Profile: Diamond Flanges & Fittings Pvt. Ltd. is a manufacturer of pipe line flanges and fittings. We are an ISO 9001:2000 certified company. Our products are manufactured as per JIS, ISS, BSS, DIN, ASTM and ASME international standards. We can also manufacture products as per customers' drawings and specifications. We offer various types of flanges including welding neck, lap joint, socket welding, slip-on, threaded, blind, orifice, and plate flanges. Our pipe fittings are 90° elbow, straight tee, reducing elbow, concentric reducer, 180° elbow, saddle, reducing tee, cap, 45° elbow and eccentric reducer. Welding neck flanges are designed with a hub on the backside tapering to a diameter that matches the pipe to which it is welded. These flanges are bored to match the inside diameter of the mating pipe, so there will be no restriction of product flow. This prevents turbulence at the joint and reduces erosion. Welding neck flanges are preferred for use in severe service applications involving high pressure, cold or hot temperatures. They also provide excellent stress distribution through the tapered hub and are easily radiographed for flaw detection. A slip-on flange is bored slightly larger than the outer diameter of the matching pipe. The pipe slips into the flange prior to welding both inside and outside to prevent leaks. These flanges are attached to the pipe by fillet welding at the hub and at the end of the pipe inside the flange. Threaded flanges are threaded in the bore to match an external thread on the pipe. The threads are tapered to create a seal between the flange and pipe as the tapers approach the same diameter. These flanges are normally designed for low pressure and non-cyclic applications. They are also used in applications where welding is hazardous. Our pipe fittings are made up of carbon, stainless and alloy steel.