On threaded male PVC fittings each successive thread is slightly larger in diameter than the one before it. Female threads get successively smaller.
All pipe manufacturers voluntarily follow these standards to assure their customers they are receiving quality materials. The amount of strain increases as the size of the pipe decreases. Therefore it is easier to split smaller diameter threaded joints than larger ones. It is also easier to over-torque smaller diameter fittings because their resistance to torque is less.
Table 1 gives Strain and Tensile Stress levels according to pipe diameter. The resistance of PVC ispounds per square inch psi. The strain per turn past finger tight for one-inch PVC pipe is. Thus, a one-inch threaded PVC joint that is tightened four turns past finger tight will develop a tensile stress of 7, psi. The joint is bound to fail since the stress exceeds the 7, psi tensile strength of PVC, without even adding the tensile stress caused by the pressure inside the irrigation system up to a maximum of 2, psi.
Teflon tape, Teflon paste and pipe dope is intended for metal pipe and fittings. Metal to metal fitting joints are more difficult to tighten than plastic; the surfaces tend to gall without the aid of such lubricants as Teflon or pipe dope.
Plastic fittings do not need this lubrication.
When Teflon tape is wrapped around plastic male threads it adds to the strain and tensile stress. The tendency of most installers is to incorrectly wrap several thickness of tape around the male threads, increasing stain and stress further. Teflon paste and pipe dope, just like Teflon tape, make threaded joints slippery.
Their use on PVC fittings can be an invitation to over-torque. When working with threaded plastic fittings do use a proper sealant. A non-hardening compound is forced by water pressure into potential points of leakage, thereby performing a true sealing function. Tapes and hardening pastes permit a leak path to develop when a joint is backed off, mechanically flexed, or expands with rising temperatures. Finally, a sealing compound must not lubricate the joint to the point that over-tightening is encouraged.
Several sealants on the market meet all these requirements. Do use the same Schedule threaded fittings with the same Schedule pipe and fittings.
Many plastic piping system installers who encounter problems with splitting assume Schedule 40 fittings are weak.
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There are several fallacies in this reasoning. First, all the problems inherent in over-tightening apply as much to Schedule 80 systems as they do Schedule While the walls of female Schedule 80 threaded fittings are thicker, wall thickness does not change stress and strain levels.
See Table 1. Second, installers believe Schedule 80 systems are stronger because they have higher pressure ratings than Schedule 40 systems. This is true only when comparing systems with components that have been cemented together with solvent.
Introduce even one PVC threaded pipe or nipple, and the rating of the entire system must be reduced by 50 percent. Abstract Prevent splitting threaded PVC female fittings. By continuing to use this website, you agree to their use.Log in or Sign up.Anlo ewe
Joined: Oct 31, Location: Illinois. Just finished my latest plumbing project. I installed a RO filter in my laundry room to fill up five-gallon jugs. Everything went very well and it was working flawlessly for the first day.
The next day, two of the screw on connections for the plastic tubing started dripping. I did this to the first connection and it stopped dripping and I have had no further problems with that connection.
The second connection is hard to reach, so when I taped it, I put on too much tape and it rolled up on the threads. Now this connection really leaks! So my question is how do I remove the tape without damaging the plastic threads? Thanks Chad. Joined: Dec 7, The tape doesn't stick to the threads.Sixt vape bulk
You should be able to unscrew the joint and the tape should just peel right off. When you tape, make sure you go in the direction that the female side will screw so that the female side doesn't push against the trailing edge of the tape but rather goes with it.
Also, only put enough tape to cover the threads completely - but not excessively 2 complete revolutions usually works for me - others and pros may differ. Third, you should consider using pipe joint compound.
Some people prefer joint compound to tape. Some prefer tape to compound. Some prefer both Four to six clockwise spiral wraps when looking at the end of the threads; from behind the threads, you go counter clockwise. That's makes the tape tighten as you screw the parts together, Joint compound not made for the specific type of plastic can damage plastic parts and will void warranties on many types of plastics.
Gary SlusserJun 28, Joined: Jan 24, Sounds like the plastic cracked Too much tape on plastic is a problem. Most plastic fitting leaks are caused by damage due to overtightening. Dunbar PlumbingJun 29, Yes over tightening is the prime cause of failure of threaded plastic fittings.
Gary SlusserJul 1, Joined: Nov 12, Location: Ohio. Gary, That is how I have been doing my threads for as long as I can remember.Ea account
The first few times they leaked and I just kept experementing untill I found a combination that worked. CassJul 2, You must log in or sign up to reply here. Show Ignored Content. Similar Threads: Teflon Tape. Share This Page Tweet.
Your name or email address: Do you already have an account?AN thread is a type of fitting used to connect flexible hoses and rigid metal tubing that carry fluid it stems from a joint standard by the U. Army and U. AN thread provides a positive seal that should seal correctly with specified torque torque range with no leaks. The AN should not require a thread sealant.
In contrast to straight threads that are found on a bolt, a tapered thread will pull pipes and fittings tight together, providing effective seal for pipes transporting liquids, gases, steam and other fluids. In a residential home environment, we are primarily transporting non-caustic substances like water, natural gas, Liquified Petroleum Gas LPGfuel oil and maybe compressed air and oxygen.
Although there is no hard and fast rule, we can broadly categorize residential threaded joints as either permanent or semi-permanent joints to identify appropriate applications for thread sealants:. Although Dupont no longer manufacturers Teflon tapes, it still enforces its trademark rights. One very important thing to remember is that PTFE thread sealant tapes and pipe joint compounds are only to be used on NPT male threads.
Neither should be used on SAE mechanical threads or as a gasket sealer i. Since many state and local codes adopted the use of double density tapes when making connections for natural gas, the use of same color for two different thickness presented a challenge when time came to inspect a job. Pipe dope, technically known as pipe joint compound is both a thread lubricant and thread sealing compound.
Unlike a thread sealant tape, pipe dope is designed to make a pipe thread joint leak proof and pressure tight by brushing on a pasty substance to a male thread never to a female thread because some of it will push into the pipe. Some people use pipe dope on top of thread sealant tape but many manufacturers say there is no added benefit to that setup. While there are number of pipe dope product on the market, the one that seems to be most widely accepted by plumbers, pipe fitters, HVAC techs and electricians is products from RectorSeal.
If the thread you are working on will be exposed to extreme temperatures, a better suited product might be a liquid thread sealant called Permatex Thread Sealant with PTFE. This product has the same sealing capabilities but it is also designed to work in a broader range of temperatures to F. I tend to apply both the sealant tape and pipe dope if there is plenty of space around the pipe I am working on or if I am working with black steel pipes generally used for natural gas because their threads tend to be rougher.
I only use sealant tapes for drink water supply lines i. Well, I hope you found my post on pipe thread sealants to be useful and signup for my free newsletter. The sign up form is found on the upper right screen and I promise it will be spam free.Questions and discussions about toilets, sinks, faucets, drainage, venting, water heating, showers, pumps, water quality, and other exclusively PLUMBING related issues. Please refrain from asking where to purchase a product, or business, pricing, or legal questions, or for contractor referrals, or any questions not related to plumbing.
Keep all posts positive and absolutely no advertising. This site is free, ad free, pop-up free and made possible by:. Edited 4 times. If that PEX is going TO the diverter, you already have a bigger problem, because it cause the shower to leak water while filling the tub. The directions should tell you to use a brass or copper pipe to the diverter, NOT any type of plastic. Thanks for the response in my case it's just a shower, the tub hole is plugged in the diverter why would pex cause the shower to leak?
Edited 1 times. The pex fittings will turn after they are crimped. The old polubutylene fittings would not turn after they were crimped.
AN fittings and teflon tape
As far as suppling the valve with pex, there is nothing wrong with that. It meets code. Search for plumbing parts on our sponsor's site:. Special thanks to our sponsor:. Overstrictly plumbing related posts. Post Reply. Please note: Inappropriate messages or blatant advertising will be deleted. We cannot be held responsible for bad or inadequate advice.
Please follow external links with caution. We are exclusively for plumbing questions. Newest Subjects.To take advantage of our new, super-fast delivery option, simply select Ground Shipping method in Cart or Checkout. This option is available at no additional cost! Orders with Free Ground Shipping also qualify!
More details. This product does not meet the new low-lead criteria defined in Safe Drinking Water Act and cannot be used for potable water applications, including for drinking and cooking. This product can be used for non-potable water applications only. While PexUniverse. Since our price for this product is lower then MAP, the manufacturer does not allow us to display our lowest price until you place the product in the shopping cart. This allows us to continue offering our lowest prices while staying consistent with product manufacturer's policy.
This process does not require you to purchase the product - it can be easily removed from shopping cart if needed. We understand that this is an inconvenience and are continually working with manufacturers to educate them on how MAP affects our customers.
Offer Details: To take advantage of our new, super-fast delivery option, simply select Ground Shipping method in Cart or Checkout. Delivery Location. Please provide your Zip code for delivery estimate. Lead-Free Compliance : Effective January 1stall PEX fittings used for new installation or repair of existing potable water systems where water is used for human consumption must be Lead-Free.
Such fittings sold at PexUniverse.
When to use PTFE Teflon Yellow or White tapes or Pipe Dope
Regular brass PEX crimp fittings can still be used for all other applications, including heating, snow melting, etc. Crimp PEX fittings have a long history of reliable performance and can be found in most home improvement stores and plumbing supplies across the country.
Forging method used to produce these fittings ensures exceptional performance at high pressures, which is far superior to that of the cast brass type. With casting method, molten brass is simply pored into a mold, producing a lesser quality product, which is subject to external damage and imperfections.Questions and discussions about toilets, sinks, faucets, drainage, venting, water heating, showers, pumps, water quality, and other exclusively PLUMBING related issues.
Please refrain from asking where to purchase a product, or business, pricing, or legal questions, or for contractor referrals, or any questions not related to plumbing. Keep all posts positive and absolutely no advertising.
Brass Crimp PEX Fittings
This site is free, ad free, pop-up free and made possible by:. Would teflon tape work fine? A little bit of background. I'm splicing into some existing lines in my basement. I have a sink with both hot an cold pex lines, but no outputs for a washing machine, so that's what I'm installing. For some reason, the connections keep leaking. If it's not one, it's another, but usually never 2 at the same time.
I'm no expert, I wouldn't even say I'm experienced. But I have played with pex before when I ran a hot water line for a built-in dishwasher in the kitchen. It doesn't leak, but problem is, I can't remember if I used teflon tape or not.
Any help is appreciated.Create pdf in android example
Mike K Edited 1 times. You need to adjust your crimp tool and make sure your fittings are compatable with your pipe. Stop work and read the information off of the existing pipe Do you have a crimp gauge to check your crimps with? I can gather any additional info within minutes, if it'll help anyone get me an answer, but again, not being experienced I can't say I kno what I'm looking for. In thinking about it tho, I can say that the existing pex lines which are grey an the newer pex lines I've been using white exterior, black interior are different in age, but are the same size.
It only takes a minute to sign up. Some plumbing fittings should be only finger-tight. My friend said I should use 2 wrenches to make these as tight as I can, and then some. As a general rule, fittings with tapered pipe threads NPT should not be assembled to a specific torque because the torque required for a reliable joint varies with thread quality, port and fitting materials, sealant used, and other factors. Leakage path through NPT threads occurs between the very peaks of one thread and the very valley of the opposing thread.
No matter how tight you make NPT threads, a leakage path still exists. It is the function of the sealant to block the path between the male and female thread. Most screwed piping is tightened until it feels "right" and the fitting is pointing in the desired direction. What the experienced mechanic is often "feeling" is how the fitting is getting tight. Screw it into until it starts to seat. Then up the force a little by yanking.
If each yank gives less movement, you probably have a sound joint. If the movement stops suddenly, you have probably bottomed out.
The experienced plumber knows when to stop before he damages the fitting or boss. Caution is advised, tapered pipe fittings into an aluminum boss as excessive torque can crack the boss. This is especially true when using Teflon tape because the low friction of Teflon makes it easy to over-tighten. If using Male and female fitting a seal will be needed eg.
There is no specific torque or other fixed installation technique. Use tape dope, tighten to hand tight, more turns and leak test the bloody thing. This one states 0. This one agrees within rounding error with the second 0. I also recall, but am not finding a reference for a rule of thumb that there should be 3 threads exposed past the fitting the picture in the last link is particularly good at showing why, I think, but does not mention the RoT This sprinkler document does provide something on that line, indicating a range of 3.
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