User Guide
|
Plate Type Heat Exchangers, Single plate & Semi-welded - Installation, Commissioning and Maintenance
© Danfoss | DCS (ms) | 2019.07
BC172686461130en-000201 | 17
Maintenance
(Continued)
Regular Service of the plate heat exchanger
Service sequence – once a year as a minimum
• Check temperatures and flows against
commissioning data
• Check general condition and look for any signs
of leakage
• Wipe clean all painted parts and check surfaces
for signs of damage – “touch up” if necessary
• Check bolts and bars for rust and clean. Coat
threaded parts with molybdenum grease or a
corrosion inhibitor (ensure that no grease, etc.
falls onto the plate gaskets
• If rollers are fitted to the follower, lubricate the
bearings with light machine oil
Clean fluids/normal conditions
Dirty fluids/severe cconditions
Years
after
commis-
sioning
2
PHE audit
Leak
detection
refrigerant
CIP and
manual
cleaning
Replace
ring
gaskets*
3
PHE audit
Leak
detection
refrigerant
CIP
cleaning
5
PHE audit
Replace
ring- and
main body
gaskets**
Leak
detection
refrigerant
CIP and
manual
cleaning
PHE audit
Replace
ring- and
main body
gaskets**
Leak
detection
refrigerant
CIP and
manual
cleaning
6
7
PHE audit
Leak
detection
refrigerant
CIP
cleaning
PHE audit
Leak
detection
refrigerant
CIP &
manual
cleaning
Replace
ring
gaskets*
8
10
Replace
ring- and
main body
gaskets**
Leak
detection
refrigerant
CIP and
manual
cleaning
PHE audit
Replace
ring- and
main body
gaskets**
Leak
detection
refrigerant
CIP &
manual
cleaning
12
13
PHE audit
Leak
detection
refrigerant
CIP
cleaning
PHE audit
Leak
detection
refrigerant
CIP &
manual
cleaning
Replace
ring
gaskets*
15
Fig. 15. Guideline for service intervals for semi-welded plate heat exchangers. Indicative for clean fluids/normal
conditions and dirty fluids/severe temperature-pressure conditions respectively
* Ring gasket kit
** Full gasket kit
Additional service for semi-welded heat exchanger:
PHE audit: Visual inspection of operating conditions, leaks, corrosion and general condition
Leak detection refrigerant: Electronic testing (sniffer)
CIP: Clean in place (See section "clean in place")
Manual cleaning: Plate pack disassembly/plate cleaning
Replace gaskets: Plate pack disassembly/replace gaskets
At extreme fluids/conditions audits should be performed more frequent
