Paint for heater water corrugated stainless steel connections
Comments
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It would be lovely if there were a paint which prevented rust spots and holes. I don't know of one, although there are some which will slow the problem down some (some of the Rustoleum products, for instance — not sure how they would work on polished stainless steel, though). A better bet is to keep the stainless clean. VERU clean.
Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England0 -
The rust is probably due to the chlorides in the air around pool area, If this was csst gas pipe the manufacturers would recommend wrapping it in silicone tape.
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Hi, There is a good chance the old connectors were type 304 stainless. Look at using type 316. They should hold up better.
Yours, Larry
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Is that a field-made CSST connection, or a manufactured appliance connector? (The connections on the end will tell you what it is.)
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This is corrugated stainless steel connections sold in Home Depot. Already made, not field made. Label show A Reliance Worldwide Corporation Brand. Typical pool hot water from heater is around 80 to 82 degrees F. Yes, pool water likely contain chlorides.
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So? They'll rust. Keep chlorine and chlorides and chlorinated water as far away from them as you can.
Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England0 -
The old 1" FIP x 1" FIP 24" SS Flex
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They literally carry the pool water Jamie, I don't think you can keep it away from them internally.
That said, I've had quite a bit of 304ss hardware around my pool from gauges to hose clamps and none of it is rusting.
Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
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For exterior rust on the hoses,
Wipe them regularly with motor oil. Motor oils usually contain corrosion inhibitors as part of their additive package. I've read that marine motor oils have extra corrosion inhibitors for "The Demanding Marine Environment" Fact or marketing fluff?
ZDDP (Zinc dithiophosphate) is a good corrosion inhibitor. Lots of ZDDP in STP oil treatment. STP has lots of marketing fluff. STP stands for Scientifically Treated Petroleum.
Because Science!
If you are in California, use organic coconut oil.
Buy 10 identical hoses, 10 different oils, and make a YouTube video. You can throw a pool party with the proceeds. I'll bring the Nitrate Free* Hot Dogs.
*this product includes naturally occurring nitrates from sea salt and celery powder.
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Maybe some PVC or silicone rubber hose would be better. Any online hose shop can build them to your length.
A hose would have a lot less pressure drop also.
Or spray a clear lacquer or enamel on the stainless?
Falcon Stainless has PVC coated stainless connectors, Big Red is their commercial coated gas connector, that may work.
Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream0 -
PVC and even flexible PVC are commonly used on pools.
Polyethylene used to be but for some reason seems like it died off.
Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
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But this is connections from the water heater to the pool. Typically temperature at least from 82F to 100F. Would this high hot water cause damages to PVC material? We also notice brass fitting here also have extensive corrosion.
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Sch 40 PVC is rated for 72.6 PSI @ 140F.
I think Rod was right.
Use all PVC including PVC male adapters where necessary. No brass.
Although like I said in my own pool I've had no issues with 304 at all.
But I'm very picky with my water.
Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
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PVC seems to get brittle after years of pool use. Maybe it is related to how well the pool chemistry is balanced?
I will say the flexible PVC seemed to be softer, less prone to cracking. It is commonly used to connect filters and pumps, I suspect it is rated for pool and hot tub pressures and temperatures.
I bought some silicone rubber hose to use on pump carts, rated to 180f, crazy expensive, they price it by the inch!
You see radiator hose on hot rods is sometimes that blue colored silicone hose. It is very flexible also. Probably overkill for pool use. I wonder that standard EPDM heater hose would be adequate. EPDM is used as seals and o rings in many plumbing products
Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream0 -
I would assume it's from the sunlight.
PVC doesn't like sunlight and I think the flexible stuff may be even worse. I don't recall hearing any issues with buried PVC for pools.
Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
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Correct, PVC is not supposed to be exposed to the sun/UV rays. It degrades the outside, but in many applications it's more a cosmetic issue than an actual functional issue.
The company I work for actually paints all ours prior to shipping as the units are just about always installed outdoors, a layer of paint offers enough protection to stop the degradation from the sun.
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Wow, that mean we should use PVC for this entire pool water heating system? Too late. We have all stainless steel and / or brass connections. All other cold water connections and filter systems are PVC. May be next pool?
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The flexible PVC stuff seems to last the longest.
My pool pump, filter and heater were in a concrete block building and it became brittle. It would shatter if you tried to cut it. It was 20 years old when we bought the home, however.
Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream
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agree with Larry, tubing made from 316 grade stainless will hold up much better in salt/clorine. Used extensively in for coastal areas.
Moot point if you go with PVC or another plastic type tubing.1 -
Will PVC plastic pipes in 100F hot water hold up to 30 psi pressure?
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As I said a few days ago, Sch 40 PVC is rated for 72.6 PSI @ 140F.
That's it's actual rating, not where it will fail.
According to this chart at 100F you're looking at 204 psi. This is all assuming 1.5" which is typical for pool equipment.
You can also find similar if not identical info in this pdf :
Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
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Thank you very much for your response.
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