1997

Goaf

*Fixed plant

*Three liquid-ring vacuum pumps *75kW electric motors/V belt drives

*Manual flow control by recirculation

1,500 actual litre/s

-50 kPa gauge

*Devised process concept

*Sized and specified equipment

*Wrote Functional Specification

*Led design review/HAZOP

*Oversaw mechanical commissioning

1999

Goaf

*Upgraded goaf plant for four vacuum pumps

*Redesign of separators

*Addition of inlet dropout box

*Rework of pipework

2,000 actual litre/s

-50 kPa gauge

*Retained existing process

*Carried out calculations

*Engineered separators, pipework, etc. for detailing by others

1998

Flare

*Vertical stack flare

*Methane from existing goaf plant

*Reduce greenhouse gas emissions under Shell Coal policy

1,100 litre/s

*Devised process concept to modify/connect to goaf plant

*Sized and specified equipment and stack, for detailing by others

1998

In-seam

*Movable plant

*Centrifugal fan

*55kW electric motor/VVVF drive

*Automatic flow control by variable speed

2,000 actual litre/s

-12 kPa gauge

*Devised process concept

*Sized and specified equipment

*Wrote Functional Specification

*Led design review/HAZOP

*Led design team

*Oversaw mechanical commissioning