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Username Post: copper plumbing - corrosion/pinholes only in cold water?        (Topic#354115)
LtFrankDrebin 
Super Senior Member
Posts: 5251
LtFrankDrebin
Loc: Coopersburg, PA
Reg: 01-25-01
11-28-18 04:27 PM - Post#2752708    

This house that we just bought a year and a half ago that was built in 1978 had the cold water circuit fail due to leaks. At first I thought that it was odd that repairs had only been done in the basement on the horizontal cold water pipes. Well, a leak sprung in the vertical pipe heading to the 2nd floor, and then a few weeks after that, a leak sprung in the horizontal pipe in the 2nd floor. I just finished replacing all of the 2nd floor cold water system with CPVC. Question is - should I replace the copper hot water system as well? Knock on wood - there has been no repairs done to the hot water system at all so far. Why is that?

'56 210 Townsman wagon 6cyl/3spd OD | '58 Impala Sierra Gold 348


 




grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 17309
grumpyvette
Age: 71
Loc: FLORIDA USA
Reg: 03-16-01
11-29-18 08:37 AM - Post#2752774    
    In response to LtFrankDrebin

it sure sounds like you have an issue with electrolysis (electrical current flow in the pipes causing damage to the pipes,) as the current causes corrosion

https://www.youtube.com/watch?v=nD5lMITzx_Y

https://www.youtube.com/watch?v=tjz_QoorocM

your electrical system must have a great
separate,electrical ground rod ground, if your using the pluming pipes as a ground source your bound to have issues related to electrolysis

IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!


Edited by grumpyvette on 11-30-18 06:43 AM. Reason for edit: No reason given.

 
wagonman100 
Super Senior Member
Posts: 14228
wagonman100
Loc: Baltimore, MD
Reg: 11-27-04
11-29-18 08:39 PM - Post#2752844    
    In response to grumpyvette

Sounds like it to me too. I have copper in my almost 62 year old house and have never had any problems.

Jay
Friends don’t let friends drive Fords.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon
1957 Cameo Carrier


 
TAT_2 
"18th Year" Silver Supporting Member, and Official CT Grim Reaper
Posts: 35842

Age: 65
Loc: "UNDER THE BOARDWALK"
Reg: 10-29-00
12-01-18 09:38 AM - Post#2752988    
    In response to LtFrankDrebin

FROM THIS OLD HOUSE
Richard Trethewey replies: Generally, leaks in copper pipe can be traced back to a problem with the way the pipes were installed or to the water itself. For instance, flux—the acidic paste used in soldering—react with copper if the pipes stand idle for a long period after installation. This kind of trouble typically crops up near fittings and in cold-water pipes because hot water is better at washing flux away. Also, if a pipe wasn't reamed after being cut, the burr on the inside will cause turbulence—tiny swirls of water so vigorous that they actually wear away the metal. Too much velocity, either from undersized pipes or excessive water pressure, can have the same effect.

Then there's the water itself. Anything abrasive, such as bits of rust or any other contaminant, will scour the inside of the pipe and exacerbate the effects of turbulence and velocity. So-called "aggressive," or acidic, water with a pH of 6.8 or less will eat through copper. Water loaded with dissolved minerals can generate copper-dissolving electrical charges.
BTW,I CHANGED ALL MY COPPER OVER TO HI TEMP PVC,EVEN THE COLD ABOUT 20 YEARS AGO.USED 3/4 IN



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jdk 
"10th Year" Gold Supporting Member
Posts: 440
jdk
Age: 69
Loc: columbus, ohio
Reg: 02-15-10
12-01-18 04:36 PM - Post#2753020    
    In response to TAT_2

i had a pin hole leak in my basement. there was green around the hole. it was in the middle area
of the half inch pipe. jim




 




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