Mass
Flow Rate
(Symbol 
)
- See Flow Rate
Including the system called "Roll Groove", and described as follows:
Grooves are "rolled" into the pipe at each end by pressing a roller against the pipe as the pipe is turned to form a groove in the pipe on the outside, and a corresponding protrusion on the inside of the pipe.
Fittings such as Ells and Tees are manufactured with grooves where the fitting is to be connected to pipe or other fittings.
Clamps attach pipes and fittings to each other by catching the groove on each piece to hold the pieces together, with a gasket covering the gap between the two pieces. The two pieces to be joined are lined up, then a gasket is installed over the two pieces, then a two piece clamp is bolted over the top of the gasket, with the lips of the clamp entering the grooves on each piece to lock the two pieces together.
Clamps are available to make rigid or flexible joints. There are grooved systems for Schedule 40 PVC and Steel pipe, and also grooved systems for copper and stainless steel.
Adapting Steel to PVC pipe has always been tricky. The grooved system is an excellent solution to connect PVC pipe to steel pipe resulting in a more reliable joint than threads and in some cases even better than flanges because the grooved clamp provides the flexibility required to reliably connect plastic to steel.
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Schedule 40 PVC Grooved Pipe End |
Schedule 40 Grooved Pipe End |
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Grooved 90 Degree Ell |
Grooved Clamp |
All fittings shown above and below are Hot Dip Galvanized
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Grooved Concentric Reducer |
Grooved Eccentric Reducer |
Related Subjects on this Website:
Type of Impeller found in pumps with specific speed range Ns = 5000 - 10000.
Called Mixed Flow because energy is imparted into the fluid by approximately equal proportions of centrifugal force and diffusion.
Power characteristic is flat exhibiting little change in required power as flow rate increases or decreases.
Mixed Flow pumps may have a more narrow operating window than Francis and Radial Vane impellers.
Related Subjects on this Website:
Glossary - Axial Flow (Impeller / Propeller)
Glossary - Radial Vane (Impeller)
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