Verify the thickness required from formula stated in ASME B 31.3 para 304.3.3.b.
Designers usually keep thickness of RF pad on higher side because welding of thinner RF pads can cause twisting. If this is the case weld it in 4 peices.
If you want to weld two peices and achieve combined thickness then try the following procedure
Weld one pad. Place the other one over it. Drill holes of 12 - 16 mm on the second pad and fill them by welding fusing them with bottom pad. Tack weld at several places.
Ammar Shaikh
On Thu, Sep 6, 2012 at 4:46 PM, Alpesh Sakhreliya <alpeshsakhreliya@gmail.com> wrote:
2) MSS SP 75 & ASME 16.49 FOR USE "BAR TEE" AND FLOW TEE
ALPESH SAKHRELIYA
On Thursday, 6 September 2012 02:24:57 UTC+5:30, Abhishek Ghosh wrote:
--Dear Experts ..
Please clarify ::Q1. In Branch connection , Usage of RF pad depends upon which factors??. Is B 31.3 states any requirement ??Q2. Which code specifies dimension of "Bar Tee" used for pipeline Pigging? ( 52 " ) ?Q3. In our project , we have to weld 52 " ( 19.1 mm) x 18 "( std sch) branch ( Stub In) with RF pad. Header pipe thickness 19.1 mm.In ISO, it is mentioned to use RF pad of thickness 38.2 mm, But we have material of 19.1 mm thickness at site , issued by client.Is it really possible to weld two 19.1 mm ( 2 x 19.1 mm= 38.2 mm) Rf pad to make it 38.2mm ?? If yes , what will be the weld joint configuration??Thank you for your valuable time.With Regards.ABHISHEK GHOSH
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