Wet Abrasive Blasting

The safest and most efficient way to remove an asbestos residue from the sprayed coating process is the utilisation of a Wet Abrasive Blasting System.

This residue is found when previously sprayed Asbestos was impregnated in a thick glue, bitumen or similar substance, as a primer to coat large metal beams, pipes, undersides of roofing materials, concrete slabs and bricks.  It can be discovered in old basements or areas in which asbestos removal has previously occurred, but not to today’s current standards.

The Process…

An air tight enclosure is built around the area where the asbestos is to be removed and the entire enclosure placed under negative pressure to ensure no fibres can escape, this is then followed by a smoke test.

Once the enclosure has been signed off as completely sealed, the cleaning commences under fully controlled conditions, firstly by removing the overlying loose debris followed by the use of the Wet Abrasive Blasting System.  The ‘wet shot blast’ is designed specifically for this environment and is operated by highly trained teams in complete protective clothing, including full face respirators.

The machines containing the water and abrasive are situated outside of the enclosure so they can be serviced by qualified engineers away from the danger area.  The material is pressure fed through a number of pipes entering through a small hole in the wall which is sealed once the pipes are in place, before the negative pressure tests are carried out.

During the operation external background air monitoring is undertaken on a regular basis by a UKAS accredited laboratory to ensure the control measures are assessed and adequate.

The items being worked upon are stripped back to bare metal, with no traces of asbestos left. The removed asbestos containing material is carefully bagged, sealed and removed to a secure asbestos waste skip via a bag lock system. Here they are cleaned, double bagged and sealed again before being transported to a licensed disposal facility.

Once the entire enclosure is clear of asbestos contamination, the UKAS accredited laboratory will return to undertake the ‘4 Stage Certificate of Re-Occupation’.  On completion of the 4 Stage Clearance procedure the certificate will be issued and left on site.  The Job is then complete and the site cleared.

John F Hunt Environmental continue to explore & develop innovative methods for the safe removal of asbestos containing materials.

Should you need any further information or help, please call us on 01375 366700.