14
15
NB
When heat exchangers are combined with droplet separators, their considerable over-
all weight should be taken into account, and the lifting gear and lugs must be in the
correct range. It is essential that the entire unit is supported by a crane or hoist, using
the lugs, until it is bolted into position. If necessary, the combined unit can be provided
with permanent extra support by fixing the lugs to the surrounding support structures.
Do not use the mounting brackets or nozzles to lift the heat exchanger.
Vahterus will assist in the planning of the lifting if needed, and separate lifting instruc-
tions are available. Please contact Vahterus Service.
WARNING!
Do not weld anything to the heat exchanger (including the shell, end plates and the
sides of the pipes) without the manufacturer’s permission, since this could undermine
the durability of its pressure envelope and internal structures.
2.2 Pipes
2.2.1 General
Install the unit so that the piping and heat exchanger can be drained easily. The heat
exchanger is not normally provided with separate drain and ventilation connections. If
your process requires these, they should be installed in the pipelines as close as possi-
ble to the heat exchanger, or, if it is necessary to have them installed in the exchanger,
this should be specified when the exchanger is ordered.
Ensure the following:
1.
All piping to be fixed to the exchanger is to be flushed prior to connecting the unit.
2.
All connections are marked and should be connected according to the GA drawing.
3.
The piping system must be flexible so that thermal expansion does not overload
the nozzles and so that the heat exchanger is not subjected to vibration.
4.
All pipe connections to and from the heat exchanger must be equipped with shut-
off valves. Those with slow valve action are recommended. It should be possible
to increase and reduce flow rates gradually when the system is being shut down
or started.
5.
If there are solids in the process fluids, the use of filters is recommended. Further
information is available from Vahterus Service.
6.
The piping must be equipped with a relief valve to prevent unintentional excess of
design pressure.
7.
If multiple units are being arranged in parallel, the flow should be evenly distribut-
ed amongst the exchangers.
Openable model:
Connections between the plate pack on the openable model and the pipes must be
made either with flange or threaded connections.
