Hewitt Robins & Wileman supply new screen installation for Dolyhir Quarry.

19 Jun 2016

Owned and operated by CRH, Dolyhir Quarry is situated in Old Radnor, Powys, Wales. The site has a very long history of extraction going back to 1680 and today is part of a large complex of separate operations spread over three quarries that encompasses Strines and Old Radnor. Dolyhir Quarry supplies a 65 PSV aggregate which is a top class material for surface dressing which is vital to creating high skid-resistant roads. Approximately 750,000 tonnes/yr of material is supplied by road to local asphalt plants and surface dressing contracts mainly in the south.

Increasing the production:
As part of the production process, Dolyhir has operated a washing plant to wash the stone over an ageing two deck rinsing screen. However, with a replacement screen now required Derbyshire based, bulk handling specialist – Hewitt Robins were asked to tender for a replacement and after site consultation was duly awarded the project. Subsequently, Hewitt Robins supplied a new double deck inclined screen which was 300mm larger in width and length to increase the production of the screen.

Mike Jones – Unit Manager, commented, “We increased the width and length of the screen deck by just one panel and changed to a two-deck to get the material through as fast as we could, using the top deck as a safeguard. We are running it at an average of 100tph which is only restricted by the speed of the conveyor, and with change-over chutes, we can now wash single sizes of 6/10/14mm, which has saved us a lot of time by eliminating screen media changes. We use the new screen purely for rinsing purposes and it is providing a very clean end product.”

Hewitt Robins supplied a V-13 1800mm x 6000mm double deck inclined screen which incorporated:

• Feed box with rubber liners
• Discharge lips with rubber liners
• Support springs
• V-belt drive
• Pulleys
• 22kw drive motor
• Pivoting motor base
• Close fitting drive guard
• Spray bars and nozzles
• Rubber cross member protection

The screen support structure including under pan, discharge chutes, walkway, stairway etc. was supplied and installed by Wileman Engineers of Ashby de la Zouch, Leicestershire.

The whole project was successfully completed and commissioned in early February 2016.
Mike Jones, further commented, “We are very pleased with the installation, it’s a top class screen and was fitted within the prescribed timescale with no issues whatsoever.

Owned and operated by CRH, Dolyhir Quarry is situated in Old Radnor, Powys, Wales. The site has a very long history of extraction going back to 1680 and today is part of a large complex of separate operations spread over three quarries that encompass Strines and Old Radnor. Dolyhir Quarry supplies a 65 PSV aggregate which is a top class material for the surface dressing which is vital to creating high skid-resistant roads. Approximately 750,000 tonnes/yr of material is supplied by road to local asphalt plants and surface dressing contracts mainly in the south.

Increasing the production
As part of the production process, Dolyhir has operated a washing plant to wash the stone over an ageing two deck rinsing screen. However, with a replacement screen now required Derbyshire based, bulk handling specialist – Hewitt Robins were asked to tender for a replacement and after site consultation was duly awarded the project. Subsequently, Hewitt Robins supplied a new double deck inclined screen which was 300mm larger in width and length to increase the production of the screen.

Mike Jones – Unit Manager, commented, “We increased the width and length of the screen deck by just one panel and changed to a two-deck to get the material through as fast as we could, using the top deck as a safeguard. We are running it at an average of 100tph which is only restricted by the speed of the conveyor, and with change-over chutes, we can now wash single sizes of 6/10/14mm, which has saved us a lot of time by eliminating screen media changes. We use the new screen purely for rinsing purposes and it is providing a very clean end product.”

Hewitt Robins supplied a V-13 1800mm x 6000mm double deck inclined screen which incorporated:

  • Feed box with rubber liners
  • Discharge lips with rubber liners
  • Support springs
  • V-belt drive
  • Pulleys
  • 22kw drive motor
  • Pivoting motor base
  • Close fitting drive guard
  • Spray bars and nozzles
  • Rubber cross member protection

The screen support structure including under pan, discharge chutes, walkway, stairway, etc. was supplied and installed by Wileman Engineers of Ashby de la Zouch, Leicestershire.

The whole project was completed and commissioned in early February 2016.

Mike Jones, further commented, “We are very pleased with the installation, it’s a top class screen and was fitted within the prescribed timescale with no issues whatsoever.