Centrifugal slurry pumps use the optional eight major misconceptions

Centrifugal slurry pumps use the optional eight major misconceptions

First, the high lift slurry pump for low lift slurry pumping

      Many believe that the lower the slurry pumping machine hand lift , motor load is smaller. In this misconception misleading , buy slurry pumps, slurry pump head will often choose very high. In fact, for centrifugal slurry pump , when the slurry pump model to determine its size and power consumption is proportional to the actual flow of the slurry pump . The slurry pump flow will decrease with an increase in lift , so the higher the head, flow is smaller, the smaller the power consumption . Conversely , the lower the head, the greater the flow , the greater the power consumption . Therefore, in order to prevent motor overload, generally require the use of slurry pumps actual slurry pumping head of not less than 60% of the calibration lift . So when high lift for low lift slurry pumping , the motor is easy to overload fever, severe cases can burn motor. If emergency use , you must attach an outlet for regulating the water valve ( or a small block of wood and other objects outlet ) to reduce traffic and prevent motor overload . Note that the motor temperature , motor overheating if found , should be promptly turned down or shut down the outlet flow . It is also easy to misunderstand some machine hand consider plugging the outlet , forced to reduce traffic , will increase the electrical load . In fact, just the opposite, on a regular power outlet units are equipped with centrifugal irrigation valve, in order to reduce the load on the motor unit startup, valve should be closed until the motor starts and then gradually open the valve is the truth.

Second, the large-diameter pipe with a small slurry pump slurry pumping

      Many believe that this can increase machine hand the actual head , in fact, the actual slurry pump head = total head – loss of lift . When the slurry pump model to determine the total lift is certain ; loss of lift mainly from the pipe resistance , the smaller the diameter Obviously the greater the resistance , and thus the greater the loss of lift , so the reduced diameter, the actual lift slurry pump not only can not increase , but will be reduced, resulting in decreased efficiency of the slurry pump . Similarly, when a small slurry pump with a large diameter pipes slurry pumping , it will not reduce the actual lift slurry pump , but will reduce the resistance of the pipeline due to a loss of lift is reduced , so that the actual head increased. Also considers small organic hand slurry pump with a large diameter pipes slurry pumping bound to greatly increase the electrical load , they think the diameter increases, the pressure of the water in the outlet pipe of the slurry pump impeller is large, and thus greatly increase the electrical load . As everyone knows , the size of the liquid pressure and head level only , but not to the size of the pipe cross-sectional area . As long as a lift slurry pump impeller dimensions remain unchanged , regardless of how the diameter , the pressure acting on the impeller are fixed. After just a pipe diameter increases, the flow resistance will be reduced, leaving the flow rate increases, power consumption is also appropriate to increase . But as long as the nominal head range , regardless of how the increased diameter of the slurry pump is working properly , and also can reduce piping losses and improve slurry pump efficiency .

Third, when you install the water pipes, the level of the horizontal section or upturned

      Doing so will cause accumulation of air in the intake pipes, water pipes and reduce the degree of vacuum slurry pump , the slurry pump suction head lowered , the water is reduced. The correct approach is : the direction of the horizontal section of the water should be slightly tilted , not level, but can not tilt upward.

Fourth, with the elbow into the water on the road and more

      If the inlet elbow with multi- way will increase the local flow resistance . Bends in the vertical direction and should turn, turn in the horizontal direction is not allowed , to avoid accumulation of air .

Fifth, the slurry pump inlet is directly connected with the elbow

      This causes uneven distribution of water flow through the elbow into the impeller . When the inlet pipe diameter is larger than the slurry pump inlet , eccentric reducer should be installed . Eccentric reducer flat part to be installed on the top ramp portion mounted below. Otherwise gather air , reducing the amount of water or no water slurry pumping , and a crash and so on. If the inlet pipe and the slurry pump inlet diameter equal, should be between the slurry pump inlet pipe and elbows have been added , the length of straight pipe shall not be less than 2 to 3 times the pipe diameter.

Six , equipped with the most bottom inlet valve is not perpendicular to the next section

      If this installation , the valve can not close on their own , resulting in leaks. Correct installation method is: the end of the inlet valve fitted , most preferably perpendicular to the next section . As a result of topographical conditions can not be mounted vertically, the pipe axis and the horizontal angle should be 60 ° or more.

Seven intake inlet wrong location

      ( 1 ) into the inlet pipe from the water bottom and wall distance is less than the inlet diameter. If the bottom with sand and dirt , while the distance from the bottom of the intake is less than 1.5 times the diameter will cause poor or inhaling water when slurry pumping sediment debris , clogging intake .

      (2 ) into the inlet pipe into the water deep enough, it will cause the water inlet swirl around , the impact of the water , reducing the amount of water . Proper installation methods are: small and medium sized slurry pump into the water depth of not less than 300 ~ 600mm, large slurry pumps shall not be less than 600 ~ 1000mm.

Eight outlet port above the normal water level in the pool

      If the outlet above the normal water level in the pool , although the increase of the slurry pump head, but reducing the flow . As a result of topographical conditions, the outlet must be higher than the water level in the pool should be installed in the nozzle bends and short tube , so that became siphon pipes , reducing the height of the outlet .