Recently I encounter a problem with a UPVC 14 in line the engineers think of replacing the line with a HDPE, please share your good or bad experience of these systems.
HDPE can have more variability in yield strength than PVC in general. You'll want to verify with manufacturer particularly for your higher pressure application to ensure you have sufficient wall thickness for the HDPE. Joining HDPE pipe is a little bit more challenging than PVC (this is probably the biggest advantage for PVC in many piping applications). The cost, if you get a good grade of HDPE (so there is less required wall thickness in the pipe) is typically comparable to PVC (depends on your location). HDPE tends to be more stable at higher temperatures and is typically a bit more UV resistant than PVC over extended time under sun exposure if your pipe is exposed. HDPE is less rigid than PVC for a given wall thickness of pipe, but if operating pressurized fluid or running piping underground, this is probably irrelevant for you. If you have engineers/technicians properly designing for your operating pressure and installing the piping, I think HDPE would likely be a fine replacement (ideally you should compare costs for both options before you make your final decision). To the extent you care, HDPE is typically considered more environmentally friendly than PVC.
Thank you Mugas
what about the Publicationinstallation cost other than welding. Do i have to rest the pipe on the similar way of bedding thickness.
For underground piping, I believe you will find that you have a similar bedding thickness requirement regardless of the pipe material type, but I would verify this with your engineers. We thermal weld the HDPE or use essentially hot melted HDPE through a hot glue gun to bond HDPE joints. Again, given where you are located and depending on how much pipe run you are installing, I'm not sure how the installed HDPE cost with bonding HDPE joints will trade out relative to PVC cement (basically a chemical that softens the PVC so it self-bonds without a need for heat) joint bonding. PVC joint bonding has been an industrially available solution for a longer period of time. HDPE is becoming a more popular option where I am located so the HDPE joint bonding issue is not necessarily the same issue it used to be. If you elect to go HDPE, I would evaluate the HDPE bonding costs where you are located and also make sure these HDPE bonded joints won't have any issue with your design pressures.
Thank you again.
in my site HDPE is becoming popular. Last week I surveyed the older PCV pipe lines in the capital Khartoum, I found that most of them have leakage problems that appears every now and then. After examining the pipes, I referred the reason to the workmanship of laying the line. In conclusion the HDPE welding is much safer.
During fire, PVC-U (UPVC) discharge hydrogen chloride, a colourless and corrosive gas. In contact with water, it creates hydrochloric acid, a corrosive which presents serious hazards to human eyes, respiratory system, and internal organs.
When inhaled, hydrogen chloride causes spasms and suffocation.
The bearing structures of the building are also affected – if corrosion reaches the reinforcement of the concrete, the structures loose their strength.
PVC smoke causes corrosion in the microchips of the electrical system, resulting in permanent damage to some data and telecommunication control centres.
The smoke of burning PVC is very thick and considerably reduces visibility. Thereby, finding escape routes is difficult.
Farhad Yazdi
dear Farhad. We are talking about pipes plenty of water at high pressure not cables. HCl is not so corrosive to reach basement affecting the integrity of the structure. Usually high temperatures of fires do that.
Mahmoud H Onsa
I can give the point if view of many engineering and water utility companies based in Italy. The failure cases are much more for PE than PVC pipes. But the quality of PVC pipes, their seals and how they are installed make the difference.
Thank you Farhad Yazdi,
Now I am planing to design an irrigation pipeline, so HDPE is environmentally safer and cheaper, but I have to fine an expert pipe welder.
Thank you all.
Mahmoud H Onsa Dear Mr. Onsa, look at this: https://pvc4pipes.com/media/documents/pvc-u-pipe-competitiveness-total-cost-of-ownership/
regards
Gianluca
- Badges
- Science topic
- Similar topics
- Mathematical Sciences
- Control Theory
- Control Systems