Flanges

Slip on Flange is essentially a ring that is placed over the pipe end, with the flange face extending from the end of the pipe by enough distance to apply a weld bead on the inside diameter. The OD of slip on flange is also welded on the back side of the flange.

The pipe flanges are the second most used joining method after welding. They are used when joints need dismantling. It provides flexibility for maintenance. Flange connects the pipe with various equipment and valves. Breakup flanges are added in the pipeline system if regular maintenance is required during plant operation.

A flanged joint is composed of three components; flanges, gaskets, and bolting; which are assembled by pipe fitter. Special controls are required in the selection and application of all these elements to attain a joint, which has acceptable leak tightness.

However, it is not advisable to use a flange connection in underground piping when it supposed to be buried. The flange is also the most common source of leak and fire in a process plant. There are a variety of flanges available to suit the requirements.

Materials used:
Alloy steel
Carbon steel
Stainless steel
Cast iron
Rubber
PVC
Thermoplastics
Aluminum
Brass
Bronze etc.

Stainless Steel : ASTM A 182, A 240

Grade : F304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H,904L, Duplex stainless steel UNS S31803, 2205, Super Duplex stainless steel UNS S32750

Carbon Steel : ASTM A 105, ASTM A 181

Alloy Steel : ASTM A 182, GR F1, F11, F22, F5, F9, F91

Nickel Alloys : Monel 400 & Monel 500, Inconel 600 & Inconel 625, Incolloy 800, Incolloy 825, Hastelloy C22, Hastelloy C276

Copper Alloys : Copper, Brass & Gunmetal


Socket Weld Flanges available in:-

Stainless Steel Socket Weld Flange
Alloy Steel Socket Weld Flange
Carbon Steel Socket Weld Flange
Nickel Alloy Socket Weld Flange
Copper Alloy Socket Weld Flange

Orifice Flanges or ORF are used with orifice flow meter that is why it called orifice flanges. The purpose of orifice meter is to measure the flow rate of either liquids or gasses that pass through the pipe. These flanges are always used in a set of two. Two flanges, Orifice Plate, Gaskets, Pressure taps and Jack screw hole with two jack screws.

Orifice flanges are available from Class #300 to Class #2500. Class #300 flanges are available in threaded, slip-on and weld neck end types. Whereas, Class# 600 and above flanges are available in only weld neck type end connection.  Dimensions of these flanges are covered in ASME B16.36. Orifice plate is a specially designed plate with a hole at center that creates a pressure drop to measure the flow rate. Please note that orifice plate is not interchangeable. It means you cannot use orifice plate of water line into the hydrocarbon line. Size of the hole and the angle, are specifically designed for the service.

There are only two types of flange faces are available in orifice flange. Raised face and RTJ face. Therefore, only spiral wound and RTJ gaskets are used that too in the set of two for each side of the orifice. These jack screws are drilled on the flange circle centerline at 90 degrees to the tapped hole and used to facilitate separating the flanges for inspection or replacement of the Orifice Plate and gaskets.

Tap holes are either tapped  NPT or  NPS socket connection. A one tap hole from each flange is used to connect instruments with the help of tube that allows liquid or gas to reach the instrument. The other one hole is sealed with a plug. Orifice flanges are installed in a straight run of pipe in order to avoid turbulence at the plate. As a rule of thumb, an orifice flange has ten diameters of straight pipe upstream and five diameters of straight pipe downstream. In general pressure taps kept at the same elevation to each other.

Standard: ANSI B16.5
Pressure: CLASS 150, 300, 600, 900, 1500, 2500
Size: 1/2-48
Standard: AMSE B16.47 SER.B(API605)
Pressure: CLASS 75,150,300,600,900
Size: 26-60
Standard: AMSE B16.47
Pressure: CLASS 150,300,600,900

The most common material grade used is A105 forged carbon steel, with sizes ranging from 1/2“ – 24” in ASME B16.5, 26” – 60” in ASME B16.47, and 26” – 96” in B16.1 (for temperatures ranging from ambient up to 1,000 Fahrenheit and pressure between 20 – 6,170 psi).

Modern carbon is a common steel with carbon content up to 2.1% by weight and primarily alloyed with iron. The term “carbon steel” may also be used to call out steel which does not have a large amount of chromium or nickel. The carbon content can vary for A105 with a maximum allowable of 0.35 as a percentage composition. As the carbon content increases, the steel hardens and increases in strength through heat treatment processes 

ASTM A105, ASTM A182, ASTM A694, ASTM A516, and ASTM A350 are available

These flanges are available in many types like socket weld flanges, blind flanges, weld neck flanges, and slip-on flanges, etc

Lap Joint Flanges have all the same common dimensions as any other flange named on this page however it does not have a raised face, they used in conjunction with a "Lap Joint Stub End".
These flanges are nearly identical to a Slip On flange with the exception of a radius at the intersection of the flange face and the bore to accommodate the flanged portion of the Stub End.
Their pressure-holding ability is little, if any, better than that of Slip On flanges and the fatigue life for the assembly is only one tenth that of Welding Neck flanges.
They may be used at all pressures and are available in a full size range. These flanges slip over the pipe, and are not welded or otherwise fastened to it. Bolting pressure is transmitted to the gasket by the pressure of the flange against the back of the pipe lap (Stub End). 

Lap Joint flanges have certain special advantages:
Freedom to swivel around the pipe facilitates the lining up of opposing flange bolt holes.
Lack of contact with the fluid in the pipe often permits the use of inexpensive carbon steel flanges with corrosion resistant pipe.
In systems which erode or corrode quickly, the flanges may be salvaged for re-use.

The pipe flanges are the second most used joining method after welding. They are used when joints need dismantling. It provides flexibility for maintenance. Flange connects the pipe with various equipment and valves. Breakup flanges are added in the pipeline system if regular maintenance is required during plant operation.
A flanged joint is composed of three components; flanges, gaskets, and bolting; which are assembled by pipe fitter. Special controls are required in the selection and application of all these elements to attain a joint, which has acceptable leak tightness.

Standard ANSI: ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48 ,JIS,DIN,BS4504,SABS1123,EN1092-1, UNI,AS2129,GOST-12820

DIN: DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673

B.S: BS4504 , BS4504, BS1560, BS10

Pressure Class 150, Class 300, Class 400, Class 600, Class 900, Class 500, Class 2500 | PN 6, PN 10, PN 16, PN 25, PN40, PN 64 etc.

Size: 15 NB to 750 NB, 1/2-78 inch (DN15-DN2000)

Connection Type: Raised Face, Flat Face, Ring Type Joint, Lap-Joint Face, Large Male-Female, Small Male-Female, Large Tongue & Groove, Small Tongue & Groove.

Carbon Steel: A-350 LF2 LF3, A105

TESTING FACILITIES:
Chemical Analysis
Mechanical Test
Metallography Test
Hydrostatic
Corrosion Test
Ultrasonic Test
Radiography
Miscellaneous Test

CERTIFICATES & APPROVALS:
EIL
IBR

Additional Information
Delivery Time: Ready stock
Packaging Details: Wooden Box

A flange can also be a plate or ring to form a rim at the end of a pipe when fastened to the pipe (for example, a closet flange). A blind flange is a plate for covering or closing the end of a pipe. A flange joint is a connection of pipes, where the connecting pieces have flanges by which the parts are bolted together.

150 lb. Slip-On Plate Flanges

 OD AND DRILLING for  through 24 pipe sizes per ASME/ANSI B16.5-1996 Class 150

 OD AND DRILLING for 30& 36 pipe size per ASME/ANSI B16.1-1989 Class 125

The ANSI B16.5 Class 150 Plate Flanges are meant for both Pipe systems as well as Flanged Fittings. The specification for the ASME B16.5 Plate Flanges covers, dimensions, tolerances, marking, testing, pressure &temperature ratings, materials including methods of designating openings for flanges and flanged fittings in pipe systems. The following points are included:

Plate Flange with pressure rating class designations i.e. class 150, class 300, class 400, class 600, class 900, and class 1500 in a size range between NPS 1/2 up to NPS 24 & Alloy Steel Plate Flanges with pressure rating class designation class 2500 is available in sizes NPS 1/2 till NPS 12.

The requirements of the ASME B16.5 Plate Flange has been given in both metric as well as the U.S. Customary units with diameter of bolts and Plate Flange Dimensions bolt holes expressed in inch units;

Flanged fittings with rating class designation class 400, class 600, class 900, and class 1500 in sizes NPS 1/2 through NPS 24 and ANSI B16.5 Plate Flanges fittings with rating class designation with Stainless Steel Plate Flanges class 2500 in sizes NPS 1/2 up until NPS 12. These have been acknowledged in the specification in Non-Mandatory Appendix E section of the Flat Faced Plate Flanges in which only U.S. Customary units are provided.

ASME B16.5 Plate Flange has been limited to flanges and flanged fittings made from materials such as cast or forged materials. While blind flanges and certain reducing flanges could be manufactured from other metals such as cast, forged, or plate materials are exported by plate flange manufacturers. Also included in this Standard are requirements and recommendations regarding the ASME B16.5 Plate Flange for bolting, flange gaskets, as well as flange joints.

This Standard is to be used by ASME B16.5 Plate Flange manufacturers in conjunction with equipments that have been mentioned in other volumes of the Standards in ASME B16 Series as well as with other ASME standards. Therefore, the ASTM A182 SS Plate Flange could be used for both the Boiler and Pressure Vessel Code as well as the B31 Piping Codes.