Grooved Segmented Ring Coupling and Flange Joints on Pipe Systems

Huff.... I felt so boring today, may be because I'm to tired, but for Piping & Fabrication I will keep posting, and we reach to the explanation of Grooved Segmented Ring Coupling and Flange Joints. I hope this will make us more understand about piping systems because now I want to take a rest for a while.

Grooved Segmented-Ring Coupling
The type of split coupling shown in Fig. A2.34 is used with either ductile cast-iron or steel pipe that has grooves near the ends which enable the coupling to grip the pipe, in order to prevent disengagement of the joint. The couplings are manufactured in a minimum of two segments for small pipe sizes and several segments for large pipe sizes. Grooved-end fittings are available for use with the couplings. With proper choice of gasket material, the joint is suitable for use above- or underground with nearly any fluid or gas. The joint’s advantages are its

FIGURE A2.34 Victualic coupling for grooved end cast iron steel pipe

FIGURE A2.35 Screwed-on cast-iron flange

FIGURE A2.36 High-hub cast-iron flanges with bitumastic
to protect the exposed threads

•    Ability to absorb minor angular and axial deflections
•    Ability to increase gasket sealing force with increased system pressure
Refer to AWWA C.606, Standard for Grooved and Shouldered Joints.
•    Simplicity for rapid erection or dismantling for systems requiring frequent disassembly.
The coupling is also available in a style where grooving of the pipe ends is not required. Joint separation is prevented by the use of hardened steel inserts (teeth) which grab the mating pipe ends.

TABLE A2.25 Standard Dimensions of Class 125 Flanged Joints for Silver Brazing with
Centrifugally Cast Pipe

Flanged Joints
Flanged ductile or cast-iron pipe is used aboveground for low and intermediate pressures in water-pumping stations, gas works, power and industrial plants, oil refineries, booster stations for water, and gas and oil transmission lines. Cast iron flanges usually are faced and drilled according to ASME B16.1. For flanged joints in a ductile iron pipe, refer to ASME B16.42, ANSI/AWWA C110/A21.10, C111/A21.11, C115/A21.15, and C153/A21.53. Cast-iron pipe is made both with integrally cast flanges and with threaded companion flanges for screwing onto the pipe (as shown in Figs. A2.35 and A2.36). In the latter case, the outside diameter of the pipe conforms to iron pipe size (IPS) dimensions to allow for the threads provided. It is available in sizes NPS 3 (DN 50) through NPS 24 (DN 600) and in length to 18 ft (5.5 m). For lengths less than 3 ft (1 m), in sizes NPS 3 (DN 50) through NPS 12 (DN 300), the flanges may be cast integrally with the pipe, rather than screwed on the pipe, at the manufacturer’s option. Standard dimensions of flanged joints for silver brazing are shown in Table A2.25.