Liquid Ring Vacuum Pump, Sugar Rebuild

PSRG has for over thirty years been repairing liquid ring vacuum pumps for various industries

Pump:- Hick Hargreaves
SHR 22500
Industry:-
Sugar
Pumped Media:-
Water / Sugar
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
  • The gland area was in poor condition with shaft wear found
  • Both impellers and bodies had glass flake coating applied which was heavily worn
  • Heavy wear due to cavitation and erosion was apparent to the leading and trailing edges of the suction impeller. Similar wear was also found to the and delivery impeller and bodies
  • All plates were scored due to contact from the impellers and were worn due to erosion
  • The non-drive shaft bearing location was worn

Scoring to Intermediate
Plates

Cavitation to Impellers
The following work was then carried out
  • The impellers were be hydraulically pressed from the shaft
  • Both impellers were grit blasted to SA 2 1/2 to remove existing coating, surface impurities and so incorrect surface profile is achieved
  • The areas on the suction impeller which had been subjected to cavitation were rebuilt with Belzona 1311 Ceramic R metal and formed back to profile
  • Both impellers were coated with Belzona 2141 anti cavitation coating to protect against further wear. This replaced the previous glass flake coating which had not protected the base metal

Suction Impeller after Grit Blast

Impeller after Application of 1311

Impeller after being Ground to Profile

  • The gland packing sleeves were grit blasted to SA 2 1/2 @ 75 Microns and the rebuilt with Belzona 1131 bearing metal and then machined to size
  • The NDE worn Bearing location were grit blasted to SA 2 1/2 @ 75 microns and then rebuilt with Belzona 1311 ceramic and then machined to size
  • The shaft diameters were polished and threads cleaned
  • All four plates were undercut and prepared for Belzona application by machining
  • The plates were rebuilt with Belzona 1311 Ceramic R
  • All plates were machined to original size
  • Both Suction and delivery bodies were then grit blasted to SA 2 1/2 @75 microns
  • The suction body was rebuilt with Belzona 1311 Ceramic R metal where wear due to product wash was apparent
  • Both bodies were coated with Belzona 1321 Ceramic S to protect against future wear
  • Both bodies were machined so correct clearance is established against the impellers

First Coat of 2141

Impeller being Coated

Second Coat of 2141 being Applied

On completion of all Machining and coating the unit was rebuilt in accordance with OEM clearances with the following spares

1 Drive end bearing. 2 Non Drive end bearing. 2 Bearing locking sleeves. 3 Locknuts. 3 Tab washers. 1 Drive end gland packing set. 1 Non drive gland end packing set. 1 Gasket set fastenings as required. Consumables: Oil, lubricant, grease etc.

The unit was performance tested in our dedicated test facility against the OEM curve