SnTMan
Mechanical
- Jan 22, 2005
- 6,794
I have some existing equipment for which the customer wants to reduce the MDMT. The avenue available is UCS-66(b). The resulting MDMT is to be WARMER than -55 F.
This will of course require a detailed examination of each component to determine the UCS-66(b) ratio, and available exemption.
The weld procedures used appear at first look to be impact test qualified to -20 F. The first paragraph of UCS-67 seems to allow the UCS-66(b) exemption to be applied to the weld metal as well. I quote:
"The MDMT used below shall be the MDMT stamped on the nameplate or the exemption temperature of the welded component before applying the temperature reduction permitted by UCS-66(b) or UCS-68(c)."
I can apply the UCS-66(b) exemption and lower the MDMT of the weld metal and HAZ below -20 F.
Agree?
Happy Holidays,
Mike
This will of course require a detailed examination of each component to determine the UCS-66(b) ratio, and available exemption.
The weld procedures used appear at first look to be impact test qualified to -20 F. The first paragraph of UCS-67 seems to allow the UCS-66(b) exemption to be applied to the weld metal as well. I quote:
"The MDMT used below shall be the MDMT stamped on the nameplate or the exemption temperature of the welded component before applying the temperature reduction permitted by UCS-66(b) or UCS-68(c)."
I can apply the UCS-66(b) exemption and lower the MDMT of the weld metal and HAZ below -20 F.
Agree?
Happy Holidays,
Mike
