Waste Heat Boilers

Studded tubes are used in Reheaters in refineries and in the Fluidised Bed of an FBC Boiler. The tubes are securely welded with studs to increase the surface area for better heat-transfer. Tube weld can give very closely studded tubes in High Alloy Steels using Automatic Stud Welders. The studs are welded both by an Automatic Drawn Arc Process and by Resistance Welding. On Alloy Steel Pipes Studded with Carbon or Alloy or Stainless Steel Studs both Pre & Post weld heating is carried out on line using state of the art technique. 

Details 

• Tube Size - OD x Thickness x Length 

• Tube Specification - (can give Studding on 5 CP 1/2 M, 9 CP, Mo to S.S.Tubes.)

• Studded Length 

• Unstudded Length at both end 

• Stud Size - Dia x Length x (after weld) 

• Stud Material - can give similar and dissimilar studs right upto 5 CP 1/2 Mo, 9 CP 1/2 Mo to S.S.Tubes 

• Stud Pitch 
  * Circumfereniral - No. of pev. plan (pp) or angular pitch or 
  * Linear Pitch - No. of Stud planes per metre (ppm) 
  * OR Total No. of Studs per tube. 

We have established standard production processes for studding up to following limits:

• Tube Size : 6' NB x Sch.XXS Maximum 

• Tube Specification : ASTM A 335 89 

• Tube Length : 16 mtr. Maximum 

• Unstudded Length required : Minimum 50 mm at each end. 

• Studs : Maximum 13 mm x Min. 12.7 long mm 

• Stud Pitch : 
  *22 Studs per plane (16 Avg. Pitch) 
  *15.9 mm pitch or 63 ppm 
  

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