Description: smallest head that the pump can provide in operation without damage; Name: minimum permitted head
Description: Minimum permissible head at which the pump can be operated without suffering damage; Name: Minimum allowable head
Description: average speed given by the stroke length multiplied with the number of complete pumping cycles of the piston, plunger or piston attached to the diaphragm per minute (stroke per minute or pump crank speed); Name: piston velocity