The manufacturer of the screw pumps listed in Table 13-1 has rated the pumps at an angle...

The manufacturer of the screw pumps listed in Table 13-1 has rated the pumps at an angle of 38^o to shorten the footprint and increase the lift. The rating downsizes the flow rate by a factor of 0.71 and increases the head available by a factor of 1.4. Rework Problem 13-2 with the new ratings for the screw pumps. Complete the design by providing the following: pump specifications (diameter, number of flights), number of pumps, sketch of the plan view with dimensions (assume the width of each pump equals the diameter of the screw plus 0.6 m).

Problem 13-2

Using the pumps given in Table 13-1, design a screw pump system for the village of Fishkill using the following assumptions:

Interceptor sewer

Minimum sewage elevation = 112.60 m

Maximum sewage elevation = 112.80 m

Discharge elevation to stilling well = 116.40 m

Average flow at design life = 8,600 m³/d

Peaking factor for peak hour = 2.8

Ratio factor for minimum flow at beginning of design life = 0.49

Complete the design by providing the following: pump specifications (diameter, number of flights), number of pumps, and a sketch of the plan view with dimensions (assume the width of each pump equals the diameter of the screw plus 0.6 m).

Table 13-1