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DMN-WESTINGHOUSE – THE CASE FOR SERVICE CONTRACTS
element will involve a visual check of every valve body for wear, corrosion and damage and an audible check when the valve is running for any unusual noises. If all is fine, this is noted in the engineers’ report which is issued to the customer. If a valve is showing signs of wear or is
making an unacceptable noise the only viable option is to remove the valve from the line and dismantle it. This is the Maintenance element and while this is best undertaken at DMN’s workshops it can also take place in the customers’ factory. In either case, the DMN technicians will work to a well- established multi-point plan.
DMN-WESTINGHOUSEexplains the advantages of its Service Contract, and shows how the three elements: Service, Maintenance and Refurbishment, keep the valve working for as long as it is economical
I
t isn’t unusual for a DMN- WESTINGHOUSE rotary valve to have a
lifespan in excess of twenty years if it isn’t handling a particularly abrasive or corrosive material. But as with any piece of machinery, the key to a long life is regular servicing through planned maintenance. As we all know, with a process system
the ‘Run it until it falls apart’ mentality is a serious problem-in-waiting. Most companies operate a planned maintenance schedule in some way and service technicians at DMN are more than willing to support a customer’s own maintenance team should the company choose the DIY route. However, over the past few years, an increasing number of customers have chosen to use DMN technicians to handle the maintenance of their rotary and diverter valves either on an ad-hoc basis or through a Service Contract.
The advantage of a Service Contract is
two-fold. Firstly, it can be as flexible as the customer needs it to be. Secondly, there is the additional benefit that customers with Service Contracts are ensured preferential treatment should a problem occur with a DMN rotary or diverter valve. A Service Contract makes good sense.
DMN technicians have all served apprenticeships elsewhere and are DMN factory trained with intimate knowledge
10 MAY 2018 | PROCESS & CONTROL
of the way that valves are designed and assembled. Also, DMN engineers have access to a comprehensive database and technical help should a problem arise that needs additional input. Every DMN rotary valve and diverter
valve carries a twelve month guarantee. After the guarantee period has ended, there are three separate elements in place to keep that valve working for as long as it is economical: Service, Maintenance and Refurbishment.
VALVE INSPECTION When a DMN technician visits a site as agreed in the Service Contract, every valve will be inspected. The Service
VALVE REFURBISHMENT When the valve is dismantled, the rotor itself will be checked for wear to the blades. If the valve has the drive attached, it is an easy job to run the valve in a dry state to check the rotor rotation for excessive noise. If the drive isn’t attached, the rotor is turned manually. Finally, the clearance between the rotor tips and the valve body is checked. At this point, the customer is contacted and is sent an official quotation outlining the total cost for refurbishing the valve. If replacement parts are required these will be separately quoted. The Service and Maintenance elements are covered in the Service Contract and there is no charge at this stage. Once the customer has agreed to the
valve Refurbishment element, work starts to get the valve back to the customer as quickly as possible. The Refurbishment element begins with the removal of any rust or corrosion – subject to ATEX certification. If the valve
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