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!

*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

Stndard length tolerances for plastic profiles

Stndard length tolerances for plastic profiles

(OP)
If I have 5000mm long PEX pipe, should I put +-30 mm tolerance or not? What are standards for tolerances for plastic and other materials?

_____________________________
Enjoy your work and have fun!

RE: Stndard length tolerances for plastic profiles

Do you need it to be +/- 30mm ?

RE: Stndard length tolerances for plastic profiles

You need to determine what tolerance you can live with on the length. What is your default tolerance for a 500mm long part in your drawing titleblock. It may either be an ISO table tolerance or a specified tolerance based on decimal places.
For the extruded shape, the tolerance should be specified by the manufacturer or some industry spec.

"Wildfires are dangerous, hard to control, and economically catastrophic."

Ben Loosli

RE: Stndard length tolerances for plastic profiles

(OP)
JNieman, on 5m plastic pipe I can "survive" with +-30mm, bu question is what is ISO standard tolerance for plastic, as if it is less then +-30mm then I do not want it on drawing. if it is more then I want it, same like general length tolerances ISO_2768-1, just for plastics (if there is one for plastics)

looslib, it is not question of particular number, more like how to evade putting tolerances on all lengths by placing ISO standard in title block. I would like to know what ISO I can use for plastic as 2768 is too tight, we do not need to increase cost by requesting supplier to deliver plastic pipes with lengths tolerances by ISO 2768.

So is there any ISO that I can refer to, or just to make table with acceptable tolerances for pipe and place it next to title block?

_____________________________
Enjoy your work and have fun!

RE: Stndard length tolerances for plastic profiles

There is no ISO general tolerances standard for plastic (yet).

There are local standards adopted by different countries. To the best of my knowledge, none of them go as far as 5000 mm nominal dimension range.

"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future

RE: Stndard length tolerances for plastic profiles

I don't see anything in ISO 2768-1 that makes it material specific.
Using 2768-v for the tolerance class, the tolerance table only goes to 4m which is +/-8mm, so a 5m length would require you to apply your own tolerance.

"Wildfires are dangerous, hard to control, and economically catastrophic."

Ben Loosli

RE: Stndard length tolerances for plastic profiles

Try ISO 3126:2005
Plastics piping systems — Plastics components — Determination of dimensions

RE: Stndard length tolerances for plastic profiles

Quote (looslib)

I don't see anything in ISO 2768-1 that makes it material specific.

Take closer look:

From ISO 2768-1, Paragraph 1 Scope:

"It applies to dimensions of parts that are produced by metal removal or parts that are formed from sheet metal"

"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future

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


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