Permission to use the attached copyrighted document provided to the U.S. EPA by email dated 

November 3, 2009 from J. Sloesen, Weir Minerals Netherlands b.v., to Steve Souders, U.S. EPA. 
The crankshaft unit of the GEHO® piston diaphragm pump.

GEHO® Info for sales representatives 

Volume 5, No. 4, September 1995

First full-scale fly ash disposal installation in 

Australia 

Bayswater Power Station in New South 

Wales has put the first full-scale commercial fly ash disposal installation in 

Australia into operation. 

Bayswater is one of six thermal power 

stations owned by Pacific Power in the 

state. Pacific Power has selected two 

GEHO® piston diaphragm pumps, 

model TZPM 1600, for transporting fly 

ash to the disposal area. The piston 

diaphragm pumps are replacing conventional lean slurry pumps to dispose of fly 

ash and furnace ash. 

High density slurry transport 

The giant TZPM 1600 piston diaphragm 

pumps, each weighing approximately 57 

tonnes, will transport 250 m3

/h of fly ash 

slurry from the 4x660 MW power station 

to a primary ash disposal, open cut mine 

site at Ravensworth, 11 km away. The 

dense phase slurry is transported 

through 200 mm diameter pipes at a 

maximum solids concentration of 74% 

and an operating discharge pressure of 

9.2 MPa. 

To remove blockages, each DC-driven 

TZPM 1600 is equally capable of operating at a minimum of 20 m3

/h at 15 MPa. 

The pumps, which have a guaranteed 

availability of 98%, form part of the fly 

ash handling and transport plant, engineered and constructed at Bayswater 

Power Station by John Holland Construction & Engineering Pty. Ltd. 

Need for alterna-tive disposal site 

This fly ash disposal 

installation follows 

the successful commissioning in 1987 

of a pilot plant 

project at Vales 

Point Power Station, 

also in NSW. 

Previously, the 

Bayswater Power 

Station used 

conventional lean 

slurry pumps to 

dispose of both fly 

ash and furnace ash 

at a local ash dam. 

The dam's limited 

storage capacity, 
Diagram showing the typical slope if high 

density slurry has the correct consistency. 

however, prompted the need for an alternative disposal site. 

The GEHO® piston diaphragm pumps 

are capable of transporting high concentrated slurries, making a 'dry' disposal 

method possible. The high concentrated 

'thick' slurry runs out slowly over the 

disposal site after leaving the pipeline. 

Normally no water is set free of the 

slurry, depending on the ash characteristics. 

The high density disposal method offers 

several significant advantages, such as; 

• Longer use of same size disposal 

site, due to a reduction in volume. 

• Decrease in water usage. Generally, 

dense fly ash slurries use 1 litre water to 1 kg ash in stead of 10 litres/1 

kg. 

• Dense fly ash slurries do not flow out 

on a horizontal surface, but from a 

shallow cone at the point of discharge. A typical slope of 2-6% will 

be generated in the disposal site. 

Patented features important in selection process

Bayswater Power Station was impressed by the many patented features 

of the TZPM 1600, including: 

• UP-TIME® valves with exceptional 

wear life, 

• diaphragm stroke control system for 

high pressures, 

• unique high pressure design diaphragm housings. 

The slurry pump's capability is further 

enhanced by a preformed rubber diaphragm, which prevents abrasive slurries from coming into contact with moving parts, such as pistons, piston rods, 

cylinder liners and packings. 

The pump's design ensures mechanical 

efficiencies as high as 95%, as well as 

low energy consumption. In addition, 

because the pump's only wear parts are 

its suction and discharge valves, operating and maintenance costs are extremely low. 

GEHO® pumps have made significant 

technological advancements in slurry 

pipeline technology, which provide a 

more reliable and economical solution 

for high pressure, long distance transportation of granular, abrasive and high 

specific gravity. 

Weir Minerals Netherlands b.v. 

P.O. Box 249, NL-5900 AE Venlo 

Phone: +31(0)77-3895200 

Fax: +31(0)77-3824844 

Email: weir@weirminerals.com

Website: www.weirminerals.com

Copyright © 1995, Weir Minerals Netherlands b.v. All 

rights reserved.