ANSI FCI 70-2-2006

[justinheckman]

I was asked to review the listed standard to determine if it applies only to new valves or also to worn valves. I have reviewed it and can find no specific statement about this.

Does anyone know the specification for this?

Thanks

 

[gerhardl]

The link

http://www.techstreet.com/cgi-bin/detail?doc_no=fci|70_2_2006;product_id=1261166

advertising for sale of the standards also gives a summary of the content.

I am not familiar with the detailed text of the documents, but for any valve leakage test worldwide you can ask yourself the question: when is it necessary that any specific valve conforms to(do not give more leakage than allowed) when tested after a certain leakage test?

Obviously when the valve is new, ideally all the time. If you have the safety of the installation (and operators) in mind you usually set down a maintenance and check scedule to ensure that the valves do not give (unreasonable) leakages above the selected test level, or alternatively have detection methodes giving alarm or maintenenance or service indication if leakage reaches a certain limit.

One side is the test methode description, the other side is the QA procedures for the plant describing how to locally apply the test as part of the total safety concept for the plant and process.

Use the following thought experiment: the neibour competing plant goes broke and want to sell you very cheap a lot of valves just put into service, but used, and qualified to the leakage test from two weeks to one year ago.

If you need the valves, how would you qualify the valves? And to what test criteria? What does your companys QA say?

And now the key question: how are you sure your own installed valves is better on leakage than the ones you considered buying and wanted to test before installation?

 

[bcd]

ANSI FCI 70-2 does not restrict its scope to just new control valves. It can be applied to new, worn, or refurbished valves and the desired test class and acceptable leak rate are subject to agreement between the purchaser and manufacturer.

 

[JLSeagull]

Most leakage standards apply to leakage testing for new vales. They can be applied to used valves to determine repairs etc.

You may obtain a portion of an older version with some control valve information. Consider searching for "control valve handbook" to find something. I regard the applicable leakage rates for throttling control valves.

Lacking standars handy I am not sure of the numbers. Perhaps API 598 reflects zero leackage including bidirectional for resilient seats; and leakage rates like control vales etc. for metal seats. Perhaps API 607 covers some leakage rate testing for fire safe valve testing. I am sure that a standard includes zero leakage for valves with soft seats and a leakage rate for valves with metal seats. However after piping tests the line or operations begin some valves may be damaged and leak. You can inspect a new valve and fix a used valve.

 

[NGiLuzzu]

I've got the previous edition (2003; see also thread408-76110 within this Forum) and the declared purpose is just to establish leakage classes for control valves and to define the relevant test procedures.
However, it is important to remember that this "cannot be used as a basis for predicting leakage in conditions other than those specified" (para. 2.2).

Hope this helps, 'NGL
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