Go to WwW.performancepipe.com for helpful design information on HDPE pipe. We were formerly Driscopipe and Plexco. The site is a little confusing right now but try back later if it is too difficult to navigate.
I agree with all statements here, I would recommend that who ever does the...
Also try JCM, Romac and Smith Blair. All make mechanical fittings for use on HDPE.
Depending on the circumstances you may need to install a thrust anchor on the HDPE to prevent it from pulling out of your connection. I imagine you will probably find a repair sleeve will work well - but it is...
HDPE that is produced with 2% carbon black will provide an almost unlimited outdoor storage life. HDPE pipe that is not black will have a limited service life in the sun. HDPE is inherintly better than pvc against uv degredation.
The real design issue, as stated by smckennz, is how hot the...
go to www.performancepipe.com formerly driscopipe and plexco.
Cold field bend radius of HDPE is function of DR and OD. MINIMUM Bend radius for common drs are as follows:
DR9 or thicker = 20 times od
DR 9 to DR13.5 = 25 times od
DR 13.5 to DR 21 = 27 times od
greater than DR 21 = 100 times...
1PE,
Check out our website, www.performancepipe.com. Request an engineering CD. There are some calculations for unconstrained buckling on the CD plus many more design calcs. If you have questions call me.
Kevin Deal
Performance Pipe
936-321-8940
mrf,
Some good comments from others here regarding HDPE. I work for a polyethylene pipe manufacturer. [thumbsup2]
I have not seen the studies myself but have been told many times that HDPE can outperform steel in terms of abrasion resistance. If needed I can try and find that data. Of...
cuzisthe1,
Wow, interesting repair. If a repair is being made under water, the only real option is mechanical fitting. Depending on the DR you may need a stiffner inside the HDPE pipe. This will prevent the pipe from toe-ing in and allow for restraint.
Again, make sure that the fitting is...
cuzisthe1,
If you are located in the US. Check out our website at : www.performancepipe.com
We used to be Driscopipe and Plexco, now we are Performance Pipe a division of Chevron Phillips. You can find a listing of our distributors by state here...
If you use HDPE pipe inside the casing or for the casing itself, you will not need to restrain any joints at all. (Except for the PVC to HDPE connections, of course) Installation may be easier with HDPE as well.
check out www.driscoplex.com, good luck.
Gungadin,
I happen to work for an HDPE pipe manufacturer and am familiar with those types of projects. Check out our website for literature and technical information www.performancepipe.com . For cost estimates on the pipe you can get them from one of our distributors who are listed on the...
Stanier and Pumpdesigner,
There is a fusion equipment manufacuterer that makes a product called the DataLogger. This allows the user to record the critical parameters during each Polyethylene pipe fusion. Have heard from many that this is a great tool. Here's the link ...
Thank you for your comments Stanier, very informative. Just FYI, Driscopipe and Plexco have combined to form Performance Pipe, a division of Chevron Phillips Chemical. The new website is www.performancepipe.com
A lot of helpful engineering information can be found on this site about HDPE pipe...
This message is a little late but an excellent resource for chemical resistance data on plastic piping can be found at the PPI (Plastic Pipe Institute) website : www.plasticpipe.org.
You can find the technical report, TR-19 Thermoplastic Piping for the Transport of Chemicals here...
Found a listing of Shear Strength here for HDPE : http://www.interstateplastics.com/products/spec/hdpe.htm.
The Shear strength number is a short term property. As you know, these properties are time, temperature and load dependent. You may want to apply a conservative approach to avoid a...
When choosing the Pressure Class of pipe consider working pressure. C900 has a surge allowance of 2 fps built in. If you expect recurring surges above that velocity you should de-rate the pressure rating respectively.
If the surges are not recurring and are only occasional take a look at...
Pumpdesigner,
I happen to be in the Polyethylene pipe business (Manufacturer) and your comments are refreshing to hear. The response that you mention regarding re-training is a common one. The cost of re-training however, is insignificant to the savings that could be realized by switching to...
The pressure transient that results from a water hammer event is directly related to the stiffness of the pipe material.
The shockwave speed (S) that results is determined by the stiffness of the pipe material.
S (ft/s) = sqrt(((144*E)*EB)/((w/g)*(144*E+(EB*D/t)))
The pressure surge is...
Sorry for the late reply, new member here. A few more comments regarding connecting HDPE to DI (or PVC, etc).
Joint restraints, in-line anchors, or a combination of both may be required when non-PE pipe and components are connected to a piping system that does not have restrained joints...
