HDPE to Steel options
HDPE to Steel options
(OP)
What is the preferred connection between 24" HDPE and 20" steel.
What is the availability of a 20x32"od reducing flange? Are the available in both weld neck and slip-on?
If not, I guess I would use a set of 24" flanges and then a 24x20 reducer.
(I realize that I will use a 24" flange adapter on the HDPE side)
what does anyone think?
thanks
Mark
What is the availability of a 20x32"od reducing flange? Are the available in both weld neck and slip-on?
If not, I guess I would use a set of 24" flanges and then a 24x20 reducer.
(I realize that I will use a 24" flange adapter on the HDPE side)
what does anyone think?
thanks
Mark





RE: HDPE to Steel options
In Australia, one method could be that you would lay the PE with a cut end.
Butt weld a PE flanged/spigot onto the cut end of the PE.
The flange of the PE is usually a stub flange with a steel backing ring (have a look at the PIPA web site in Oz, for the details of a stub flange & backing ring).
Use a flanged fitting on the steel pipe to join.
As you said, using a 24 to 20 reducer. I do not know of the diameter differences in your pipes.
Normally, water utilities do not like to use flanges (buried) if they can avoid it. Another method would be to use a Straub coupling (or a Dresser coupling - I don't know what is available in USA). It would depend on the relative diameters of the two pipes. Straub couplings are not usually used with a diameter difference.
RE: HDPE to Steel options
Richard A. Cornelius, P.E.
WWW.amlinereast.com