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.

Riversidean (Civil/Environmental) (OP)
21 Jun 12 14:39
Hello,

This may be a very simple question, but I am looking at creating an alignment for an 8" HDPE SDR 17 pipeline. I am trying to keep to the angles used by pipe fittings, but in some cases I get a 40 degree angle rather 45 degree angle. Is there anywhere I can for formulas for pipe bending after a fitting? Should I should assume the minimum turning radius (I have that formula) for a pipe the pipe after the fitting?

P.S. I have plenty of room for the pipe to turn...

Thanks...
racookpe1978 (Nuclear)
22 Jun 12 3:34
Get a 45 degree elbow.

Get a bandsaw large enough to pass the 8 inch dia pipe.

Cut 5 degrees off.

Reprep the joint.
racookpe1978 (Nuclear)
22 Jun 12 5:17
To correct/audit myself: If you are trying to "force" a 40 degree bend through a 45 fitting with a solvent-welded type joint, you will likely fail.

If you can't adjust your start or end points to accommodate a real 45 degree elbow, try inserting a 90 elbow, with the outlet aimed "vertically" up from your x,y plane.

Add a stub lenght of vertical pipe, then another 90. But this puts the second 90 directly above your starting point, except the second 90 CAN be rolled to the 40 degree you want. (Or any other angle actually)

Run the straight pipe from that elbow, now "lifted" in z by the 2x 90 elbows to the desired end point at the 40 degree angle you demand, then add two more 90 elbows.

The first to aim "down" and the second to resume the direction you want.

OK, you've solved one problem, but you have increased fabrication time, material cost, and the flow resistance
austsa (Mechanical)
22 Jun 12 6:37
8" HDPE SDR17 pipe should be able to flex 5 deg very easily .... especially considering that you have plenty of room.
dicksewerrat (Civil/Environmental)
23 Jun 12 20:51
Why don't you order a 40 degree bend in your 8 inch and whatever SDR and electrofuse it?

Richard A. Cornelius, P.E.
WWW.amlinereast.com

BigInch (Petroleum)
24 Jun 12 1:20
Check the minimum radius, then use the maximum you can fit into the space available ... or less, as you may decide to leave space for future installations.

If it ain't broke, don't fix it. If it's not safe ... make it that way.

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