Questions & Answers

Question 170.. spiral wound gasket sometimes like a satellite dish...

Hi Wern,

Why does the outer ring of a spiral wound gasket (with inner and outer rings) sometimes get warped (like a satellite dish) when installed?

What do you think?

Question 169.. have you ever seen formulas weights buttweld fittings

Good morning !
A (probably somewhat odd) question for you, if I may.. have you ever seen formulas (plural because I'm assuming that there would need to be a different one for each different fitting or flange configuration) which would allow a user to calculate the weights for items by supplying the fitting / flange diameters and the wall thickness (both in inches)?

I need to create an Excel spreadsheet from which weights can be drawn for 1/2" through 60" fittings and flanges in a myriad of different wall thicknesses...but using a PDF, a book or a website as a source for all the fittings / flanges that don't appear in, for instance, the Weldbend or Hackney / Ladish literature, would likely be mind-numbing and incredibly time consuming.

I guess I was hoping that there would be formulas that could generate the weights for all of the LR 90° elbows, SR 90° elbows, 45° elbows, Tees / Reducing Tees, Concs / Eccs, Caps, etc. based on the size and the wall thickness, so that I could cover almost all of the possible options without having to resort to a huge amount of manual data entry.

Have you ever seen or heard of such a thing? Any assistance you could provide would be greatly appreciated.

Answer from Werner Sölken

Hi, Mike Hammock

ASME buttweld fitting specifications do not specify weights for fittings. Buttweld Fitting Weights quoted in the tables on this website are based on manufacturers information and should be considered as approximate and provided as a guide only (fitting weights can vary considerably between manufacturers due to differences in construction).

Formula to calculate the weight of a Buttweld Fitting

I found some formulas on http://www.tkbend.co.kr/

I tested the formula Elbows, and the outcome is acceptable.

greetings Werner

Question 168.. we are searching for european din tables - measurements of spades

Dear supplier,
We are searching for European DIN - tables or DIN - measurements of spades.
Could you provide this to us please?

Thank you for your feedback.
With kind regards,
Christoph

Dear supplier,

Thank you for the received information.
This is very helpful.

With kind regards,

Question 167.. can you provide any recommendation for which of the two would be best?

Hi,

We are trying to figure out what will be the best branch connection to make on the wall of our hydraulic cylinder. To date we have welded a pipe into a socket made into the cylinder wall but our application is 24/7 continuous running and we think the cycling of the cylinder wall from low pressure to high pressure (up to 3000 psi) is pushing out the wall underneath the socket weld and fatiguing the weld with so many cycles and getting multiple failures.

We are trying to decide between making a weldolet (minimize stress concentration and provide integral reinforcement) or sweepolet (for low stresses and long fatigue life) connection to the side of the hydraulic cylinder moving forward for our application and which is better in our continuous cycling application.

Also, would either of these connection types require additional re-enforcement like they do with pressure vessel nozzle (re-enforcement pad picture below)?

The sweepolet makes specific reference to fatigue but still not certain which of the two branch connection concepts would be the absolute best for our application.

Can you provide any recommendation for which of the two would be best?

Where would one acquire such fittings in the Alberta, Canada area?

Regards
Evan

Answer from Werner Sölken

Hi Evan,

Above.. I have made your image a little smaller; but the question/answer remains the same.

See the sketch below.

The Full Penetration Welds, minimize stress concentration and provide integral reinforcement.

Question 2

I'm not familiar with suppliers in Alberta, Canada, but there will be no doubt someone, which you can supply the materials.

greetings Werner

Question 166.. thank you for featuring Sir M Visvesvaraya on your website

Regards
Prasad Kailaje

Question 165.. does B16.5-2013 have any requirements for tolerances on flange outside diameters?

Question 164.. Hi i'm pipeing university student and need some information about the attached flange

Dear sir

Hi i'm pipeing university student and need some information about the attached flange.

Specifications.. 4 1/16", BLRJ, R37, API 3000, 60K, P/N.. H126258.V, Made by italy
Could you help me about this flange please?

Thanks and best regards

Question 163.. do you have any information, about elbows above 3r?

Hello Werner,
My Boss said he use to get pipe and it came in 3R or 6R for elbows of steel pipe.
I have only been able to find 3R and I have no Idea what the 3R and 6R rating would be or do to the pipe.
Do you have any information, or can point me in the right direction..

Steve Burgess

Answer from Werner Sölken

Hi Steve,

I have ONE boss, and that's my wife!

On page Elbows i write about elbows to 1.1/2D/3D.

Here below, for example, you will find the
center to face distance of NPS 2 elbows
(the A distance on the image)

1. 90°-LR.. = 1.1/2 x 2(NPS) x 25.4 A=76.2 mm

2. 180°-LR.. = 2 times the 90° LR elbow A=152.4 mm

3. 90°-SR.. = 2(NPS) x 25.4 A=50.8 mm

4. 180°-SR.. = 2 times the 90° SR elbow A=101.6 mm

3D elbows as an example, are calculated with..
3(D) x 2(NPS) x 25.4

greetings Werner

Question 162.. my question should be incredibly simple

Hello Werner,
Thanks for a great reference site. After reading up on schedules and classes I can fully appreciate the need for a simple website. My question should be incredibly simple. If I thread schedule 40 pipe does it become a fitting.. How do I get the pressure rating? Do I use the material and thread depth to get the wall size and then do the pressure calculations? What if I buy threaded pipe (like nipples). If so, do pressure ratings on pipe really have any practical use if they will almost always be invalid once they are installed (because the joining method will change the ratings)? The only process that I can think of where the rating stays the same is a compression fitting.

May I suggest a search function and date on your question page. This would really help.

Thanks again
Regards,
Rod Barham

Question 161.. i would like to enquire regarding about high pressure water...

Hi,
I would like to enquire regarding about High pressure water testing hand pump.
Kindly could you able to advise us the pump that testing pressure shall be 250 Bar.

Regards
D.Thirupathi

Answer from Werner Sölken

Hi D.Thirupathi,

Take a look at.. www.uraca.com

greetings Werner