Pre heating as per ASME SEC I / VIII DIV I

[Vishwas Keskar Welding Manager WELDING]

Specified thickness of the Pipe is 12.7 mm 

Actual thickness measured is 13mm 

Client specified preheating for  12.7 mm (=/>) =75 Deg C

Is preheating is to be decided on specified thickness or  actual thickness?

Any Construction Code back up >

[Chris Sabu]

Preheating is determined by carbon equivalent value.

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THANKS AND REGARDS

CHRIS SABU

0559695451

[Kannayeram Gnanapandithan]

specified thickness. ref iso 15614-1

THANKS & BEST REGARDS,

KG.PANDITHAN, BE, IWE,  CSWIP 3.1,

ISO 9712 Level 2 in VT,

ASNT-Level II in PT,MT,RT & UT,

LA ISO 9001-2015,

International Welding Engineer. 

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

[Kannayeram Gnanapandithan]

not only carbon equivalent, thickness, hydrogen level etc. pl ref ISO 1011-2

THANKS & BEST REGARDS,

KG.PANDITHAN, BE, IWE,  CSWIP 3.1,

ISO 9712 Level 2 in VT,

ASNT-Level II in PT,MT,RT & UT,

LA ISO 9001-2015,

International Welding Engineer. 

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CACY3QXQLbXQprp1m0xJZRqz-8ko0t3xqmrQuirXvei82QcJRHQ%40mail.gmail.com.

[harenath jha]

As far as designers are concerned they talk about specified thickness.

Sometimes thickness may be  bit more or less then the specified thickness but within the tolerance band.