Why does my face flange serration?

Why does my face flange serration?

A serrated finish, either concentric or spiral, is required with 30 to 55 grooves per inch and a resultant roughness between 125 and 500 micro inches. This allows for various grades of surface finish to be made available by flange manufactures for the gasket contact surface of metal flanges.

What is flange face finish?

The facing finish or face finish of a pipe flange manufactured in accordance with ASME B16. 5 refers to the smoothness or roughness of the facing surface. In a bolted flange joint, the flange face is in direct contact with the gasket.

How do you measure your face flange roughness?

The roughness of a flange face is measured by the Roughness Average (Ra). Units of Ra are micro inches (µin), or micrometres (µm). Roughness is calculated using the Arithmetic Average Roughness Height (AARH), or Root Mean Square (rms) calculations.

Which gasket is preferred for serrated finish flange finds its use?

This machining is known as a serration. Flange face can be smooth or serrated type. Which type of face to use is depends on the type of the gasket and service of the fluid. Smooth finish is used with metallic gasket whereas serrated finish is used with non-metallic gasket.

What is serration process?

Serration is a saw-like appearance or a row of sharp or tooth-like projections. A serrated cutting edge has many small points of contact with the material being cut. For example, the teeth on a saw or other serrated blade serves a similar cutting or scraping purpose as the serration of an animal tooth.

What is a phonograph finish?

The Phonographic Finish is actually a serrated finish, either concentric or spiral (much like the grooves on a record), that will grip the gasket between pipe sections firmly. …

What is stock finish flange?

1. The Stock Flange Finish. The Stock Flange Finish is a continuous groove produced by using a 1/16” radius round nosed tool with a feed of 1/32” per revolution. This is the Standard Flange Finish unless otherwise specified by the purchaser.

What is slip on flange?

Slip on flanges are a popular type of pipe flange designed to accept pipe into the bore/center of the flange for welding around both the Outer Diameter (OD) of the pipe and on the interior side of the connection. This flange type is extremely common in lower pressure applications.

What does RTJ flange mean?

Ring-Type Joint
The Ring Type Joint flanges are typically used in high pressure (Class 600 and higher rating) and/or high temperature services above 800°F (427°C). An RTJ flange may have a raised face with a ring groove machined into it. This raised face does not serve as any part of the sealing means.

What is RTJ gasket?

Ring type joint gasket (RTJ Gasket) is a high integrity sealing gasket, high temperature and high pressure gasket for applications in petroleum industry, oilfield drilling, pressure vessels joints, pipes and valves etc from Goodrich Gasket Pvt. Ltd.

When would you use a serrated flange?

Serrated tooth nuts work well for oversized or irregularly shaped holes, since the flange covers any discrepancies and serrations cover the entire bearing surface.