Re: Copper gas line to dryer
Posted by RB on January 06, 2004 at 21:42:42:
In response to Re: Copper gas line to dryer
: I have a question similar to that posted. As it approaches where the gas line would go through the basement floor & up a hole to behind my new gas dryer, there is a copper gas line--it is flexible copper. It is attached on the other side of the shutoff valve in the basement, not far from where it goes through the floor to behind the gas dryer. I was told by the city engeineer that some kinds of copper are approved for gas driers. I would need to know what kind of copper it is. I have the impression from speaking with the gas service supervisor that the kind that is approved to take gas to a gas dryer is that used in refrigerators. Yet everyone is getting on the band wagon, scared to death of copper, although copper is one of the finest materials for many types of workmanship--for ex., the government was considering doing away with the copper penny, because the copper in it was much more valuable than the penny itself. (I am not comparing a penny to a house's plumbing.) I don't know how to find what kind of copper I have on this last strentch of gas line to the dryer. WOuld it be on the copper line? Some "experts" are saying Wardflex is fine--or a variation thereof--these are mainly plumbers, but not always. I fail to have that much confidence in stainless steel--which is what wardflex & its different name brands are, however, it is lined in yellow plastic. One city engineer said the black iron pipe can corrode inside. He said he thinks products like Wardflex is better. I suppose to be conservative, it would be better just to put in black iron (which my plumbing, hearing, ac specialist does not know how to cut. Yet places like Home Depot will cut it for the workman to specifications (if my "workman" will put it in. Anyway, the use of copper raises many questions because I am not convinced it is all that bad--if it is the right kind of copper. My house was custom built 40 years ago--we have had a gas dryer hooked up for some 30 years, and no problems. Still, it fhe black iron is safer, then I will try to get that done before My new dryer is hooked up. Please let us hear your expertise. : What type of joints does it have? Copper is not usually used for natural gas connections, since in some areas the gas is corrosive to copper. You may have seen brass flexible connectors used to connect water heaters, etc.. Without seeing your installation, we cannot tell if it could be a problem or not, since there are other factors that determine its appropriateness besides the material.

: : : I have about a 15 foot run of copper tubing that supplies my natural gas cloths dryer in my crawl space. It connects to the black iron pipe and appears to have been added some time ago. It is all above ground and has no sweated joints. It has never been a concern of mine but I'm selling my home and was told that some inspectors might question this. I've seen copper used before for supply of gas to water heaters. Why do some not like copper for gas lines? Does it matter if the copper is L or M?

Check with a qualified local heating & plumbing specialist if you have one. The use of K or L (not M) is generally accepted as a nat'l spec, however, many state/local codes may restrict those. "K" can use sweat, flare, or compression fittings for gas. "L" can use only compression fittings for gas. "M" is not approved for gas. The wall thickness is different. I.E. nominal 1/4" "K" will be 3/8"(.375) o.d. with a .035 wall thickness. Nominal 1/4" "L" will be 3/8"(.375) o.d. with a .030 wall thickness. Most locations will not approve copper for Natural gas but will for propane.

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