Material for Pipe Milk Dairy - Milk Transferring to Silo/Packing Machine

UPVC is simply rigid PVC with no plasticizers added.

CPVC is chlorinated PVC and it is more flexible and withstands higher temperatures.

It is commonly used in chemical processes.

I know nothing about its use in dairies, I worked in chemical processing where we used both.

Thank you Mr. lyn for your reply. Let me wwait for a day or to to see other members views.

Thanks,

dhayanandhan.s

I think CPVC is not allowed in contact with potable water or food, due to leaching?

PVDF (Kynar) would be a preferred material in such a case.

I would be very reluctant to use CPVC so close to its maximum usable temperature. At the very least I would question the supplier specifically about the temperature.

CPVC is good up to and including 200°F according to the manufacturer....Any pipe material used in dairy processing must be certified for use....

USDA guidelines

CPVC pipe specs

http://edis.ifas.ufl.edu/pdffiles/fs/fs11900.pdf

You also need to included the more stringent 3A requirements to be USDA 3A approved. also yours specification is 16 years old, may need an updated on.

also it a good rule of thumb, but it may not cross over to other country's governing bodies.

Is you pasteurized a HTST (High Temperature/Short Time)?

keep in mind, the material may be ok for transfer, but not as a holding tube for pastuerization

Challenge your suppliers... have them supply you with the documentations.

And the documentation not only include it can do that, but also documentations the governing santitary approvals for this use.

the pastueurizers I've design, I always used Stainless 304/316. If for anything, it durability as well as sanitary.

the pasteurizer you listed is relatively small one. Also where you are, do you have new equipment inspectors for sanitary equipment?

That would be my concern.

Having worked in the food industry firstly in engineering and then production management the hygiene clean down was rigorous. Corrosive chemicals and high temperatures aren’t going to be conducive for use with many forms of plastic piping.

Regulations in the UK require regular visual hygiene inspections of the inside of dairy pipework, vessels, pumps and valves. To achieve this the pipes must be easy and quick to disassemble and reassemble so it is common to fit Triclover™ joints (lots of manufacturers make these fittings under different names and I quoted this one only so you can find it quickly on the web). All the valves, pumps and tanks can be specified to come pre-fitted with these joints and attaching them to the pipe work just needs a butt weld and the inside surface grinding and polishing smooth to remove any ridges or pin holes where bacteria might lodge. The pipe welds can be done away from site in a clean (clear of possible mild steel contamination) welding shop and this allows for controlled lower cost fabrication. On site the pipes are locked together using a clamping collar with a gasket inserted. Gaskets should be replaced each time the pipe is reassembled. (Gaskets £0.50 each last time a purchased some)

While the same regulations may not be in place yet covering your dairy it is only a matter of time before they will become mandatory. Why not be forward thinking with your design.

"...we have been informed by a supplier..."

It appears that the supplier to whom you refer is looking to make a sale, and might not have been aware of the condition where the temperature required will go up to 90 Deg.C.

While I have been away from sanitary applications for several years now, I do not ever recall seeing anything other than stainless steel used in such piping.

While the initial cost may be higher, overal, you will probably recoup part of any expenditure in the long run.

About 45 years ago, I had to design a replacement tank, and chose to make all parts of 316 SS except for the external saddles and top ring(also external); my boss thought I was crazy, but signed off on the expenditure,

Shortly after, corporate restructuring resulted in my boss and I, among many others, being laid off.

I visited the plant about a year later, and was informed that the tank had been left outside for almost the year, and the only parts that needed replacement were the saddles and top ring!

The lines in the family dairy farm for milk transfer were glass. Was told it was of a clear material so that you could see that it was clean. That no sediment had build up on the inside. Part of the sanitation process was to flush it with really hot water. As that was almost fourty years ago can't remember the temperature of the water. Also all the turns were done with sweep elbows. Which would allow the use of a scrubbing shuttle cock to be circulated if there was sediment build up.

That being said there are clear pvc pipes that are FDA approve for the application. You will need to get temperture specs from manufacture. As those are all different depending on the application.

Just what I want, PVC monomer in my milk! No wonder I am sick!

Glass is better, PVDF is better also, but no clear version I am aware of.

Pyrex is the best, I suppose.

In Wisconsin, the standard for dairy is Stainless Steel of 304 grade or better with food grade welds.

Yes, OK, but how do you tell if the inside of the pipe is not coated with milk stone, or fouling?

SANPC (sanitation process controls) A combination of CIP, Break down and clean, videographing, physical inspection and Swabbing and sampling followed by steam exposure to sterilize. It is a Validated, highly documented, and very rigorous regimen.

OK, and I expect this is also time-tested by many years experience with.

The lines need to be able to taken apart... What's allowable is you have a straight run and a elbow, then you need a clamp connection. That what you can see the full internals... except inside side of elbow.

Otherwise what you can do (if the equipment inspector lets you), you'd need a borescope to check for the condition inside the pipe...

In a plant, normally there are samples taken, and when the bacteria count goes up, then they investigate.

But on a holding tube on a pasteurizer, see picture below, we had always did a full process weld, with back gassing.

We needed to use a borescope to verify the internals,... welds basically.

Sounds like a smaller micro dairy, if you get food grade material, here in the United States, it’ll follow USDA 3A specifications.

you need to get the specification from you region if out of the United States.

And when you order it, make sure you get the material approved paper work for it. It should be a problem.

the temperatures your talking about sounds like it’s coming out of a pasteurizer.

just keep in mind that since you’ll be using that material instead of Stainless, the chemicals you use (Acid and Detergents) for wash down and sanitation will break down the UPVC and CPVC food grade material.