In Situ Valve Seat Replacements

Doosan Babcock has developed the capability for the replacement of valve seats whilst leaving the valve in situ. This has the benefit of reducing the amount of man hours, programme time, heat treatment and transportation necessary to recondition the valve. The welding of the replacement seat is carried out to the relevant ASME or European standard to suit the client's needs. Currently we have the capability of renewing seats in the bore size of 6½ inch, and product developments are in hand to increase the operating parameters to 4½ inch bore.

This product was initially developed to replace the Hopkinsons 10" nominal bore valve seat which has a seat bore of 6½ inches. This has been extended to include the Dewrance 10" bore valve, the difference being that a considerable amount of extra weld material is associated with the Dewrance valve seat retaining weld. The initial development for this product catered for 2CRMo and has been extended to modified 9CRMo.

Access to the valve is gained by removing the head gear and all machining and welding activities are then carried out remotely. The benefits gained from the use of this product are:

Reduction in programme time to effect repair to the valve
Restricted space working
Reduction in the resources required to effect the valve repair
All activities retained on site ensuring successful contract management
Requirement for large pipe restraints alleviated
Potential for large bore weld repairs are eliminated

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