Threaded Flanges Manufacturer, Supplier, and Exporter in India

Threaded Flanges Specification, Grades, and Material

About Threaded Flanges

Threaded flanges are connecting with pipes without welding. It is the same to slip on flanges or socket weld flanges, fitted with a tapered thread (screw) inside the flange bore that is mounted on the pipe with corresponding external threads. In other cases, a seal weld additionally applied in conjunction with threaded pipe flanges.
Though threaded pipe flange is available in different dimensions, threaded fittings mostly use in small diameters pipeline. (Below 4 inches normally.)
It’s not compatible with a pipe system in thin wall thickness, since there’s no space for doing the threading.

Threaded Flange Types

There are two types of threaded flanges. One is to seal the 2 pipe ends with a certain sealing surface and a lens pad. This type of flanges is mostly used for ammonia production. But it has been useless recently, and the lens pad has been replaced by a metal ring. Threaded Flanges Manufacturer and Supplier are available all over the world.
Another type is the same as a normal flange, sealed with 2 flange sealing faces.
Facing Types
There are 2 facing types for threaded flange, ring joint flange, and raised face flange.
Raised Face Threaded Flange
When the gasket surface area is above the bolted line of the flange, the raised face flange is easily identified. It is compatible with a wide range of gaskets, from flat to semi-metallic and metallic types, either ring or full.
The main scope of a raised face flange design is to concentrate the pressure of the 2 mating flanges on a small surface and increase the strength of the seal.
The height of the raised face surface depends on the flange pressure level, for example, for pressure classes 150 and 300, the height is 1.6 mm or 1/12 inch, and for the 400 to 2500 level, the raised face height is about 6.4 mm, or 1/4 inch.
RTJ Threaded Flange
The Ring Joint Flange has a circular groove to accommodate the ring joint gasket, which can be used when metal to metal seals are required. Especially in conditions for high pressure and high temperature.
Referred Standard and Grades
ASTM A105: Standard forged carbon steel pipes components for environmental and high temperature / high-pressure systems.
ASTM A182: The standard for alloy and stainless threaded flanges. Common Stainless steel grades: F304, 304/, F316, F316L, alloy grades: F5, F9, F11, F22, F91.
Convenient Installation and Maintenance
The threaded flange is screwed to the threaded pipe by the thread, which is processed in the inner hole of the flange. So It does not need to be welded. Therefore, it became so convenient for installation and maintenance compared with other flange types, such as slip on flange, socket weld flange, etc.
Application in Special Circumstance
Threaded flanges are used where it is difficult to weld or cannot be welded, such as threaded flange used to protect the galvanized layer of pipe. In addition, It should not be utilized on pipes with repeated temperature fluctuations or above 260 ℃ and below -45℃ as well.
In ASME B31.3 standard it defines:
Where steel pipe is threaded and used for steam service above 250 psi or for water service above 100 psi with water temperatures above 220° F, the pipe shall be seamless and have a thickness at least equal to schedule 80 of ASME B36.10.
Measurement
If threaded pipe flange can be measured accurately, the following data shall be required:
O: Outside Diameter of flange
C: Thickness of flange
R: Diameter of raised face
X: Hub Diameter at base
Y: Length through the hub
T: Minimum thread length
Q: Minimum diameter of the bolt circle