Pulp and Paper
11th February 2009
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.
Range of thermal spray processes
The process of manufacturing Pulp and Paper creates aggressive environments involving high rates of wear, corrosion and erosion. With our 'One Stop Shop' philosophy, 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 below 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.