Manufacturing Pressure vessels 1

[gayaz]

Hi,

I am a new Engineer just started working on ASME coded Tanks. My problem is with the manufacturing aspects.
I can design tank according to ASME codes. I face problems as to what welds i have to use in the tank?. what weld from the manufacturing point of view. and how to do fit up of head and shell?. how to mark up the location of nozzeles on shell or head? how to check the shell for roundness?
well i dont know much so any help will be greatly appreciated.

thank you

 

[MJCronin]

gayaz,

Most engineers simply specify all necessary details and then submit these to a fabricator ( with an ASME code stamp) for prices and comment. Necessary information includes: MAWP, shell diameter, head type, materials and a schedule of nozzles including type. I suggest that you visit the Modern Welding Website (

http://www.modweldco.com)and

review the list of details required for a quote.....

It is both useful and important to know what the ASME design rules are and what considerations must be weighed for a Section VIII vessel design. However, the final design details,welding details, actual construction and testing must be certified by the fabricator.

The fabricator must use ASME approved materials, qualified welders and weld procedures.

Hope that this helps !!

MJC

 

[ksuengrng]

One of the best ways to learn the manufacturing aspects of vessels, tanks, nozzles, attachments, and appurtenances is to spend some time in the shop. Get to know the welders and how things are done. They have a wealth of information on fabrication and once they see the engineer taking steps to improve the product by utliziing THEIR input, a mutual respect will grow and you will find out that learning about the fabrication part was the easy step.

In respect to welds and fit-up, most of this is covered in ASME. You will also need to look at your companies weld procedures and have a basic understanding of them. They will help you in designing the vessel and attachments.

Know the code fairly well, and the general area of where to go to get information. Depending on the company, working with the purchasing agent may also provide to be useful. I had a great relationship with our purchasing agent and learned a great deal from him also. Just don't become so closed up that you begin thinking that you know everything and won't ask for help.

You have posted a very good question in my eyes. The vessel industry is an awesome industry, but it is also one that can be very difficult.

Good luck.

Scott

 

[MJCronin]

gayaz,

Do you currently work for a fabricator of vessels or are you in a position where you are evaluating existing vessels ?

Are you specifying brand new vessels for purchase or what ?

MJC

 

[Norphlet]

gayaz

Vessels, not exceeding 15 psi operating pressure, are not included in the scope of ASME Section VIII, U-1(h).

According to your message, I will assume your tank exceeds 15 psi operating pressure. Otherwise, ASME code may not apply.

If you are inside the USA and your tanks are less than 15 psi then they may comply with several of the following standards and regulations.

American Petroleum Institute Standard 650, 620, 653.
American Water Works Association D100 Standards.
Underwriters Laboratory Standard 142 and 2085.
Steel Tank Institute Standards, F911, F921, and F941.
Clean Water Act.
Clean Air Act.
National Fire Protection Association Code.
Your State Regulations.

Hope you success in your career