DCL Engineering Group provides engineering solutions including refurbishing and coating worn parts from pulp and paper manufacturing equipment to increase service life. They can re-shape and hardface coat rotor pulpers, replace worn flights on screws, apply wear-resistant coatings to pump bodies and volutes, and thermal spray coatings like arc spray and tungsten carbide to equipment. An example described is refurbishing a worn spectro rotor by reshaping teeth, adding tool steel edges, blasting and applying a hard coating.

1. DCL ENGINEERING GROUP
DCL E ng ineer i ng G ro up – T he I nno v at iv e E dg e in E ng ineer i ng So lutio ns
27 Malta Street
Fairfield East
NSW 2165
Ph: (02) 9754 1300
Fax: (02) 9754 1400
www.dcleng.com.au
Technical Bulletin
Pulp and Paper
No: 81 11 1
Issu ed: 2 00 6
Rotor Pulpers of varying sizes
are subjected to extremely high
rates of wear, particularly on the
leading edges. Any loose or
damaged material is first
removed by hand dressing.
Large areas of wear are then re-
shaped with weld, prior to a final
hardface weld overlay.
This FF400 screw has been badly
worn in service. Where
necessary flights are removed
and replaced with new ones.
After fully welding flights to the
barrel they are proof ground, set
up on the PTA System and
hardfaced with either a Stellite or
tungsten carbide alloy to
increase in-service life.
DCL Surface Engineering can overhaul pumps that
have worn in service. The pump body may need a
wear resistant coating applied to wet areas. Wear
rings may need to be re-machined oversize or
replaced with a sleeve. For pumps working in
extremely erosive conditions a pump volute may
require a metal spray coating of tungsten carbide.

2. DCL ENGINEERING GROUP
DCL E ng ineer i ng G ro up – T he I nno v at iv e E dg e in E ng ineer i ng So lutio ns
27 Malta Street
Fairfield East
NSW 2165
Ph: (02) 9754 1300
Fax: (02) 9754 1400
www.dcleng.com.au
The process of manufacturing Pulp and Paper creates aggressive
environments involving high rates of wear, corrosion and erosion. With
our ‘One Stop Shop’ philosophy
the DCL Engineering Group is well
positioned to offer a broad cross
section of solutions including a
range of thermal spray processes
such as Arc Spray and High
Velocity tungsten carbide coatings.
The Spectro Rotor pictured to the
right arrived at our shop in a badly
worn condition. After re-shaping
the teeth and protecting the
leading edges with tool steel the
outside surfaces of the barrel are
grit blasted to a Class 3 White
Metal Finish to AS 1627/4 using
Aluminium Oxide Grit. The blasted
surface is then sprayed with a
hard, wear resistant coating
designed to improve the in-service
life at an economical price.
A Double Ended Spectro Rotor
prior to refurbishing
For further information regarding any of the above applications
please contact one of our team at DCL Surface Engineering.
Managing Director Greg Green 0418 167 666