Shikhar Steel Corporation

Kumbharwada, Mumbai, Maharashtra

Uses of pipe flanges:

Designs of flanges:Butt weld, Socket weld, Captive, Split, Square, Round, Rectangle etc.Material grades:

Features of blind flanges:Some important features of blind flanges are as follows:

• Blind flanges are sometimes supplied with NPT fittings which allow pressure test connections to be fitted.
• They are used to blank off the ends of pipe.
• They are also used to blank off the ends of valves and pressure vessel opening.
• Considering factors like internal pressure and bolt loading, blind flanges, especially in the larger sizes, are the most highly stressed of all types of flanges.
• Since the maximum stresses in a blind flange are bending stresses at the center, they can safely be allowed to be higher than in other types of flanges
• Blind flanges are made to fit standard pipes in all sizes.

Weld Neck Flanges are fittings used in place of welded flanges where rotating back up flanges are desired. They are also called lap joints and vanstone flared laps. A rotating back up flange seats itself against the back surface of the stub end. When bolts are added, the clamping action of the bolts presses the rotating back up flange against the back of the stub end. The gasket surface of the stub end then presses against a gasket and another gasket surface providing joints like standard flange joints. The seal is made by the gasket surface of the stub end alone, the flange only provides the clamping pressure on the joint. Our high quality Weld Neck Flanges (butt weld fittings) are tested and verified for durability, accuracy and precision. The Weld Neck Flanges are manufactured in all standard dimensions. The Weld Neck Flanges are provided with a standard weld bevel and can be available in squared,  flanged,  Victaulic and threaded ends. We offer Weld Neck Flanges at highly competitive prices.

Specifications

• Material : ASTM A182 F 304 / 304L / 316 / 316L / 317 / 317L / 321 / 309 / 310 / 904 / F1 / F5 / F9 / F11 / F22 ETC. & ALSO IN CS
• Size : 1/2" TO 24"
• Pressure : Sch 5s to Sch Xxs.
• Class : 150#, 300#, 600#, 900#, 1500#, 2500#

• Lap Joint flanges have the freedom to swivel around the pipe. This facilitates the lining up of opposing flange bolt holes.
• Lack of contact with the fluid inside the pipe leads to the greater durability of these flanges.
• In piping systems which corrode or erode quickly, the lap joint flanges may be salvaged for re-use.
• The pressure-holding capacity of lap joint flanges is little. But it is better than that of slip-on flanges.
• The Lap Joint works as a backing ring on the stub.
• The main advantage of lap joint flange is that the bolt holes can be aligned with the matching flange after the welds have been completed.
• They allow rotational alignment capability.

A Slip-On Flange is bored sightly larger than the outer Diameter of the matching pipe. The pipe slip into the flange prior to welding both inside and outside to prevent leaks.The British standard flanges manufactured by us pertain to all standards like BS10 1962 Table D, E, F, H IS 6392 Table 5, 17, 26 IS 1538 in slip. These are manufactured using mild steel both in slip-on and blind type. Our quality slip on flanges are ideal for lower pressure applications. Their ease of fitting and welding reduces fabrication costs. Our professional engineering team is involved in innovating durable and high-quality products to cater to our clients' needs.

Raised face, ring - type, flat face, male - female, tongue - groove.welded both inside and out to provide sufficient strength and prevent leakage.They are ideal for low pressure applications.

• Low cost installation
• Less time needed to spent on ensuring the accuracy of the cut pipe
• They are somewhat easier to align
• The slip-on flanges have low hub because the pipe slips into the flange before welding
• The flange is welded both inside and outside to provide sufficient strength
• They prevent leakage

Socket welding flange, a popular type of pipe flange, was initially developed for use on small-sized high- pressure piping. The fabrication of this type of flange is similar to that of aslip-on flange. However, the internal pocket of a socket weld flange allows for a smooth bore and better fluid flow. When provided with an internal weld, the static strength of this flange is equal to slip-on flange, but the fatigue strength is 50% greater than double welding slip-on flanges. Smooth bore conditions in such a flange can easily be attained without having to bevel the flange face and, after welding, to re-face the socket weld flange as would be required with slip-on flanges. For this reason, the internally welded flange is popular in chemical process piping. The counter bore is sightly larger than the Outer Diameter of the matching pipe, allowing the pipe to be inserted. A restriction is built into the bottom of the bore, which acts as a shoulder for the pipe to rest on, and has the same I.D. of matching pipe. The flow is not restricted in any direction.

Key Features:

The recess on the inside diameter of the socket weld flange allows for a good fit of the pipe allowing for a smooth flow of liquid. Socket welding flanges work well for smaller sizes and higher pressure temperature conditions. They are similar to slip-on flanges, but must specify the schedule of the pipe where they will be used for with socket welds.

Standard facing:

Raised face, ring - type, flat face, male - female, tongue - groove.welded both inside and out to provide sufficient strength and prevent leakage.They are ideal for low pressure applications.

Uses of socket weld flanges:

• They are ideal for small diameter applications.
• They are used for high pressure applications.
• Socket weld flanges have an internal recess on the inside diameter which allow for a smoot flow of the process fluid.
• They create a smooth bore with the proper welding and grinding.

• Reducing flanges are used in pipe-to-pipe connections.
• Reducing flanges are a little easier to bolt up than non-reducing flanges.
• They provide the most perfect solution when you need to connect different size flanges.
• These flanges are available in all types and pressures.
• Reducing flanges are fixed by welding, gluing or clamping flanges of equal dimensions provided with different connecting pieces.
• They offer the simplest and least expensive method of mating two different sized flanges.

• Reducing flanges are used in pipe-to-pipe connections.
• Reducing flanges are a little easier to bolt up than non-reducing flanges.
• They provide the most perfect solution when you need to connect different size flanges.
• These flanges are available in all types and pressures.
• Reducing flanges are fixed by welding, gluing or clamping flanges of equal dimensions provided with different connecting pieces.
• They offer the simplest and least expensive method of mating two different sized flanges.

• Threaded flanges can be fitted to pipes of various sizes without welding and this is one chief benefit for which these flanges are highly demanded.
• They can be used in extremely high pressure applications, particularly at or near atmospheric temperature, where the necessary post weld heat treatment is not possible.
• They are ideal for small diameter piping applications.
• They are economical and time saving devices.
• These threaded flanges are normally designed for non-cyclic applications.
• The flanges are suitable to be used in applications where welding is hazardous.
• They can be used in highly explosive areas.

Separating one part of a line from another requires a spectacle blind, able to switch from closed to open and back again. Bleed rings provide a means to release pressure from the pipe through a controlled opening.

Materials used:
Stainless Steel:ASTM A182 F304/304L, F316/316L, F316H, F316Ti, F321, F44(UNS S31254)
Key Features:

Can be attached to the pipe without welding (sometimes an additional seal weld is used as well) Ideal for higher pressure and temperature applications for small pipe sizesNot recommended for larger loads, especially when subjected to higher torque

• Threaded flanges can be fitted to pipes of various sizes without welding and this is one chief benefit for which these flanges are highly demanded.
• They can be used in extremely high pressure applications, particularly at or near atmospheric temperature, where the necessary post weld heat treatment is not possible.
• They are ideal for small diameter piping applications.
• They are economical and time saving devices.
• These threaded flanges are normally designed for non-cyclic applications.
• The flanges are suitable to be used in applications where welding is hazardous.
• They can be used in highly explosive areas.

The first and most widely used type are spec blinds short for spectacle: these are flanges with two equal outside diameter (OD) parts welded together by way of a bridge. One of the parts also contains an inside diameter (ID), while the other is a blank, or blind. A whole is put at the halfway mark of the bridge. These are also called spectacles, figure 8s, and figure 8 blanks, because of their resemblance to reading glasses (spectacles) and figure 8s. These are referred to as Line Blanks in the ASME/ANSI standards.
The second and third types are quite similar: both have longer bridges, referred to as paddles, which resemble longer handles. One type has only an OD, and so is a blind plate similar in appearance to a large pizza oven peel. These are referred to as paddle blinds. The other type is exactly the same but comes with an ID as well, enabling flow-through when installed in a piping system. These pieces have holes in the paddle which enables field personnel to determine by sight which piece is installed in a system. These are referred to as paddle spacers, and are often supplied in sets together with the paddle blinds.
All 3 types of these flanges are used in piping systems or pressure vessels where the flow needs to be interrupted from time to time. They are installed between two pipe flanges (as specified above), and by way of a screw inserted into the hole in the bridge or paddle, they are able to rotate or swing into and out of position to interrupt or allow the flow, as the user sees fit.

Weld Neck Flanges are drilled(machined) with the wall thickness of the flange having the same dimensions of the matching pipe, the lighter the pipe is, the larger the bore, conversely, the heavier the pipe, the small the bore, they are normally used for highpressure, cold or hot temperature
Notes :

Flange dimensions to ANSI B16.5.
Dimensions "B" & "D" includes raised face thickness.
Bore (SCH) "C" purchasess to Specity.
Larger outlet sizes are avilable on applications.
ANSI 150# / 300# 2mm Raised Face.
ANSI 600# / 2500# 7mm Raised Face.

This is the most common type of high pressure pipe flange. They are distinguished from other types of pipe flanges by their long tapered hub and gentle transition of thickness in the region of the butt weld joining them to the pipe. The long tapered hub provides an important reinforcement of the weld neck flange proper in terms of strength and resistance to dishing.

• The weld neck flange is very resistant to dishing and has a very sturdy connection because it has the pipe along with the tapered hub.
• The flanges are ideal for extreme fluctuations of temperature.
• They are ideal in environments where there may be a lot of bending and handling of the flanges.
• Preferred in an environment with extreme temperature conditions.
• This type of flange is preferred for every severe service conditionresulting from high pressure or from sub-zero or elevated temperature.
• They are used in situations where loading conditions are substantially constant or fluctuate between wide limits.
• This is probably the best welding flange available because of its high, heavy neck.
• Highly recommended wherever a sound welded joint connection is needed.