Wenger 72944 Especificações descarregar pdf (Página 255)

Section 6 The Selected Alternative Plan

EAA Storage Reservoirs Revised Draft PIR and EIS February 2006

6-27

6.4.3.2.6 Pumping Station Modification Recommendations

Pump station, pump, and engine design modifications for G-370 and G-372

include the following systems:

a) Pump Station

• Backflow gates for each large pump

• Dewatering bulkheads or stoplogs

b) Pump changes

• New impellers

• Pump speed increase

c) Diesel engine

• Speed increase

• Turbo-charging

• Auxiliaries (heat exchangers, silencers, etc.)

• Controls

d) Reduction Gear and power transmission shaft

Pumps at G-370 and G-372 were designed using a discharge chamber as the sole

means of backflow prevention, and order to protect against water flowing back

from the EAA reservoir through the pumps, both backflow gates and emergency

bulkheads must be added to the pump discharge arrangement.

Modification design details are provided below.

6.4.3.2.7 Pumping Station Modification Details

Pump and engine manufacturers have been consulted, and the following

modifications are recommended for efficient operation at the increased head

requirements and have enough flow to maintain 700 cfs for G-370 and 750 cfs at

G-372. Although it may be possible to change the operating system pump curve

by using the pump similarity laws and merely increase the pump speed 10%

from 113 to 124 RPM, this would result is operating with greater reductions in

both flow and efficiency 20% or more less than the normally preferred 80%.

Present Engine Rating

G-370 - 1360 hp, present rating for 8 cylinder engine, 170 hp per cylinder

G-372 - 1530 hp, present rating for 9 cylinder engine, 170 hp per cylinder

Preliminary Horsepower Rating Required for 12-foot EAA reservoir

G-370 - 2060 hp rating, when increasing pump speed 10% with the new impeller,

G-372 – 2070 hp rating, keeping the same pump speed and a new impeller.

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Wenger 72944 Especificações Página 255