Firt, list the basic data:
1, the characteristics of the medium: name, percentage of medium, the viscosity, corrosive, toxic, etc
2, medium contained liquid particle diameter, content (quality or volume percentage)
3, medium temperature (℃)
4, the need of traffic
Normal light with the pump in the process to neglect ballistic revealed that the amount of bits and pieces, but be sure to contemplate supposed to flow when the process change. Agricultural use open channel water pump then is adopted also must contemplate leakage and volatilization amount.
5, pressure: suction tank pressure tank pressure ballistic fragmentary in pressure drop (elevation poorer)
6, ballistic fragmentary data (diameter, length, number of ballistic accessories varieties and low suck to pressure the pool how many He Biao) then need words should also make installation characteristic curve
In the design arrangement should be careful like ballistic guidelines:
A, while the trade-off ballistic trajectory diameters under the opposite flow, flow progress little barrier to financial ruin but price high ballistic diameter moment cause barrier poorer envoy to sharply increase the selected pump wears power increase profit increase in the number of elevation and operation capability is increased so that should be comprehensive thought skills and economic point of view
B, discharge pipe and pipe joint should be thought would be acceptable to maximum pressure
C, ballistic arrangement should be arranged as soon as possible into a straight pipe in reducing volumes accessories and volume amplification of ballistic trajectory length must beat around the bush of the timing of the elbow without winding radius is 3 ~ 5 times the diameter of the ballistic view as far as possible is greater than 90 ℃
D, the discharge side of the pump must be installed valves (ball valve or valve, etc.) and check valve is used to adjust the point check valve of the pump valve when the fluid flow reversal can prevent inversion and the pump to prevent water hammer blow (large reverse pressure when the liquid flow back to pump corrupt)
Second, determine the flow elevation
A, then in the production process has been given minimum, deformity, maximum flow rate should be according to the maximum flow thought
B, then give only deformity in production process flow should be thought with coupled to the allowance About ns > 100 big flow low its unpreparedness elevation pump flow allowance in 5% of ns > 50 small flow low lift pump flow allowance take 50 or less 10% ns 100 pump flow allowance also take 5% or less of inferior quality and operation conditions stubborn pump flow allowance shall be 10%
C, then the fundamental data only to the component flow should be converted into volume flow
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