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  • Users: DSB123
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  1. DSB123

    Relief Valve Discharge Pipework loads

    Hi All, I have a general question regarding Relief Valves. Does anybody know what limits there are as regards the allowable loading generated from thermal and weight effects (plus seismic) which is allowed on a relief valve from the connected discharge pipework such that the performance...
  2. DSB123

    Nozzle loads on glass flake lined vessels

    Hi All, Anyone out there know of any criteria for the limiting loads on vessel nozzles which have been glass flake lined? My feeling is the limiting criteria should be shell displacement and not stress limits using say WRC approaches or ASME VIII or EN13445. Any thoughts or advice of...
  3. DSB123

    Wind Loading profile

    Hi All, Does anyone know if you can output the wind loading profile (Wind Pressure vs height) from Caesar if the input was to select say EN 1991 wind loading? I just want to check on the calculations within Caesar to ensure the correct wind pressure is being applied.
  4. DSB123

    Ceasar Error Message

    Hi All, Wonder if someone can help me here. I have a Caesar 2016 model that involves USER Defined materials. When I try and run the model I get the following Error message Temperature Fields on element 10 to 20 Expansion coefficients for USER DEFINED materials must be set by the user...
  5. DSB123

    AUTOPIPE QUESTION

    Hi All, I wonder if you can answer a question regarding supports and how Autopipe applies them.I would check this myself but do not have access to Autopipe. Say we have a pipe that has a slope (i.e. it is not exactly horizontal) and it is supported. In Autopipe you specify a vertical...
  6. DSB123

    ASME A335 P11 Pipework - onset of creep

    Hi All, Just wanted to ask for some opinions regarding the temperature at which creep should be considered for A335 P11 pipework. Any comments?
  7. DSB123

    EN 13480 and Weld Strength Reduction Factor

    Hi, We know that high temperatures cause reduction in Strength of Welds compared to the Pipe Material hence the ASME B31.3 Code applying a W Weld strength Reduction factor. However if you look into the EN 13480 Code there is no explicit mention of an equivalent Weld Strength Reduction Factor...
  8. DSB123

    ASME B31.3 "Designer" requirements

    Hi All, I just wanted people's interpretation of the ASME B31.3's competency requirements as regards "Designers". Do we take it that the term "Designer" refers to the Piping Engineer who signs off piping design documents? Does the Checker of the Document need to meet the competency...
  9. DSB123

    Pipe Support Friction Factors

    Just wanted to bring this old one up again. Friction Factors for pipe supports where a pipe shoe sits on steelwork. Nearly everyone uses a friction factor of 0.3 for steel to steel contact. How can this be correct for pipe systems running along pipe racks or outside where we all know that...
  10. DSB123

    Periodic time for empty tank for seismic analysis

    API 650 gives equations for the periodic times for the impulsive and convective components of a liquid filled tank as the tank is not the governing component. However API 650 does not give the equations for an empty tank. Does anyone know where equations may be found for this case. Example outer...
  11. DSB123

    Restraint stiffness

    Hi All, I was just wondering what people think is the best way to introduce a restraint stiffness value into an ANSYS structural model. Say we have a structure that is modelled as being fixed in the X and Z directions translationally at certain locations. However on closer...
  12. DSB123

    Trunnion Checks using Kellogg "Choking" method

    Hi All, Just wanted to solicit views regarding the use of the "Kellogg" Trunnion check that is used widely. As I see it the method is applicable to "trunnions" which are attached to pipe (or bends) where they are remotely positioned (i.e. straight pipe either side of the trunnion or bend...
  13. DSB123

    Closed Thread - 378-220232

    Hi All, Just thought I would warn members regarding the above thread. Within the thread there is an attachment example provided by L S Thill for Trunnion Checks. Please take care if you adopt the formulae on this spreadsheet as it is erroneous. The example gives a total Combined stress of...
  14. DSB123

    Relief Valve Reaction Forces - Open and Closed Systems

    Hi All, Just wanted to solicit some responses to the old subject of Relief Valve Reaction Forces. Over the years I have worked at Companies who use the standard Formula from API 520 for calculating the reaction force when a RV opens. However they tend to neglect the second Pressure times...
  15. DSB123

    How to model plate sat on beams

    Hi All, Newbie to STAAD. If I have a sqare of four beams modelled which has a plate sat on the top of the beams how do I model the plate sat on the beams?
  16. DSB123

    Pipe Thickness to ASME B31.1-2007

    The ASME B31.1 Code provides equations to determine the required thickness tm for straight pipe (i.e. Eqn 3 Para 102)which includes any allowances for corrosion etc. Table 102.4.5 states that the minimum thickness of straight pipe prior to bending is some factor mutiplied by tm (the multiplier...
  17. DSB123

    Moment and force ranges

    Hi, A newbie at Caesar. Can anyone advise if you can obtain an output of the force and moment "ranges" for elements which have been used in the calculation of the thermal stress range
  18. DSB123

    SS Pipe to SS Support Steel

    Hi All, I just wanted to solicit views from the group regarding the supporting of SS Pipe directly onto SS supporting steelwork. Pipework is subject to temperature variation (low) and seismic loads. Any concerns by anyone? Regards DSB123
  19. DSB123

    Old Pipe Spec

    Hello Members, Would like your responses to the following:- Consider an existing Pipe Spec for a plant which was developed in 1992 to cover A335 P11 pipework to ASME B31.1 The selected pipe schedules were Sched 120 which were determined to be acceptable for the design conditions...
  20. DSB123

    Convergence Problem

    Hi There Experts, New to Ansys. Trying to get a contact problem to solve but it keeps kicking out after a time with no solution. Using Conta170 and Targe174 elements. Any ideas of what I need to do to get convergence? Regards

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