RETUBEING OF SHELL & TUBE TYPE HEAT EXCHANGER

Manufacturing tube bundles and retubing of heat exchanger equipment can be utilised for liquid-to-liquid or steam-to-liquid applications. The bundles can be used for applications including industrial processes and commercial water heating or cooling. In this case with straight tube bundles, we design, manufacture and remanufacture U-tube bundles for both new and existing applications according to customer requirements.
We can construct any existing bundle to include dimensions, material and performance as same as OEM. We are also able to build U-tube bundles, straight tubes, and "floating" tube sheet bundles. Tubes can be plain, finned (internal or external) with many methods for tube side/shell side enhancement available.

PROCEDURE OF RETUBEING OF SHELL AND TUBE TYPE HEAT EXCHANGER

• STEP 1: TUBE CUTTING
  In existing tube of shell and tube type heat exchanger both side cutting is done with the help of Krais make Minicut.
• STEP 2: TUBE PULLING
  Cutting of one side of tube is followed by pulling of existing tube using Krais make Tube-puller CP-1000.
• STEP 3: TUBE SHEET REFURBISHMENT
  Due to corrosive environment and prolonged use, tube sheet of the heat exchanger is corroded. Also dust and junk particles sticks on its surface. So for leak proofing we need refurbishment of tube sheet. We do this with the help of abrasive disc.
• STEP 4: TUBE ROLLING/ TUBE EXPANDING
  Tubes are properly inserted in tube sheet. For straight type heat exchanger, they are bonded with tube sheet on both side using Krais TES Mini 2 with Motor and Push-pull K50 expander. For U-tube bundle type heat exchanger bonding is done from one side only
• STEP 5: TUBE FACING
  Tubes are levelled with tube sheet by facing them with the help of abrasive disc.
• STEP 6: LEAK TESTING
  Bonding of all the tubes is tested by hydro and pneumatic test at 300 PSIG and 350 PSIG respectively