Scalby Mills Sewage Pumping Station
Ward & Burke Construction Ltd were contracted by Yorkshire Water to design and construct works to Scalby Mills Sewage Pumping Station (SPS) to eliminate or mitigate the risk associated with flammable and explosive gases arriving at the SPS.
The SPS is housed within a buried structure adjacent to the Sea Life Centre and beneath the North Bay Miniature Railway in a tourist area of Scarborough. The consequences of harmful and explosive gases arriving at the SPS could be catastrophic.
Ward & Burke contracted Sweco to provide process safety support to ensure the risks resulting from the flammable and explosive gases arriving at the SPS were assessed, eliminated, or mitigated. Sweco was chosen for the commission due to our process safety expertise and understanding of both Yorkshire Water’s and the regulatory requirements.
Sweco provided Process Safety support and advice to Ward & Burke Construction Ltd and Yorkshire Water. This involved a structured hazard study process that included:
- Hazardous Area Classification (HAC)
- Access Lifting and Maintenance (ALM) Facilitation
- Cause Consequence Analysis (CCA)
- Cost Benefit Analysis (CBA)
- As Low As Reasonably Practicable (ALARP) Assessment
- Catchment Risk Assessment
- Dangerous Substances and Explosive Atmosphere Regulation (DSEAR) Assessment
- Ventilation Velocity Assessment
- Remedial Action Recommendations
Through thorough and methodical hazard identification and risk mitigation recommendations Sweco was able to provide ‘Safe by Design’ solutions to potentially dangerous and complex problems at the Scalby Mills SPS.
The recommendations made in Sweco’s DSEAR Report were used to determine the scope of the construction works. This included:
- Replace and upgrade the ventilation system within the Scalby Mills SPS structure and transfer the extracted air via a 2km duct to Scarborough STW for odour treatment
- Gas monitoring and alarm system upgrade
- Fire and detection and alarm system upgrade
- Highly Flammable Liquid (HFL) detection and interception in upstream pumping stations
This is one of the most thorough and well written HAC assessments that I have ever encountered. It does great credit to your team.
Peter Coker Principal Engineer at Yorkshire Water