How do I fix my flange on my face?
How can corroded flanges be repaired?
- Removing the corroded flange and welding a new one.
- On-site machining of the sealing face or ring groove within the flange tolerance.
- Add material (Weld buttering runs) and site machining of the sealing face or ring groove.
Can you bolt a flat face flange to a raised face flange?
Flat face flanges are never to be bolted to a raised face flange. ASME B31. 1 says that when connecting flat face cast iron flanges to carbon steel flanges, the raised face on the carbon steel flange must be removed, and that a full face gasket is required.
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.
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.
What is flange leakage?
Flange leakage is a serious problem in the Piping Industry. Basically, Flange Leakage is a function of the relative stiffnesses of the flange, gasket, and bolting. Flanges are designed to remain leak-free under hydrostatic test pressure when cold and under operating pressure when hot.
Why use flat face flanges?
The purpose of the FF flange is to avoid the bending moment that is put on the flange as the bolts are torqued. Some flange materials can easily break at this time, such as cast iron and fiberglass. Generally speaking, flat face flanges are used in less arduous applications, like low-pressure water piping.
How many types of face flanges are there?
The 6 available types of flange face are flat (FF), raised (RF), ring joint (RTJ), lap joint, male and female (M&F), tongue and groove (T&G). Flanges with different faces require different gaskets and shall never be mated to prevent leakage of the joint.
Can you reuse RTJ gaskets?
Ring joint gaskets are designed to have a limited amount of positive interference, which ensures that the ring type joint seats correctly into the groove on compression. Their reuse is not recommended for two reasons: The initial seating of the gasket will be impaired.
What is the purpose of a raised face flange?
Raised Face and Flat Face The raised face is intended to decrease the surface area of the seal, thus concentrating the surface pressure applied when mating the flange. The result is a stronger seal. The raised face has a machined serrated finish that will bite into the gasket whenever pressure is applied.
What is a ring type joint ( RTJ ) flange?
Ring Type Joint Flange from different viewpoints. The Ring Type Joint or RTJ refers to the type of Gasket required for the Flange. The Ring Type Joint was designed for the Petroleum and Petrochemical industries where higher pressures and temperatures are present.
What should I do if my flange face is damaged?
When a flange face is damaged it is no longer sealable by a gasket and should be either replaced or repaired. In general, there are four basic types of repair to consider Removing the corroded flange and welding a new one On-site machining of the sealing face or ring groove within the flange tolerance
Why does my RTJ sealer have a raised face?
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. For RTJ flanges that seal with ring gaskets, the raised faces of the connected and tightened flanges may contact each other.
Where are the grooves on a ASME B16.5 RTJ flange?
The RTJ facing shall be additional to the minimum flange thickness. The bottom of the ring joint groove shall be in the same plane as the flange edge of a full thickness flange. The ring joint grooves for ASME B16.5 flanges cover a series of groove number ranging from 11 to 79. Since the use of RTJ flanges requires the use of ring joint gaskets.