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  1. rakuday

    Anti surge system for fixed speed compressors

    Rotaryworld, When centrifugal compressors are started, there will be very minimal flow at the inlet. It is not possible for the machine to surge for these low flows. Once the machine reaches 100% speed, the IGV or inlet valve will be gradually opened. When the machine is built and tested for...
  2. rakuday

    ASME VIII Devision 1 or 2

    Simply put, div-1 is design by rule and div-2 is design by analysis. There are several other factors that differentaite the two, but this is one of the major difference. The below link should be useful for a quick understanding between the two divisions...
  3. rakuday

    3D Printer Face Off: Stratasys v. Objet v. 3D Systems v. EnvisionTec

    BraveFellow, Since these are layered techniques, they will not be very good in holding water / fluids for a long duration. For such applications the RP parts are painted, which is a common practice. Secondly these parts might not withstand temperatures of your requirement. For transparent...
  4. rakuday

    Mechanical engineers Market: good rotating VS good static equipment engineers

    Usually, it is a bit easier to find rotating equipment engineers in the service field than in design. One reason is there are very limited number of engineers working on hard-core design & engineering. For example, there are only a handful of experts in specific areas of design of these...
  5. rakuday

    Social Media

    I do not link with strangers, but I search for old friends and re-establish the contacts with them, that way LI has really helped me. Getting back to the original question, about the recommendations, I truly don’t believe in them. One can get high recommendations from friends and that might...
  6. rakuday

    Capacity Control Methods

    IGV's reduces the power consumption of the compressor. As already mentioned by jbattershell, the selection will depend on the initial investment and you can reap its benefit in the reduced operating costs of the compressor during its lifetime.
  7. rakuday

    Forced draft vs Induced draft

    One reason for using induced draft fans in cooling towers are, water will be falling down from the fill and will be collected in the sump at the bottom. Fans cannot be fixed in the bottom of the fill, as it increases the complexity of construction. Whereas for heat exchangers, the fluid being...
  8. rakuday

    Stainless steel from China or India - ASME BPVC Section II or VIII

    komposites, metengr has replied to all your queries. I would like to state that there are numerous companies in China & India who manufacture pressure vessels, heat exchangers and boilers, certify them as per ASME, PED and other different countries codes. Many such companies export & commission...
  9. rakuday

    Air Cooled Centrifugal vs. Air Rotary Screw compressors

    A centrifugal for 1000 cfm? Are you referring to the integrally geared compressors? The centrifugals for low capacity ranges will not be very econimical. Check the motor rating and energy costs, before proceeding further. As an alternate you can check for direct driven centrifugal compressor...
  10. rakuday

    Air Cooled Centrifugal vs. Air Rotary Screw compressors

    Nickpa, Your compressor will work, but what is the performance you are achieving during those ambient conditions matter a lot. Centrifugal compressors performances depend a lot on the operating conditions. To add to zdas reply, if the "operating envelope" is well defined during the compressor...
  11. rakuday

    Tube bundle extracting

    Since these are large bundles, you might want to involve some professional bundle extractors. Below are a few links of some tube bundle extractors. These should give you an idea of how to handle the equipments. You can google for tube bundle extractors and find a suitable service provider in...
  12. rakuday

    Calculation of expanded tube and tubesheet joint according to ASME VIII div 1 Appendix A

    Dragan12, Refer TEMA standard for grooves in the tubesheet for tube-tubesheet joints. In Section-5, depending on TEMA class (R, C & B), the grooving details are mentioned.
  13. rakuday

    Tube bundle extracting

    ikarga, What is the type and size of your HX? Size does matter while assembling and dis-assembling the cooler bundles.
  14. rakuday

    CFM vs SCFM

    zdas04, The point I was trying to make was that these terminologies are used in the larger applications and industries. For areas such as the current problem, there will not be a significant difference between the ACFM and SCFM.
  15. rakuday

    CFM vs SCFM

    AHayden, What are the pressure and temperature you have considered to calculate SCFM? As told by zdas04 & dgallup there is a lot of confusion over what is the standard temp and pr. In your application if there are no big difference between the actual condition and "your defined standard"...
  16. rakuday

    comparision of heat exchanger design softwares

    chem1357, What is your application and what type of HX's are being used? As stated by rmw, these softwares are good in specific type of heat exchangers. I have used HTRI and its very good for S&T, both rating and design. The software also supports different types of fin configurations which...
  17. rakuday

    Compressor Selection and Sizing

    Nickpa, For your requirement of 925cfm, you have three compressors, thats almost three times of your requirement...!!! Are there any plans of future expansion in your company that you are unaware of? These are capital equipments and no one would simply buy compressors and keep it as backups...
  18. rakuday

    Compressor Capacity Questions

    One reason for specifying the compressor by inlet CFM, is because, most of the appications are specified by CFM. For instance, air tools are specified by the air consumption, given in terms of CFM (ex: 3cfm @ 90 psi). It becomes easy to draw the final air consumption for all the applications...
  19. rakuday

    Seal Strips for Long'l Baffles in Shell-and-Tube Heat Exchangers

    sorry, read the material as NBR
  20. rakuday

    Seal Strips for Long'l Baffles in Shell-and-Tube Heat Exchangers

    Tomtation, Any specific reason for using a CS sealing strip? You could use Y seals made of silicon rubber or EBR. They are more flexible and it seals from both the sides of the bundle.

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