Pipe Stress Analysis Where Do I Start?
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1 Pipe Stress Analysis Where Do I Start? This is a step-by-step logic guideline for the data collection effort that should occur prior to beginning to model a piping system for a stress analysis: TRIFLEX WINDOWS Training Presentation
2 Why do Pipe Stress Analysis? To ensure the piping is well supported and does not sag or deflect under its own weight To control deflections when loads are applied To ensure that loads and moments on equipment is within the allowables of equipment nozzles To meet ASME requirements and comply with legislation TRIFLEX WINDOWS
3 Why do Pipe Stress Analysis? Pipe stress analysis is concerned with the prevention of overstressing pipes, skids, vessels, flanges, bolting, gaskets, valves, relief devices, fittings, hangers and supports Stress analysis typically considers a case load of Thermal + Pressure + Weight, Thermal Effect, and Pressure + Weight It can also consider Seismic Loads, Wind Loads, Soil Loading, Wave Loading, and Uniform Loading, and a combination of Statics & Dynamic analysis
4 Step 1: What do you wish to achieve? a. Calculate stresses in a piping system and compare them with code allowables b. Evaluate the loads on rotating equipment nozzles and casing c. Evaluate the loads on nozzles on heat exchangers, pressure vessels or tanks d. Evaluate the loads on structural anchors e. Evaluate the loads on pipe supports f. Evaluate piping movements from thermal expansion or contraction
5 Step 1: What do you wish to achieve? (Cont d) g. Evaluate the effects of wind loads on the piping system and attached equipment h. Evaluate the effects earthquake loads on the piping system and attached equipment i. Evaluate the effects of wave loads on the piping system and attached equipment j. Evaluate the effects of soil resistance to piping system movements and stresses k. Evaluate the effects of changes in temperature, pressure and weight on flanged connections to identify possible flange leakages
6 Steps 2, 3, & 4: 2. Which Piping Code will govern the design of the piping system? 3. Collect all plan and elevation drawings 4. Obtain or construct an isometric drawing align North arrows TRIFLEX WINDOWS
7 Step 5: Collect the Necessary Physical Properties a. Nominal Pipe Diameter b. Pipe Schedule / Wall Thickness c. Corrosion Allowance d. Specific Gravity of contents e. Insulation Material or Density & Thickness f. Piping Material or density, modulus of elasticity & coefficient of expansion g. Operating Temp, Design Temp, Upset Condition Temp & Base or Ambient Temp h. Operating Pressure, Design Pressure & Upset Condition Pressure
8 Step 5: Collect the Necessary Physical Properties (Cont d) i. Flange Rating & Type j. Valve Rating & Type k. Elbow and/or Bend Radius or Bend Radius Ratio and Fitting Thickness l. Reducer Length, Inlet & Outlet Diameters, Schedule or Wall Thick, Concentric or Eccentric m. Branch Connection Type n. Expansion Joint Properties Translation & Rotational Spring Constants, Length of Bellows, Length of Tie Rods, Pressure Thrust Area o. Structural Member Specifications AISC designation for standard shapes & dimensional info for non-standard shapes TRIFLEX WINDOWS
9 Step 6: For All Anchors, Collect the Following Data: a. Location b. Stiffness or Flexibility c. Movements mostly from thermal growth d. Origin of thermal growth in Anchor TRIFLEX WINDOWS
10 Step 7: For all restraints collect the following data: a. Location of each restraint b. Translational Restraints - the axis of action & 1 directional or double acting c. Limit Stops the axis of action, the plus and minus gaps and stiffness when limit is encountered d. Imposed Movements - the axis of action & the amount of the movement (+/-). e. Imposed Forces - the axis of action, the amount of the force (+/-) & spring constant, if applicable f. Dampers the axis of action g. Frictional Resistance to Movement - the plane on which the friction occurs, the static and dynamic coefficient of friction
11 Step 7: For all restraints collect the following data: h. Existing Spring Hangers - the location, the installed load, the operating load, the spring constant & the minimum and maximum loads of the spring hanger. It is also helpful to know if the spring hanger supports from above or below the pipe i. New Spring Hangers - the location, the number of spring hangers in that location, the percentage load variation allowed and whether a hanger or support is most desired j. Rotational Restraints the location and the axis about which rotation is to be resisted k. Imposed Rotations - the location, the number of degrees of rotation and the direction of rotation l. Imposed Moments the location, the amount of moment and the direction of action TRIFLEX WINDOWS
12 Step 8: Special Effects Special Effects such as Cold Spring: Cut Short - the location, the axes of application, the amount of cold spring & whether Cut Short or Cut Long TRIFLEX WINDOWS
13 Step 9: Special Loading Conditions a. Wind Loading the piping segments where wind is to be applied, the orientation of the wind vector, wind speed or pressure per unit length and shape factor b. Wave Loading the piping segments where wave loading is to be applied, the orientation of the loading vector, the wave loading pressure per unit length and shape factor c. Uniform Loads such as Snow and Ice the piping segments on which the loads are to be applied, the amount of the loading per unit length and the load orientation with regards to W,Y & Z d. Seismic Loads the method to be used to simulate the seismic event (RSA or percentage of gravity) and the magnitude of the seismic event e. Soil Interaction the piping segments on which soil restraints are to be applied, the soil spring constants or the soil properties
14 Steps 10 & 11: 10. Orient the Global (X,Y,Z) Axis System on the Isometric Drawing Y is always Up 11. Now, assign Node Numbers to the piping isometric drawing in accordance with the guidelines set forth in the next presentation TRIFLEX WINDOWS
15 Pipe Stress Analysis Where Do I Start? For more details please contact: 6219 Brittmoore Road Houston, Texas U.S.A. Voice: Fax: info@pipingsolutions.com
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