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  • Users: denniskb
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  1. denniskb

    Integration

    How do I enter the following into an integration calculator to solve for s? Sum(n= 0 to infinity, s^2/(n^2-s^2)) when the sum value has a known value (i.e. sum() = 0.40348) Dennis Kirk Engineering www.ozemail.com.au/~denniskb
  2. denniskb

    High Velocity Air Flow in a Tube

    I need to determine the flow of dry air to atmosphere through a small tube so we can correctly set up a series of tests. The aim is to achieve near sonic velocity (say M = 0.9) at the discharge by setting an appropriate upstream pressure. Software available to me will not cope so I am using...
  3. denniskb

    Pipeline Blowdown Thermodynamics

    Wow I just came across thread124-202829. I'm not sure if I am glad I missed it or not but I wish to add to the subject and tie in an earlier posting of mine regarding why JT cooling is used in long compressible pipeline flow calculations "JT or not JT". I take the approach of dividing a problem...
  4. denniskb

    Piping Vibration Software

    I have a client with sometimes severe piping vibration problems at a number of gas pipeline compressor stations and need some advice re suitable software to use. I want to be able to model various beam configurations with combinations of lumped mass and spring restraints at various locations and...
  5. denniskb

    EN 13480 Piping Materials

    I am working in Australia to design a mining processing plant to be built in eastern Europe with piping to EN 13480 and need some guidance as below; 1. What pipe/tube ODs are most commonly used and readily available for this work in Europe? 2. What pipe/tube wall thicknesses are most commonly...
  6. denniskb

    Do You Use Orifice Plates to Restrict Gas Flow?

    Follow the link below to find out more. thread378-164311 Dennis Kirk Engineering www.ozemail.com.au/~denniskb
  7. denniskb

    Do You Use Orifice Plates to Restrict Gas Flow?

    If you use orifice plates as restriction orifices for compressible fluids and need to know the flow rate then you are probably calculating it incorrectly. Surprisingly there is no readily available method to calculate the flow once the critical pressure ratio is exceeded and orifice plates do...
  8. denniskb

    Flange Bolt and Nut Material Selection

    Can someone advise where I will find recommendations on the correct bolt and nut materials for ASME B16.5 flanges? Dennis Kirk Engineering www.ozemail.com.au/~denniskb
  9. denniskb

    Gas Pipeline Blowdown Calculations

    Where would I find a comprehensive method for calculating the pressures and temperatures vs time resulting from blowdown and pressurising of pipelines and compressor stations? Dennis Kirk Engineering www.ozemail.com.au/~denniskb
  10. denniskb

    Gas Pipeline and Compressor Station Blowdown

    Where would I find a comprehensive method for calculating the pressures and temperatures vs time resulting from blowdown and pressurising of pipelines and compressor stations? Dennis Kirk Engineering www.ozemail.com.au/~denniskb
  11. denniskb

    B16.5 Stud vs Nut Material Selection

    For flange bolting B16.5 lists suitable stud and nut materials in Table 1B. Intermediate Strength materials are required to cover our services. We have selected ASTM 320 B8M Cl 2 studs and ASTM 194 8MA S1 heavy hex nuts. Both are Carbide solution treated and strain hardened as suggested by...
  12. denniskb

    Page Number in Cell

    Is there a way to get the page number and number of pages values into Excel cells as functions rather than in the header or footer? Dennis Kirk Engineering www.ozemail.com.au/~denniskb
  13. denniskb

    Optimal Systems Gas/dP Software

    The Optimal Systems website seems to have folded yet it had some of the best technical literature for fluid flows I have seen. Does anyone know if the information is available? Does anyone know if the Gas/dP software is available? Dennis Kirk Engineering www.ozemail.com.au/~denniskb
  14. denniskb

    Stress in GRE Pipe at Support

    I have been trying to determine the local stresses in GRE pipe at the pipe support location and wondered whether COADE may have identified a method to do this. The calculations I have found to date do not fit the typical GRE solution of glueing a 120° to 180° GRE saddle to the pipe at the...
  15. denniskb

    Stress in Pipe at Support

    I would like to be able to calculate the stresses in a GRE laminate pipe where it passes over a pipe support and to design the reinforcing saddle to reduce the stresses to an acceptable level. This is a very important part of successful GRE pipe design but does not seem to be well documented. I...
  16. denniskb

    Pressure Induced Moments on Elbows

    Is there an overall bending moment apllied to an elbow by the internal pressure? If so is there a generally accepted calculation of this moment for different elbow angles? We are doing stress analysis of GRE pipelines where the moment capacity of the elbows can be calculated to ISO 14692 but...
  17. denniskb

    GRE Pipe Strain and Thrust Load

    I am working on an 8" GRE pipeline operating at 1150 psi (7.9 MPa) and trying to determine the growth due to internal pressure and thermal expansion and the forces required to restrain the pipe. The data I have found from different sources conflicts and I would like to find which is correct...
  18. denniskb

    Support Loads from a Pipeline Curve

    I am trying to calculate the support loads resulting from running an above ground pipeline round a large radius curve on guided supports at regular intervals. Pipe is 8 in, curve radius 153 m, curve angle 15 deg and support spacing 8 m. (Note that the pipe is high pressure GRE.) The entry and...
  19. denniskb

    Orifice Plate Critical Pressure Ratio

    Can anyone advise how to determine the Critical Pressure Ratio at which a Square Edge Orifice Plate with compressible fliud reaches critical (sonic) flow and the flows at pressure ratios beyond the critical ratio. I need to correctly predict flowrates through pressurising and blowdown...
  20. denniskb

    ACHE Fin Fan Design Procedure

    I am trying to set up an Excel spreadsheet to do a basic sizing of an ACHE for gas transmission pipeline aftercoolers. I need this so I can select an appropriate design then use the spreadsheet to simulate the selected unit under real operating conditions, not just the original design...

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