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Participant

Join Date: Nov 2015
Posts: 3

R Stamp Requirements

11/10/2015 1:45 AM

Hi all,

If Stainless steel bolts for newly fabricated, U stamped heat exchanger body flange (Shell-tubesheet-channel) are going to be replaced by Carbon steel bolts to conform with client requirements, shall R stamp be required?

Thanks

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Power-User

Join Date: Sep 2015
Posts: 482
#1

Re: R stamp requirements

11/10/2015 5:26 AM

You should post only one, it's clear enough to see on the screen and forum does not tolerate duplicate threads. Wait for a moment the specialists are coming for your query

Reported.

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Hobbies - CNC - New Member Hobbies - DIY Welding - New Member Engineering Fields - Electromechanical Engineering - New Member

Join Date: Aug 2007
Posts: 17863
Good Answers: 312
#2

Re: R Stamp Requirements

11/10/2015 7:59 AM

The Bolts need to be documented

Couple of questions here.

Does your company carry the 'R' Stamp?

Or is the Vessel at a certified shop yet? If it is, they can Document it as such.

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phoenix911
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Join Date: Nov 2015
Posts: 3
#5
In reply to #2

Re: R Stamp Requirements

11/18/2015 3:57 AM

Hi phoenix911, Thanks for your reply. We are the owner of the Heat exhanger which was fabricated and U stamped by a supplier.The equipment was already supplied but bolts were found not acording to our requirements (SS instead of CS). By "documented", do you mean it needs only updating documents (drawings, etc) without making R stamp?

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#7
In reply to #5

Re: R Stamp Requirements

11/18/2015 7:12 AM

It has been quite some time since I was the engineering manager of a ASME shop. So my knowledge is out dated.

I'll tell you what I knew at the time.

There is no welding done on the heat exchanger, so an 'R' stamp is not required.

And the fasteners was always a grey area, because fasteners are replaced periodically

A shell and tube heated exchanger is tested individually,

The Tube is tested, and the shell is tested, the fasteners was a grey area were there was not much on how they are to be handled with the exception of that they had to be an approved material.

And when I asked for the documentation from our supplier (Ferguson), they were actually a little surprised by that, because no one every requested that for fasteners before., but they sent over documentation on it.

And these documentations were only the material and it was very basic.
One thing you can do is call the supplier, they would give you an up to date requirement.

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phoenix911
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Guru

Join Date: Jan 2010
Location: Mineral wells Tx
Posts: 578
Good Answers: 28
#3

Re: R Stamp Requirements

11/11/2015 8:03 AM

The ASME certification for pressure vessels covered up to the first output flange (Nozzle/ Flange)

Bolts and Nuts are design and calculated by ASME B18.2.1& B18.2.2

I suggest you refer to TEMA

Power Boilers
Section I

· S - Power Boilers

· A - Assembly of Power Boilers

· E - Electric Boilers

· M - Miniature Boiler

· PP - Pressure Piping

· V - Boiler Pressure Relief Valves

· PRT - Parts
Fabrication

Heating Boilers
Section IV

· H - Heating Boilers/Cast Iron Sectional Heating Boiler

· HLW - Lined Potable Water Heaters

· HV - Heating Boiler Safety Valves

· PRT - Parts
Fabrication

Pressure Vessels
Section VIII Division 1

· U - Pressure Vessels

· UM - Miniature Pressure Vessels

· UV - Pressure Vessel Pressure Relief Valves

· UD - Pressure Vessel Pressure Relief Devices

Pressure Vessels
Section VIII Division 2

· U2 - Pressure Vessels (Alternative Rules for Pressure Vessels)

Pressure Vessels
Section VIII Division 3

· U3 - High Pressure Vessels

· UV3 - High Pressure Vessel Pressure Relief Valves

UD3 - High
WP

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Guru

Join Date: Jan 2010
Location: Mineral wells Tx
Posts: 578
Good Answers: 28
#4

Re: R Stamp Requirements

11/11/2015 9:26 AM

Nuts and bolts stainless steel can be replaced by carbon steel. They are cheaper. Think to coat them with some epoxy resin like bakelite.

"R" stamp is not required

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Participant

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Posts: 3
#6
In reply to #4

Re: R Stamp Requirements

11/18/2015 4:00 AM

Hi whitephone, thanks for your reply. I was thinking that caculations need to be revised. Hence, R stamp is required. Am I correct? If calculations is revised, would not that require an R stamp?

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Users who posted comments:

fhw (2); Legolaz (1); phoenix911 (2); Whitephone (2)

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