Question and Answer 71-80 www.wermac.org

Question 80 i only wish i could take it with me on my laptop when going offshore

Hi Werner,
I am working in oil and gas as a surveyor and just stumbled across your "Explore the World of Piping" website because I was looking for some sizes of a Slip On flange. I have been surfing through the content for a while now and had to send the email to congratulate you on it. It is brilliant! It is not only the content but also the clear and "light - weight" design which I like.
I only wish I could take it with me on my laptop when going offshore.

Keep up the good work and best regards,
Frank Fuhrmann

Answer from Werner Sölken

Hi Frank,
Thanks for your compliments on my website.
I'm sure my website is offshore reachable...try!

greetings Werner

Question 79: tolerance on the height of the raised face on a 4" 150lb blind

Does anyone know the tolerance on the height of the raised face on a 4" 150lb blind, the height is 1.6 plus or minus?? not the dia.

Regards Darren

Answer from Werner Sölken

ASME B16.5 says:

  1. Outside diameter, 2.0 mm (0.06 in.) raised face, ±1.0 mm (±0.03 in.).
  2. Outside diameter, 7.0 mm (0.25 in.) raised face, ±0.5 mm (±0.02 in.).

There is no tolerance given for the height of the Raised Face.

greetings Werner

Question 78: does the pressure class of a flange relate to the bolt load?

I was looking through your website. I had a question on pressure class. Does the pressure class of a flange relate to the bolt load? For instance, if I had a class 300 flange, would I need a combined bolt load of 300 lbf on the bolts to hold the flange together? I really appreciate your time in this.

Thank you very much and I look forward to your response.

Best Regards,
Jean Paul Melencio
Design Engineer

Answer from Werner Sölken

Jean Paul,
Yes, the bolt load refers to the pressure rating of a flange. However, there are several factors that determine the bolt load. Gasket type, thickness and width of gasket, material and type of flange, material and diameter of bolts, design / process temperature etc..
How to calculate the bolt load, I can not briefly describe, because it probably includes several pages.
ASME PCC-1 Guidelines for Pressure Boundary Bolted Flange Joint Assembly, tells you everything you want to know.
In the near future I will write an article about bolt load related to pipe flanges.

greetings Werner

Question 77: i incidentally want to your website and collect huge knowledge

Dear Werner,
I incidentally want to your website and collect huge knowledge needed for my job.
I guess that you may have many letter like this sending to you.
However, from my heart, I would like to thank you!
Sincerely thanks to your valuable contribution !!!

Ta Nhat Quang
Vice Director

Answer from Werner Sölken

thx

Question 76: what is the difference between size to size weldolet & and reducing?

Sir,
What is the difference between size to size weldolet & reducing weldolet? And how can I specify the weldolet class? Standards or extra strong?

Thanks
Ali

Answer from Werner Sölken

Hi Ali,

Size on Size:
Inner dia of the o'let is roughly equal to inside dia of header pipe

Reducing o'let:
Inner dia of the o'let is always smaller, as the inside dia of the header pipe

Wall Thickness:
Specification of the o'let: depends on the pipe spec wall thickness

Weldolet Size on Size

Weldolet reducing

Above illustrations should give you an impression...

greetings Werner

Question 75: dia inches = circumference x no. of welds

Hi, I want to ask about weld dia-inches, I could not find any authentic method for the calculation of dia-inches for welding of pipes, as some says that:

Dia Inches = Circumference x No. Of Welds
And some says:
Dia Inches = Outside Dia of Pipe x No. Of Welds

Kindly clarify me about the subject mater, with the help of your experience. An early response from your side will be highly appreciated for me. Thanking you

Kind Regards,
Umair Ahmed | Trainee Engineer Piping

Answer from Werner Sölken

Hi Umair Ahmed,

Both mean the same.

Circumference of the pipe:

Pi x diameter
Pi = 3.14

Diameter = 14 inch
3.14 x 14 = 43.96 inch circumference
Multiply that times the number of weld passes.

Q: May I know what you want to calculate?

greetings Werner

About your answer of question 75, how could both mean same, as a factor of 3.14 is multiple in one case and is not with the other case?. And answer to your question that why I need this, I wanted to calculate the total weld length of plant against each NPS pipe, because our client wants this from us, as we are an engineering (Design) firm in oil and gas sector. My question was not for man hour calculation for welding, which is a separate case.

Kind Regards,
Umair Ahmed | Trainee Engineer Piping

Answer from Werner Sölken

Hi Umair Ahmed,

I think I understand what you meant (or what your client intended).
After next weekend, you will find my answer.
I wish you and your family a special New Year 2012.

greetings Werner

Question 74: spec break - some lines classes

Dear Sir,
In the picture below, some lines which Class is BL3 (300#) has been welded directly to line class AL3 (150#). Please give me your advice about this.
1. Is that right or wrong?
2. How to Hydro testing for these lines?
I am looking forward to hearing from you soon.

Spec Break

Thanks & Regards!
Nguyen Anh Tung (Mr)
Piping Engineer - Package Engineer BD1 Project

Answer from Werner Sölken

Hi Nguyen Anh Tung, (Sorry for my late reply)

Example:
You have a straight pipeline where at one end a flange Class 150 is mounted and on the other end a flange Class 300.
In the middle of that line you have made a weld that indicates a spec break from Class 150 to Class 300.

If a pressure test is needed for that pipeline you have a little problem.

Officially, the line must be tested at the lowest pressure class, in your case Class 150.
That means that Class 300 can not be tested on the appropriate values.

Solution:
A flange connection, instead of the weld gives the ability to pressure testing both parts of the pipeline.
Generally a spec break is almost always at a flange connection, with or without a Valve.

Maybe there are other solutions, but then I know the pipe thickness (Schedule) of both systems.

greetings Werner

Question 73: please explain to me about camlock coupling, vicatulic coupling

Dear Werner,
I'm a regular user of wermac. The site has taught me a lot about piping. I'd like to thank you for the good work in maintaining this site.
Please explain to me about Camlock coupling, Vicatulic Coupling and Chicago coupling. I'm new to these products.

Best Regards
Suhas Anil
Sr. Sales Engineer

Answer from Werner Sölken

Hi Suhas Anil,
Look at the links below, you will find a brief explanation about your question.

Victaulic® pipe joining systems

Cam Lock and Chicago quick connectors

greetings Werner

Dear Werner,
Thank you very much for your help. You are amazing and you have been very kind to me.
Hope you had a great Christmas and wish you a happy and prosperous new year ahead.
In case if you need any help or any favour from me, please do let me know. I will help in any way I could.
Regards
Suhas Anil

Hi Suhas Anil,

You're one of the few to say thank you!

greetings Werner

Question 72: thank you for your nice and very usefull site

First of all I would like to thank you for your nice and very usefull site. Both our sales people as well as some of our clients make use of it thankfully.
For the "fun" link, attached a nice photo of a pressure vessel where it appears they want to ship over water in a rather small vessel.
For your information I am in the piping business (mostly technical) for almost 20 years now, so in case you may require further information to extend your site please contact me. Maybe I can be of help.

met vriendelijke groeten/Kind Regards/ Mit freundlichen Grüssen,
Cees Kanters
Technical Manager

Answer from Werner Sölken

Hallo Cees,
Bedankt voor de foto. We spreken elkaar nog wel (eens).

greetings Werner

Question 71: i would like to know about Stud Bolts sizes (length of bolts)

Hello Werner,
i have a question about spectacle blinds. i would like to know about Stud Bolts sizes (length of bolts) for spectacle blinds. generally i use asme b 16-5-1996 for them. is it wrong or not?
thanks in advance!
Regards,
Jeyhun

Answer from Werner Sölken

Hi Jeyhun,
Method for Calculating Stud Bolt Lengths

greetings Werner

Questions & Answers

 

Top of Page