RE: [MW:27297] SS Forged Bar machined to make Pipe for Nozzles Fabrication

To All.

 

Please read through the extracts from ASME Sec-VIII, DIV-1. I would think machining a hollow pipe section from a solid bar stock would not be technically acceptable due to the highlighted clauses as below.

Also the manufacturing routes of seamless pipes and solid bar stocks are different. Seamless pipes are made by "Pilgering"(ref SA312 for example) while solid bars are made by forging.

 

Notes for pipes the starting material could be solid bar stock however the pipes have to be to heat treated following manufacturing. Technically there would be incompatibility of properties , such as flow of grains influencing the mechanical properties.

 

In view of the above clauses and so many technical ifs and buts  it would be worthwhile to stick to the option of seamless stainless pipes, which should be available plenty ex stock in anywhere.

 

This matter should be discussed and proceeded only after discussion with the ASME /Authorised inspector.

 

Thanks.

 

P.Goswami.P.Eng, IWE.

Welding & Metallurgical Specialist

Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/

Email:pgoswami@quickclic.net,pradip.goswami@gmail.com

 

UG-14 RODS AND BARS

(a) Rod and bar stock may be used in pressure vessel construction for pressure parts such as flange rings, stiffening rings, frames for reinforced openings, stays and stay‐bolts, and similar parts. Rod and bar materials shall conform to the requirements for bars or bolting in the applicable part of Subsection C.

 

(b) Except for flanges of all types, hollow cylindrically shaped parts [up to and including NPS 4 (DN 100)] may be machined from rod or bar, provided that the axial length of the part is approximately parallel to the metal flow lines of the stock. – This is an important point to note.

 

 

UCS-12 BARS AND SHAPES

(a) Approved specifications for bar and shape materials of carbon steel are given in Table UCS-23. A tabulation of allowable stress values at different temperatures are given in Table 1A of Section II, Part D.

(b) Bolt materials as described in UCS-10 may be used as bar materials.

(c) Parts made from bars, on which welding is done, shall be of material for which a P‐Number for procedure qualification is given in Section IX, QW‐422 (see UW-5).

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Gurunathan R
Sent: January 25, 2018 8:42 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:27290] SS Forged Bar machined to make Pipe for Nozzles Fabrication

 

Hi Ajay,

 

Yes it is acceptable to use forged rod as nozzle refer UG-14 of ASME SEC VIII Div.1

 

 

Sent from my iPhone

On Jan 25, 2018, at 5:05 PM, Raghuram Bathula <raghurambathula@gmail.com> wrote:

why don't use pipe?

 

On 25 January 2018 at 16:58, 'DOKKU AJAY' via Materials & Welding <materials-welding@googlegroups.com> wrote:

Gents,

 

I have the following query. Appreciate if someone can guide on this:

 

Background: 

Cladded Vessel, Nozzle of Size 2", MOC: CS+SS Cladd/ Overlay, Code of Construction: Sex.VIII Div.1 : Vendor confirms that they cannot do weld overlay of 2" and less size. Alternative confirmed by vendor is to machine the Forged Bar to make 2" SS Pipe. Our Engineering has accepted the replacement of material from engineer point of view i.e from CS+SS Overlay to SS Matl.

 

Query:

 

Is it acceptable from code point of view to used forged item for manufacturing of Nozzle pipe.

 

Regards,

Ajay Kumar Dokku

 

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