Which PVC Plastic Pipe to U
SCH Rated Pipe
PVC pipe types labeled “schedule” (abbreviated “SCH“) are made bad on the traditional dimensions ud for steel
pipe. Unfortunately steel has very different strength characteristics from plastic, so it is a system that isn’t very logical for u with PVC pipe. But when plastic first came along it was made to the same size standards that were already in u for steel. The common PVC pipe schedules you will e in stores are SCH 40 and SCH 80. As the pipe sizes rated SCH increa, the strength and pressure rating of SCH pipe decreas. So 1/2″ SCH
40 PVC pipe is very strong, while 2″ SCH 40 PVC has comparatively
a low pressure rating, and is more easily damaged. In sizes 1/2″to 1 1/2″ SCH 40 is a thick wall pipe with a reasonably high pressure rating and good resistance to physical damage. It is often ud for mainlines and other situations where a tough high pressure pipe is needed. Sch 80 is generally ud for making threaded plastic nipples becau the plastic walls are thick enough to have threads cut into them (although most now have molded threads rather than threads “cut” with a die.)
Pressure ratings of SCH 40 PVC pipe:
1/2″ = 600 PSI
3/4″ = 480 PSI
难为男儿汉1″ = 450 PSI
1 1/4″ = 370 PSI
明月几时有歌词1 1/2″ = 330 PSI
2″ = 280 PSI
2 1/2″ = 300 (not a typo, 2.5″ pressure is an oddity)
3″ = 260 PSI
泽的组词
4″ = 220 PSI
As you can e, the pressure ratings drop as the pipe size increas. Note that the industry standar
d rule is that your normal operating pressure should not exceed 1/2 of the rated pipe pressure. In other words, you shouldn’t u 1 1/2″ pipe for pressures higher than 165 PSI (330 x 0.5 = 165 PSI). This is becau pressure surges created by closing valves can easily double the water pressure in the pipe. This rule applies to all PVC pipe, including that labeled SCH and CL.
Class rated pipe藕粉好处
PVC pipe types labeled “Class” (abbreviated “CL“) are bad on the pipe’s pressure rating. So Cl 200 PVC pipe is rated for
200 PSI of water pressure. Cl 315 PVC pipe is rated for 315 PSI of water pressure. The strength of CL labeled pipe is directly related to the pressure rating. The standard “Cl” pipes are Cl 125, Cl 160, Cl 200 and Cl 315. Of the Cl 200 and Cl 315 are most common. Cl 125 is sold as a low cost pipe for u in sprinkler laterals for tho for whom low price is everything. It has a very thin wall and breaks easily if not handled carefully or nicked with a digging tool.
1/2″ size pipe is generally only available in SCH 40. This is becau of the thin wall of 1/2″ pipe makes it very easy to break. I don’t recommend using 1/2″ PVC pipe at all, however if you must, you should u SCH 40. Sometimes you will find 1/2″Cl 125 PVC pipe at discount stores due to the very
low price. The Class system is obviously a more logical system for labeling pipe as you know immediately how strong the pipe is bad on the label. Unfortunately the more confusing “SCH” system became entrenched in the industry and remains.
十大晕车药品牌What Pipe Type to U儒林外史汤奉
All PVC pipe labeled for a given size in the USA has the same outside diameter. So any pipe labeled as 3/4″ will be the same diameter, whether it is SCH 40 or Cl 200 or any other type. That
allows the same fittings to be ud to join the various pipe types together. Most fittings are made to SCH 40 standards, although SCH 80 fittings are available, typically only at specialty plumbing and irrigation stores. Technically most codes require SCH 80 fittings for pipe sizes 2″ or over. In practice I’ve noticed that SCH 40 fittings are often ud up to 3″ size. When dealing with sizes 4″ and above the u of non-glued “rubber ring-joint” fittings is recommended and usually required by code as well. Glueing joints on 3″ and larger PVC pipe is very, very difficult.
“Mainlines” are all of the pipes that are under constant pressure, that is, the pipes that are before the sprinkler zone valves. In most of the industry SCH 40 PVC pipe is ud for irrigation mainlines up to 1 1/2″ size. For 2″ size and larger Cl 315 PVC is ud. Most building codes prohibit the u of 2″ an
酸雨是怎么形成的
d larger SCH 40 PVC pipe for pressurized water lines. Depending on the jurisdiction, this rule may or may not be applied to irrigation systems. Tho same codes generally require that all pressurized PVC pipes (mainlines) be buried at least 18″ deep to protect them from accidental damage, regardless of the type or size of pipe ud.
“Lateral” pipes are the pipes after the sprinkler zone valve. The pipes are only pressurized when the sprinklers are operating. For lateral pipes the standard is to u Cl 200 PVC pipe. Where budget is a concern and you can find it, sometimes Cl 160 is ud. As previously mentioned I recommend you avoid Cl 125 PVC pipe. Laterals can be buried any depth, but I generally recommend at least 10″ deep to avoid a lot of maintenance problems with broken pipes.
This entry was posted on Thursday, May 10th, 2012. (Note: Some posts are derivatives of earlier works by Jess Stryker dating back as early as 1995.) Last modified: Thursday, August 22nd, 2013帽子的英语
