Question and Answer 41-50 www.wermac.org

Question 50: thank you for taking the time to put all this information together in one place

I just found your website. I was just recently commenting on how there is no centralized source of information on pipe, Valves, fitting and piping on the internet. I can no longer make that comment! Although I have only scratched the surface of your website, it is, by far, the best I have ever seen. Thank you for taking the time to put all this information together in one place. I am sure our organization will be using the website often. Keep up the great work!

James R. Macek

Answer from Werner Sölken

Hi James,
Thanks for your compliments on my website.
I will continue to provide information, to anyone who is interested.

Unfortunately there are people who abuse my site. Recently I found a "Company" that has copied all content of my entire site, and has it put online under its own name.
I hope that Google and the provider of that person or company can stop this illegal activity.

greetings Werner

Question 49: expansion of a stainless steel tube to be used in refrigeration coils

I would like to know about the expansion of a stainless steel tube to be used in refrigeration coils. What methods are used: hydraulic (and what pressure is required for steel grade 430). Any information will be highly appreciated.

Kind Regards,
Mbuso Yende

Answer from Werner Sölken

Hi Mbuso Yende,
I can not give a answer to your question.

At the moment I work for a company that needs refrigeration units in their daily process.

They use the knowledge of: www.johnsoncontrols.com

greetings Werner

Question 48: i wants to know about the drawbacks of hi-lo in pipe joints (butt weld-v)

Dear Mr.Werner,
I am Arun from India, working as a Piping Engineer.
I wants to know about the drawbacks of Hi-Lo in pipe joints (Butt weld-V).
Pipe was damaged and its shape deformed as a oval shape(18" STD A53 grb).
Fitter tried his level maximum to correct it, but not match in one location around 150mm (4 mm out). I passed the joint and started welding.
I wants to know, it will weaken joint strength. What is the drawback of these concerns.

Thanks in advance
Arun

Answer from Werner Sölken

Hi Arun,
There is a lot of knowledge and work needed, to prefab uneven pipe diameters and may be with different wall thicknesses.
I can not tell from my website how to do that. This is purely a matter of experience.

What I can tell you is: make sure that the preparation (made by your pipefitter) can not be changed during welding.

greetings Werner

Question 47: would this rupture disc need to be set at the same pressure as

Have designed a reactor with design specifications set at -1 / 6 barG including overhead condensers x 2 (water cooled).
To be used under full vacuum as well as slightly positive pressure at various stages of the process.
Normal atmospheric operating pressure +/- 0.5 barG. Reactor volume is 32 m3 and works with Iso Propyl Alcohol with a normal head space of 12m3 at a maximum temperature of 95° C.
Have included an outlet nozzle at DN80 to fit a pressure safety Valve that will exhaust to an external collection tank.
I will install a stainless steel safety Relief Valve at 2.5 barG and would appreciate your thoughts on fitting a rupture disc to run alongside with the safety Valve. Would this rupture disc need to be set at the same pressure as the safety Relief Valve or should it be set at a slightly lower pressure?

Thank You

Answer from Werner Sölken

Well, my name is Werner,
which code (ASME, DIN, or whatever), the reactor is designed?.

Question 46: Stud Bolts made of 21CrMoV5-7 / W1.7709

Hello ! Dear Mr. Sölken,
Thank you very much for the huge work you have made with the website and sharing with us your knowledge.
If is possible to help me with the issue of substitute Stud Bolts made of 21CrMoV5-7 / W1.7709 with A193 B16, substitution not accepted by many engineers.
Is any reasonable reason by not accepting A193 B16 (his similar is W1.7711) instead of W1.7709 and then what ASME material for bolting can replace 21CrMoV5-7 without any other issues?
I need this in many projects and W1.7709 is more expensive and hard to supply than A193 B16.
Many thank again for your work and looking forward after your answer !
Cu stima / Kind Regards,
Bogdan MIRICA

Answer from Werner Sölken

Hello,
I can not help you with your inquiry. I assume that in your specification, bolts and nuts in the quality 21CrMoV5-7 / W1.7709 be requested. There is a reason why this quality is specified. Option, discuss the alternatives with your client.

greetings Werner

Question 45: are the fittings and flange dimensional charts available in imperial?

Are the fittings and flange dimensional charts available in imperial rather than metric?
We are living in the past in the U.S. ! J
Mike Walker

Answer from Werner Sölken

Hi Mike,
YES

greetings Werner

Question 44: while taking my two border collies

Good afternoon Werner,
While taking my two border collies for their lunch time run through the woods across from a sluice a lady with her sheep-dog came along and we started talking.
Her name is Bianca, (whom you undoubtedly know) and she told me about your web-site. Hence this mail.

What a brilliant piece of work it is too !

Although near to retirement, I still work in the Subsea Services Department of Allseas in Delft (The Netherlands). (ROV survey and lay support)
Will pass on your site details to our engineers since there are frequently discussions, especially about the type of flanges they should use. Hope you don't mind the engineering explanation in the mail received from my colleague.

Kind Regards
Karl

Answer from Werner Sölken

Hi Karl,
Normally I place these mails not in "Question and Answers".
But if you've met my wife I make an exception! :-}
Of course I'm very happy that I maybe you and your colleagues can help.
A general answer on flanges, I can not give, but they are the most important components in a pipe line system.
All questions of your colleagues are welcome.

greetings Werner

PS: I've changed some names

Question 43: deleted

Question 42: pressure-temperature rating tables for asme b16.36 orifice flanges

Hello,
I am writing you today because I am curious to know if the flange pressure-temperature rating tables in ASME B16.5 can be applied to orifice flanges as well? As a manufacturer of orifice flanges, I believe you guys may know the answer. ASME B16.36 deals with orifice flanges but does not mention if the pressure and temperature relationship is similar with the non-orifice flanges. I'd like to know the maximum pressure a given orifice flange may hold.
I would very much like your assistance in the matter,

Have a good day,
Stanley Julien

Answer from Werner Sölken

Hello Stanley,
The pressure-temperature ratings, including all use recommendations and limitations, and the method of rating given in ASME B16.5 apply to orifice flanges acc. to ASME B16.36.

greetings Werner

Question 41: toleranties boutgat diameter - tolerances bolt hole diameter

Beste Werner,
Ik heb een vraag. Het antwoordt, als jij deze hebt, kan wellicht een mooie toevoeging zijn aan jouw website:
ASME B16.5-2003 §7 Tolerances:
De nominale dimensies van ASME flenzen worden beschreven in de norm, echter de toleranties van deze dimensies gedeeltelijk. Ik probeer te achterhalen wat de tolerantie op de boutgatdiameter van een ASME flens is ( Website : FLG / Welding Neck Flanges / Dimensie 'L' ). Heb jij enigs idee waar ik deze informatie kan vinden? In de ASME B16.5-2003 norm kan ik hier niets over vinden.Bijvoorbaad dank !

M.vr.gr. / Kind regards
ing. Ron S. Dijkmans

Answer from Werner Sölken

Hello Ron,
The answer is simple: ASME B16.5 gives no tolerances for bolt hole diameters, not even the latest version 2009.

ASME B16.5 Pipe Flanges and Flanged Fittings
Published Interpretations

Interpretation: 2-7
Subject: Bolt Hole Tolerances
Date Issued: June 18, 1990
File: B16-90-09
Question: Does B16.5-1988 have any requirements for tolerances on bolt hole diameters?
Reply: No.

greetings Werner

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