### 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® p iston dia p hra g m p um p

. 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 SouthWales 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 pistondiaphragm 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 m 3 /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-drivenTZPM 1600 is equally capable of operating at a minimum of 20 m 3 /h at 15 MPa. The pumps, which have a guaranteed availability of 98%, form part of the flyash handling and transport plant, engineered and constructed at BayswaterPower 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 pumpsare 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 theslurry, 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 ashallow 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 furtherenhanced 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 areits 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 solutionfor 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.