What's the Best Piping Material for This Application?

Is this homework?

Of course.

I would go with fiberglass made with vinyl-ester and ecr glass from Fiberex. Most fibreglass pipe makers wind over a mandrel, so I would ask to have the mandrel coated with a novolac coating such as Novocoat SC 3300. It will handle the acid and the temperature without any difficulty.

Contrary to another post, in my opinion FRP is easy to work with provided care is taken in selecting and applying the correct adhesives for jointing. Do not use any adhesive but epoxy for this application. I would use the Novocoat SC 3300 as the adhesive, it has great adhesion to vinyl-ester and as I said before incredible chemical resistance.

Bond-line thickness is crucial, you must be able to apply a void free 0.030" bond-line and maintain it until the cure cycle is complete. Use welding wire to achieve this, the key is to make sure that once you have made the joint up, it must be kept completely still.

Cheers,

Bloefeld

There's lots of options out there and each has its merits. You don't give a lot of details - will this be installed indoors, outdoors (worried about UV? fire/smoke properties? external corrosion that might preclude lined steel?, ...? Will the acid contain organic solvents (even in the ppm range this can change the correct choice)? Are you looking for 5 year life or 30? Do you have specialty contractors around for install and/or maintain?

Fiberglass pipe can be used, but within that there's multiple resins, there's hand lay up construction, filament wound construction, centrifugally cast pipe, ... hand lay up construction if made right can have great chemical resistance, but can also cost more up front.

There's several thermoplastic options that could work - PP and PVDF among them. At this temperature, I would probably be looking at using the thermoplastic as a lining material either encased in contact molded fiberglass or as lined steel.

Also, rubber lined steel is definately an option if it's made right and maintained right.

Sometimes lined steel is used simply by virtue of its ability to span larger distances than plastic pipe. There is no one right answer for every chemical environment or every plant. Think about other details of the design and how these materials might fit in.

I have specified this for several applications with HCL, though not for "process" piping, mostly for laboratory low-volume use and drainage into a limestone-filled vat for neutralization prior to diluting and drainage to the sewer.

http://www.charlottepipe.com/Default.aspx?Page=ChemDrain&type=ChemDrain

as well as the Lab piping system by:

http://www.spears.com/

Both have regional 'reps' that may be able to help you specifically for your application, and are more cost effective, if usable, than alternatives like stainless steel, glass, etc.