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Hi, The client has asked for a thermal bowing analysis for a thin walled insulated steam line. The client wants to investigate if thermal bowing occurs and if it is occurs what stress are developed in the pipe when the line is warmed up during the winter time, when the ambient temperatures can...

Corus, Thank you for your suggestions. If I use the symmetry plane (XY for example), the only constraint applied on the cut plane is Tz=0. One free end of the pipe (left end), is constrained only axially (Tx=0). I did not understand how to constrain the other free end (right end)? What does it...

rb1957 (Aerospace), I think I did not quite understand your suggestions. So, how many nodes I need to constraint ? Where these nodes have to be selected ? On face A of the pipe, on face B of the pipe or on both faces (A&B)? What does it mean "1) x constraint on every node on face x = 0" ? What...

rb1957 (Aerospace), I have run the structural analysis with the constraints as you suggested. Please see my previous post. I have got unrealitic displacement results in order of 187 inches magnitude. Attached here is a print screen of the displacement results. According to your suggestion (one...

rb1957 (Aerospace), You said:" i'd fully constrained the face axially (x?) and constrained one node in y and z and another (diametrically opposite) in z." and also " for this you need 3 (only) constraints ... 1 in y- and z- to react the forces and another in either y- or z- placed to react Mz...

TERIO, One pipe is 12 inch (thickness 2.4375 inch), and the other pipe is 18 inch (thickness 3.7 inch). As I have mentioned before, I am analysing now only a stright section of the pipes (500 mm) to investigate the distribution of the stresses in the pipe walls. The full model will include two...

rb1957, In my previous analysis one of the physical properties(Young Modulus of Elasticity) was wrongly defined. It was 28 lbf/in^2 instead of 28*10^6 lbs/in^2. I have corrected that input and I have changed a bit the restraints. I have constrained 6 nodes on one end of the model for Tx=0, Ty=0...

EngAddict, I have defined a cylindrical coordinate system. I then assigned the local coordinate system to nodes at one end of the model. I have applied nodal constraints (Tx =0, Ty=0, Tz=0) to prevent the rigid body motion of the model. I am not sure though if these constraints are properly...

Hi EngAddict, What does it mean "select three points, one in each direction.."? What does it mean " If you are after restrained free end expansion.."? When I apply the restraints, is it better to select surfaces or nodes? Regards, One Point

The piping system was analysed with Caesar II software and the pipping code was B31.1.The system is part of a coal fired power plant.

Hi rb1957 , I am not a student. I know that Von Mises Stresses are not related to any direction. Last time I worked on a FEA stress analysis was about 6 years ago. Since then I have been involved only with a few FEA heat transfer analyses and hydraulic analyses in my job. I looking to...

Cheers, Since you have been very helpful & thoughtful answering to my question, I want to ask you a few more "dumb" questions. Why you need to up the model with a cylindrical co-ord system, in order to investigate the hoop and radial stresses? What about Von Mises stress? Is it a cylindrical...

Hi, I have run a structural analysis to investigate the Circumferential, Radial & Axial Stresses in a pipe wall. In the stresses output results, there are listed several types of stresses(Von Mises Stresss, Principal Stresses and Tensor Stresses). Which of these do I need to look for in order...

Hi, I have run a structural analysis to investigate the Circumferential, Radial & Axial Stresses in a pipe wall. In the stresses output results, there are listed several types of stresses(Von Mises Stresss, Principal Stresses and Tensor Stresses). Which of these do I need to look for in order...

Hi, I have run a structural analysis to investigate the Circumferential, Radial & Axial Stresses in a pipe wall. In the stresses output results, there are listed several types of stresses(Von Mises Stresss, Principal Stresses and Tensor Stresses). Which of these do I need to look for in order...

Hi, The aim of this FEA is to investigate thermal stresses caused only by the temperature gradients through pipe wall thickness. The overal thermal expansion of the system has been analysed by a piping stress analysis(Caesar II). I have run the transient heat transfer FEA model for the...

Insulated main steam lines running from boiler stop valves to turbine main stop valves. The lines are 18 inches and 12 inches with 8 inch and 7.5 inch insulation thickness. The ambient temperature where this steam lines are installed is about 70F. Steam lines are warmed up during thecold start...

Insulated main steam lines running from boiler stop valves to turbine main stop valves. The lines are 18 inches and 12 inches with 8 inch and 7.5 inch insulation thickness. The ambient temperature where this steam lines are installed is about 70F. Steam lines are warmed up during thecold start...

Insulated main steam lines running from boiler stop valves to turbine main stop valves. The lines are 18 inches and 12 inches with 8 inch and 7.5 inch insulation thickness. The ambient temperature where this steam lines are installed is about 70F. Steam lines are warmed up during thecold start...

Hi Corus, Thank you for your response. The piping stress model (Caesar II) has got one end fully fixed (anchor), at the team sturbine end. The other end of the steam lines (boiler end) has 3 translations and one rotation(RZ)assigned as displacements. Now in the FEA model, I am considering to...