Flange joint protection on 3km sewage lines

Citation

(2000), "Flange joint protection on 3km sewage lines", Anti-Corrosion Methods and Materials, Vol. 47 No. 1. https://doi.org/10.1108/acmm.2000.12847aab.016

Flange joint protection on 3km sewage lines

Keywords Northumbrian Water, Winn and Coales, Flanges, Sewage, Pipelines, Corrosion prevention

Part of Northumbrian Water's multi-million pound expenditure on the upgrading of sewage treatment in the North East includes a new sewage treatment works at Amble, together with a new pumping station at the nearby sea outfall. Consultants for the two contracts involved are Binnie Ferguson McIlveen. Contractors for the first contract are John Mowlem & Company plc, based in Gateshead.

The first contract, now well under way, involves the laying of two 12km transfer sewage pipelines, one of 600mm and the other 450mm diameter, from the new outfall pumping station to the site of the new treatment works. The treated sewage will then return by gravity to the outfall. The second contract is the construction of the sewage treatment works.

Following the consultant's recommendation, Northumbrian Water has chosen Winn & Coales Denso protection for all flanges and VJ joints in both contracts. The joints and flanges are first treated with Denso paste, followed by Denso profiling mastic to smooth the profile of the joints, and then Denso tape is applied to the PI water industry specification.

Winn & Coales also reports that the Medway Power Station in the Isle of Grain, Kent, has used its Archco-Rigidon 423D and 623D corrosion resistant materials to extend considerably the life of an existing storage tank for warm neutralised effluent. The lining of the 12m high x 5m diameter tank was carried out by contractors Shutdown Maintenance Services. The tank handles caustic and acidic chemicals, often in turbulent, erosive conditions and the station engineer wanted to extend the tank's life before the onset of any corrosion.

Archco-Rigidon 423D glass flake vinyl ester was spray applied to the roof and walls and Archco-Rigidon 623D vinyl ester/glass cloth laminate system was hand and roller applied to give optimum corrosion protection and flexible strength to the floor areas and 2m up the walls. Shutdown Maintenance Services technical staff, under the supervision of the power station maintenance engineers, carried out testing of the systems before installation.

Details available from: Winn & Coales (Denso) Ltd. Tel: + 44 (0) 181-670 7511; Fax: + 44 (0) 181-761 2456.