GB 29550-2013General safety technique conditions for gas in civil building (English PDF)

4.1 Quality, characteristics and categories City Gas quality

4.1.1 shall comply with the provisions of GB 50494.

4.1.2 Type and town gas shall comply with GB/T 13611 of.

4.2 Supply pressure Appliance supply pressure fluctuation before

4.2.1 should be consistent with GB 50028 requirements.

4.2.2 altitudes greater than 500m area, gas appliance before the gas pressure should be amended in accordance with the gas density changes at different altitudes (H) when the low-pressure gas appliance rated pressure Pn can refer to Appendix A for adoption.

5 gas pipeline and equipment

5.1 pipe and fittings

5.1.1 pipes and fittings shall Sheet (sample), the description shall include at least the following technical content.

a) users to install. 1) to adapt to the medium (gas and cold, hot water, etc.) conditions; 2) to adapt to the ambient temperature and installation conditions; 3) maintenance and repair; 4) Other matters.

b) Technical Data. 1) material grade and code; 2) nominal size (diameter), outside or inside diameter, nominal pressure and nominal wall thickness; 3) Product labeling and performance standards; 4) Other matters.

5.1.2 quality pipes and fittings should be consistent with existing national standards. Connecting pipe and fittings shall meet the following requirements.

a) the performance of the connection pipe and fittings shall be consistent with existing national standards, connectivity should include at least

1.5 times the design pressure Tightness test strength test force and

1.0 times the design pressure, test conditions and test pressure shall comply with the provisions of CJJ94;

b) the use of galvanized steel pipe threaded connections, hot-dip galvanized steel should be used in line with GB/T 3091 regulations, should adopt thicker steel;

c) using the hose connection fitting shape and size should match the size of the hose. Its drawing (pulling off) strength should be consistent with existing national Line relevant standards.

5.1.3 Gas pipe and fittings durability should meet the following requirements.

5.2 Equipment

5.2.1 Gas pressure regulating device, metering devices and valves should technical specifications (sample), the description shall include at least the following.

a) users to install. 1) adaptation Gas category; 2) to adapt to the ambient temperature and installation conditions; 3) maintenance and repair.

b) Technical Data. 1) Type, marking and performance standards; 2) the product structure, materials, size and performance; 3) connection dimensions, import and export of pressure and temperature.

5.2.2 gas regulator means, product quality metering devices and valves should be consistent with existing national standards, its useful life should be in More than 10 years.

5.2.3 import and export pressure and flow gas regulator device should match the conditions of use, performance regulating device overpressure, undervoltage protection device And setting requirements should be consistent with existing national standards. When conditions change, adjust the outlet pressure shall meet the following requirements. After

a) the altitude increases, the outlet pressure regulating device should be a corresponding increase, which increases the value can refer to Appendix A prescribed burning appliances rated And pressure regulator means to a total pressure drop of the gas appliance furthest determined;

b) the gas to a user after using alternative gas (gas Wobbe number variation), the outlet pressure regulating device should be changed accordingly, its value should be changed Appliance according to rated pressure (eg 10T gas Pn = 2.5kPa) and total pressure regulating device to determine the farthest drop burning appliances;

c) After adjusting the outlet pressure regulating device, burning appliances should meet the rated pressure and gas appliance rated heat load requirements. Import and export pressure and flow range

5.2.4 gas metering device should match the conditions of use, and performance requirements set remote table, intelligent table It should be consistent with existing national standards. Flow measurement devices should meet the following requirements.

a) domestic gas flow meter should be based on the total amount of gas equipment all users when using both fixed and determined by calculating the heat load, when Users install a stove and a water heater, and at the same time using a given total heat load should be taken (25 ~ 30) kW (except heating outer);

b) commercial gas flow meter shall be determined based on the number of units and simultaneously burning appliances coefficient.

5.2.5 Gas valve should adopt the quick disconnect valve, valve leakage and over-current cut-off device and set the display performance of the device should be consistent with national Relevant existing standards. Structure type valves shall meet the following requirements.

a) valve nominal size DN, PN and should match the pipe;

b) valve outlet hose connector Appliance plug-in before, its shape and dimensions of hose fittings should match its pull (pull-out) The strength of the product should be consistent with existing national standards.

6.1 Security devices

6.1.1 burning appliances should be set flameout protection device.

6.1.2 Semi-burning appliances should be closed down anti-smoking measures.

6.2.1 Adopting limit gas appliance and gas (

0.5 to 1.5) Test pressure Pn within the scope of inspection should have good combustion properties, not produce incomplete Full combustion, analysis of carbon, tempering and off the fire phenomenon.

6.2.2 limit gas pressure and gas appliance test suitability test used shall comply with GB/T 13611 and GB/T 16411 of.

6.3 Appliance Rated pressure

6.3.1 Household Appliance should be low pressure gas (P < 10kPa).

6.3.2 Commercial Appliance should adopt the low-pressure gas.

6.3.3 Commercial Appliance should use medium pressure gas have appropriate safety devices.

6.4 Materials and Structure

6.4.1 Appliance materials should be consistent with existing national standards.

6.4.2 Appliance overall structure should be consistent with existing national standards. Appliance

6.5 Specification (sample)

6.5.1 gas appliance should be for technical personnel for technical specifications and user's manual.

6.5.2 Technical specification shall include at least the following.

a) the type of gas appliance (by the way to the exhaust points);

b) the gas type and gas pressure rating;

c) gas appliance rated heat load, the rated heat input and heat output, production rate and water tank water capacity (L), the maximum hot water temperature;

d) ventilation and to exhaust;

e) water (water pressure, water quality), power supply (AC voltage, frequency and type I appliances grounding);

f) gas appliance installation.

6.5.3 Instructions shall include at least the following.

a) ignition flame operation and adjustment method;

b) hot water and heating operation adjustment method;

c) warning signs;

d) fire, explosion and poisoning prevention safety precautions;

e) Maintenance and maintenance.

6.6 Appliance with water and electricity

6.6.1 Appliance water pressure, water should match the water supply.

6.6.2 Appliance electricity voltage, frequency, power should match the power supply.

7.1 Open burning appliances

7.1.1 Household Appliance should use the exhaust fan or range hood, etc. meet the following requirements.

a) pressure (static pressure) of not less than 80Pa;

b) should be based on open-air volume (vertical type) gas appliance heat load is determined; when using ventilation fans, air volume is preferably 40m3/kW; when using When the hood, appropriate for the amount of wind (20 ~ 30) m3/kW.

7.1.2 Commercial Appliance should use exhaust fan or range hood, etc. meet the following requirements.

a) shall be determined by wind pressure resistance of smoke;

b) supply and exhaust air flow rate should be determined according to the heat load and exhaust from burning appliances.

7.2 Semi-closed gas appliance

7.2.1 Appliance and exhaust flue should match, and should be a reliable anti-down smoke devices.

7.2.2 flue structure, performance and installation requirements shall comply with the provisions of CJJ12.

7.3 Sealed gas appliance

7.3.1 to the gas appliance and exhaust flue should match, and should be clearly identified to the exhaust port.

7.3.2 to exhaust flue structure, performance and installation requirements shall comply with the provisions of CJJ12. 8 alarms and emergency shut-off valve

8.1 Alarm

8.1.1 Alarm setup and installation shall comply with the provisions of GB 50028 and CJJ/T 146's.

8.1.2 Gas Leak/incomplete combustion alarm product quality should be consistent with the relevant standards and shall meet the following requirements.

a) non-toxic gas (natural gas and liquefied petroleum gas) into the air in a concentration content of less than or equal to 25% of the lower explosive limit of time Alarm shall be given;

b) Toxic gas (artificial gas, etc.) leak into the air, its concentration of carbon monoxide content (volume fraction) of less than or equal to 0.02% when Alarm shall be given;

c) gas appliance incomplete combustion flue gas leaks into the air, the concentration of carbon monoxide content (volume fraction) of less than or equal to 0.02% when Alarm shall be given;

d) alarm and emergency shut-off valve should chain.

8.2 Emergency shut-off valve

8.2.1 emergency shutoff valve and installation shall comply with the provisions of GB 50028 and CJJ/T 146's.

8.2.2 emergency shut-off valve product quality should be consistent with existing national standards.

8.2.3 alarm and emergency shut-off valve should be linked to the use of low-voltage power supply (<=24V), pulses turned off and on-site labor products.