Cascade Pump Company
10107 South Norwalk Blvd
P.O. Box 2767
Santa Fe Springs, CA  90670-0767
Phone: 1.562.946.1414
Fax: 1.562.941.3730
Email: pumpinfo@cascadepump.com
 
 
 
 
STANDARD DESIGN SPECIFICATION CASCADE AXIAL FLOW AND MIXED FLOW PUMPS PRODUCT LUBRICATION
 

GENERAL
Cascade Pump Company manufactures a full line of Axial Flow and Mixed Flow pumping equipment.  The Axial Flow line covers a range of flows from 400 to 200,000 gallon per minute at heads up to 30 feet per stage.  The Mixed Flow line covers a range of flows from 500 to 100,000 gallons per minute at heads up to 70 feet per stage.  Pumps can be built with multiple stages to increase head capability.

Normally the pump is installed in a vertical position for pumping from a wet well and discharges horizontally.  Other arrangements are available, including horizontal and slant mount designs.  Consult the factory for any special mounting or discharge configurations.

The product lubricated pump design consists of a bowl assembly, discharge elbow and column, line shafting, lineshaft bearings, packing box assembly, and a headshaft assembly or flanged coupling for the driver.

BOWL ASSEMBLY
The bowl assembly is comprised of suction and discharge bowls cast from ASTM-A-48, class 30 iron, impeller cast from bronze, bowl shaft made from type 416 stainless steel PSQ, sleeve type bearings made from bronze, and split thrust collar and key made from stainless steel. 

The suction bowl consists of flared inlet with straightening guide vanes to resist the formation of vortices and prevent prerotation of the water entering the impeller.  The discharge bowl incorporates diffusion vanes that convert the velocity of the water leaving the impeller into pressure head.

The impeller is attached to the shaft by a straight key and split thrust collars.  This assembly has been designed to allow for the removal of the impeller from the bottom of the pump after removal of the suction bowl and lowering of the shaft.

A separate bowl liner is available as an option.  This liner is replaceable and recommended where severe wear from abrasives may exist.  Because it is replaceable, it may reduce maintenance costs as the bowl in which the liner is mounted may not require replacement.

PUMP ELBOW AND COLUMN
The elbow and column support the driver and direct the flow from the bowl assembly to the discharge piping.  The elbow can be positioned above or below the mounting baseplate. The standard elbow is made of three segments: vertical, 45° insert and horizontal.  Elbows constructed with turning vanes or long radius type can be furnished.  All joints are flanged with register fits machined on centers to assure positive alignment when connected to mating flanges.


Normally the elbow turns the flow 90° from the shaft, but other angles can be furnished when desired.  The discharge nozzle can be furnished in three configurations:  1) plain end suitable for flexible pipe coupling; 2) flanged, or; 3) grooved or a ring added for a victaulic type coupling.

LINESHAFT ASSEMBLY
The standard lineshaft is made from type 416 stainless steel PSQ, threaded between centers.  Couplings are made from carbon steel.  Lineshaft bearings are made from fluted rubber bearings or bronze sleeve type bushings.  Bearing spacing shall be such that the pump operating speed will be 20% above or below the first critical speed of the shaft.  The packing box assembly consists of a housing made from ASTM-A-48, class 30 cast iron, a bearing made from bronze (on smaller pumps the body and bearing may be made in one piece from bronze), a packing gland made from bronze. Rings of packing material are provided to seal to provide a seal for the shaft passing through the box.

DRIVES
Pumps can be driven by either a vertical electric motor or gear box connected to a horizontal electric motor or engine.

There are two types of shaft arrangements available on drives to connect to the pump lineshaft.  Vertical hollow shaft drives incorporate a headshaft and adjusting nut. In this arrangement the headshaft is connected to the driver with a key and coupled to the pump lineshaft with a threaded sleeve type coupling.  The adjusting nut is used to adjust the impeller running clearance.  After impeller adjustment is made the nut is locked to the clutch.  The other drive arrangement is solid shaft.  On Axial Flow pumps a two-piece coupling is incorporated to adjust the propeller in its proper running position in the bowl assembly. Mixed Flow pumps have a three-piece coupling incorporated for adjusting the running clearance of the impeller. Both types of couplings are furnished with straight keys and annular thrust collars to transmit the torque from the driver to the pump shaft and the thrust developed by the pump to the thrust bearing in the driver. A spacer type coupling can be provided for ease of maintenance on packing or a mechanical seal. On horizontal pump applications or where a motor is used that does not incorporate a thrust bearing, the pump can be designed and built to incorporate the bearing necessary to withstand the thrust developed by the pump.

 
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