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It could be light weight welding positioner which operates manually.

I think that you need to compromise the eccentricity with the structural engineer on the member sizes and additional torsional capacity. Sometimes you may take torsion at the source by adding member with adequate connection. I would write a spreadsheet or use the software for adequate...

Diaphragm pumps will always produce pulses and vibration. Therefore you need to use pulsation absorber/accumulator to eliminate the pulsation effect. Perhaps the pump supplier can recommend/provide an accumulator. Pulsation flow may/will cause problem in the flow path in case you do not...

Just be careful with hot tap application. Almost all the hot top equipment may not be allowing the piping to work at all operating conditions, they have limitations. You need to check with them/their catalogue/brochures.

Normally, the design shall follow the design specification for the PV design. Most cases the lifting/lifting attachment are considered for the thin wall vessels. Saddles are designed for the design loads which includes full/operating weights, wind/seismic loads, pressure, temperature only...

I guess you can ask anything that can be manufactured, and you need to pay the price. For uncommon dimensions you/manufacturer needs special equipment for the forming process. This will increase the cost a lot. The common ellipsoidal head is 2:1, and almost all the elliptical head manufacturers...

As long as the pump is selected for the max water level there should not be any problem. Additionally the inlet flow should not cause turbulence or dynamic action against tank internals or the tank itself. How about the discharge? Will the discharge and inlet be operating at the same time? If...

In case the the specification of plate heat exchanger was not passed on the vendor or the contract was finalised you have a chance to talk to project manager to be able to get the heat exchanger with the load requirements given in the Table 2. If you cannot do thing above you need a very large...

The system is structurally indetermined and it is not a mechanism either. The cable connection makes everything more complex. Eventough the cable may be replaced by another linkage, it is the same unless it has a moment connection on unlinked side (rotating motion). However this may cause the...

GD2 is correct in his statement. However it becomes a special flange, you cannot call it standard flange in the drawing any more. Think about replacement. Another way might be the required wall thickness calculation to the code, and add the CA.

This drawing explains better. In this configuration I would extend the external partial stiffeners to 150 degrees, (as it is, it looks like 120 degrees) for hand calculations only to take the weight loads to side walls on shell. This will reduce bending stress in the stiffener edge and shell...

BZ29, Can you please provide the locations of connections of the internals? In case internals are attached lower section of the vessel and the weight distribution is uniform so the intermediate saddles are for the support of internal weight. You need to go through the drawings to confirm the...

In case a pump suction is connected to the vessel and there is not sufficient opening to eliminate the suction you may have partial or full vacuum in the vessel. Have you looked at it this way? In case there is vacuum you may need to use ASME VIII Section 1 or similar codes. Other than above...

The short answer for those temperatures is creep and elongation.

Why do not look at Timeshenko's book, Plates an Shells or Roark's book Stress and Strain. They have calculation methods for circular plates with inner holes under several loads cases. You may be able to combine load cases and find combined stresses and deflections. If you consider outer edge is...

Structure_engineer, I agree with you. However, all the clients are not the same. Some of them are with lack of knowledge. Whatever comes from piping engineer, they pass on other parties without even looking at it.In my previous works I used to prepare a spreadsheet for the purpose, mostly with...

Structure_engineer, You have provided the evidence of the factor of 0.6. This factor is used for checking the pipeline under stress limit state. The others (ultimate limit state factors)are used for designing structure and foundation using ultimate state design, and controlling deflection. I...

Good practice is not to use flange connection underground. You should be able to use threaded connection instead. In case if you must use one only connection underground, the best is to organise a dedicated room for this connection with suitable materials.

0.6 could be the shape factor for the circular pipe under wind load in case the wind load is produced for the diameter of the pipe only. You need to investigate how the wind load was driven to be able to prove this is true.

And, nozzle and support saddle distribution should also be considered for the strake lengths. None likes weld intersecting nozzles and reinforcement pads. Supporting saddles should be kept out of circumferential and horizontal welds.