7-2022