pipe suuports fabrication
pipe suuports fabrication
(OP)
WE NEED TO FABRICATE BOX TYPE STEEL SUPPORTS FOR STEEM LINES, FEED WATER LINES WITH THE HELP OF CARBON STEEL CHANNELS TO FORM AS CLOSED BOX SECTIONS BY WELDING THE EDGES. IS IT NESSARY TO GASCUT /GRIND THE CHANNEL EDGES TO FACLITATE FULL PENETRATION WELDING BETWEEN TWO CHANNELS. WHAT IS THE PRATICE IN INDUSRY. DESIGN DRAWINGS ARE SILENT ABOUT IT. INDIAN STANDARDS SUGGEST GRINDIG, AND WELDING WITH BACKING STRIP TO OBTAIN FULL PENETRATION FOR SIMILAR APPLICATIONS.





RE: pipe suuports fabrication
I would suggest you reconsider the use of closed box sections for pipe supports. We have these on our plant which has been operating for in excess of 20 years and we have corrosion problems with the closed sections which were used in those days. Our policy now is not to use closed sections since you cannot see the internal corrosion which will inevitably occur.
RE: pipe suuports fabrication
Regards
MB44
RE: pipe suuports fabrication
All the installations I saw, used stitch welds and not full welds. Actually I am unaware of such an Indian standard. Which standard you are referring to?
Regards,
RE: pipe suuports fabrication
-MOST IMPORANT COSIDARATION IN USE OF BOX SECTIONS IS THEIR FAR GREATER TORSIONAL RESISTANCE COMPARED TO OPEN SECTIONS.
IT IS FOR THIS REASON BOX SECTIONS ARE USED WHERE SEISMIC CONSIDARATION IS A FACTORTO IMPROVE THE TORSIONAL RIGIDTY.TO IMPROVE M.I. THE CLOSED BOXES ARE FILLED WITH CONCRETE. THIS MAY GIVE CORRISION PROTECTION TOO. BUT IT MAY NOT BE POSSIBLE PRACTICALLY FILL IN ALL MEMERS TO WITH COCRETE. USE PUFF IS NOT A BAD IDEA .INSTED WE CAN PAINT INSIDE AS WELL BY SUTABLE METHOD. ALL THESE ARE NOT ESSENTIAL ONCE THE BOX IS WEDED AND LEAK TIGHT. REGARDIG RELAVANT INDIAN STANDATRD I WILL COME BACK.
RE: pipe suuports fabrication
This is with reference to your comments regarding Indian standard ref. in my thread. The relevant I.S. is I.S.Sructural engineering hand book S.P(6)2, and S.P(6)3 which gives typ. welding details of box sections made from I.S channels