I'm curious why they paint all the white 2-inch PVC pool pump area pipes
On Friday, I put a new pool pump motor in but forgot to open all the Jandy
valves so the pipes overheated, expanded, and blew up in places (a 1.5 HP
motor is strong!).
Anyway, my 2 inch outside diameter PVC pipe from Home Depot earlier today
now stands off as bright white while the rest of the pipes re painted flat
No big deal but I was wondering WHY they paint the PVC pool pipes black and
if it's a good enough reason for me to follow suit on my 2-foot section of
The three reasons I can think of don't seem to hold water:
- heat retention? (c'mon ... how much heat will black retain over white on
a few pipes that are in the open sun?)
- sunlight damage? (maybe ... but then why don't they just sell pool pipes
that have paint on them already)
- asthetics? (c'mon ... can black matter versus white)
Any other reason for the flat black pool pipe paint?
On Apr 18, 11:03 pm, Brent <beemdoub...@Use-Author-Supplied-
Paint is for UV protection of the white PVC (not sunlight resistant).
btw, pre-painted PVC would be a PITA to solvent weld
Could you clarify this sentence?
valves so the pipes overheated, expanded, and blew up in places (a 1.5
motor is strong!). " <<<<<<<<
What caused what to overheat? Did the system have water in it?
The horsepower of the pump is pretty much meaningless with respect to
"blowing up" pipes.
It's the amount of head (pressure) generated that stresses the piping.
A 1.5 hp pump / motor can either deliver high flow / low head or low
flow / high head or something in between; depends on the pump
design / curve.
Most pool pumps would be hard pressed to get anywhere near the
allowable maximum pressure for PVC piping.
That's exactly what happened!
The pump ran but couldn't push any water past the shutoff (the jandy
shutoff leaked profusely but not enough).
Then the threads must have softened and the pipes heated up because a
post-mortem analysis showed the threaded pipes melted in a V shape (hard to
explain) such that they just blew right out of the motor.
When I tried to connect 2" OD PVC to the cut edge of the pipe run, I found
that the 2 inches had swelled greatly (almost a sixteenth of an inch or so
... way more than can be sanded).
So I just cut off MORE pipe (no big deal); but I was wondering about the
On Sun, 18 Apr 2010 23:24:49 -0700 (PDT), DD_BobK wrote:
To clarify, I'm not really sure if the 220 Volt 1.5 HP motor horsepower
mattered but what I saw was a two-inch wide stream of water shooting
straight up in the air about fifteen feet!
It was like a rocket ship was taking off when the pipes heated up so much
that the threads gave way on the fitting comeing up vertically from the
motor impeller on the pressure side of the pump. Kaboom!
Afterward, when I cut the pipe and put new parts in, for a good foot or so,
the 2 inch OD white PVC pipe was way larger than 2 inches on the outside
such that no fitting would fit.
I was very confused because otherwise the very thick (shedule 40 at least!)
PVC pipe didn't seem to be any standard. Finally I realized the heat
expanded the pipe so much that it was no longer 2 inches in outside
I simply cut away all the bad pipe but had to go into my spares box and
accidentally pulled out a black ABS fitting and glued that in.
Unfortunately, I now know that the black ABS pipe isn't pressure rated so
it's going to be a weak link (where were you when I needed you ... :-)
I'm not really sure WHY a pump that has plenty of water with nowhere to go
heats things up ...
Maybe the water bashing back and forth at high speed, going around in
circle after circle after circle after circle heats it up because even the
basket on the inboard side of the pool pump was melted and had to be
SOMETHING about the water having nowhere to go made it get hot as hell
there until the system blew up!
Either you just invented a new way to heat water, or the FBI will come
to your place to investigate the bomb you made and you'll be listed as
You should get help for your drinking problem...... I mean, how did
you turn on the motor and not open the valves? It might be your
They painted them black because they did not paint them red, orange,
green, yellow, blue, brown or purple. However, the person that said
it's for UV protection, and I'd repaint them any color you like. At
the same time, flat black will absorb more sunlight and make the water
warmer. In your case, thats the last thing you need to do.
If that's a 2inch OD, then it's 1 1/2" pvc. Pipe is always measured
by the ID size, with the exception of some of the soft copper tubing,
which is one of the most confusing things a plummmmmahhhhhh has to
The black ABS fitting may not hold up, I'd replace it.
I wonder why they don't just sell black PVC 2" OD pipe then???
Even at Leslies' Pool Supply, they're white.
Everyone seems to just paint them.
It's cheap and easy; but I was just wondering why we don't just start out
with UV-resistant PVC pipe???
I wondered about this myself. Is the OP sure the original pipes
weren't ABS? That is what they use for solar panel connections. On the
other hand I have never seen a pool with painted PVC pipe unless it
was painted when they painted the house. That is in Florida where we
actually have some sun.
On Mon, 19 Apr 2010 16:59:17 -0400, firstname.lastname@example.org wrote:
We have LOTS of sun here. All day sun.
I'm not sure if it's ABS or PVC for all the pipes, but the pipes I bought
at Home Deport say they are PVC.
What made me wonder about the black versus white was I needed a fitting and
I grabbed one that was black through and through. I mixed it in with the
white fittings and then painted the white ones.
I wonder (based on the ABS question) if that one black fitting was ABS
while the rest (the white ones) are PVC?
That makes me wonder: What's the difference from a practical standpoint for
outdoor 12-hours-a-day-in-the-sun 2-inch OD pool water pipes between black
ABS and white-painted-black PVC pipe?
Note: Leslies pool supply sold only the white PVC so maybe I should have
asked the teenager behind the counter but I didn't think of it when I was
I live in South Florida where water doesn't freeze. There are folks
around here with well pipes, water softeners pressure tanks etc, that
have been in the sun for 30 years without breaking so I do think the
UV thing may be overstated a bit.
Sure if you back over one with your car it will break but it isn't
just going to spontaneously shatter.
On Mon, 19 Apr 2010 21:18:37 -0400, email@example.com wrote:
Given that, ALL the pipes I cut were white on the inside (with purple glue
at the seams).
A single 4-inch-long sleev-like fitting I grabbed out of the miriad of
various elbow-like fittings I bought at the hardware store was black all
the way through as I had to cut it to fit.
So, given that black is ABS and white is PVC, my pool plumbing is currently
99% (white) PVC with that single fitting of (black) ABS that I used without
knowing the difference.
Now that I realize I've mixed ABS with PVC ... I wonder ... does it matter
that I have ABS accidentally mixed in with mostly PVC (painted black)?
On Tue, 20 Apr 2010 00:00:31 +0000 (UTC), Brent wrote:
"The Effects of Ultraviolet Radiation on PVC Pipe"
Summarized by the PVC Pipe Association here:
Further summarized by yours truly below:
Q: What effect does ultraviolet exposure have on PVC pipe?
A: Not much but enough to warrant a thin coat of opaque paint!
Modulus of Elasticity = unchanged after two years of sun
Tensile Strength = unchanged after two years of sun
Impact Strength = reduced drastically (by 75%) after two years of sun
Structural Integrity = unchanged after two years of sun
Pressure Capacity unchanged after two years of sun
The loss of impact strength stopped deteriorating as soon as the pipes were
protected by the sun so it's directly related to the UV radiation.
Luckily, the presence of an opaque surface between the sun and the pipe
prevents UV degradation, since UV radiation will not penetrate thin shields
such as paint coatings or wrappings or burial.
Why black? What's more opaque than black? Electrical PVC outdoor pipe is
gray. Go figure.
PS: I heard some paint won't stick to PVC so maybe you need special PVC
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