Flanges

WELDING NECK FLANGE

This group of flanges is designed with a hub on the backside tapering to a diameter that will match the pipe to which it will be welded. The lighter the pipe is, the larger the bore, conversely, the heavier the pipe, the small the bore. 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 radiographer for flaw detection.

 

 

 

 

 
LAP JOINT FLANGE

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. These flanges are used in applications where the joint must be frequently disassembled for cleaning or where there is a need to facilitate bolt alignment.

 

 

 

 

 

SOCKET WELDING FLANGE

This flange is similar to slip-on flange, except they a bore and a counter bore. The counter bore is slightly 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 ID of matching pipe. The flange is then attached to the pipe by a fillet weld at the hub. The shoulder made by the difference between the bore and counter bore is the same width as the wall of the pipe, thereby providing for an unrestricted flow of product through the connection. These flanges were initially developed for use in small diameter, high- pressure lines. Internally welded socket type flanges are typically used in chemical processes, hydraulic lines and steam distribution lines.

 

 

 
SLIP-ON FLANGE

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 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, non-cyclic applications. They are also used in applications where welding is hazardous.

 
 

 

 
BLIND FLANGES

These flanges are manufactured without a bore and used as closures or seals for the ends of piping systems. They are also used to provide access covers for pressure vessels. Blind flanges are provided with or without a hub, depending on customer requirements. Under pressure and bolt loading, the blind flange is subjected to more stresses than any other flange type. However, the maximum stresses are bending stresses at the center and are easily absorbed by the flange.
 

 

 
ORIFICE FLANGES

Designed for flow metering systems. Two of these flanges with bolts and jack screws are called an "orifice flange union" and are used in conjunction with an "orifice plate." The orifice plate is a separate commodity and is not sold as a part of the flange assembly. Each flange is provided with a pair of pressure taps for measurement of pressure drop in the flow through the orifice plate. The taps are precisely located with respect to the orifice plate. Orifice flanges may be provided in one of three types of flanges: Welding Neck, Slip-On and Threaded.

 

 

 

 
PLATE FLANGES

Plate flanges are a widely accepted and cost effective alternative to forged or cast flanges in low pressure applications. Over the years, a number of standards have been applied to the production of steel plate flanges.

Our plate flange product line includes standard and non standard flanges from 31/2" to 200" in diameter produced to all applicable standards.

 

 

 

 

Flange Material

Flange Specification

1. Carbon steel (ASTM A105)

2. Stainless Steel

3. Alloy Steel

4. Duplex Steel

5. Super Duplex Steel

6. Galvanized Steel

7. Low Temperature Carbon Steel

8. High Yield Sustenite

9. Others as specified by customer

1. ASTM

2. ASME

3. JIS

4. MSS

5. API

6. DIN

7. British

8. ISS

9. Many other specifications and also as per customerís drawing and specification

 

 

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