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Among them, the three mandatory product standards for gas appliance connection hoses that everyone has been concerned about have all been promulgated, and they will be implemented on August 1, 2024.
The controversial standard for rubber composite hoses, GB 44023-2024 "Rubber Composite Hoses for Gas Appliance Connections", has gone through two public consultation drafts, and the last one was closed on April 23, and an announcement was issued on April 29, which is a bit of a time press.
燃气用具连接内用橡胶复合软管 Compounded rubber hose for internal use in gas appliance connection
An inner hose made of rubber blend or rubber-plastic blend of metal-coated hose for gas appliance connections.
Note: Abbreviated as "inner hose".
As can be seen from the model, natural gas and liquefied petroleum gas are universal, and artificial gas needs to be noted that it is a different model, and dimethyl ether is not applicable.
The service life is not less than 8 years, and there are pull-out force of 100N, pressure resistance of 200kPa, air tightness requirements under 100kPa, etc. (maximum working pressure of 10kPa).
The above content is taken from the second version of the draft for comments, which has changed significantly compared to the first version. If you are interested, you can check out:
Rubber hoses that are not less than the number of years of waste of gas appliances - "Rubber Composite Hoses for Gas Appliance Connection" GB draft for comments
The other 2 are now used more: GB 41317-2024 "Stainless steel corrugated hose for gas appliance connection" and GB 44017-2024 "Metal-coated hose for gas appliance connection". In the retrofit and upgrade of hoses for existing users, the selection of metal-coated hoses should be simple, convenient for procurement and construction, etc., and there is no evidence that the high-priced appliances are better and safer than metal-coated hoses for connecting stainless steel corrugated hoses.
At the same time, there are also 2 standards related to the gas industry:
1. GB 44016-2024 "Solenoid Gas Emergency Shut-off Valve": Regarding this standard, there is an article on this official account that briefly discusses: the normally closed and power-off closure of gas solenoid valves, and there are 2 terms in the draft released on December 13, 2023:
3.4 保持式常闭切断阀 Hold type closed shut-off valve
This is a shut-off valve that automatically closes when the power is off and can be opened manually when the power is not on.
3.5 保持式常开切断阀Hold type open shut-off valve
This is a shut-off valve that automatically closes when powered on and can only be opened manually when powered off.
The emergence of new product types, I think, will affect the corresponding question requirements and descriptions of the national standards that GB50028 split out of the user part.
2. GB 35848-2024 "Commercial Gas Burning Appliances" replaces GB 35848-2018.
5.2.1.8 Gas appliances should not be designed with space for gas cylinders.
5.2.1.9 The gas appliance shall have measures to prevent the user from adjusting the rated heat load.
5.2.1.11 Combustion appliances should be designed in such a way as to prevent spills from being injected into the appliances that may cause flameout, worsening combustion or other hazards.
5.2.1.13 Flame-out protection devices shall be installed on gas appliances.
5.2.1.14 A gas regulator shall be installed on the full premixed combustion mode combustion unit.
5.5.13.1 The thermal efficiency of the condensing steam generator shall not be less than 94%
The thermal efficiency of non-condensing steam generator is not less than 80%
5.5.13.2 The thermal efficiency of the condensing steam generator is not less than 94%
The thermal efficiency of the non-condensing steam generator is not less than 80%
The thermal efficiency of the water tank steamer is not less than 70%
5.5.13.3 The thermal efficiency of fryers and cooking stoves shall not be less than 50%
5.5.13.4 The thermal efficiency of the large pot stove shall not be less than 45%
5.5.13.5 The thermal efficiency of the clay stove shall not be less than 45%;
5.5.13.6 The thermal efficiency of the water boiler shall not be less than 80%
5.5.13.7 The thermal efficiency of the gas rice cooker shall not be less than 50%
5.5.13.8 The thermal efficiency of the stir-fry stove shall not be less than 25%
Source: E-Grid Gas