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What is this used for

Im useing it to reduce my pipe from 3/4 to 1/2 inch

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Thats what its used for.

Posted on Apr 26, 2015

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Has 2 inch main water line and 3/4 Inch meter.can I reduce size of pipe to 1 inch


Yes if you reduce the size it will not affect the metre you could reduce to 3/4 and 1/2 for house use.

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I just bought it and delivery man said he could not install it because my vent out of the roof is only 3 inches. Can I just use aluminum tape to secure the vent hose?


Local code determines the minimum size for dryer vents. Often this is determined from the manufacturer's requirements for the appliance. As you may have guessed, this is pretty much the standard for dryer manufacturers.

If you were to "adapt" the dryer's 4" pipe down to your home's existing 3" pipe, you would reduce the pipe's area from 12.6 sq inches to just 7.1 sq inches (radius squared x 3.1415). That's nearly HALF the required area that is required. Your clothes dryer will suffer. Drying times will increase dramatically as there will be less air flow. Electric / gas usage will increase due to the longer running times, and there could be significantly more heat inside the dryer that could be a fire hazard.

Don't do it. Either invest in the correct size dryer vent, or use another venting method instead of reducing the pipe size.

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1 Answer

What size npt thread is the adaptor


Common American National Standard Pipe Taper Threads
  • NPT - National Pipe Thread Taper
  • FPT - female (internal) National Pipe Taper threads
  • MPT - male (external) National Pipe Taper threads
  • NPTF - Dryseal American National Standard Taper Pipe Thread (ANSI B1.20.3)
For NPT threads a sealant compound or Teflon tape must be used for a leak-free seal. For NPTF no sealant is needed for a sealing.
Characteristics of NPT (also known as ANSI/ASME B1.20.1 Pipe Threads, General Purpose):
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  • truncation of roots and crests are flat
  • 60o thread angle
  • pitch is measured in threads per inch
Note! Pipe sizes do not refer to any physical dimensions. The outside diameter of a pipe or fitting must be measured and compared to a table for size identification. A 3/4" NPT pipe thread has an outside diameter - OD - of 1.050 inches.
Each thread size has a defined number of threads per inch - TPI, or pitch. The 3/4" NPT pipe thread has 14 threads per inch. Both the TPI and OD of the thread are required for positive identification of thread size because more than one size have the same TPI.
NPT - American Standard Pipe Thread Taper 1) Pipe Size
(inches) Threads per Inch
TPI - pitch Approximate Length of Thread (inches) Approximate Number of Threads to be Cut Approximate Total thread Makeup, Hand and Wrench (inches) Nominal Outside Pipe Diameter
OD
(inches) Tap Drill
(inches) 1/16" 27 0.313 1/8" 27 3/8 10 1/4 0.405 R 1/4" 18 5/8 11 3/8 0.540 7/16 3/8" 18 5/8 11 3/8 0.675 37/64 1/2" 14 3/4 10 7/16 0.840 23/32 3/4" 14 3/4 10 1/2 1.050 59/64 1" 11-1/2 7/8 10 9/16 1.315 1-5/32 1-1/4" 11-1/2 1 11 9/16 1.660 1-1/2 1-1/2" 11-1/2 1 11 9/16 1.900 1-47/64 2" 11-1/2 1 11 5/8 2.375 2-7/32 2-1/2" 8 1 1/2 12 7/8 2.875 2-5/8 3" 8 1 1/2 12 1 3.500 3-1/4 3-1/2" 8 1 5/8 13 1 1/16 4.000 3-3/4 4" 8 1 5/8 13 1 1/16 4.500 4-1/4 4 1/2" 8 5.000 4-3/4 5" 8 1 3/4 14 1 3/16 5.563 5-9/32 6" 8 1 3/4 14 1 3/16 6.625 6-11/32 8" 8 1 7/8 15 1 5/16 8.625 10" 8 2 16 1 1/2 10.750 12" 8 2 1/8 17 1 5/8 12.750 14" 8 14.000 16" 8 16.000 1) The taper is 1/16 inch in an inch, which is the same as 3/4 inch in a foot (angle 1o 47')
NPT threads are not interchangeable with NPS - National Pipe Straight - threads.
NPT threads may look similar to ISO 7/1 threads. However, ISO and NPT threads should not be mixed. ISO threads have 55o taper angle versus 60o for NPT. The NPT root and crest configurations are also different from ISO. For ISO threads pitch is usually measured in millimeters (may be expressed in Inch). The pitch are different.

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Since your house seems to have 1/2 inch supply to the current water heater, I would suggest staying with the current size. The option is to enlarge the tubing from supply to distribution which can be a major plumbing task. If your current water pressure (at the faucet) is ok, then go with what you have.

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