3 Operation
3.2.3 Shut-down operation
The heat exchanger must be shut down in a manner that minimises different expansions between shell and tubes. If the
system will be shut down for a shorter period, make sure the unit is filled up with water completely and no air is available in
the system. If the system should be shut down for a longer period and/or the unit should be disconnected from the system, it
is recommended to completely drain the heat exchanger.
If emptying the heat exchanger it is important to dry it completely. Recommended to empty it and then dry it by blow air into it,
to make sure no product nor utility media is left in the unit.
If a small amount of moisture remains in the tubes or shell and when combined with air it might cause corrosion of the stainless
tubes and other parts, hence it is important to secure no moisture is present. To reduce water retention after drainage, the tube
side of the heat exchanger should be blown out with air.
Temperature shocks
The heat exchanger should not be subjected to sudden temperature fluctuations. Hot fluid must not be suddenly introduced
when the unit is cold, nor cold fluid suddenly introduced when the unit is hot.
Bolted joints
The heat exchanger is pressure tested before leaving the manufacturer in accordance with EN 13445 standard requirements for
PED, or in accordance with ASME VIII standard requirements for ASME. However, normal relaxing of the gasketed joints may
occur in the interval between testing at the manufacturer and installation on site. Therefore, all external bolted joints may require
retightening after installation and, if necessary, after the heat exchanger has reached operating temperature.
Recommended bolt tightening procedure
If the bolts are tightened, it is important that they are tightened uniformly and in a diametrically staggered pattern.
1 = Start
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2
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5300-0009
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