Trap selection must provide trap scanty water also called displacement ( Steam consumption) , working pressure difference of the steam trap, the working condition parameters such as temperature, details are as follows: 1. Trap of thin water: when choosing trap, must according to the equipment of the steam consumption per hour times choose ratio 2 - Three times as the biggest condensation water, to select the displacement of the steam trap. Can ensure trap while driving to discharge the condensate as soon as possible so that we can rapidly increase the temperature of the heating equipment. Trap discharge energy is insufficient, will cause the condensate can not discharge in time, reduce the thermal efficiency of heating equipment. ( When the steam heating equipment started to steam as equipment is cold, internal air, need the air to trap the flowing rapidly, to a large number of low temperature condensate, the device gradually heat up, then the equipment into the normal working condition. Because while driving, a large number of air and low-temperature condensate, low inlet pressure, make the trap overload operation, the trap requirements than normal displacement at work, so according to the selection ratio 2 - Three times to select trap. ) 2. Working pressure difference of the steam trap: when choosing trap, can't choose to nominal pressure steam trap, because the nominal pressure can only be said drain Industrial Valves body shell under pressure rating, trap nominal pressure and pressure difference is very big. So according to the working pressure difference to selection trap displacement. Working pressure difference refers to the working pressure minus before the trap trap export back pressure difference. Back pressure calculation is trap: ( When water discharged into the atmosphere after the trap, trap export back pressure is zero. If the discharge of condensed water trap, centralized recovery at this point, the export back pressure of the steam trap is the resistance of the return pipe, return pipe lift height, the second evaporator ( Back to the water tank) Internal pressure combined. ) 3. Mechanical type of trap seat number: mechanical type of trap according to different working pressure difference, divided into a variety of specifications of Industrial Valves seat aperture 'seat number', each work pressure difference with 'seat number' of a coordinate curve of displacement, scanty water in different 'seat number' have very big difference. Mechanical type steam trap shall be according to the process conditions of the maximum working pressure difference and maximum displacement curve of the coordinates of the corresponding to choose the appropriate 'seat number'. Cannot be set in nominal pressure 'seat number', if choose the wrong 'seat number', likely trap water does not work or equipment, influence the normal operation of equipment. 4. Working temperature of the steam trap: selection of steam trap, to choose according to the highest temperature steam pipe can satisfy the requirement of process conditions of steam trap. The highest temperature pipe steam more than nominal pressure corresponding saturated steam is called the superheated steam temperature, select trap in superheated steam pipe, should be chosen for high temperature and high pressure superheated steam trap. 5. Connection size: trap trap process conditions decided, then, according to the working pressure difference before and after steam trap, drain water and 'seat number', according to the manufacturer's technical parameters of trap to selection trap size. ( Not according to the size of devices connected to matching the same size of the drain Industrial Valves, steam trap connections diameter does not represent a scanty water, the size of the same caliber of trap, hydrophobic ability may vary widely; So when choosing trap must according to the process condition of equipment and reference to trap manufacturers provide parameters for selecting the trap is the right choice.
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