Spacer Flange w-Phonographic 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 serrated finish?
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 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 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.
What is flange facing?
Flange facing is the process of resurfacing flanges by machining new mating surfaces to ensure a perfect seal when assembled.
What is the serration?
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. Probably the largest serrations on Earth occur on the skylines of mountains (the Spanish word sierra, as in Sierra Nevada, means a saw).
What is serration in flange?
Serration on the Flange Face The flange face has small grooves as you can see in the image. This machining is known as a serration. Flange face can be smooth or serrated type.
What is RF in flange?
Raised Face Flanges (RF) The Raised Face Flange is the most common type used in process plant applications, and can be easily identified. It is referred to as a face raised because the surfaces of the gasket are positioned above the face of the bolting circle.
What is tongue and groove flange?
In the Stainless Steel Tongue & Groove Flange, the Tongue Flange is manufactured with a raised ring that is machined. into its face. The Groove Flange is produced with a matching depression machined onto its face. In order to have a watertight connection, it is. important to match the faces of these flanges.
What is flange face?
The flange face is the surface area that hosts the gasket. Flanges with different faces require different gaskets and shall never be mated to prevent leakage of the joint. RF and FF flanges may have different types of “finish” (i.e. roughness on top the surface): smooth, stock and serrated.
How can flanges be classified based on face finish?
One flange face has an area that extends beyond the normal flange face (Male). The other flange or mating flange has a matching depression (Female) machined into it’s face. The female face is 3/16-inch deep, the male face is1/4-inch high, and both are smooth finished.
How do I get a phonographic finish?
The five simple steps below outline a failsafe way of verifying before you even start that you’ll produce a quality phonographic finish. Step 1: Mount the indicator on the side of the tool holder. As desired, set a high feed rate so you’ll be able to achieve the phonographic finish.
What is a phonographic finish on a pipe?
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 the difference between a concentric serrated and Phonographic finish?
A phonographic finish is more difficult to seal than a concentric serrated finish. Complete flow of gasket material must reach to the bottom of the ‘valley” surface in a phonographic finish to avoid a spiral leak path from one end of the spiral to the outside.
