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User Guide 

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 Plate Type Heat Exchangers, Single plate & Semi-welded - Installation, Commissioning and Maintenance

12 | BC172686461130en-000201

© Danfoss | DCS (ms) | 2019.07

Shut-down

CIP cleaning

Clean-in-Place, CIP cleaning, allows cleaning the

plate heat exchanger without opening it and is

done by circulating cleaning agents in the heat

exchanger.

CIP cleaning of the refrigerant circuit is

not allowed. CIP cleaning can be done

only on the brine circuit.

The use of CIP cleaning is relevant for soluble

fouling only. Prior to CIP cleaning ensure that all

materials in the entire circulation system are

resistant to the cleaning agent/CIP liquid used.

We advise to ask for a confirmation 

from the supplier of the cleaning agent 

that it will not damage the materials in 

the heat exchanger.

Shut-down for a short period

If the plate heat exchanger has to be shut down 

for a short period the following procedure should 

be followed:

•  Gradually close the inlet control valve in the 

  refrigerant (flow 2) circuit whilst maintaining 

  the full flow in the liquid circuit (flow 1)

•  For high temperature applications cool down 

  the heat exchanger to below 40 °C ( 104 °F)

•  Gradually close the inlet control valve in the    

  liquid (flow 1) circuit

•  Switch off the liquid (flow 1) circuit pump

Check maximum allowable working temperature 

on the name-plate mounted on the head of the 

plate heat exchanger before performing CIP 

cleaning. Maximum working temperature should 

not be exceeded at any time. Consult Danfoss if 

in doubt.

If the solution requires recirculation, select a flow

that is as high as possible, and no less than the

service or operation flows.

Follow the instructions from the supplier of the

cleaning agent. For re-circulated cleaning, we

recommend that fluid is circulated in the plate

heat exchanger for no less than 30 minutes.

Rinsing

After using any type of cleaning agent, always

rinse the plate heat exchanger thoroughly with

fresh water. After CIP cleaning, circulate fresh

water for at least 10 minutes.

Cleaning agents guidance

Oil and grease can be removed with a water

emulsifying oil solvent.

Organic and grease cover can be removed with 

sodium hydroxide (NaOH) maximum

concentration 1.5% - max. temp. 85 °C (185 °F).

Mixture for 1.5% concentration = 5 l 30% NaOH

per 100 l water.

Stone and limestone can be removed with nitric

acid (HNO₃) - max. concentration 1.5% - max.

temp. 65 °C.

Mixture for 1.5% concentration = 2.4 l HNO₃

62% per 100 l water.

Nitric acid has an build up effect on the

passivation film of stainless steel.

CAUTION:

Nitric acid and Sodium Hydroxide may 

cause injury to exposed skin, eyes, and 

mucous membranes. Use of protective 

eyewear and gloves is strongly 

recommended.

Shut-down for a long period

If the unit is to be shut down for an extended

period of time then the following procedure

should be followed:

•  Follow steps above

•  Allow unit to reach ambient temperature

•  Ensure a minimum amount of refrigerant in the 

  heat exchanger. Boil off using flow 1 in 

  evaporators or use liquid drain in condensers.

•  Evacuate refrigerant side

•  Drain flow 1 circuit

•  Lubricate threads on the tie bolts

•  Loosen tie bolts according to the instruction 

  in “opening the plate heat exchanger” section 

  until the length of the plate pack reaches:

 

- Single plate: A-measure max. +10%

 

- Semi-welded: A-measure N10%

•  The tie bolts should not be removed or 

  loosened to such an extent that dirt is allowed 

  to enter in-between the plates. It is 

  recommended to attach a warning notice to 

  the plate heat exchanger to remind personnel 

  that the tie bolts need adjustment before the 

  unit can be put back into service

•  Cover the plate pack with black plastic to 

  exclude any sunlight

Maintenance

Summary of Contents for S19

Page 1: ...www PHE danfoss com User Guide Plate Type Heat Exchangers Single plate Semi welded Installation Commissioning and Maintenance...

Page 2: ...port and lifting 9 Piping system 10 Filtration 10 Installing the pipe connections 10 Commissioning 11 Start up process 11 Shut down 12 Shut down for a short period 12 Shut down for a long period 12 Ma...

Page 3: ...and stated on the nameplate The following must always be observed when installing or servicing plate heat exchangers Comply with national local safety regulations Ensure that the heat exchanger is unp...

Page 4: ...pressure Total internal volume Fluids per side Max pressure drop Assembly A measure max Min max working temp 1727 MADE IN DENMARK Plate heat exchanger type S19 IRF76804 12 2018 Serial No Marking Month...

Page 5: ...Side Fluid Ammonia Ethylene glycol 25 00 Liquid viscosity mPa s 0 1855 3 6207 Liquid density kg m3 649 1 1039 1 Liquid heat capacity kJ kg K 4 575 3 755 Liquid thermal conductivity W m K 0 583 0 451 V...

Page 6: ...k consists of single plates fitted with a flow gasket on each plate to seal the plate pack The number of plates size and dimension depend on the thermal output required The number of plates determines...

Page 7: ...by the gasket configuration the plate code index and the plate geometry e g thermal short or thermal long geometry Fig 5 Single plates Left and Right plates and flow Fig 6 Semi welded plates cassette...

Page 8: ...exchanger with a screen plate to prevent the risk of human exposure to the surface and fluids If storing the plate heat exchanger for a longer period of time i e more than one month 30 days the follo...

Page 9: ...tightening elements from the pallet Place straps around opposite bolts on each side of the column 1 Lift the unit vertically from the pallet 2 Remove the pallet securely 3 Slowly lower the heat exchan...

Page 10: ...iping system make earthing to the piping opposite of the plate heat exchanger Never use the heat exchanger for earthing as plates and gaskets might be severely damaged When fitting threaded pipe to th...

Page 11: ...he outlet for pressure equalization and subsequently gradually open the inlet to the heat exchanger Activate the refrigerant system following normal procedure If a high pressure difference is present...

Page 12: ...commend that fluid is circulated in the plate heat exchanger for no less than 30 minutes Rinsing After using any type of cleaning agent always rinse the plate heat exchanger thoroughly with fresh wate...

Page 13: ...ubricant Shut down the heat exchanger as described in section Shut down Make sure the heat exchanger cools down 40 C 104 F The liquid side must be drained and the refrigerant side must be properly eva...

Page 14: ...gents may be used Cassettes are only cleanable on the brine side and all precautions must be taken to avoid any water or cleaning agent entering the welded cassettes Consult a cleaning specialist for...

Page 15: ...eanable When ordering new plates cassettes all data from the nameplate is required New plates cassettes are supplied with complete gaskets ready for immediate installation Gasket replacement Glue free...

Page 16: ...tie bolts and grease the threads Install the long tie bolts and tighten evenly in the numbered order 1 2 3 4 fig 14 until a resistance can be noticed i e the follower shall have a parallel closing mo...

Page 17: ...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 r...

Page 18: ...nded to have the installation and maintenance carried out by properly trained personnel Troubleshooting Problem Possible cause Possible solution Leakage Connection sealing damaged Check the rubber lin...

Page 19: ...co current flow instead of counter current Check direction of pump flows Air trap has developed in the plate package or piping work Ordering parts When ordering spare parts it is important to provide...

Page 20: ...t notice This also applies to products already on order provided that such alterations can be made without subsequential changes being necessary eady agreed All trademarks in this material are propert...

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