GB/T 16508.5-2022 English PDF (GBT16508.5-2022)

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GB/T 16508.5-2022: Shell boilers - Part 5: Safety appurtenances and instruments
GB/T 16508.5-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.060.30
CCS J 98
Replacing GB/T 16508.5-2013
Shell boilers - Part 5: 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, definitions and symbols ... 8
4 Basic requirements ... 9
5 Safety valve ... 9
6 Pressure measuring device ... 15
7 Water level measuring device ... 16
8 Temperature measuring device ... 18
9 Sewage and water discharge device ... 19
10 Safeguards and other devices ... 20
Bibliography ... 24
Shell boilers - Part 5: Safety appurtenances and instruments
1 Scope
This document specifies the requirements for safety appurtenances and instruments of
shell boilers, including safety valves, pressure measuring devices, water level
measuring devices, temperature measuring devices, sewage and water discharge
devices, safety protection and other devices.
This document applies to the safety appurtenances and instruments selected for shell
boilers defined in GB/T 16508.1.
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 2900.48, Electrotechnical terminology of boilers
GB/T 12241, Safety valves - General requirements
GB/T 16508.1, Shell boilers - Part 1: General requirements
GB/T 16508.3, Shell boilers - Part 3: Design and strength calculation
GB/T 36699, Specification for liquid fuels and gaseous fuels burners of boilers
NB/T 47063, Safety valves for power station
3 Terms, definitions and symbols
For the purposes of this document, the terms and definitions defined in GB/T 2900.48
and GB/T 16508.1 as well as the followings apply.
3.1 set pressure of safety valve
The set pressure at which a safety valve begins to open under operating conditions.
3.2 ignition safety time
The safety time for burner ignition flame to ignite. That is, when no ignition flame is
formed, the time interval between the ignition fuel control valve getting the opening
signal and the closing signal.
3.3 extinction safety time
When the burner is running, the time interval from when the flame detection device
sends out the signal of flame extinguishment to when the safety shut-off valve starts to
close.
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 relevant product standards.
4.3 All necessary parts required by boiler drawings and technical documents shall be
equipped with measuring devices such as pressure, water level and temperature. The
measuring device shall have an appropriate range and be safe and reliable. The
measured values shall be accurate enough. Configure local and remote pressure, water
level and temperature measuring devices according to the requirements of this
document.
4.4 The calibration and maintenance of measuring instruments shall comply with the
regulations of the national metrology management department.
5 Safety valve
5.1 Quantity and type
5.1.1 Each boiler shall be 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 0.5 t/h;
b) Steam boilers with rated evaporation less than 2 t/h and equipped with reliable
overpressure interlock protection device;
c) Hot water boilers with a rated heating power no greater than 2.8 MW.
5.1.2 Steam boilers shall adopt full-open spring safety valves, lever safety valves or
control safety valves (including pulse type, pneumatic type, hydraulic type and
electromagnetic type, etc.). The hot water boiler can use a micro-opening safety valve.
The selected safety valve shall meet the requirements of the corresponding technical
transmission system.
5.4.7 The safety valve exhaust pipe of the steam boiler meets the following
requirements.
a) Steam boiler safety valve shall be equipped with exhaust pipe. The exhaust pipe
shall lead directly to a safe place. There shall be enough flow cross-sectional area.
Ensure smooth exhaust. At the same time, the exhaust pipe shall be fixed. Avoid
affecting the correct action of the safety valve due to thermal expansion or exhaust
steam reaction. There shall not be any external force from the exhaust pipe
applied to the safety valve.
b) The exhaust pipes of two independent safety valves shall not be connected.
c) The exhaust pipe arranged in the open air shall be equipped with a protective cover.
The installation of the protective cover shall not hinder the normal operation and
maintenance of the safety valve.
d) When the exhaust pipe of the safety valve is equipped with a muffler, its structure
shall have a sufficient flow cross-sectional area. There must be a suitable bracket
and a reliable hydrophobic device.
e) The bottom of the exhaust pipe of the safety valve shall be equipped with a
drainpipe connected to a safe place. Valves shall not be installed on discharge
pipes and drainpipes.
5.4.8 The safety valve of the hot water boiler shall be equipped with a discharge pipe.
The discharge pipe shall lead directly to a safe place. There is enough discharge flow
area to ensure smooth discharge. Valves shall not be installed on the discharge pipe.
Antifreeze measures shall be taken.
5.5 Use and verification
5.5.1 After the safety valve is installed (including maintenance and replacement), its set
pressure and tightness shall be verified. For the control type safety valve, the reliability
test of the control circuit and the opening performance test shall be carried out,
respectively.
5.5.2 After the safety valve is verified, it shall be locked or sealed. The inspection results
of the set pressure and tightness shall be recorded in the boiler safety technical file.
5.5.3 During the operation of the boiler, the safety valve shall not be disconnected
arbitrarily; the set pressure of the safety valve shall not be increased arbitrarily, or the
safety valve shall not be invalidated.
5.5.4 During the operation of the boiler, the discharge test of the safety valve shall be
carried out regularly. For control type safety valves, the control system shall be tested
regularly.
5.5.5 In-use boiler safety valves are verified at least once a year. Verification is generally
carried out when the boiler is running. If the on-site verification is difficult or after the
safety valve is repaired, it can be carried out on the safety valve verification platform.
The verified safety valve shall not be dropped, smashed or collided during
transportation or installation.
6 Pressure measuring device
6.1 Each boiler shall be equipped with pressure gauges at the following locations:
a) in the steam space of the steam boiler shell (drum);
b) before the feed water regulating valve;
c) at the outlet of the economizer;
d) between superheater ...