×
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

Storage Life of Vent Valves

Storage Life of Vent Valves

Storage Life of Vent Valves

(OP)
Hi colleagues,

We have some venting valves (Drukon GmbH) used in flexible pipes for oil production which uses PTFE and NBR in the sealing system (O-rings, x-rings, back-up rings and filter retainer). Our internal valve specification requests a service life of 20 years, but doesn't specify storage life.

I'm in doubt if I need to control the storage life of these materials separately or consider the complete valve assembly and specify a storage life for the complete assembly.
Which standard(s) should I be based for this consideration?

The supplier certificate doesn't specify anything about it, neither sealing system nor valve assembly.

Thanks in advance for your help!

Brgds,
Rafael Camara

RE: Storage Life of Vent Valves

Hi Rafael,

It is really up to your judgement.
Assuming your storage facility is at ambient temperature by general definition (15-30 degC) and dust free, then standard plastic/pallet/boxes and general proper concept storage e.g. some parts not borne others weight, etc. should be sufficient.
Usually valve assembly storage is the one that is ready to use / plug and play once required for maintenance and shut-down. And spare parts of which stored on separated room usually used for common replacement e.g. gland packing and O-Ring after valves being used for xx hours replacement strategy.

For special attention:
- very clean application, then usually valve assembly is equipped with end cap to prevent potential dust entering the bore.
- Oxygen, Ethylene Oxide, Hydroflouric Acid, etc. shall be hermetically sealed for both valve assembly and its spare parts.

How old before thrown away?? Again it is up to you.
Two things that are usually considered by company and part of warehouse 'disposal' protocol:
- Depreciation (economic) value of the valves and spare parts. After reaching certain years, some parts become sum zero value. Thus have no economical advantage to be kept, and only eat spaces.
- Aging of material. It is like car tyre, even though not used the rule of thumb is after 5 to 7 years shall not be used/thrown away.
Some soft parts did aging test in a lab, but in order to find this (lifetime) out you have to trace back down to the manufacturer of those material or parts, and ask.

Combining both consideration, for bulk material, my company usually throw away valves and materials that have reach 10 years unused lifetime.
Some approach that we use now is keep it as non-stock. Meaning supplier keep the stock on behalf of us, so whenever required or there is 'newer' development yet similar design in the future, then we can have the right parts asap.

Regards,
MR

https://nosuchvalve.com
All valves will last for years, except the ones that were poorly manufactured; are still wrongly operated and or were wrongly selected

http://www.eng-tips.com/faqs.cfm?&rat1=2&f...

RE: Storage Life of Vent Valves

(OP)
Hi Danlap,

Thank you very much! I'll ask the supplier about the ageing results and recommendation about this issue.

brgds,
Rafael Camara

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! Already a Member? Login


Resources

Research Report - How Engineers are Using Remote Access
Remote access enables engineers to work from anywhere provided they have an internet connection. We surveyed our audience of engineers, designers and product managers to learn how they use remote access within their organizations. We wanted to know which industries have adopted remote access, which software they are using, and what features matter most. Download Now
eBook - Managing the Context of Product Complexity Using the Digital Twin
Keeping track of changes to complex products is difficult—think Aerospace & Defense equipment, new generations of commercial aircraft, and software-based automobiles. A new way to managing the digital context of the physical product is required and the answer is the Digital Twin. This ebook explores the opportunity available for Operations and Maintenance for the Digital Twin. Download Now
White Paper - Trends in Industrial Filtration
Substantial progress has been made in filtration technologies in recent years. New filter media materials, designs and processes have led to filters that are more efficient, reliable, compact and longer lasting. This white paper will discuss the various trends that are impacting operational responsibilities of MROs today and the resources that are available for staying up-to-date on the latest filtration solutions. Download Now

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