Best pipe material for sewage pipeline over sea channel
Best pipe material for sewage pipeline over sea channel
(OP)
I intend to install a 4" sewage pipeline 120' long (approx).
pipe exits from a commode on a dockhouse with a very good slope for gravity drain along a distance of 120' to shore.
there are issues with UV light on PVC, however cast iron, carbon steel etc will be overkill, will require a lot of supports, and too expensive for such a low presure system.
I am very worried about environmental hazards with a potential spill into the channel, trying to select a pipe material smooth enough to allow the solids/suspension to gravity glide to a tank at shore, strong enough to withstand 110 degrees F and a lot of UV. any advice would be appreciated.
thank you
pipe exits from a commode on a dockhouse with a very good slope for gravity drain along a distance of 120' to shore.
there are issues with UV light on PVC, however cast iron, carbon steel etc will be overkill, will require a lot of supports, and too expensive for such a low presure system.
I am very worried about environmental hazards with a potential spill into the channel, trying to select a pipe material smooth enough to allow the solids/suspension to gravity glide to a tank at shore, strong enough to withstand 110 degrees F and a lot of UV. any advice would be appreciated.
thank you





RE: Best pipe material for sewage pipeline over sea channel
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Best pipe material for sewage pipeline over sea channel
RE: Best pipe material for sewage pipeline over sea channel
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Best pipe material for sewage pipeline over sea channel
RE: Best pipe material for sewage pipeline over sea channel
cvg: It sounds like a suspended line under a dock. Burial seems an impractical and expensive alternative. It also may make gravity drain to the local sewage/septic connection impossible (as subsea burying may well end up lower than the local sewage/septic connection)
RE: Best pipe material for sewage pipeline over sea channel
HDPE with carbon black is resistant to UV and the entire thing could be fused, no fittings and C factor of 150. would weight the same or less than PVC and would be tougher. biggest problem with plastic pipe is thermal expansion
http://www.ajdesigner.com/phppipeexpansion/unrestr...
RE: Best pipe material for sewage pipeline over sea channel
RE: Best pipe material for sewage pipeline over sea channel
Good luck,
Latexman
RE: Best pipe material for sewage pipeline over sea channel
Patricia Lougheed
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RE: Best pipe material for sewage pipeline over sea channel
For how long?
Should be, but what if it isn't? The OP has indicated that he feels a high risk associated with a leak. Having to use paint as a barrier to degradation and ensuing leak is not the best option for an 'inherently safer design.'
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Best pipe material for sewage pipeline over sea channel
http://www.layfieldenvironmental.com/pages/EGI/Spe...
RE: Best pipe material for sewage pipeline over sea channel
“The beautiful thing about learning is that no one can take it away from you.”
---B.B. King
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RE: Best pipe material for sewage pipeline over sea channel
All of the plastic systems will require more pipe supports than metallic pipe. Probably a pipe support every 7-8 feet at your operating temperature. Netallic systems only need pipe supports every 20 feet. You also will have problems with thermal expansion with the plastics.
It probably makes more sense to install a pump and use a 2-Inch force main. It will simplify your piping and you will not have to worry about installing the pipe with a slope.
RE: Best pipe material for sewage pipeline over sea channel
RE: Best pipe material for sewage pipeline over sea channel
Have you not heard of pressure sewer systems? Many households are fitted with an individual sump, pump and controls. The pump operates when the system pressure allows. The majority of the piping is DN50 PE. This would be ideal for this application. It overcomes any blockage potential.
http://www.monopumps.com.au/en-au/pressure-sewer-s...
“The beautiful thing about learning is that no one can take it away from you.”
---B.B. King
http://waterhammer.hopout.com.au/
RE: Best pipe material for sewage pipeline over sea channel
RE: Best pipe material for sewage pipeline over sea channel
1) Stanier: the PSS system using PE you suggested is very good but would involve a lot of maintenenace, I intend to avoid using any pumps because i have a very good slope so there are no issues with blockage, flow etc. My proposal will be simple and cheaper as well. I want to make sure that whatever material is used for the pipe will be reliable so I don't get leaks into the sea channel.
2)cvg:that looks very similar to my application but I intended to install the pipe on the outside of the gangway (not as depicted on your attachment).Now you have got me thinking.
RE: Best pipe material for sewage pipeline over sea channel
RE: Best pipe material for sewage pipeline over sea channel
RE: Best pipe material for sewage pipeline over sea channel
RE: Best pipe material for sewage pipeline over sea channel
RE: Best pipe material for sewage pipeline over sea channel
That being said whether or not it is "overkill", a good bit of metallic e.g. ductile iron or steel pipe is used in major docking or wharfing facilities (e.g. see http://ndbm.wbdg.org/system/html/6/2719 and NAVFAC etc.) While I won't pretend to know all reasons for such (I think some have been provided by others), in addition to what has already been mentioned such pipes are also quite resistant to force and impact type damages that can/tend to eventually befall exposed piping, including by flotsam and jetsam or flying objects on, adjacent to or under docks etc. With regard to sunlight and UV exposure on plastics mentioned by others, despite common addition of UV inhibitors (and frankly some industry downplaying of risks), sunlight over a period of time can have a rather drastic effect on particularly the structural impact strength or toughness with regard to impacts or crack propagation at flaws/damages of some plastic pipelines, exacerbating such risks.
RE: Best pipe material for sewage pipeline over sea channel
RE: Best pipe material for sewage pipeline over sea channel
RE: Best pipe material for sewage pipeline over sea channel