Flange diameter

For the pipe size between the cylinder and its suction or discharge drum, the diameter of the cylinder connection may be used, provided that the pipe length between the cylinder and drum is not more than twice the cylinder flange diameter and provided that the calculated diameter does not exceed the cylinder connection by more than two standard pipe diameter increments. 

Option 2—If opening exceeds one-half the nominal flange diameter, the flange may be computed as an optional-type reducing flange. 

The standard includes nominal values (flange diameters) of between 25 and 160 mm. A considerable differentiating feature of the various types is the width of the positioning face. Whereas types A, C, and E have a narrow positioning face, B, D, and F have wide ones. The most common type is A according to ISO 12164 type E was specially developed for high-speed cutting (Fig. 3). 

Type (welded flanges/screwed flanges), diameter, length... 

Gasket at flanged joints should preferably have a diameter equal to flange diameter. If the gasket diameter is less then there is a chance of leakage at higher pressures. 

Where more than half the wheel has to be exposed to do the work, the sides of the wheel should taper and the wheel be supported by protective flanges which, for wheels of 300 mm (12 in) diameter or less, shall be not less than half the wheel diameter. For wheels of 300-750 mm (12-29 /2 in) diameter the flange diameter shall be at least the wheel diameter less... 

The construction of Type 3 is similar to that of Type 1 but, due to its geometry, it is capable of working at higher pressures. A layer construction system is adopted, but the layers are typically 2-6 mm thick rather than 0.5 mm. External to the flange diameter are the four lugs that are accessible when the unit is bolted in place in the pipe/duct installation. Apphcations include the following ... 

The cylindrical body then travels to the flanger where the top and bottom edges are curled outward to form the flange. RoU or die-necking are incorporated to reduce the can body diameter on each end in combination with flanging. 

Example 8 Compressible Flow with Friction Losses Calculate the discharge rate of air to the atmosphere from a reservoir at 10 Pa gauge and 20 G through 10 m of straight 2-in Schedule 40 steel pipe (inside diameter = 0.0525 m), and 3 standard radius, flanged 90 elhows. Assume 0.5 velocity heads lost for the elhows. 

Redesign piping layout, using fewer elbows and laterals for tees, and have five or more straight pipe diameters before suction flange. 

Nominal pipe size Outside diameter of flange Thickness of flange, minimum Diameter of holt circle Diameter of holts No. of holts Length through huh ... 

Openings in closures over 50 percent in diameter are designed as flanges in flat closures and as reducers in other closures. Openings of not over one-half of the diameter are to be reinforced as branch connections. 

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