×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • 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!
  • Students Click Here

*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.

Students Click Here

Jobs

FE Testing

FE Testing

FE Testing

(OP)
Experts,
can some one advce about the FE testing tools, if we want to carry a test what sort of tools & equipment required?

Jaff

RE: FE Testing

Do you have CAD software? most modern CAD/solid modeling programs, Auto-CAD, UG, solidworks etc.. have FE capabilities or add-ins you can get.

RE: FE Testing

(OP)
reverman.

its a fugutive emission test, i am talking about, can u bried what is the relation between in fugutive emission test and CAD software.

jaff

RE: FE Testing

sorry thought you meant Finite element analysis

RE: FE Testing

what kind of fugitive emission testing are you doing? testing a packing, testing a gasket? or testing packing in a valve?

RE: FE Testing

I thought you were talking about the Fundamentals of Engineering test and wondered why you had posted in "Valves".

As reverman says, there are a number of fugitive emissions tests that can be applied.  Most of them are some variant of a "bag test" where you seal a bag of some sort around the place you are testing and time how long it takes to fill the bag (of known volume) to a specified pressure.  This is easy when you're trying to quantify leakage past a vent valve.  

Quantifying flange/thread leakage, or packing leakage can be a challenge because it can be difficult to get a seal around complex shapes.

David

RE: FE Testing

API 622 provides details on how to build a test fixture to test packing.

As far as testing valves unfortunately there is no one standard. I would try and get a copy of either chevron's fugitive emission testing procedure Or Lion Oil's those two specs are the most harsh I've seen and if you pass those you many companies (not all) will accept it.

API 622 is currently in revision and one of the items on the agenda was to add a method for testing valves. However at the last API meeting this section was removed. They may release as a separate API standard but I have no idea what time frame that would be.

RE: FE Testing

    First of all get a good NDT training course on Leak Testing (LT/MSLT method) according to EN 473 and/or ASNT-TC-1A standards, for example.

    Then check EN 1779 and ISO 15848-1 (Annex A and Annex B) for an overview of the possible techniques, for both general applications and valve (type and production) testing.

    In the end, you should be able to choose a mass spectrometer helium leak detector capable of fulfilling Your needs and the relevant accessories.  

    Finally search this Forum for all the related discussion threads...
smile


Hope this helps,
                'NGL
____________________________
  

RE: FE Testing

(OP)
Thanks to all.

but i was wondering that API-622 was already released or not, i was searching for that standard.

jaff

RE: FE Testing

Jaff,
        searching on http://www.api.org/Publications/, You can find that API 622 standard about TYPE TESTING OF PROCESS VALVE PACKING FOR FUGITIVE EMISSIONS is currently pubblished in Edition 1 dated 2006.

       Please note that "... This standard does not provide acceptance criteria for valve packing, nor is it intended to replace proof testing of valve assemblies or valve production testing...".
       Hence, I believe that the application of such standard is up to Packing Manufacturers in order to qualify their products, and not up to Valve Manufacturers; Valve Manufacturers may specify that as a requirement when they buy packings, but should not be considered accountable and liable for the execution of the relevant tests.      


       See also:

        -    thread408-155734: API 622 about Valve Packing type testing;

        -    thread408-253784: API 622;

        -    thread408-261665: Additional Cost for Fugitive Emission Requirment...



Hope this helps,     'NGL


___________________________________

RE: FE Testing

Anegri's suggestion on a helium sniffer is the most realistic method of testing for applications where you can fill the valve with helium.  If that cannot be done, you will have to resort to bag method or specialized sniffer if the medium in the pipeline is detectable in ppm.

I work at a valve manufacturing facility and we only perform emmision tests for PO's that requires a testing specified by the customer, and normlly only one valve for a whole PO at that.  Otherwise the testing equipment is used primarily to look pretty and to test valve for AML certificate for other end-users.  The packing emmision test is a long and annoying process that involves mechanical and thermal cycling along with a very poor fellow sitting there with a stick... (sniffer)

Frankly, some of the new standards being developed are almost borderline impossible from the viewpoint of valve manufactures requiring below 75 ppm in vaccum throughout the test... while refusing to pay more for it.  

I'm not too sure on the exact situation on the floor in the plants, but I am sure they get valves to pass inspection by tightening the packing gland more and/or getting more expensive packings during maintence.

-Sniper out

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

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!


Resources