Yorkshire Water has gone out to tender with a contract for nitrogen purging and digester maintenance across all of its sites worth an estimated £4.8 million.

The works will consist of reactive works and larger planned schemes and will form part of the Asset Integrity team’s delivery of process safety works

These services are vital to supporting safety and compliance across YW’s business. This directly links to the business commitments and performance measures contained within Yorkshire Water’s business plan. YW therefore intends to establish a framework for Nitrogen Purging and Digester Maintenance.

The water company is looking to establish a framework covering services relating to nitrogen purging and digester maintenance. the scope falls broadly in 3 main areas:

• Gas purging of primary sludge digesters, gas holders and associated pipework within the current asset profile;
• Interior cleaning of digesters, pre-and post-digestion vessels including consolidation, buffer, pathogen kill, pre-dewatering and storm tanks, lagoons, ASP lanes and ditches, where cleaning and separation of materials is required;
• Refurbishment works to digesters and gas holders including decommissioning and re-commissioning, repairs and recoating of any concrete, repair or replacement of steelwork, design works to facilitate refurbishment, repair and or replacement to any pipework (sludge and gas).

Yorkshire Water said the contract will be single source with the successful supplier being able to provide all the required services across the entire range of YW’s assets.

Initial contract term is for 5 years with a further potential 3 year extension option.

Time limit for receipt of tenders or requests to participate is 12^th July 2019 – click here to access the tender documentation.