GB/T 16507.7-2022 English PDF (GBT16507.7-2022)

Delivery: 3 seconds. Download true-PDF + Invoice.
Get QUOTATION in 1-minute: Click GB/T 16507.7-2022
Historical versions: GB/T 16507.7-2022
Preview True-PDF (Reload/Scroll if blank)

GB/T 16507.7-2022: Water-tube boilers - Part 7: Safety appurtenances and instruments
GB/T 16507.7-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.060.30
CCS J 98
Replacing GB/T 16507.7-2013
Water-tube boilers - Part 7: Safety appurtenances and
instruments
ISSUED ON: MARCH 09, 2022
IMPLEMENTED ON: OCTOBER 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 6
1 Scope ... 8
2 Normative references ... 8
3 Terms and definitions ... 9
4 Basic requirements ... 10
5 Safety valve ... 10
6 Pressure measuring device ... 19
7 Water level measurement and display control device ... 21
8 Temperature measuring device ... 23
9 Blowdown and water emission device ... 24
10 Alarm and protection devices ... 25
11 Other appurtenances ... 35
Bibliography ... 37
Water-tube boilers - Part 7: Safety appurtenances and
instruments
1 Scope
This document specifies the requirements for safety appurtenances and instruments of
water-tube boilers, including safety valves, pressure measuring devices, water (liquid)
level measurement and display control devices, temperature measuring devices,
blowdown emission and water emission devices, and protection devices.
This document is applicable to the safety appurtenances and instruments selected for
water-tube boilers defined in GB/T 16507.1.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 1239.2, Cold coiled helical springs technical specifications - Part 2:
Compressions spring
GB/T 12228, General purpose industrial valves - Specification of carbon steel
forgings
GB/T 12229, General purpose industrial valves - Specification of spheroidal
graphite iron castings
GB/T 12230, General purpose industrial valves - Specification of stainless steel
castings
GB/T 12241, Safety valves - General requirements
GB/T 12242, Pressure relief devices - Performance test code
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 20438 (all parts), Functional safety of electrical/electronic/programmable
electronic safety-related systems
GB/T 21109 (all parts), Functional safety of safety instrumented systems in the
process industry sector
GB/T 23934, Hot formed helical compression springs - Technical Requirement
GB 50116, Code for design of automatic fire alarm system
GB 50229, Standard for design of fire protection for fossil fuel power plants and
substations
DL/T 5428, Technical code for design of IC protection system in fossil fuel power
plant
NB/T 47063, Safety valves for power station
3 Terms and definitions
The following terms and definitions defined in GB/T 16507.1 apply to this document.
3.1 instrument
A device used alone or in combination with other equipment to make measurements.
3.2 quencher
The equipment that uses air or water to cool the slag emission at the bottom of the
circulating fluidized bed boiler.
3.3 bed temperature
The temperature of the gas-solid two-phase flow in the dense phase zone of the
circulating fluidized bed boiler.
3.4 bed pressure
The pressure difference obtained by subtracting the resistance of the air distribution
plate from the pressure difference between the lower air chamber of the circulating
fluidized bed boiler air distribution plate and the furnace outlet.
3.5 safety valve
Valves that protect pipelines or equipment.
NOTE: When the medium pressure in the pipeline or equipment exceeds the specified value, the
opening-closing parts (disc) will automatically open to emission the medium. When it is lower than
the specified value, the opening-closing parts (disc) will automatically close.
3.6 relief valve
An automatic pressure relief device.
NOTE: Its action is controlled by the static pressure on the inlet side of the valve. Its opening
increases with the increase of the opening pressure. It is mainly used for incompressible media.
3.7 power operated pressure relief valve
A valve whose opening or closing action is controlled entirely by a power source
(electric, pneumatic, hydraulic or pulse).
NOTE: It is a kind of controlled safety valve.
3.8 set pressure of safety valve
The set pressure at which a safety valve begins to open under operating conditions.
4 Basic requirements
4.1 The safety appurtenances and instruments configured by the boiler shall meet the
requirements for safe and reliable operation of the boiler.
4.2 The safety appurtenances and instruments configured by the boiler shall meet the
requirements of product standards.
4.3 The calibration and maintenance of measuring instruments shall comply with the
regulations of the national metrology department.
4.4 The pressure, water level and temperature measuring devices configured by the
boiler shall be installed in all necessary places. They shall be properly ranged and
reliable. The measurement value shall have enough precision.
5 Safety valve
5.1 Number and type of safety valve
5.1.1 Each boiler is equipped with at least two safety valves (including drum and
superheater safety valves). Only one safety valve may be installed if one of the
following requirements is met:
a) Steam boilers with rated evaporation not greater than 0.5t/h;
b) Steam boilers with rated evaporation less than 2t/h and equipped with reliable
overpressure interlock protection device;
such that when all the safety valves on the boiler are fully opened, the pressure inside
the boiler shall not exceed 1.1 times the calculated pressure.
5.2.3 The proportion of the emission of the superheater outlet safety valve to the total
emission shall ensure that the superheater can be cooled sufficiently when the safety
valve is opened.
5.2.4 For hot water boilers whose rated outlet water temperature is not less than 100°C,
the maximum steam production (Ev) of the boiler at the rated thermal power shall be
determined according to the formula (1):
Where,
Ev - the maximum steam output of the boiler at rated thermal power, in kilograms per
hour (kg/h);
Q - the rated thermal power of the boiler, in megawatts (MW);
Δi - the enthalpy increase, in kilojoules per kilogram (kJ/kg), which is equal to the
difference between saturated steam enthalpy and feedwater enthalpy at rated pressure.
5.2.5 The total emission of the reheater safety valve shall be greater than the maximum
design steam flow of the reheater. The emission of the safety valve at the outlet shall
ensure that the reheater can be cooled sufficiently when the safety valve is fully opened.
5.2.6 The total emission of the safety valve of the external start-up (steam-water)
separator of the DC steam boiler shall be greater than the steam production when the
DC steam boiler starts. The combined emission of the DC steam boiler safety valve and
power operated pressure relief valve (no valve at the inlet) shall be greater than the
maximum continuous evaporation capacity of the boiler. Among them, the proportion
of the emission of the power operated pressure relief valve shall not be greater than 30%
of the maximum continuous evaporation of the boiler. The emission ...