Instruction Manual Form 5474 January 1999
Design CVX-T
Design CVX-T Steam Cooler Introduction Scope of Manual This instruction manual includes installation, maintenance, and operation information for the CON-TEKR Design CVX-T Steam Cooler. Only personnel qualified through training or experience should install, operate, and maintain a Design CVX-T Steam Cooler. If you have any questions about these instructions, contact your Fisher Controls sales office or sales representative before proceeding.
Description
Principle of Operation The Design CVX-T Steam Cooler incorporates a series of cooling nozzles connected by a manifold (figure 2). The cooling nozzles inject water into the steam flow to reduce the steam temperature. Water flow is controlled by an external spraywater control valve (SWCV) whose position is controlled by the output of the temperature control device, which controls the downstream temperature. The nozzles may be of the AF type installed to inject water just inside the pipe wall inside diameter or a series of nozzles installed on
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Figure 1. Design CVX-T Steam Cooler
a lance which extends into the steam piping, depending on the application. The type of nozzles installed in the lance type design may be either AF, fixed orifice, or drilled hole type depending on the application.
Steam Cooler and Instrumentation Installation The Design CVX-T should be located in an easily accessible location and allow sufficient clearance for nozzle removal. Although the preferred position is with the steam flowing vertical up, the Design CVX-T can also be mounted in the horizontal position. Guidelines contained in bulletin 85.1:015 CON-TEKR Steam Conditioning Valves Installation Guidelines may be a useful reference in designing a system that incorporates a Design CVX-T Steam Cooler.
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The Design CVX-T Steam Cooler (figure 1) provides an inline desuperheater for applications where insertion style desuperheaters have inadequate capacity. The Design CVX-T can also be manufactured with an integral diffuser for use where backpressure on the pressure control valve is required or desirable. A typical installation is a turbine bypass with inadequate room to install a Design CVX-C steam conditioning valve.