Atmospheric hot water boiler is a type of hot water boiler, mainly used in winter heating, hot water supply and other fields. Due to the high safety performance of the boiler, it is trusted and used by the majority of users. Although the safety performance of atmospheric hot water boilers is very high, there are strict standard requirements in terms of design, manufacturing, inspection, acceptance and delivery technical documents, which should meet JB/T7985-2002 "Small Boilers and Atmospheric Heating Technical Conditions for Water Boilers", according to the requirements of JB/T7985-2002 "Technical Conditions for Small Boilers and Atmospheric Hot Water Boilers" [New Standard].
Recently, Zhengzhou Fangkuai Boiler Factory found that many users who use atmospheric hot water boilers do not care much about the installation and use of boiler air pipes. In fact, this is a very dangerous behavior, and improper operation can easily cause boiler damage.
According to the provisions of Article 6.2.9 in the “Conditions” mentioned above, the equivalent diameter Dd of the atmospheric pipe connecting pipe of the atmospheric hot water boiler should be calculated as follows: Dd=88×√(Q), where Dd——atmosphere The equivalent diameter of the connecting pipe, in millimeters (mm); Q——The rated thermal power of the atmospheric hot water boiler, in megawatts (MW). The calculated Dd value is rounded according to the diameter of the pipe specification and can only be increased, not reduced.
According to the provisions of Article 6.3.5 of JB/7985-95 [Old Standard], the pipe diameter should be calculated according to the following formula: Dd=20+88×√(Q), where Dd——the equivalent diameter of the atmospheric connecting pipe, unit It is millimeter (mm); Q——The rated thermal power of atmospheric hot water boiler, the unit is megawatt (MW). The calculated Dd value is rounded according to the diameter of the pipe specification and can only be increased, not reduced.