What is a phonographic finish?
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 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 AARH?
AARH stands for Arithmetic Average Roughness Height. It is used to measure the roughness (rather smoothness) of surfaces. 125 AARH means 125 micro inches will be the average height of the ups and downs of the surface.
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.
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 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 the aarh value for cold water finish?
The AARH value for these gaskets ranges between Ra 125 µinch to 250 µinch (3.2 µm to 6.3 µm). The cold water finishes appear shiny to the naked eye and are very smooth. The AARH value for these flange surfaces is 85 µinch to 100 µinch. They are used with metal to metal contact.
What does aarh stand for in flange finish?
You may have probably seen this comment: Machining of gasket faces of flanges to a smooth finish of Ra = 3.2 – 6.3 micrometer (= 125 – 250 microinches AARH) AARH stands for Arithmetic Average Roughness Height. It is used to measure the roughness (rather smoothness)…
When to use the RA surface roughness chart?
The Ra surface finish chart is also one of the most used for absolute values. However, it is not always completely enough to define surface roughness. That’s why there are other parameters used. This roughness parameter is best used for anomalies such as burrs and scratches. These may not be obvious with the Ra surface finish chart though.
What does 125 aarh stand for In geometry?
AARH stands for Arithmetic Average Roughness Height. It is used to measure the roughness (rather smoothness) of surfaces. 125 AARH means 125 micro inches will be the average height of the ups and downs of the surface. 63 AARH is specified for Ring Type Joints.