RE: [MW:15034] Tube to Tube sheet Welding

Dear ALL,

 

Refer  API 660 more information from D.3.2  and  API 660 - 9.5

 

ASME 

 

 UW-3 WELDED JOINT CATEGORY

When used, the hub of a tubesheet or flat head shall have minimum dimensions in accordance with Fig. UW- 13.3 and shall meet the following requirements: (1) When the hub is integrally forged with the tubesheet or flat head, or is machined from a forging, the hub shall have the minimum tensile strength and elongation specified for the material, measured in the direction parallel to the axis of the vessel. Proof of this shall be furnished

 

UW-20.2 Definitions

UW-20.2(a) Full Strength Weld. A full strength tubeto-tubesheet weld is one in which the design strength is equal to or greater than the axial tube strength, Ft. When the weld in a tube-to-tubesheet joint meets the requirements of UW-20.4, it is a full strength weld and the joint does not require qualification by shear load testing. Such a weld also provides tube joint leak tightness.

 

UW-20.2(b) Partial Strength Weld. A partial strength weld is one in which the design strength is based on the mechanical and thermal axial tube loads (in either direction) that are determined from the actual design conditions. The maximum allowable axial load of this weld may be determined in accordance with UW-20.5, Appendix A, or UW-18(d). When the weld in a tube-to-tubesheet joint meets the requirements of UW-20.5 or UW-18(d), it is a partial strength weld and the joint does not require qualification by shear load testing. Such a weld also provides tube joint leak tightness.

 

refer - FIG. UW-20 SOME ACCEPTABLE TYPES OF TUBESHEET STRENGTH WELDS

Thank & Best Regards,

 

M Veera SAMY- Bureau Veritas.

Coimbatore

 

 

 

> Date: Tue, 7 Aug 2012 07:11:28 +0300
> Subject: [MW:15033] Tube to Tube sheet Welding
> From: biplab.mech@googlemail.com
> To: materials-welding@googlegroups.com
>
> Dear Exparts
>
> I need to do tube to tube-sheet welding verification for SS Materials
> which will be done by Resistance Welding.
> Please help me how to inspect from the begining.
> About WPS, Tests of PQR, WQT.
> Production Weld test- NDT requirement, Hardness etc.
>
> --
> Thanks & Regards
> Biplab Pal
> Mechanical Inspector (PMT)
> YASREF Project
>
> E-mail: biplab.mech@gmail.com
>
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