Smart questions
Smart answers
Smart people
Join Eng-Tips Forums
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Member Login




Remember Me
Forgot Password?
Join Us!

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips now!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

Join Eng-Tips
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.
Jobs from Indeed

Link To This Forum!

Partner Button
Add Stickiness To Your Site By Linking To This Professionally Managed Technical Forum.
Just copy and paste the
code below into your site.

tothepoint (Mechanical) (OP)
12 Jul 03 6:56
Can someone familiar with both Div 1 and Div 2 design rules please give me a short explanation of the intent/use of each of these?  i.e., when to use Div 1 rules and when to use Div 2 rules?  I'm not a pressure vessel designer, but work with vessels, and I hear refences to each of these and want to be more informed.  Thanks.
Helpful Member!(2)  prex (Structural)
12 Jul 03 10:48
If you make an advanced search on this site by using Div.2 as the keyword you'll get a lot of stuff to read on the subject.
In short: Div.1 provides simple design rules at the expense of a heavier vessel, Div.2 requires more detailed calculations, making the design cost more but allowing higher stresses, so that, for complex or large vessels, the overall cost will be lower. Both, as any standard, try to keep low the industrial costs for different classes of vessels, still maintaining an acceptable level of safety.

prex

http://www.xcalcs.com
Online tools for structural design

Davis224 (Mechanical)
15 Jul 03 23:55
prex's interpretation is correct. Also, be advised that Sec. VIII Div.1 is intended for pressures below 3000 psi; beyond that ' deviations from and additions to the rules apply' meaning compliance with Div. 2 is required.
sgasociate (Mechanical)
16 Jul 03 13:21
I think one of the most significant differences between Div 1 and Div 2 is Div 2 is used for cyrogenic vessels.
SPLIT (Mechanical)
17 Jul 03 16:26


Div 2 considers the calculations under fatigue conditions.Div 1 does not
Helpful Member!  jte (Mechanical)
17 Jul 03 20:28
Guys-

Division 1 may be used for cryogenic vessels.

Division 1 considers fatigue. See the previous threads where this was discussed in detail.

jt
Helpful Member!  ReMan (Mechanical)
4 Aug 03 8:43
Regarding the comment made on use of VIII-2 for cryogenic vessels, please note that the toughness rules in VIII-1 & VIII-2 are identical. Further, VIII-1 contains rules in Part ULT which are specifically written for vessels in cryogenic service.

RE: Fatigue Design - This is a great misconception regarding VIII-1 & VIII-2. Paragraph UG-22 in VIII-1 lists all loads that must be considered in design, including cyclic service. Just because VIII-1 does not does not provide mandatory rules for fatigue design does not mean that this loading condition can be ignored. Where mandatory rules do not exist, then U-2(g) applies.
aclark (Mechanical)
6 Aug 03 8:42
I think all of you are missing the most basic difference. The basic difference between section VIII Div 1 and Div 2, Div 3 is that Div 1 is a Code with design rules that are based on experience and Div 2 and 3 are based on design by
analysis.

In other words whe the Code was written it was well known that if you made a weld of a certian size it would give you satisfactory results. Also when Section VIII was origonaly written it had a safety factor of 5 it was lowered to 4 in the 1950's or 60's and was changed a few years ago to 3.5 and was given the term Design Margin.
Helpful Member!  Hookem (Mechanical)
8 Aug 03 14:22
Div. 2 are made for specific purpose, for specific location, and the vessel cannot be put into different service nor in different location without going through a recertification process.

I have spreadsheet for ASME Sect. VIII, both Div. 1 and Div. 2 Calculations.  Perhaps I can share.......
MarcoE (Mechanical)
8 Aug 03 16:30
also, div 2 is for vessels 3,000 psi to 10,000 psi.  
div 3 is for 10,000 psi and greater.
jte (Mechanical)
8 Aug 03 17:16
MarcoE-

Division 2 is by no means limited to vessels over 3000 psi. There are many, many vessels built to Div. 2 which have "ordinary" design pressures. I was heavily involved with one a few years ago which had a design pressure of 200 psi at 300°F. Just take a look a AG-100(a): "... The rules of this Division, taken as a whole, provide an alternative to the minimum construction requirements for the design, fabrication, inspection, and certification of pressure vessels falling within the scope of Division 1." It is an *alternative* to every vessel within the scope of Div. 1. Design pressure does not play a role in its applicability.

jt
LSThill (Mechanical)
9 Aug 03 6:27
China
  
Product Regulations Design Code Acceptable Foreign Design Codes
Stationary pressure vessels Order No. 4, 5, 6, 7, 8, 9, 11, 19, 20 Provisions for the P.R.C on the Supervision and Control of Import and Export Boilers and Pressure Vessels (Reg 8)

The Implementation Regulations of Import Beoiler and Pressure Vessel Safety Quality Licensing System.

Order 23, 25 and 26 GB 150-89 Steel Pressure Vessels.

GB 151-89 Heat Exchangers

GB 12337-90 Spherical Steel Tanks None yet accepted.
Foreign codes like ASME, BS and German etc are only accepted if approved in the agreement or contract
Trans- portable pressure equipment Ordern No. 1, 3, 21 and 27) GB 5099-85 Seamless steel gas cylinders

GB 5100-85 Welded Steel gas cylinders

GB 5842-86 LPG cylinders None yet accepted.
Foreign codes like ASME, BS and German etc are only accepted if approved in the agreement or contract
Boilers Order No. 4, 5, 6, 7, 8, 9, 11, 19, 20 Provisions for the P.R.C on the Supervision and Control of Import and Export Boilers and Pressure Vessels (Reg 8)

The Implementation Regulations of Import Beoiler and Pressure Vessel Safety Quality Licensing System. Strenght calculations standards for stationary shell boiler pressure parts or components.

GB 9222-88 Strength calculation standards for stationary watertube boiler pressure parts or components

GB 10180-88 Test Code for Industrial Boilers None yet accepted.
Foreign codes like ASME, BS and German etc are only accepted if approved in the agreement or contract
 

Dear Mr. Thill,

I am sorry it took so long to get back to you, but our
supplier for international standards had a rough time
finding anything.
 
They were not able to find English translations of Codes,
they did find these in Chinese:
 
GB 6539    $ 129.00
JB  4708    $ 153.00
JB 4732     $ 276.00
GB 150      $ 207.00
JB 4744     $ 102.00
 
These are not stock items at our suppliers, so I am sure it
would be at least 4-5 weeks before we could have them in
Houston.
 
If you are interested, perhaps we could find out more info.

Regards,
Beverly Mathews
 
Brown Technical Book Shop        toll free 800-423-1825
1517 San Jacinto                 voice phone 713-652-1917
Houston Texas 77002 USA          fax  713-652-1930
 
Check out our Shopping Cart..."Click and Go" !!
www.brownbookshop.com

Tankman650 (Structural)
10 Aug 03 0:41
Calculations for Div 2 vessel must be certified by Registered Professional Engineer.  

Div 1 does not have this requirement.
juancito (Mechanical)
10 Aug 03 17:34
Another difference between both divisions is the failure theory.
Div. 1 uses max principal stress menwhile div.2 uses max shear stress (Tresca).

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close