Plastics Pipe Connections

A wide range of membrane equipment designs are available for cell recovery and other applications at both pilot and production scale. The inherent containment features vary widely. Some systems only make use of flexible plastic pipe connected by Jubilee clip type fittings. IDF and Triclover sanitary connections are found on devices with a higher degree of engineering. 

The adequacy of available guidance relating to the installation and protection of plastic piping connections to steel mains and... 

Because MidAmerican Energy Corporation s gas construction standards do not estabhsh well-defined criteria for supporting plastic pipe connections to steel mains or for designing or installing its protective sleeves at these connections, these standards do not ensure that connections will be adequately protected from stress intensification. 

Provide a means to ensure that the use of your protective sleeves with your tapping tees at plastic pipe connections to steel mains does not compromise corrosion protection for the connection. (P-98-16)... 

Liquids. Liquids usually are moved through pipelines (qv) by pumps. Special alloys, plastic pipe and liners, glass, and ceramics are widely employed in the chemical industry for transport of corrosive hquids. Care is required in making the connections, to prevent exposure of unprotected metal such as flanges and bolts to the corrosive material inside the piping. 

Plastic pipe or tubing may be used for a wide variety of services. As with all nonmetallic materials, code restrictions limit the applications in which their use is permitted. In general, their use in flammable or toxic service is limited. Plastic tubing of various types may be used for instrument air-signal connections however, as is the case with all nonmetallic applications, the need for fire resistance must be considered. When used)in specialized applications such as potable water or underground fire water, care should be taken to ensure that the specified products are certified by appropriate agencies such as the National Sanitation Foundation and Factory Mutual. 

In the early 1980s, a multitude of patents and patent applications were registered in the field of coextrusion of multi-layer pipes. Meanwhile, a number of pipe products representing a composite of several layers are established products on the market. The technology of the coextruded foam core pipe builds on these developments. The foam core type of PVC plastic pipe today takes the largest volume share of all coextruded foam core products. This product has developed into an important and very competitive alternative for non-pressure applications such as drain pipes, sewer pipes and cable ducts. France has played the role of a pacesetter in this development. Today, over 80% of all pipes for non-pressure applications are produced in the form of foam core pipes in that country. Since the common market realised within the EU is connected with a strong market equalisation tendency, other European countries are following. 

The last kind of speargun requires ittle alteration and works on the ame principle as gas powered spear-uns. On the small home fire extinguishers there is usually a nozzle through which the fire extinguishing substance Is emitted. On some units there is a cone shaped pipe connected to this, which can easily be taken off, leaving nothing but the short nozzle, if this nozzle is plastic, a strong plastic sealant can be used... 

The circnlafing mains consist of 20- to 25-mm plastic pipe extending from fertilizer vessels and run past every in field valve and then vessel. Also passing through every in-field valve in the system in conjunction with fertilizer mains in a high-pressure clear water main connected to a pressure system, which does not circulate. Injection of fertilizer can be done as per requirement of crop in the field, at a single point as well as at multiple points. The advantages of the system can be summarized as follows ... 

Too high a fiow rate will keep debris off of the coupons and may initiate erosion attack on copp>er-base alloys. Low fiow rates may result in excessive corrosion and fouling. Normally, fiow rates of 1-2 m/s (3 to 5 ft/s) are adequate. The coupx)n rack should be connected to the return riser to the tower or at the exit of the hottest part of the system using plastic piping or any other material that will not influence coupmn corrosion rates. For example, do not use galvanized pip>e, coppjer pip e, or brass v Jves to connect the... 

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