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#41
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Can galvanized fittings be used with black iron pipe?
On Jan 21, 10:59*pm, David Nebenzahl wrote:
On 1/21/2011 9:58 PM RicodJour spake thus: I would not mix galvanized and black iron directly, even if it's allowed, as that accelerates corrosion. *You'd have to use a dielectric fitting. Now *that* makes my BS meter twitch just a mite: why would there be corrosion? Galvanized pipe is zinc over steel, so galvanized + steel (black) should be no problem, right? -- Comment on quaint Usenet customs, from Usenet: * *To me, the *plonk...* reminds me of the old man at the public hearing * *who stands to make his point, then removes his hearing aid as a sign * *that he is not going to hear any rebuttals. To add to that. The "zinc" on the galvanised never touches the "black iron". Threading removes the zinc plating in that area and the fittings never screw together far enough for the zinc to touch the unplated pipe/fitting. Harry K |
#42
Posted to alt.home.repair
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Can galvanized fittings be used with black iron pipe?
On Jan 21, 9:19*pm, Mikepier wrote:
Was at Lowes tonight picking up stuff for hooking up my HW heater this weekend and found out they did not have anymore 1/2" Tee's in black iron for my gas line. But they had galvanized 1/2" Tee's. Can I mix the 2? I asked this question of my mechanical engineering mentor nearly ~35 years ago. He's long gone & I have mixed installations that has been in service for over 30 years. He's comment to me back in the 70's was........ "The myth that natural gas causes galvanizing to flake off is an old wives tale that has debunked by testing, go ahead and use it" Here is a link to pretty detailed thread on the subject, including cites from the IRC. http://www4.iccsafe.org/cgi-bin/ulti...c;f=2;t=002632 a couple guys go back & forth but I'm putting my money on the IRC, posts in the cited thread by dsjtecserv & my mentor. He had YEARS of industrial mechanical engineering experience, including being the chief engineer on design & construction of a natural gas to fertilizer plant. YMMV but has been pretty good so far cheers Bob |
#43
Posted to alt.home.repair
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Can galvanized fittings be used with black iron pipe?
On Jan 22, 8:00*pm, David Nebenzahl wrote:
On 1/22/2011 1:08 PM RicodJour spake thus: On Jan 22, 3:38 pm, wrote: On Sat, 22 Jan 2011, RicodJour wrote: On Jan 22, 1:59 am, David Nebenzahl wrote: Now *that* makes my BS meter twitch just a mite: why would there be corrosion? Galvanized pipe is zinc over steel, so galvanized + steel (black) should be no problem, right? Time to recalibrate that meter, kimosabe. *Zinc is used as a sacrificial anode in boats for the very reason that it will corrode first and protect the iron. http://www.mikeholt.com/mojonewsarch...alvanic-Action.... YOur BS meter needs recalibrating. The ZINC may corrode, but that is not an issue here. It is a very thin coating on one surface that is beinf threaded to another (identical) surface. NOT an issue. Period. Why would the zinc corroding not *be an issue? If you have a galvanized pipe and the coating is compromised in any way, the corrosion will be concentrated at that point, right? This still makes no sense to me. (And just for the record, whenever I've plumbed for gas I've used black pipe, not galvanized.) I mean, with black pipe, the entire goddamned pipe and every fitting is subject to corrosion, right? Except for the mill scale, or whatever constitutes the "black" on black pipe, it's completely unprotected. That's why we use galvanized for water. So if you use a galvanized fitting on a run of black pipe, it sure as hell is not going to corrode any faster than the rest of the pipe, so why sweat it *on that basis*? There may be other reasons not to use galvanized with gas lines: all the pros I've talked to about this lately tell me it makes no difference. Nonetheless, most people still use black for gas. -- Comment on quaint Usenet customs, from Usenet: * *To me, the *plonk...* reminds me of the old man at the public hearing * *who stands to make his point, then removes his hearing aid as a sign * *that he is not going to hear any rebuttals.- Hide quoted text - - Show quoted text - To the above I would add that the comparison to the boat use of zinc as a sacrificial anode is invalid, unless the pipe in question is being used in an environment where it's EXPOSED TO AN ELECTROLYTE. The electrolyte essentially completes a circuit that allows current to flow. In the case of boats, that electrolyte is water, or even worse, salt water. With the boat, you have sacraficial zinc plates electrically bonded to the underwater metal parts, ie shafts, props, struts, etc. The circuit looks like two different metals, ie bronze and zinc, sitting in a beaker of salt water. Very similar to the experiment kids can do, using a lemon, a dime, and a penny to make a battery. As the current flow, the zinc erodes and slowly disappears. With galvanized pipe installed on a gas line indoors, you don't have an electrolyte. If it were buried, then you could have an issue. But buried you have an issue with black steel too. I think it's still being allowed in some areas. But it's supposed to be coated and or wrapped with tape to prevent corrosion. A process that is far from perfect. I've seen black steel pipe fail underground in as little as five years. It looked like swiss cheese, hard to believe. But it was obvious what had ocurred. You could see where the installers had used black pipe and then poured the tar like coating over the top of it after it was installed in the trench. The bottom portion did not get coated and that is where the failure ocurrred. I remember at the time, mid 90s, we had the gas company involved in recommending what to do at a 120 unit condo. At that time even they were undecided which was better for that application, either black pipe correctly installed or galvanized. Today, for corrosion issues, plastic is now widely used underground. Over the years gas companies have looked at ALL the issues, including not only what the pipe is carrying, but where it is being used. The only potential problem with galvanized that I've ever seen documented in any way is that which DPB brought up, which is the concern that certain impurities in the gas could lead to the zinc flaking off and ultimately clogging orifices, etc. I don't believe it was ever an issue of the pipe failing, leaking, etc. If galvanic corrosion were a real issue with gas pipe in an application inside a house, the gas companies that allow it would be pretty stupid, no? As would the fire rating, safety, insurance companies, etc. |
#44
Posted to alt.home.repair
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Can galvanized fittings be used with black iron pipe?
On 1/23/2011 2:24 AM, DD_BobK wrote:
On Jan 21, 9:19 pm, wrote: Was at Lowes tonight picking up stuff for hooking up my HW heater this weekend and found out they did not have anymore 1/2" Tee's in black iron for my gas line. But they had galvanized 1/2" Tee's. Can I mix the 2? I asked this question of my mechanical engineering mentor nearly ~35 years ago. He's long gone& I have mixed installations that has been in service for over 30 years. He's comment to me back in the 70's was........ "The myth that natural gas causes galvanizing to flake off is an old wives tale that has debunked by testing, go ahead and use it" Here is a link to pretty detailed thread on the subject, including cites from the IRC. http://www4.iccsafe.org/cgi-bin/ulti...c;f=2;t=002632 a couple guys go back& forth but I'm putting my money on the IRC, posts in the cited thread by dsjtecserv& my mentor. He had YEARS of industrial mechanical engineering experience, including being the chief engineer on design& construction of a natural gas to fertilizer plant. YMMV but has been pretty good so far cheers Bob Well, when I was a kid in the 50s and 60s, someone told me that black iron pipe is used for gas because, when tightening a joint, the pipes grind into one another making a tighter seal. I don't know one way or another .... that's just what I was told. I've heard all the other "tales". The gas (propane) in my new house is neither. It's a corrugated flex line, covered with yellow plasticy rubbery stuff ... looks like yellow heat shrink tubing. |
#45
Posted to alt.home.repair
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Can galvanized fittings be used with black iron pipe?
On 1/22/2011 8:56 PM, RicodJour wrote:
On Jan 22, 8:18 pm, David wrote: On 1/22/2011 3:38 PM Bob F spake thus: My understanding is that sulphur or something in some gas can cause problems with galvanized piping, so if the local supply has it, galvanized may not be allowed. Part of the problem may relate to the zinc flaking off the iron, and plugging orifaces. The drop tube below the "T" to the burner is there to catch such debris, I believe. Y'know, this business of how gas might *possibly* cause the coating to "flake off" of galvanized piping has been brought up several times in this thread. But nobody has provided any evidence for this, not even anecdotal. Certainly no articles in scientific journals or the like. I've been looking for more information as well, and I have to agree with you. There's a lot of conjecture and a lot of argument about it. Like I've said, this topic starts wars. Maybe it's like a plumbing WMD - wars with no foundation! So until I see such evidence, I'm going to write this off as basically urban legend, from the dim, dark past of gas companies who didn't really know *what* was happening. But I still use black pipe only on gas, just from force of habit ... I recently replaced part of the 1.5" black iron condensate return line on our one-pipe steam system. The pipe was original to the house and about 80 years old. A few years back we had a leak on, you guessed it, the night before Christmas Eve. It had rusted through at the first vertical to horizontal transition on its return run. The outside of the pipe was quite rusted in places, and, because of that leak, I figured the pipe was just about done and I wasn't going to wait for another leak. When I busted off the first fitting and removed that first section of pipe, I was quite surprised to see the condition of the inside of the pipe. It looked almost new. There was a thin, uniform black layer coating the inside, and other than that was remarkably clean. There was no rust in the pipe or the fittings. The fitting that leaked was buried inside a wall just about the basement slab and had rusted from the outside in. The old concrete foundation wall had been compromised by water intrustion over the years and what was essentially sand had buried the pipe and kept the outside of the pipe wet enough to rust at an accelerated rate, but there wasn't enough water coming through the foundation to show up inside the living space. I discovered some new-found respect for black iron pipe from that abbreviated replace-it-all project attempt - there was no need. In the same or less time, galvanized pipe of the same size has had to be replaced at several places in the house. This is backwards to what everybody 'knows' -galvanized pipe will last longer than black iron - but I've seen it firsthand. I still don't tell people to go against code and buy the cheaper black iron pipe if code calls for galvanized. When I replaced the section of pipe I had cut out, I replaced it with black iron. I'll let you know in 80 years how it's held up. The codes around here are messed up. Until very recently there was one nearby village that required 3/4" plywood sheathing on the walls and roof, cast iron subsurface rainwater drainage lines, BX electrical cable (say what?!), two layers of 1/2" drywall laid at right angles with both layers taped, and slate roofs. Only when the prices of things got so ridiculous, and the homeowner's started listening to the contractors telling them that the code did not benefit them in any way and only wasted large amounts of money, did the village start modifying their code. But who tells a gas company what to do? R Maybe 5 years ago there was a strong smell of gas outside. The source was where the (cracked) plastic coated now rusted through black pipe emerged from the ground into the valve. I called the gas company and they were there within minutes. There were at least 6 trucks (including one with a backhoe on a trailer) from the gas company out on the street. I asked what that was about and he said everyone who hears the radio broadcast of a gas leak that is nearby needs to drop what they are doing and head to the location. That is because they got dinged a few months back during a structure fire when it took them hours to respond. They have a specific prohibition against galvanized pipe. The foreman said they would replace everything on the outside. They ran a new plastic lateral from the street. Another guy carried in a complete new riser, valve, regulator and meter saddle assembly. The line side had a 90 degree long sweep *galvanized steel* elbow. The plastic adapter was attached on one side and the shutoff on the other side. Gas companies seem to have their own tradition about being impossible to deal with. I own some rentals. The current gas company is a huge outfit. They purchased the regional provider that served our area. One tenant announced they were moving out so something told me to call the gas company and verify that the service would transfer to my name as it did previously. I called and they said they did not know who I was. I provided them with the meter numbers and the accounts that were generated on previous occasions. I also provided them with the account for our house. They said since they didn't know me I would need to fill out some form and fax (who uses fax) it to them. They said it would take two weeks to process? I asked if I could stop by their office and they said they no longer had offices open to the public. I asked if I could fill out the form on their web site and they said they don't have that available. Since the tenant was moving out in a few days I persisted and ended up talking to some VP who insisted it was the fault of the customer service person who answered my call. I asked him to describe what authority the customer service person had to solve the problem and he said they had none. I then suggested he needed to look in the mirror if he wanted to see the problem. |
#46
Posted to alt.home.repair
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Can galvanized fittings be used with black iron pipe?
On Jan 23, 7:48 am, wrote:
To the above I would add that the comparison to the boat use of zinc as a sacrificial anode is invalid, unless the pipe in question is being used in an environment where it's EXPOSED TO AN ELECTROLYTE. The electrolyte essentially completes a circuit that allows current to flow. In the case of boats, that electrolyte is water, or even worse, salt water. With the boat, you have sacraficial zinc plates electrically bonded to the underwater metal parts, ie shafts, props, struts, etc. The circuit looks like two different metals, ie bronze and zinc, sitting in a beaker of salt water. Very similar to the experiment kids can do, using a lemon, a dime, and a penny to make a battery. As the current flow, the zinc erodes and slowly disappears. With galvanized pipe installed on a gas line indoors, you don't have an electrolyte. If it were buried, then you could have an issue. But buried you have an issue with black steel too. I think it's still being allowed in some areas. But it's supposed to be coated and or wrapped with tape to prevent corrosion. A process that is far from perfect. I've seen black steel pipe fail underground in as little as five years. It looked like swiss cheese, hard to believe. But it was obvious what had ocurred. You could see where the installers had used black pipe and then poured the tar like coating over the top of it after it was installed in the trench. The bottom portion did not get coated and that is where the failure ocurrred. I remember at the time, mid 90s, we had the gas company involved in recommending what to do at a 120 unit condo. At that time even they were undecided which was better for that application, either black pipe correctly installed or galvanized. Today, for corrosion issues, plastic is now widely used underground. Over the years gas companies have looked at ALL the issues, including not only what the pipe is carrying, but where it is being used. The only potential problem with galvanized that I've ever seen documented in any way is that which DPB brought up, which is the concern that certain impurities in the gas could lead to the zinc flaking off and ultimately clogging orifices, etc. I don't believe it was ever an issue of the pipe failing, leaking, etc. If galvanic corrosion were a real issue with gas pipe in an application inside a house, the gas companies that allow it would be pretty stupid, no? As would the fire rating, safety, insurance companies, etc. I can not argue with any of that, even though it does poke large holes in my argument. On the plus side - I did get to get in a nice plug for the marine industry. We've agreed on the following: - that the IRC and many other codes allow mixing galvanized and black iron pipe in distribution lines - that there is little likelihood of there being any problems by doing so - that some local codes and gas utilities prohibit using galvanized pipe - that it is mandatory that people contemplating using galvanized pipe in gas installations check with their gas utility and/or local code to see if it is permitted. Now, how do we erase all of the extraneous back-and-forth on the topic on the Internet so people will have a clear, simple grasp of the issues? R |
#47
Posted to alt.home.repair
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Can galvanized fittings be used with black iron pipe?
On 1/23/2011 9:27 AM, RicodJour wrote:
On Jan 23, 7:48 am, wrote: To the above I would add that the comparison to the boat use of zinc as a sacrificial anode is invalid, unless the pipe in question is being used in an environment where it's EXPOSED TO AN ELECTROLYTE. The electrolyte essentially completes a circuit that allows current to flow. In the case of boats, that electrolyte is water, or even worse, salt water. With the boat, you have sacraficial zinc plates electrically bonded to the underwater metal parts, ie shafts, props, struts, etc. The circuit looks like two different metals, ie bronze and zinc, sitting in a beaker of salt water. Very similar to the experiment kids can do, using a lemon, a dime, and a penny to make a battery. As the current flow, the zinc erodes and slowly disappears. With galvanized pipe installed on a gas line indoors, you don't have an electrolyte. If it were buried, then you could have an issue. But buried you have an issue with black steel too. I think it's still being allowed in some areas. But it's supposed to be coated and or wrapped with tape to prevent corrosion. A process that is far from perfect. I've seen black steel pipe fail underground in as little as five years. It looked like swiss cheese, hard to believe. But it was obvious what had ocurred. You could see where the installers had used black pipe and then poured the tar like coating over the top of it after it was installed in the trench. The bottom portion did not get coated and that is where the failure ocurrred. I remember at the time, mid 90s, we had the gas company involved in recommending what to do at a 120 unit condo. At that time even they were undecided which was better for that application, either black pipe correctly installed or galvanized. Today, for corrosion issues, plastic is now widely used underground. Over the years gas companies have looked at ALL the issues, including not only what the pipe is carrying, but where it is being used. The only potential problem with galvanized that I've ever seen documented in any way is that which DPB brought up, which is the concern that certain impurities in the gas could lead to the zinc flaking off and ultimately clogging orifices, etc. I don't believe it was ever an issue of the pipe failing, leaking, etc. If galvanic corrosion were a real issue with gas pipe in an application inside a house, the gas companies that allow it would be pretty stupid, no? As would the fire rating, safety, insurance companies, etc. I can not argue with any of that, even though it does poke large holes in my argument. On the plus side - I did get to get in a nice plug for the marine industry. We've agreed on the following: - that the IRC and many other codes allow mixing galvanized and black iron pipe in distribution lines - that there is little likelihood of there being any problems by doing so - that some local codes and gas utilities prohibit using galvanized pipe - that it is mandatory that people contemplating using galvanized pipe in gas installations check with their gas utility and/or local code to see if it is permitted. Now, how do we erase all of the extraneous back-and-forth on the topic on the Internet so people will have a clear, simple grasp of the issues? R How can something so simple become so complex? :-) TDD |
#48
Posted to alt.home.repair
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Can galvanized fittings be used with black iron pipe?
On Jan 23, 10:29*am, The Daring Dufas
wrote: On 1/23/2011 9:27 AM, RicodJour wrote: We've agreed on the following: - that the IRC and many other codes allow mixing galvanized and black iron pipe in distribution lines - that there is little likelihood of there being any problems by doing so - that some local codes and gas utilities prohibit using galvanized pipe - that it is mandatory that people contemplating using galvanized pipe in gas installations check with their gas utility and/or local code to see if it is permitted. Now, how do we erase all of the extraneous back-and-forth on the topic on the Internet so people will have a clear, simple grasp of the issues? How can something so simple become so complex? :-) Human nature...? Just bring up the subject of helmets on a cycling newsgroup. Everyone is 100% right, adamant about it, and nobody agrees. R |
#49
Posted to alt.home.repair
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Can galvanized fittings be used with black iron pipe?
The Daring Dufas wrote:
On 1/23/2011 9:27 AM, RicodJour wrote: On Jan 23, 7:48 am, wrote: To the above I would add that the comparison to the boat use of zinc as a sacrificial anode is invalid, unless the pipe in question is being used in an environment where it's EXPOSED TO AN ELECTROLYTE. The electrolyte essentially completes a circuit that allows current to flow. In the case of boats, that electrolyte is water, or even worse, salt water. With the boat, you have sacraficial zinc plates electrically bonded to the underwater metal parts, ie shafts, props, struts, etc. The circuit looks like two different metals, ie bronze and zinc, sitting in a beaker of salt water. Very similar to the experiment kids can do, using a lemon, a dime, and a penny to make a battery. As the current flow, the zinc erodes and slowly disappears. With galvanized pipe installed on a gas line indoors, you don't have an electrolyte. If it were buried, then you could have an issue. But buried you have an issue with black steel too. I think it's still being allowed in some areas. But it's supposed to be coated and or wrapped with tape to prevent corrosion. A process that is far from perfect. I've seen black steel pipe fail underground in as little as five years. It looked like swiss cheese, hard to believe. But it was obvious what had ocurred. You could see where the installers had used black pipe and then poured the tar like coating over the top of it after it was installed in the trench. The bottom portion did not get coated and that is where the failure ocurrred. I remember at the time, mid 90s, we had the gas company involved in recommending what to do at a 120 unit condo. At that time even they were undecided which was better for that application, either black pipe correctly installed or galvanized. Today, for corrosion issues, plastic is now widely used underground. Over the years gas companies have looked at ALL the issues, including not only what the pipe is carrying, but where it is being used. The only potential problem with galvanized that I've ever seen documented in any way is that which DPB brought up, which is the concern that certain impurities in the gas could lead to the zinc flaking off and ultimately clogging orifices, etc. I don't believe it was ever an issue of the pipe failing, leaking, etc. If galvanic corrosion were a real issue with gas pipe in an application inside a house, the gas companies that allow it would be pretty stupid, no? As would the fire rating, safety, insurance companies, etc. I can not argue with any of that, even though it does poke large holes in my argument. On the plus side - I did get to get in a nice plug for the marine industry. We've agreed on the following: - that the IRC and many other codes allow mixing galvanized and black iron pipe in distribution lines - that there is little likelihood of there being any problems by doing so - that some local codes and gas utilities prohibit using galvanized pipe - that it is mandatory that people contemplating using galvanized pipe in gas installations check with their gas utility and/or local code to see if it is permitted. Now, how do we erase all of the extraneous back-and-forth on the topic on the Internet so people will have a clear, simple grasp of the issues? R How can something so simple become so complex? :-) TDD People from different states/countries each talking about a zillion different sets of rules? |
#50
Posted to alt.home.repair
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Can galvanized fittings be used with black iron pipe?
On Sat, 22 Jan 2011 21:22:14 -0800 (PST), Harry K
wrote: On Jan 21, 10:59Â*pm, David Nebenzahl wrote: On 1/21/2011 9:58 PM RicodJour spake thus: I would not mix galvanized and black iron directly, even if it's allowed, as that accelerates corrosion. Â*You'd have to use a dielectric fitting. Now *that* makes my BS meter twitch just a mite: why would there be corrosion? Galvanized pipe is zinc over steel, so galvanized + steel (black) should be no problem, right? -- Comment on quaint Usenet customs, from Usenet: Â* Â*To me, the *plonk...* reminds me of the old man at the public hearing Â* Â*who stands to make his point, then removes his hearing aid as a sign Â* Â*that he is not going to hear any rebuttals. To add to that. The "zinc" on the galvanised never touches the "black iron". Threading removes the zinc plating in that area and the fittings never screw together far enough for the zinc to touch the unplated pipe/fitting. Harry K More or less true - but "some" galvanized fittings appear to have zinc in the female threaded portion. Not with hot dip galvanizing, for sure - but in "bright zinc" "galvanizing". This does not change the fact that the zinc is NOT a corrosion risk. |
#51
Posted to alt.home.repair
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Can galvanized fittings be used with black iron pipe?
On Jan 23, 7:27*am, RicodJour wrote:
On Jan 23, 7:48 am, wrote: To the above I would add that the comparison to the boat use of zinc as a sacrificial anode is invalid, unless the pipe in question is being used in an environment where it's EXPOSED TO AN ELECTROLYTE. * The electrolyte essentially completes a circuit that allows current to flow. *In the case of boats, that electrolyte is water, or even worse, salt water. With the boat, you have sacraficial zinc plates electrically bonded to the underwater metal parts, ie shafts, props, struts, etc. * The circuit looks like two different metals, ie bronze and zinc, sitting in a beaker of salt water. * Very similar to the experiment kids can do, using a lemon, a dime, and a penny to make a battery. *As the current flow, the zinc erodes and slowly disappears. With galvanized pipe installed on a gas line indoors, you don't have an electrolyte. * If it were buried, then you could have an issue. *But buried you have an issue with black steel too. *I think it's still being allowed in some areas. *But it's supposed to be coated and or wrapped with tape to prevent corrosion. * A process that is far from perfect. * I've seen black steel pipe fail underground in as little as five years. *It looked like swiss cheese, hard to believe. * But it was obvious what had ocurred. * You could see where the installers had used black pipe and then poured the tar like coating over the top of it after it was installed in the trench. * The bottom portion did not get coated and that is where the failure ocurrred. * I remember at the time, mid 90s, we had the gas company involved in recommending what to do at a 120 unit condo. * At that time even they were undecided which was better *for that application, either black pipe correctly installed or galvanized. * Today, for corrosion issues, plastic is now widely used underground.. Over the years gas companies have looked at ALL the issues, including not only what the pipe is carrying, but where it is being used. * The only potential problem with galvanized that I've ever seen documented in any way is that which DPB brought up, which is the concern that certain impurities in the gas could lead to the zinc flaking off and ultimately clogging orifices, etc. * I don't believe it was ever an issue of the pipe failing, leaking, etc. * If galvanic corrosion were a real issue with gas pipe in an application inside a house, the gas companies that allow it would be pretty stupid, no? *As would the fire rating, safety, insurance companies, etc. I can not argue with any of that, even though it does poke large holes in my argument. On the plus side - I did get to get in a nice plug for the marine industry. * We've agreed on the following: - that the IRC and many other codes allow mixing galvanized and black iron pipe in distribution lines - that there is little likelihood of there being any problems by doing so - that some local codes and gas utilities prohibit using galvanized pipe - that it is mandatory that people contemplating using galvanized pipe in gas installations check with their gas utility and/or local code to see if it is permitted. Now, how do we erase all of the extraneous back-and-forth on the topic on the Internet so people will have a clear, simple grasp of the issues? R Use Google. Erase....... it is similar to Google.Takeback (what you use when you want retrieve an email or posting that you wish you hadn't sent.) cheers Bob |
#52
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Can galvanized fittings be used with black iron pipe?
DD_BobK wrote:
.... Now, how do we erase all of the extraneous back-and-forth on the topic on the Internet so people will have a clear, simple grasp of the issues? R Use Google. Erase....... it is similar to Google.Takeback (what you use when you want retrieve an email or posting that you wish you hadn't sent.) .... Can't help; once a posting hits usenet, it's gone. Virtually no servers honor cancel messages. -- |
#53
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Can galvanized fittings be used with black iron pipe?
On Jan 23, 3:37*pm, DD_BobK wrote:
On Jan 23, 7:27*am, RicodJour wrote: Now, how do we erase all of the extraneous back-and-forth on the topic on the Internet so people will have a clear, simple grasp of the issues? Use Google. Erase....... it is similar to Google.Takeback (what you use when you want retrieve an email or posting that you wish you hadn't sent.) Would that it were so. That only works with Google posting, right? I'm talking about all of the forums and sources out there where this topic comes up repeatedly and the same information gets batted about. Since we've 'solved' it, we should save other people from having to wade through the extraneous and misleading information. Maybe post a Wikipedia article and just point back to that whenever it comes up here? Post the Wiki link on those other forums? R |
#54
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Can galvanized fittings be used with black iron pipe?
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#55
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Can galvanized fittings be used with black iron pipe?
On Jan 23, 5:50*pm, Oren wrote:
To much zinc in the making of *brass might cause a brass fitting (PEX connector) to leak. Why in the world would the Chinese use too much zinc in the copper alloy? That would be unethical and greedy. Could never happen. R |
#56
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Can galvanized fittings be used with black iron pipe?
On 1/23/2011 7:27 AM RicodJour spake thus:
[massive snipola] Now, how do we erase all of the extraneous back-and-forth on the topic on the Internet so people will have a clear, simple grasp of the issues? Like they say, good luck with that! -- Comment on quaint Usenet customs, from Usenet: To me, the *plonk...* reminds me of the old man at the public hearing who stands to make his point, then removes his hearing aid as a sign that he is not going to hear any rebuttals. |
#57
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Can galvanized fittings be used with black iron pipe?
On 1/23/2011 5:39 AM Art Todesco spake thus:
On 1/23/2011 2:24 AM, DD_BobK wrote: On Jan 21, 9:19 pm, wrote: Was at Lowes tonight picking up stuff for hooking up my HW heater this weekend and found out they did not have anymore 1/2" Tee's in black iron for my gas line. But they had galvanized 1/2" Tee's. Can I mix the 2? I asked this question of my mechanical engineering mentor nearly ~35 years ago. He's long gone& I have mixed installations that has been in service for over 30 years. He's comment to me back in the 70's was........ "The myth that natural gas causes galvanizing to flake off is an old wives tale that has debunked by testing, go ahead and use it" Here is a link to pretty detailed thread on the subject, including cites from the IRC. http://www4.iccsafe.org/cgi-bin/ulti...c;f=2;t=002632 a couple guys go back& forth but I'm putting my money on the IRC, posts in the cited thread by dsjtecserv& my mentor. He had YEARS of industrial mechanical engineering experience, including being the chief engineer on design& construction of a natural gas to fertilizer plant. YMMV but has been pretty good so far Well, when I was a kid in the 50s and 60s, someone told me that black iron pipe is used for gas because, when tightening a joint, the pipes grind into one another making a tighter seal. I don't know one way or another .... that's just what I was told. I've heard all the other "tales". What you heard was essentially correct. When you tighten a pipe fitting with any kind of metal pipe--black iron, galvanized, brass, bronze, etc., both threads deform--in other words, get squished--enough to remove almost all gaps between them. That's how pipes get sealed. (What few microscopic gaps may be left are filled by Teflon tape or pipe thread compound.) -- Comment on quaint Usenet customs, from Usenet: To me, the *plonk...* reminds me of the old man at the public hearing who stands to make his point, then removes his hearing aid as a sign that he is not going to hear any rebuttals. |
#58
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Can galvanized fittings be used with black iron pipe?
Best laugh I've had in a long time. Thanks.
-- Christopher A. Young Learn more about Jesus www.lds.org .. "RicodJour" wrote in message ... On Jan 23, 5:50 pm, Oren wrote: To much zinc in the making of brass might cause a brass fitting (PEX connector) to leak. Why in the world would the Chinese use too much zinc in the copper alloy? That would be unethical and greedy. Could never happen. R |
#59
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Can galvanized fittings be used with black iron pipe?
On 1/23/2011 6:26 PM, RicodJour wrote:
On Jan 23, 5:50 pm, wrote: To much zinc in the making of brass might cause a brass fitting (PEX connector) to leak. Why in the world would the Chinese use too much zinc in the copper alloy? That would be unethical and greedy. Could never happen. R So that people who want cheap stuff will have things to buy? |
#60
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Can galvanized fittings be used with black iron pipe?
replying to David Nebenzahl, villiewe wrote:
Simple: I assumed the black iron was so you could tell which lines were gas while galvanized was water. When I had this house inspected 41 years ago before buying, he suggested I ask the owner was was the purpose of the galvanized iron going to the attic! I paid him anyway! -- for full context, visit https://www.homeownershub.com/mainte...pe-616549-.htm |
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