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 FOR OIL LUBRICATION CASCADE AXIAL FLOW AND MIXED FLOW PUMPS
 

GENERAL
Cascade Pump Company manufactures a full line of Axial Flow and Mixed Flow pumping equipment.  The Axial Flow line is composed of several sizes that cover a range of flows from 400 to 200,000 gallon per minute at heads up to 30 feet per stage.  The Mixed Flow line is composed of several sizes that cover 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 pumps are installed in a vertical position for pumping from a wet well and discharging horizontally.  Other arrangements are available, including horizontal and slant mount designs.  Consult the factory for special mounting or discharge configurations.

The standard pump is an oil lubricated design consisting of a bowl assembly, discharge elbow and column, line shafting, shaft enclosing tubes, lineshaft bearings, tension nut assembly, oil reservoir with solenoid valve and fittings, and headshaft assembly for vertical hollow shaft driver. A flanged coupling for the driver can be provided for vertical solid shaft drives.

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

The suction bowl consists of a 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 configurations can be furnished.  All column joints are flanged with register fits 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 ASTM-A-108, grade C-1045, PSQ carbon steel, threaded between centers.  Couplings are made from ASTM-A-108, grade C-1020 carbon steel.  Lineshaft bearings are made from bronze with external threading to act as a connector for enclosing tubes.  Normal spacing for lineshaft bearings is 60 inches. This may vary depending upon length,  diameter and rotating speed of shaft.  The shaft enclosing tube is made from extra heavy ASTM-A-120, grade B schedule 80 pipe with threads connecting the lineshaft bearings.  The tension nut assembly consists of a tension nut made from ASTM-A-48, class 30 cast iron, a bushing made from bronze (on smaller pumps the body and bushing may be made in one piece from bronze), and lock ring made from bronze.  A ring of packing material is provided between the lock ring and tension nut to provide a seal for the enclosing tube.

LUBRICATION
Standard pumps are designed for oil lubrication and are equipped with an oil reservoir, solenoid valve and needle valve.  This assembly is connected to the tension nut body by tubing which allows the oil to gravity flow into the tension nut body bushing and down the lineshaft to lubricate each lineshaft bearing and the upper discharge bowl bearing.  The lower discharge bowl bushing is lubricated by a mixture of oil and the water being pumped.  The discharge bowl incorporates a bypass port to act as a drain for excess oil and pressure relief for the enclosing tube.  The suction bowl is provided with a pocket below the bushing and is packed with non water soluble grease and provides lubricant for that bushing.  As an option, a grease line running from the baseplate to the suction bowl pocket can be furnished for ease of maintaining bushing lubrication. 

There are other means of lubricating pump bearings.  Lubrication methods available include product, positive water flush and grease (manual or automatic).  Pump construction will differ depending on lubrication selected.  The condition of the water to be pumped will dictate the optimum lubrication system.  When pumping clear water, oil or product lubrication is sufficient.  Under severe conditions with abrasives, a positive water flush or grease lubricant is more appropriate.  Consult the factory if help is needed to decide an appropriate lubrication system for a given application. 

We also offer many different materials of bushings and bearings.  Our standard material is SAE 660 Bronze.  Other materials for bushings and bearings include Non-Metallic Back Marine Bearings, Bronze Backed Marine Bearings, Teflon, Ryertex, Cast Iron, SAE 63/64, Graphalloy, and other customer specified materials.

DRIVES
Pumps can be driven by either an electric motor or gear box connected to an 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 bolted coupling is incorporated to adjust the propeller in its proper running position in the bowl assembly.  Mixed flow pumps a three piece bolted coupling is 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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