GB/T 16508.5-2013 English PDF (GBT16508.5-2013)

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GB/T 16508.5-2013: Shell boilers – Part 5: Safety appurtenances and instruments
GB/T 16508.5-2013
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.060.30
J 98
Shell Boilers -- Part 5: Safety Appurtenances and
Instruments
ISSUED ON: DECEMBER 31, 2013
IMPLEMENTED ON: JULY 1, 2014
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 5
4 Basic Requirements ... 5
5 Safety Valves ... 6
6 Pressure Measuring Device ... 12
7 Water Level Measuring Device ... 14
8 Temperature Measuring Device ... 16
9 Blowdown and Drainage Device ... 17
10 Safety Protection Devices ... 18
11 Monitoring and Metering Instrument ... 22
12 Other Requirements ... 23
Shell Boilers -- Part 5: Safety Appurtenances and
Instruments
1 Scope
This Part of GB/T 16508 specifies the requirements of setting and selecting etc. for
safety appurtenances and instruments of shell boilers, including safety valve, pressure
measuring device, water level measuring device, temperature measuring device,
blowdown and drainage device and safety protection system.
This Part is applicable to the shell boilers defined within the scope of GB/T 16508.1.
2 Normative References
The following documents are essential for the application of this document. For dated
reference, only the edition cited applies. For undated references, the latest edition
(including any amendments) applies.
GB/T 1576 Water Quality for Industrial Boilers
GB/T 12145 Quality Criterion of Water and Steam for Generating Unit and Steam
Power Equipment
GB/T 12241 Safety Valves - General Requirements
GB 13271 Emission Standard of Air Pollutants for Coal-burning Boilers
GB 50041 Code for Design of Boiler Plant
TSG G0001 Boiler Safety Technical Supervision Administration Regulation
TSG G0002 Supervision Administration Regulation on Energy Conservation
Technology for Boiler
TSG ZF 001 Safety Valve - Safety Technical Supervision Administration
Regulation
operation of boilers.
4.2 All necessary parts as required in drawings and technical documents of boilers
shall be equipped with measuring devices for pressure, water level and temperature.
All those devices shall be safe, reliable and accurate and be provided with proper
measuring range and local and remote transmission measuring devices for pressure,
water level and temperature as required in regulations.
5 Safety Valves
5.1 Basic requirements
5.1.1 Technical requirements for the manufacturing license of safety valves, product
type test, nameplate and quality certificate shall be in accordance with those specified
in TSG ZF 001 Safety Technical Supervision Regulation for Safety Valve.
5.1.2 Each boiler shall be installed with at least two safety valves (including boiler
drum and superheater safety valve). In case of any of the following conditions, only
one safety valve may be installed:
a) The steam boiler whose rated evaporation is less than or equal to 0.5t/h;
b) The steam boiler with a reliable overpressure interlock protection device and
rated evaporation less than 4t/h;
c) Hot water boiler with a rated thermal power less than or equal to 2.8MW.
5.2 Selection of safety valve
5.2.1 For safety valve of steam boilers, fall-lift spring safety valve, lever safety valve
or controlled safety valves (pulsed safety valve, pneumatic safety valve, hydraulic
safety valve and electromagnetic safety valve etc.) shall be adopted and all these
valves selected shall meet those specified in TSG ZF 001 Safety Technical Supervision
Regulation for Safety Valve and the requirements of corresponding technical standards.
5.2.2 For steam boilers whose rated operating pressure is less than or equal to
0.1MPa, dead weight safety valve or water-sealed safety equipment may be adopted.
In case that hot water boiler is equipped with water-sealed safety equipment, safety
valve may not be installed. The inner diameter of sealing water tube for water-sealed
safety equipment shall be determined in accordance with the rated evaporation (rated
thermal power) and rated operating pressure of boilers and no less than 25mm. The
sealing water tubes of water-sealed safety equipment shall not be provided with valves,
but anti-freezing measures.
less than 0.3MPa, the maximum opening/closing pressure difference is 0.03MPa.
5.6 Installation of safety valve
5.6.1 The safety valve shall be installed vertically at the highest position of the shell
and header; pipelines and valves for taking steams or hot water shall not be installed
between the safety valve and the shell or between the safety valve and the header.
5.6.2 If several safety valves are installed together at a short tube that is directly
connected with the shell, the flow sectional area of the tube shall be no less than the
sum of the flow sectional areas of all safety valves.
5.6.3 Where the threaded spring safety valve is adopted, the requirements specified
in GB/T 12241 shall be met. The safety valve shall be connected with the short tube
with threads while the welded structure shall be adopted to connect the short tube with
the shell or the header drum.
5.7 Devices on the safety valve
5.7.1 The basic requirements are as follows:
a) The dead weight safety valve shall be provided with devices to prevent the
weight piece from flying off;
b) The spring safety valve shall be provided with a lifting handle and a device to
prevent the screw from adjustment by random twisting;
c) The lever safety valve shall be provided with a device to prevent the heavy
punch from moving automatically and a guide bracket to prevent the lever
moving out.
5.7.2 The controlled safety valve shall be provided with reliable power source and
power supply, and meet the following requirements:
a) Impulse of the impulse safety valve is connected to the valve on the duct and it
shall be kept fully open and sealed with lead;
b) The safety valve controlled by compressed air is provided with reliable air
supply and power supply;
c) The hydraulic safety valve is provided with reliable hydraulic transfer system
and power supply;
d) The electromagnetic safety valve is provided with reliable power supply.
5.10.5 The inspection results such as the set pressure and airtightness of the safety
valve shall be recorded into the boiler safety technology file.
5.11 Application of the safety valve during the operation of boiler
5.11.1 During the operation of boiler, the discharge test shall be carried out
periodically. For controlled safety valve, the users shall carry out periodical test for the
control system.
5.11.2 During the operation of boiler, it is forbidden that the safety valve be
disconnected and set pressure increased randomly or the valve invalid.
6 Pressure Measuring Device
6.1 Setting
6.1.1 Pressure gauges shall be installed:
a) At the steam space of the steam boiler shell (drum);
b) In front of the feedwater control valve;
c) At the economizer outlet;
d) Between the superheater outlet and the main steam valve;
e) On the shell (drum) of hot water boiler;
f) At the outlet of the inflow valve and at the inlet of the outflow valve for the hot-
water boiler;
g) At the circulating water pump outlet/ inlet of the hot-water boiler;
h) At the oil pump inlet (return oil) and outlet of the ignition oil system for the oil-
fired boiler and coal-fired boiler;
i...