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TECHNICAL
the pipe-joint compound can be compromised if prolonged exposure to an incompatible chemical is introduced .
Temperature performance range is the temperatures at which the pipe-joint compound will function . Brushability temperatures and performance ranges must be determined prior to selecting a pipe-joint compound , especially if utilized in systems with temperature extremes .
How to apply thread sealant Whether you are applying a thread sealant tape or a pipe-joint compound , always apply them to the male threads . This will reduce the possibility of blocking or restricting the inside of the pipe and fitting .
Tape and joint compound can be used in conjunction with one another . Once the male threads are correctly wrapped with thread tape , you can apply a coating of pipe-joint compound over the thread sealant tape before assembling the joint . Due to pipe and fittings ' NPT tapered design , thread tape is designed to go directly on the male threads to ensure that , as the joint is assembled , the tape will be compacted into the root of the thread . A thread tape ' s elasticity allows it to stretch when applied and does not completely fill the root to the crest of
“ An approved thread sealant is required to fill the remaining voids in the root of the threads to create a seal .” the thread . Applying joint compound on top of the tape will fill any remaining voids as the joint is assembled . Any excess joint compound will be pushed out of the fitting .
Once you have selected the correct tape sealant for your application , you will wrap the tape three to five revolutions in a clockwise motion keeping the tape just above the last male thread of the pipe or fitting . Wrapping the pipe in the same direction that you would screw it into the fitting will prevent the tape from unravelling during assembly .
When applying pipe-joint compound , remember that you are filling the thread openings , so applying the compound in the same direction as the threads will sometimes lead to poorly filled joints . Brushing across the threads will provide better coverage and will ensure that you will always fill the threads .
Having formulated and manufactured thread sealants for more than 70 years , Oatey continuously responds to the changing needs of professional plumbers with new technology , ideas , and products — from low-pressure to high-pressure piping demands , from plastics to metals , as well as the market ' s need for PTFE . PA
About the Author Erin Bullock is applications manager , Oatey Company , and can be reached at technical @ oatey . com .
www . plumbingafrica . co . za @ plumbingonline @ plumbingonline @ PlumbingAfricaOnline November 2021 Volume 27 I Number 9