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Q. "How do I know what standard PVC pipe sizes are?"
A. In plumbing the "approximate" inside diameter of the PIPE you're using (known as "nominal" size) is what is used to determine the size of the fittings you'll need. This can be somewhat confusing to someone that doesn't do plumbing on a regular basis. Adding to potential confusion, pipes can have the same outside diameter but come in different thickness (which make the inside diameters vary slightly). If you are not sure what pipe size you have then please look at our pipe sizing chart that shows the outside diameter of the "standard" PVC pipes which are made to be the same outside diameters as steel (galvanized and black) pipe.
Q. "Do I really need to use primer?"
A. Primer is a mixture of solvents used to penetrate the pipe and fittings and start the swelling process ahead of the application of the solvent cement. It is highly recommended that you use primer.
Q. "Do you offer PVC primer?"
A. We have not found a brand of primer that we are confident will not leak in transit. It is highly flammable and, in our opinion, too dangerous to ship.
Q. "What is LO-V.O.C.?"
A. LO-V.O.C. cements produce significantly less amounts of "V.O.C.'s". V.O.C. stands for "volatile organic compounds", which are unhealthy when breathed or induced. V.O.C.'s also diminish air quality. Please read and follow all directions carefully when applying these cements.
Q. "What does schedule or class pipe mean? schedule 40? schedule 80? class 200?"
A. The pipe schedule refers to the pipe wall thickness and is a measure of the pressure a pipe can take without warping or causing failure. The higher the schedule, the thicker the pipe wall. The smaller the diameter of the pipe, the higher the working pressure rating will be. Schedule 40 2" PVC pipe has a working pressure rating of 280 p.s.i., but 1/2" PVC schedule 40 pipe has a working pressure rating of 600 p.s.i. Consequently, each pipe size diameter will have a different working pressure rating. This is not so with PVC Class piping. Class piping designates the working pressure of the pipe to be that of the "Class" no matter what the pipe diameter size is. All diameter sizes of Class 200 piping have a working pressure rating of 200 p.s.i.
• 1/2-inch nominal size pipe:
Schedule 40 has a wall thickness of 0.109 inches and a working pressure rating of 600 p.s.i.
Schedule 80 has a wall thickness of 0.147 inches and a working pressure rating of 850 p.s.i.
Class 200 has a wall thickness of 0.062 inches and a working pressure rating of 200 p.s.i.
• 2-inch nominal size pipe:
Schedule 40 has a wall thickness of 0.154 inches and a working pressure rating of 280 p.s.i.
Schedule 80 has a wall thickness of 0.218 inches and a working pressure rating of 400 p.s.i.
Class 200 has a wall thickness of 0.113 inches and a working pressure rating of 200 p.s.i.
• 4-inch nominal size pipe:
Schedule 40 has a wall thickness of 0.237 inches and a working pressure rating of 220 p.s.i.
Schedule 80 has a wall thickness of 0.337 inches and a working pressure rating of 320 p.s.i.
Class 200 has a wall thickness of 0.214 inches and a working pressure rating of 200 p.s.i.
As you can see, the relationship between class, schedule and wall thickness changes with the pipe's nominal size, we always suggest double checking your pipe size & pipe wall thickness to ensure you are getting the proper equipment every time.
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