venting of this system to atmosphere gave rise to the odour and required addressing ahead of the 2007 cut-off
date for compliance with the latest regulations.
Mono’s solution was to replace the first stage vacuum pump and pressure vessel with duty/standby progressing
cavity pumps to transfer the blood to the holding tank. A single duty pump has also been installed to transfer the
blood/water mixture to a road tanker for disposal. The new pumping system is entirely enclosed and proved the
most cost-effective solution to achieve Grampian Prepared Meats’ requirements and the necessary compliance.
Another important benefit for the customer was that Mono was also able to design, install and commission the
pumping system, including all necessary pipework, valves and control panel. This meant a ‘complete’ solution giving greater confidence that the process would operate smoothly from beginning to end, compared with a contract
involving several partners.
The compact, duty/standby pumps transfer the chicken blood at a capacity of 6m3/h and a maximum delivery
pressure of 0.74 bar. A larger pump operates at a capacity of 45 m3/h and maximum pressure of 0.43 bar to empty
the holding tank and transfer the blood to the tanker.
Commenting on the installation, the engineering manager at Grampian Prepared Meats, Keith Taylor, said, “The
Mono pumping solution has enabled us to meet PPC obligations and make the working environment more pleasant.
Importantly the work was carried out during programmed shutdown to avoid disruption and after nearly a year of
operation had delivered trouble-free operation as promised.”