Description

Fluid Controls offers a range of flanges manufactured by it&#**9;s sister concern Hyd-Air Engineering Works, Goa. The use of weld nipple and ferrule type of fittings is widespread for tube sizes upto *8mm OD. For bigger sizes, ferrule and weld nipple type of fittings are impracticable because of their heavy hexagonal sections which increase the pitch between pipes and because of the high torques required for tightening them. Flanges with Butt Weld or Socket Weld ends offer a practical solution to these shortcomings, leading to compact piping installations. CETOP FLANGES: CETOP PR *3H, AFNOR ******4 and ISO ***4 specify flanges with Butt Weld ends and square clamping flanges for **0 bar and **0 bar static working pressures. These correspond to **0 bar and **5 bar dynamic working pressures respectively. The flange system consists of one or two sleeves to be butt or socket welded to the pipe and clamped together between two square flanges by a set of four hex bolts, nuts and spring washers. One of the sleeves carries an "O" ring groove fitted with an "O" ring for sealing the interface. SAE FLANGES: The use of these ISO ***4 flanges has one disadvantage. The size of the square flange requires a higher pitch between pipes due to the flange size. In order to reduce the distance between pipes, SAE introduced their own standards, which are now incorporated into ISO ***2 for ***0 psi and ***0 psi static pressure ranges. The SAE system depends on the same set of butt welding sleeves, held together by a set consisting of a split flange and a solid flange, secured by hex bolts and nuts. The design for SAE flanges calls for forged flanges to ASTM A**5 with sleeves made from weldable material. In order to reduce costs, various manufacturers have introduced a two piece system where the sleeve and the flange are combined into one piece. Such a system is easily adaptable to both the Butt Weld and Socket Weld systems.