PA & PAH Series Gorman Rupp Dewatering Pumps

//PA & PAH Series Gorman Rupp Dewatering Pumps
PA & PAH Series Gorman Rupp Dewatering Pumps 2018-02-09T15:42:17+00:00
dewatering pumps

PA & PAH Series

The Gorman-Rupp PAH Series of prime assist (also known as dry prime or auto prime) centrifugal pumps are capable of delivering high heads and/or high flows for applications from wastewater bypassing to mine dewatering. Field adjustable running clearances mean this dewatering pump can be kept at peak efficiency and left in the field for longer (instead of having a trip back to the workshop for a wear ring change). Advantages include:

PA & PAH Series Dewatering Pump – Special Features

Patented External Shim-less Adjustment System
The shim-less impeller clearance adjustment allows for accurate maintenance of the clearance between the impeller and wear wear ring, without replacing parts or removing the dewatering pump from service. Once adjustments have been made, the unique collar and adjusting screw maintains the clearance setting during other maintenance or inspection events. Peak efficiency is maintained, the life of the wear ring is maximised, and the potential for blockages is reduced.
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Bearing/ Shaft Protection
The bearings and shaft of a Gorman-Rupp PAH Series dewatering pump are protected in the event of a mechanical seal failure. A double lip seal and atmospheric vent arrangement are in place if the mechanical seal is breached. Any leak through the mechanical seal and past the first lip seal will vent to atmosphere and not breach the bearing chamber.

PA & PAH Series Dewatering Pump – Overview

Gorman-Rupp Prime Air Priming Assisted Pumps

Gorman-Rupp Pumps for Construction

Gorman-Rupp Contractor Pump Guarantee

High and Dry

Gorman-Rupp self priming centrifugal pumps can be mounted “high and dry” above the sump liquid level. No need for (submersible) pumps to be in the liquid being pumped (wearing and corroding from the inside and the outside). This means there are no guide rails to maintain, no [leaking?] discharge bend to maintain/replace, and no need to open wet well lids and expose operators to falls.

Self priming pumps also virtually eliminate confined spaces issues and eliminate the need for lifting devices such as cranes or hoists, because pumps are at the surface [ground level], so are easy to access for monitoring and maintenance.

Reduced WH&S

Using Gorman-Rupp self priming pumps can reduce WHS issues associated with pumping applications. Because pumps are located at “ground level”, high and dry above the wet well [not in it], pumps are easily accessed by operators for monitoring, maintenance or repair. Some of the identified risks that can be reduced or eliminated include:

        • Working over water
        • Working at heights
        • Working with cranes
        • Working with heavy swinging weights

Other OH&S issues can also be eliminated with the use of self primers. Unlike submersible pumps, self priming pumps do not need guide rails and discharge base elbows that will need service and replacement over the life of the installation, requiring confined spaces entry and the associated dangers. Submersible pumps also need chains to raise them to the surface. These chains can become corroded and weakened over time, creating a potential danger to operators lifting them.

Easy Access

Because Gorman-Rupp self priming pumps are located at ground level, high and dry above the liquid level, they are easy to access for monitoring, service and repair.

Whereas submersible pumps can only be accessed by opening wet well lids (exposing operators to “working at heights” and “working over water”) and winching or craning pumps to the surface (exposing operators to “working with swinging weights”), operators can access Gorman-Rupp self primers at ground level.

End suction pumps will often need a “dry well” which is accessed by going down stairs or a ladder. They need isolation valves on the suction. This makes them more difficult to access than Gorman-Rupp self primers.

Maintenance Features

Gorman-Rupp PAH Series of “auto prime” pumps have been designed to be the easiest and most cost effective “dry prime” pumps to service and maintain. The following features make life easier for operators and very cost effective for asset owners:

Less Blockages

Because all internal passages will handle a 76mm spherical solid [on trash pump models], PAH Series pumps will choke less than most other wastewater pumps. This minimises downtime, increasing productivity.

Easy Blockage Removal

All pumps will eventually choke on something. But unlike common dry prime pumps, Gorman-Rupp PAH Series pumps have a removable cover-plate, allowing access to pump internals and/or the air separation chamber screen in minutes, by just one operator, making blockage removal a quick and easy task.

Easy and Simple Clearance Adjustment

Most centrifugal pumps [including most dry prime pumps] need to have their wear rings replaced when clearances have worn to an unacceptable level. This will require pumps to be pulled down and maybe casings heated and/or wear rings cooled, and maybe the old wear plate chiselled out, then a new one fitted. Gorman-Rupp PAH Series pumps have clearances that are adjusted through external adjusting screws on the back cover-plate. One operator with 2 spanners can adjust clearances in just 4 minutes. Adjusting clearances on other types of dry prime [or auto prime] pumps could take several operators most of an entire day. This means a Gorman-Rupp PAH Series will spend more time “at the coal face” and less time in the workshop.

Materials of Construction

Gorman-Rupp pumps can be purchased in a variety of materials of construction, to suit the liquid being pumped.

The following table shows the available materials of construction of the Wastewater and effluent pump series.

Pump Series Standard Cast Iron HDI Fitted 316SS Fitted CD4MCu Fitted Complete CD4MCu Complete HDI High Chrome Impeller
Ultra V
*
*
*
*
Super T
*
*
*
*
*
#
#
Super U
*
*
*
*
*
10 Series
*
*
*
*
80 Series
*
#
PA/PAH
*
*

‘* Denoted all models

‘# Denotes some models

“Fitted” refers to pumps that are supplied with the standard construction pump, but fitted with special material impeller, wear plate, seal plate and shaft.

“HDI” is Gorman-Rupp’s “Hard Iron”. This material is used to resist the action of abrasive materials such as grit. This material has a Brinell hardness of approximately 400, making it approximately twice as hard as cast iron.

316SS is a marine grade stainless steel, used for service where liquids are corrosive. It has a PREN [Pitting Resistance Equivalent Number] of 27.1 and a Brinell hardness of approximately 217.

CD4MCu is a Duplex Stainless Steel, used where services are corrosive and abrasive. It has a PREN of 32.1 and a hardness of 280-300 on the Brinell scale.

High Chrome impellers, available in Super T Series models T3, T4 and T6 have a brinell hardness of approximately 650 and is an excellent material choice for highly abrasive service.

The following table shows the available materials of construction of the clean water and fuel handling pumps pump series.

Pump Series Cast Iron Construction Cast Steel Construction Cast Aluminium Construction Bronze Fitted Aluminium Impeller Ductile Iron Casing
0 Series
#
#
#
#
Roto Prime
#
#
#
VG/VGH
#
#

 

Gorman-Rupp G Series [rotary gear pumps] are available in the following materials of construction:

  • All Iron (including Ductile iron rotors – 2.5 times the strength of cast iron)
  • All Steel
  • All stainless steel
  • Extreme Duty fitted (hardened components to resist wear)