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Class 200 PVC pipe is by far is the most commonly used pipe for landscape irrigation systems.
When plastic pipe was first developed around WWII, the manufactures copied the flow characteristics and rating system of standard steel pipe.
The schedule number is determined by a formula factoring internal working pressure and allowable stress for the pipe walls.
Schedule rated pipe generally has thicker walls which renders it more durable against damage from outside forces. Why 5 feet per Second (FPS)?   Plastic pipes, and more importantly plastic fittings, are designed to handle surge pressures for flows less than 5 FPS. As more experience and research was done, manufacturers decided they could clear up some issues and standardize PVC by manufacturing it to meet an operating pressure specification, thus was born Class rated PVC pipe. Wall thickness for Class rated pipe is determined so the pipe, regardless of diameter, can handle the same working pressure. Class rated pipe has larger inside diameters than Schedule rated pipe, so flow rates can be higher. Personally, unless the physical strength of Schedule rated pipe is needed, use Class rated pipe for landscape irrigation systems. Within seconds the PVC material melts and begins to co-mold together as the chemical reaction of the cement plays out. Nothing holds the pipe and fitting together, so the installer must install thrust blocking or pipe joint restraints. Whether gasketed or solvent weld, all PVC pipe fittings become a little weaker as the size increases. A Poly pipe advantage is the ability to package it in 100’ or 300’ rolls, instead of rigid 20’ lengths like PVC.
In response, the irrigation industry has said Poly pipe should only be used after the control valves for the zone piping, or to install a master valve at the water source. Because the HDPE pipe system technically becomes one piece of pipe (no fittings) it eliminates the biggest source of pipe system failures (the fittings). However, most irrigation contractors have not yet installed HDPE pipe so they don’t know how to use the fusing machines or even how to order the pipe and fittings.
If damaged, it can be repaired using special in-hole fusing units with patch on repair fittings. The chart lists the maximum operating pressure and maximum flow without exceeding 5 per second velocity for the common pipe types and diameters used in landscape irrigation systems.
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Cew Sin products have been tested and certified to conform to the relevant standard specifications set up by SIRIM.
Attach two more short pieces to the elbow joints, creating the front and sides of the cart base. Attach two elbow joints to the final short piece, then connect the elbows to the tops of the side handles. A well equipped laboratory is busy round the clock to control the quality of pipe at each stage of its production. In order to share our hard work and skills for the development of the country’s economy, we are at our best to utilize our expertise and our devotions.

PVC pipe is a type of plastic plumbing pipe primarily used to transport high pressured water.
PEX pipe, also known as cross linked polyethylene pipe, was first manufactured in the 1920s, but has become more popular in recent years.
The final type of plastic plumbing pipe is PolyPipe®, a thick black pipe used to transport highly pressurized water, usually to and from the home. Copper is the most common type of plumbing pipe used in the home, although it is more expensive than plastic piping. Stainless steel pipe is less commonly used than other metal pipes, as it is more expensive and harder to find.
Galvanized pipes have been used in homes for years, typically to carry water in and out of the house. The plumbing you use can qualify as long as it is made from a certain amount of post-consumer recycled material, meets and exceeds standards for safety, uses as little energy as possible to produce, and is made from materials that are sourced within a certain radius. You should keep in mind though that the pipe alone will not make your home qualify for LEED certification. I think it is great that there are new options for plumbing pipes, but I have a few questions I hope people can answer.
There are some users, contractors, and designers who prefer other types of irrigation pipe, namely Polyethylene (Poly) or Schedule 40 PVC. All PVC pipe must maintain the same outside diameter to fit into the fittings, so the inside diameter is what changes. Such as cracks in the crotch of tees and elbows, females threads, and where the threaded section of a male adapter meets the base. For irrigation work, Class 200 is the most oft used, so each diameter of Class 200 PVC pipe is made to handle a continuous operating pressure of 200 PSI.
After a healing time (varies somewhat by pipe diameter and temperature) the fitting and the pipe become one piece of plastic. Getting good solvent weld joints on larger diameter pipe while in a hole is difficult, thus the industry recommends using gasketed fittings for 3″ or larger. The extra cost is easily overcome by the cost and hassle of replacing cracked PVC fittings later on.
The fitting, like gasketed fittings above, use a gasket to make a water tight seal, but also have gripping teeth to hold the fitting on the pipe.
High density Poly pipe is a heavier plastic, so it can handle higher pressures and makes a very durable pipe system.
Indeed, HDPE pipe and fittings below 4″ are not readily available in all areas and will likely be a special order with additional costs for shipping. This forms the square base for the cart, with open connections extending to the sides and top at the rear. Kawsar Engineering started its regular production of unplasticized Polyvinyl Chloride (uPVC) Pressure and non pressure pipe system for cold potable water and other industrial uses in March 2004. We are not only working for monetary gains but for customer’s satisfaction too, by giving them the most pure products. Plastic pipes include polyvinyl chloride (PVC), chlorinated polyvinyl chlorine (CPVC), PEX pipe and PolyPipe®. It is used almost exclusively outdoors, and is usually buried underground to prevent freezing.

It is primarily used in marine environments because it can withstand salt water, which would erode most other metal pipes.
I can tell you from my experience that Pex pipes have tested safe and do not leach any toxins into the water.
From my 40 years’ experience in all angles of the irrigation business, the industry is right. Non-NSF Poly is less costly, but will have greater variation in wall thickness which may cause problems with attaining water tight fitting joints.
However, the irrigation industry still recommends using Poly pipe for zone piping, not mainlines. Use is rapidly growing for golf course irrigation systems and we now see more use on large commercial irrigation job sites. Some will seek permission to substitute PVC in place of HDPE when bidding jobs specified with HDPE pipe. I seem to be having a lot of jobs lately with weird pipe fittings and wanted to try to do a little more research on my own time and was brought here. CPVC is more flexible with substantially thinner walls than PVC pipe, and has the same outer diameter as copper pipe, which increases it's range of uses. However, PEX pipe has a much higher heat resistance than most other plumbing pipe, and is often used in water-based heating systems. The price makes it less desirable for other applications, or in safer areas where a copper pipe would perform just as well. Use of these heavy duty pipes is diminishing, as it is being replaced by PEX pipe, which is less expensive and just as durable. But the EPA has mandated all plumbing be lead free, so all the metal pipes and fittings now made are lead free.
Designers must assure the pressure capacity of the Schedule rated pipe is suitable for the system. Of course there are those who counter that they use Poly for mainlines all the time without issue. Not all pipes are as useful or effective as others, and each type is used for a specific purpose in plumbing.
It comes in a creamy white color, as well as red and blue which is used to denote hot and cold pipes respectively. Type M has very thin walls, while type L is of medium thickness, and type K is the thickest of the three.
There are different types of PEX and only some of them are okay to use in chlorinated water (any system on city water). They have to have substantial evidence to change any type of regulation, which means it may be years after we know something is bad for us, before they actually regulate it.

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