INSTALLATION, OPERATION and MAINTENANCE MANUAL | 51
minute. Operators should monitor and record pressure and temperature
changes in at least the mentioned intervals.
The system, in which the heat exchanger is integrated, needs to provide the necessary
functional components to allow for the specified gradual startup and shutdown. This can
be achieved with variable speed pumps and/or the correct sequence of operating
valves.
After shutdown, the heat exchanger must be allowed to cool naturally to ambient
temperature. If steam is used as a heating media, it must be shut off first. In cooling
duties, the cooling liquid must be shut down first to avoid freezing of the product. All
liquids must be drained from the heat exchanger after shutdown to prevent precipitation
of products or scale buildup. In the case of corrosive media, it may also be necessary to
flush with clean, non-corrosive water.
If the heat exchanger will be out of operation for six months or longer, it must be
correctly prepared for storage. See Section 10.2 for instructions.
Figure 43 shows an example of a typical system configuration for a liquid/liquid
(Cold/Hot) application. Each circuit (Cold and Hot) has a similar configuration. The exact
piping, control arrangement, design and installation is outside of SPX FLOW’s scope
and responsibility.
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