The reconditioning work of PLATE HEAT EXCHANGER is carried out in two stages mainly for plates and third stage is for Frame.
A brief description about each stage follows as below.
STAGE ONE: Stage One Reconditioning work involves the following three steps.
1. RECEIVING INSPECTION
PHE as full equipment or as Plate packs alone are received and undergo stringent check in procedure ensuring the match with customer’s specification for quantity, identity and damage. Any non-conformance will be notified to customers.
2. PLATE CLEANING
The old gaskets are removed with care and the plates are subjected to chemical cleaning. The chemicals chosen depends on the type of fouling & plates MOC. After chemical cleaning and water jet washing, the plates reach to the next step.
The cleaned plates are then inspected for cracks, pin holes or thinning effect and for any deformation if any, 100 % plates shall be subjected to Light box test and 5% of the plates will be subjected to DYE PENETRANT TEST.
STAGE TWO: Stage Two Reconditioning work involves the following three steps. The plates which are passed in the stage 1 of reconditioning shall be taken for stage 2 reconditioning.
The inspected plates are then regasketted with new gaskets by applying special adhesive. The regasketted plates are inspected for proper bonding.
All the regasketted plates are stacked one above other similar to the way it is assembled in frame structure. And equal load will be distributed over the plates and kept for few hours for curing.
3. ASSEMBLY AND HYDROTESTING
The regasketted plates are assembled in the frame as per the design and tightened to the plate pack length. The hydro test will be carried out on both hot side and cold side to the test pressure as per the design of equipment.
|Plate Type||Max Operating Pressure||Max Heat Transfer Surface||Total Dead weight||Max. Volume Per Side|
|90||-1 to 25||33||120-600||36|
|150||-1 to 25||53||160-830||57|
|200||-1 to 25||70||215-1100||190|
|250||-1 to 25||82||510-1820||120|
|400||-1 to 25||115||390-2100||230|
|500||-1 to 25||280||690-4160||370|
|650||-1 to 25||300||700-4700||470|
|850||-1 to 25||500||1000-7000||700|
|1100||-1 to 25||661||1900-9500||1125|
|1500||-1 to 25||750||2400-11780||1505|