Alfa Laval PHE, Manual

Page: 23 / 24

Maintenance English
3490008529 rev 2012-01
Plate Heat Exchanger -23 EN
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Pressure test after maintenance
Before start-up of production, whenever plates or
gaskets have been removed, inserted or exchanged,
it is strongly recommended to perform a pressure
test to confirm the internal and external sealing func-
tion of the PHE. At this test, one media side at a time
must be tested with the other side open to the ambi-
ent pressure.
The recommended test time is 10 minutes for each
media.
Please consult the local office/representative of the
supplier for advice on the pressure testing proce-
dure.
Regasketing
The procedures below regards Field gaskets, Ring
gaskets and End gaskets.
Clip-on
1
Open the PHE, refer to “Opening” on
page 19 , and remove the plate that is to
have a new gasket.
2
Remove the old gasket.
3
Assure that all sealing surfaces are dry,
clean and free of foreign matter such as fat,
grease or similar.
4
Check the gasket and remove rubber resid-
ual before attaching it.
5
Attach the clip-on gasket to the plate. Slip
the gasket tabs under the edge of the plate.
6
Repeat the procedure until all plates that is
needed to be regasketed is done.
Close the PHE according to
“Closing” on
page 22 .
Caution!
The pressure testing shall be performed at a pressure
equal to the operating pressure of the actual unit but
never above the design pressure as stated on the
nameplate.
Note!
Before removing the old gaskets check how it is
attached.
Note!
Before opening the PHE check the warranty conditions.
If any doubt contact Alfa Laval sales representative.
Refer to
“Warranty conditions” on page 2 .
Note!
Especially the end plate gasket!
Note!
Make sure the two gasket prongs are in correct posi-
tion.