Pinhole Leak In Cast Iron Elbow For Water Heater. - HVAC - Page 2 - DIY Chatroom Home Improvement Forum


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Old 01-10-2012, 11:41 PM   #16
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pinhole leak in cast iron elbow for water heater.


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Well I have the new 90 degree elbow, union, and 2 short pipe sections all ready to be installed. I'm just hoping to make it thru the next few cold months before I have to drain the system.
One fix i have done, is get a real fine wire and see if the small pin hole goes about straight in. If it does then i take pressure off and water out, Drill into the pin hole all the way through into the pipe , then i use a 1/8 in tape, and then plug it. it has worked many times for me, in both large gas or water, or steam lines. Paul

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Old 01-10-2012, 11:55 PM   #17
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pinhole leak in cast iron elbow for water heater.


I personally prefer to do regular maintenance on boilers whether its a hot water boiler or steam boiler I like to drain them down completely before the season starts and get all the crud flushed out of the system and add rust inhibitor to the system.
On bigger steam systems I like to see some water drained out of system on a daily basis and refilled to keep crud from collecting,then maybe once a week depending on amount of use and how the water looks during the week ill completely shut down the system and give system a good flushing out till water looks clean out bottem of tank and refill/add rust inhibitor.
For smaller residential hot water boilers I like to completely drain/flush crud out before start of season then add inhibitor and refill system,one the small systems id say youd generally draining 5-10 gallons out bottem drain every couple weeks and topping system off.
Id fix that leak and service pump at same time.
Its amazing how bad the inside of boilers can get from not doing basic maintenance on them,it makes a huge differance in the boilers efficiency also
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Old 01-15-2012, 07:36 PM   #18
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pinhole leak in cast iron elbow for water heater.


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One fix i have done, is get a real fine wire and see if the small pin hole goes about straight in. If it does then i take pressure off and water out, Drill into the pin hole all the way through into the pipe , then i use a 1/8 in tape, and then plug it. it has worked many times for me, in both large gas or water, or steam lines. Paul
Do you mean tap? Like thread it and put a screw in? I have hear others make that suggestion here, but some say that is only temporary also. It isn't pumbing, so I don't need to worry about debris getting stuck on a screw. But is tapping the pipe just delaying the fix for another year? It is a cast iron elbow, and fairly thick...but not that thick. I could see it holding for a few years, but the rust would just continue around the tap I would imagine.
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Old 01-15-2012, 08:40 PM   #19
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pinhole leak in cast iron elbow for water heater.


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Do you mean tap? Like thread it and put a screw in? I have hear others make that suggestion here, but some say that is only temporary also. It isn't pumbing, so I don't need to worry about debris getting stuck on a screw. But is tapping the pipe just delaying the fix for another year? It is a cast iron elbow, and fairly thick...but not that thick. I could see it holding for a few years, but the rust would just continue around the tap I would imagine.
No i am not talking about a screw. I am talking about drilling it the right size and use a 1/8" pipe tape then you get yourself a 1/8" pipe plug put pipe dope on it and screw it in. That is not a temporary fix. Your hardware will have the pipe tape and tell you what size drill bit you need. Paul
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Old 01-15-2012, 08:51 PM   #20
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pinhole leak in cast iron elbow for water heater.


Ayuh,.... If it's already rusted through in a spot,......
I'd be concerned there ain't enough solid metal left to support any threads, of any sort....
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Old 01-15-2012, 09:30 PM   #21
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pinhole leak in cast iron elbow for water heater.


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Ayuh,.... If it's already rusted through in a spot,......
I'd be concerned there ain't enough solid metal left to support any threads, of any sort....
You are right , if its a old pipe that has rusted through, then he needs to replace
it i have had pin holes in new fitting that i have fixed with a plug. I can't see his pipe so i don't what he has. Paul
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Old 01-15-2012, 11:01 PM   #22
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pinhole leak in cast iron elbow for water heater.


There isn't much to see. Even if I took a photo, it's such a small pinhole. But water was dripping out steadilly. Maybe one drip every 5 seconds. It is impossible to tell what is going on under the surface. And now it has a pipe clamp and rubber patch covering it. I guess I can try drilling it and see what happens before replacing the section.
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Old 01-15-2012, 11:25 PM   #23
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pinhole leak in cast iron elbow for water heater.


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There isn't much to see. Even if I took a photo, it's such a small pinhole. But water was dripping out steadilly. Maybe one drip every 5 seconds. It is impossible to tell what is going on under the surface. And now it has a pipe clamp and rubber patch covering it. I guess I can try drilling it and see what happens before replacing the section.
that's about all you can do. Paul
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Old 01-16-2012, 06:21 PM   #24
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pinhole leak in cast iron elbow for water heater.


ok. thanks.

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