Join Eng-Tips Forums! Join Us! By joining you are opting in to receive e-mail. Promoting, selling, recruiting, coursework and thesis posting is forbidden. Students Click Here. Related Projects. I have a question, hopefully some expert s may enlighten me on with some remarks. Design temps around C, Spiral wound gasket with inner and outer ring to be used. Design code B I think the Code doesnt 'disallow' this bolted joint, but is there any 'potential for problems' here, say to so?
Perhaps gasket stress seating, unequal stress in the SO flange,.. Thanks pennpiper. I've just found a similar discussion with similar replies in thread No real problems there, however as mentioned by moltenmetal thread , would you maybe worry about the gasket getting torn apart?
Spec the correct gasket and the joint will not be a problem. Otherwise the potential for the unsupported and uncompressed portion of the gasket to fail inward by coming un-wound definitely exists.
RF-to-RF is a standard connection. Just use a regular gasket. I was more concerned on the SO to WN connection. I was 'hoping' for more mechanical answers in that direction. Produced without a bore in the center, the main purpose of using a blrf is to blank off the end of a piping system or valves or even pressure vessel openings. Blind flanges could also be used in conjunction with any other flange to isolate a piping system in the oil and gas industry.
Furthermore, they make an excellent manhole, especially if they perform the task of terminating a flow in the piping system or in a vessel.
These functions in the oil and gas industry dictate that the materials used in the manufacture of blind flanges have high tensile strength and good mechanical as well as corrosion resistance properties. This is especially due to the high pressure and high temperature conditions present in these applications. Recommended to be used for low pressure and low temperature settings, the socket weld has a static strength which is equal to a Slip-on flange. Frequently a Socket-weld connection is made with the pipe by using a fillet weld performed on the outside of the flange.
The Weld Neck Flange provides improved strength at greater pressures, subzero or extreme temperatures, and other variable stresses such as line expansion or retraction. A Slip-On Flanges estimated strength under internal pressure is around two-thirds that of a Weld Neck Flange, and their yield stress is around one-third that of a Weld Neck Flange. Slip-on flanges are a form of flat welding flange. Flat welding is only used to weld the outer layer, not the inner layer.
The nominal pressure of these pipes with Tapped Slip On Flange is less than 2. Class range: Class , Class , , , , , or LB. The purpose for the bottoming clearance in a Socket Weld is usually to reduce the residual stress at the root of the weld that could occur during solidification of the weld metal. The image shows you the X measure for the expansion gap. The disadvantage of this flange is right the gap, that must be made.
By corrosive products, and mainly in stainless steel pipe systems, the crack between pipe and flange can give corrosion problems. In some processes this flange is also not allowed. I am not an expert in this matter, but on the internet, you will find a lot of information about forms of corrosion. Also for this flange counts, that principle always firstly a pipe must be welded and then just a fitting. Socket Weld flange 2.
Filled weld 3. Lap Joint Flanges have all the same common dimensions as any other flange named on this page however it does not have a raised face, they used in conjunction with a "Lap Joint Stub End". These flanges are nearly identical to a Slip On flange with the exception of a radius at the intersection of the flange face and the bore to accommodate the flanged portion of the Stub End.
Their pressure-holding ability is little, if any, better than that of Slip On flanges and the fatigue life for the assembly is only one tenth that of Welding Neck flanges. They may be used at all pressures and are available in a full size range. These flanges slip over the pipe, and are not welded or otherwise fastened to it.
Bolting pressure is transmitted to the gasket by the pressure of the flange against the back of the pipe lap Stub End. Lap Joint flange 2. Stub End 3.
Butt weld 4. This flange connections are applied, in low-pressure and non critical applications, and is a cheap method of flanging. In a stainless steel pipe system, for example, a carbon steel flange can be applied, because they are not come in contact with the product in the pipe. Stub Ends are available in almost all pipe diameters. Threaded Flanges are used for special circumstances with their main advantage being that they can be attached to the pipe without welding.
Sometimes a seal weld is also used in conjunction with the threaded connection.
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