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Pressure part weld

Wednesday, February 02, 2011   By: samcool [1199] 0 Stars
i need your valuable comment


pressure part weld.pdf

Click on picture for full size view or to view PDF!

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Wednesday, February 02, 2011   By: manohar muthusamy [825] 3 Stars
i believe that the diagram you posted refer economizer bank coils. If yes, it is advisible to use ladder support by using simple clamps arrangement without welding any plates with pressure parts. if structural attachment on tube is unavoidable refer ASME section I PW43.

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Wednesday, February 02, 2011   By: N.Ramani [965] 4 Stars
I have the following observation.You should go by the metal temperature not the fluid temperature. Further as suggested by Manoharan if welding is unavoidable then you have to plan the weld design to suit the situation, For example you may have to provide some reliefs in the Lug to avoid stress raisers. Other precautions as per code are to be taken care off.Further more care is needed if the material contains elements like Vanadium which are v critical for welding and the welding is between dissimilar materials.. Please note that it is not uncommon to do such welds. We have done it for 540 Deg metal temperatures and the whole assembly enclosed in insulation. But we try to avoid if possible.Can you tell why you want to weld when the clamps can take the load.

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Wednesday, February 02, 2011   By: N.Ramani [965] 4 Stars
I have the following observation.You should go by the metal temperature not the fluid temperature. Further as suggested by Manoharan if welding is unavoidable then you have to plan the weld design to suit the situation, For example you may have to provide some reliefs in the Lug to avoid stress raisers. Other precautions as per code are to be taken care off.Further more care is needed if the material contains elements like Vanadium which are v critical for welding and the welding is between dissimilar materials.. Please note that it is not uncommon to do such welds. We have done it for 540 Deg metal temperatures and the whole assembly enclosed in insulation. But we try to avoid if possible.Can you tell why you want to weld when the clamps can take the load.

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Thursday, February 03, 2011   By: samcool [1199] 0 Stars
thanx mr.ramani,

actually long clamps carry the total coil load tensile load ,that load is distributed to panel wall through this lug only,i have a little confusion that if lug is not welded to tube even it is welded to clamps to take coil load,there may be any structural disintegerity so that the coil load could not be transferred properly to panel,tats y i think about welding of lug with coil for more integerity and also combined section modulus of coil and lug improves wih this welding,but now i ruled out tat option to avoid unnecessary puncture of coil due to disimilar metal welding,and also of unavoidable thermal stress..

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superheated steam ideal gas
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Mr. Pradeep:

Steam behaves well as an ideal gas if not too close to the saturation line if you place yourself on a Mollier chart, when the temperature and enthalpy lines coincide and are straight, horizontal lines, then it behaves as ideal, and this you can easily see on the chart.

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