If a choice of different-diameter pipe size specification and process diameter of pipe, should undertake corresponding non-reducing or diameter of pipe, if so, should consider the shrinkage of the pressure loss caused by affect process. Different-diameter pipe actual use and production process according to certain standards and technology, ensure production to meet the different-diameter pipe, the use of market demand in the industry plays an important property values. In order to prevent after installation of different-diameter pipe velocity distribution, the influence caused by pressure loss, thereby reducing the electromagnetic flowmeter measurement precision, the requirements of the center of alpha not greater than cone Angle, 55x55mm are 15 °. Are divided into two kinds, one and eccentric concentric different-diameter pipe commonly used in vertical pipe, Eccentric different-diameter pipe horizontal pipe, and used to indicate the top flat or attention.
When pipelines from downward into pumps, level of different-diameter pipe should be taken to prevent the flat ", "gas in the pump suction diameter changes in accumulation, eccentric different-diameter pipe has adopted the" top flat "installation way, even from the pipe down into the pump. Level With the medium of impurities in the pump suction side, when inhaled speed below its impurities settling velocity, bianjing tube should take "the tank bottom flat" insert the same orifice diameter. In the same tank vacuum tubes inserted different combinations, assembled from different thermal properties of water heater daytime, namely different-diameter pipe set out as a sample, can represent the poor performance of the seven, and price difference, the solar energy water heater for numerous pioneered realizes standardization.
Different-diameter pipe in the specific use and operation process need notices and method is very much, basically have the following places: when the pipe fluid flow changes, such as increasing or decreasing, velocity changed requirements, should be adopted different-diameter pipe. The import, in order to prevent the pump cavitation. Pump inlet pipe diameter changes when level, should choose eccentric different-diameter pipe. When the pipe from the upward horizontal into pump, different-diameter pipe should take the "top flat." With instruments, such as flowmeter, the regulator shall, in order to cooperate with meter connector, also adopted different-diameter pipe. Pump inlet different-diameter pipe installation should not make the gas accumulation, bianjing place to avoid improper installation and cavitation.