Potable Water Pipe Material
Potable Water Pipe Material
(OP)
There seems to be a differing of opinion as to whether pipe material should be galvanized carbon steel or stainless steel.Any ideas please.
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
Potable Water Pipe Material
|
Potable Water Pipe MaterialPotable Water Pipe Material(OP)
There seems to be a differing of opinion as to whether pipe material should be galvanized carbon steel or stainless steel.Any ideas please.
Red Flag SubmittedThank you for helping keep Eng-Tips Forums free from inappropriate posts. Reply To This ThreadPosting in the Eng-Tips forums is a member-only feature.Click Here to join Eng-Tips and talk with other members! |
ResourcesWhat is rapid injection molding? For engineers working with tight product design timelines, rapid injection molding can be a critical tool for prototyping and testing functional models. Download Now
The world has changed considerably since the 1980s, when CAD first started displacing drafting tables. Download Now
Prototyping has always been a critical part of product development. Download Now
As the cloud is increasingly adopted for product development, questions remain as to just how cloud software tools compare to on-premise solutions. Download Now
|
RE: Potable Water Pipe Material
RE: Potable Water Pipe Material
RE: Potable Water Pipe Material
The galvanized steel pipe and the coppper tubing would be commonly used for smaller sizes in residential installations. Some building codes might allow PVC and CPVC (for hot water) in residential installations.
Larger galvanized pipe beyond NPS-2 threaded might not be as available. Grooved coupling systems (Victaulic, Anvil) could be used for larger galvanized piping.
The PVC pipe might not be used for some commercial buildings and industrial plants. Heat tracing could be applied on the PVC if the temperature is limited by thermostats or integral limiter conductor cables. Steam tracing would not be suitable unless special techniques are used on steam tracers to separate tracer for installation.
Large size pipe for potable water could be carbon steel, coated / cement lined steel pipe, cement lined ductile iron pipe for buried service, plain ductile iron pipe, concrete pipe, PVC, or HDPE for long buried installations.
Stainless steel pipe might be used for potable water in food service / medical facility installations where washdowns are required.
RE: Potable Water Pipe Material
RE: Potable Water Pipe Material
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/
RE: Potable Water Pipe Material
RE: Potable Water Pipe Material
The length and diameter along with the pipe trench installation would best be handled in HDPE. The possible external corrosion for pipe in a trench is no problem for HDPE. The HDPE could also be run under road crossings if required. The HDPE material could also withstand freeze without rupture in event of electric power failure to the heat tracing. A continuous flow through the pipe will keep it from freezing solid, unless temperature goes sub-zero. A heat trace system would protect line from plugging during a shutdown - it would be good to have drain provision in event of power failure in winter freeze.
see sites for HDPE pipe, among others:
www.isco-pipe.com
www.kwhpipe.com
www.polypipeinc.com
www.hdpe.com
www.mcelroy.com pipe fusion joining machines & rentals
RE: Potable Water Pipe Material
RE: Potable Water Pipe Material
That statement does not make any sense. Is this trench existing?
Why not bury the line? Most people avoid trenches because of the problems with them. If it is a new trench, the cost of the trench will be prohibitive.
What about fire protection? You probably need a large pipe for that.
RE: Potable Water Pipe Material
RE: Potable Water Pipe Material
But in a trench with other pipes, and being insulated? HDPE is probably not a good application for that application. Plastic piping exposed to the weather is going to expand and contract with the temperature changes and the piping will move around, destroying other things in the trench as well as the insulation.
In a pipe trench with other piping, you probably are going to have to use a restrained pipe system.
In regards to the fire protection question, most facilities install larger pipes to handle the fire flow water requirements. The fire flow is normally much larger than the potable water or process water demands. What is the source of your fire fighting water?
RE: Potable Water Pipe Material
RE: Potable Water Pipe Material
If the water quality as shown from water analysis testing or from previous experience is corrosive and aggressive, or perhaps there is a process issue where the corrosion products are not acceptable, then one would prefer stainless steel or galvanized.
If your pipe trench is in a damp area or floods, or is constantly exposed to water, then galvanized pipe will rust over time, then one would prefer stainless steel.
If the water is not corrosive, and the pipe exterior will be dry, then one would prefer galvanized.
The HDPE pipe that I was referring to in an earlier post was coiled HDPE. Coiled HDPE would not work because it is not restrained.
PVC and HDPE pipe systems will require pipe supports every 3-5 feet, so you would require lots of pipe supports to hold up the piping in your trench. So PVC and HDPE piping systems are probably not good piping options.
You might want to look into the use of FRP pipe, the pipe supports required are about the same distance apart as for steel piping.
Why don't you just have your contractors give you the price for stainless, galvanized, and FRP. Then you can decide.