Liquid Ring Vacuum Pump, Paper Mill Rebuild
PSRG has for over thirty years been repairing liquid ring vacuum pumps for various industries
Pump:- Siemens |
Industry:- |
Pumped Media:- |
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The unit prior to disassembly was imaged and booked on to our database which allocates a unique internal repair and tracker number. The pump was then dismantled, pressure cleaned, shot blasted, inspected and the following was found. |
Unit as received |
Rotor: The rotor in general terms is in reasonable condition but the impeller has lost part of its coating and will need re-coating. The end shrouds are marked slightly due to product abrasion in the clearance to the headers. One side is thinner than the other and although fit for further service will need remedial work shortly. These shrouds need machining in order to maintain close tolerance to the end shields.
The shaft packing sleeves are well down on diameter in sections, they will need corrective work at this repair. All bearing landings remain in serviceable condition requiring a light polish at the stage where the rotor assembly is in a lathe.
Headers: Both were clearly blocked at the portings.
We found during disassembly that one header was damaged at the flap valve porting, the liner had started to lift prior to breaking away, this can be corrected by building up the damaged section.
Both header are lightly marked due to product abrasion with the impeller shroud.
One had its flap valve plate missing and this will need to be manufactured and fitted during assembly. Both PTFE flap valves will be replaced.
Body: The body remains in good condition requiring a light fettling at the gasket surface to clean up the recess.
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Impeller |
Scored Gland Area |
Shroud and Vane |
A full quotation report was then produced and sent to the customer.
Both Headers will be grit blasted to SA 2 1/2 @75 microns to remove and achieve correct surface profile and cleanliness requirements in the areas where any wear/damage has occurred prior to repair with Belzona 1111 super metal.
Both gland areas will be cleaned out to facilitate the lantern restrictors and new packing rings.
The rotor was grit blasted to SA 2 1/2 @75 microns to remove suspect coating, and achieve correct surface profile and cleanliness requirements. The internal surface contours were then coated in a two coat system of 1341 super glide due to the customers requirement to improve efficiency, improve power consumption and replace existing worn coating.
The unique hydrophobic nature of the Belzona 1341 system makes water simply roll off. Wear by abrasion is minimized by its encapsulated blend of lubricating and abrasion resistant fillers. When applied to fluid flow equipment, Belzona 1341 can reduce power consumption, increase efficiency, lower operating costs and improve hydro dynamic performance.
The rotor was then machined on both running faces. The body was machined so correct operating clearances were attained.
Both shaft sleeves were repaired with Belzona 1131 which has a unique micro-porous structure to trap and hold lubricating oil and minimize friction and wear on start up.
The rotating element was dynamically balance checked and adjusted if outside tolerance.
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Header being Machined |
Coated Rotor |
Coated Gland Sleeve |
The unit was then rebuilt with the following spares:
3 Bearings - 1 x Thrust + 2 x Roller. 2 Gland packing sets. 1 Gasket set. 2 PTFE flap valves. 1 Flap Valve Plate. 2 V seals.
On completion of rebuild the unit was installed on to our dedicated test facility and performance tested to OEM curve.
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Unit being performance tested in our workshop |
A test certificated was then produced and the pump spray painted and packed for dispatch
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