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Refit description

Vacuum pump NASH 904r

  • Date: 08.08.2019 – 15.10.2019
  • Device type: Vacuum pump
  • Localization: Stora Enso Poland S.A.
  • Manufacturer: NASH
The photo shows the sidewalls of the vacuum pump after shot blasting, repainted from the outside with primer and lining the first layer of Belzona 1331 composite inside the sidewalls.
Refit of NASH 904R pump Side walls of the vacuum pump after shot blasting and applying first layer of coating inside the walls.

 Primer painted sidewall of vacuum pum
Primer painted sidewall of vacuum pump, check valve coated with Belzona 1331

The photo shows the outer surface of the vacuum pump sidewall after the primer has been applied. In addition, the side wall check valve is coated with Belzona 1331.


After verification of the pump, it turned out that on the surface of a sidewall it is necessary to perform a hardacing of the crack. The surfacing was then sanded, restoring the sidewall to its proper condition.

Hardfacing made on the surface of one side of the wall of the vacuum pumpj
Hardfacing made on the surface of one side of the wall of the vacuum pump

 The inner cone
The inner cone attached to the sidewall after the first layer of Belzona 1331 has been applied and the bottom outlet of the vacuum pump during the application of Belzona 1331.

Photo shows the inner cone attached to the sidewall after the first layer of Belzona 1331 has been applied and the bottom outlet of the vacuum pump during the application of Belzona 1331.


Impeller in the process of applying Belzona 1331 composite. The photo also shows new stainless steel bushings fitted to the impeller shaft.

   Impeller in the process of applying Belzona 1331 composite.
Impeller in the process of applying Belzona 1331 composite.

The vacuum pump is fully assembled
The vacuum pump is fully assembled

Photo of the assembly of the vacuum pump. The body and walls are covered with a layer of protective varnish. The cones and the impeller shaft have been previously legalized. The side walls of the pump and the impeller are covered with Belzona 1331.