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  1. ValveEngineer123

    Pallet Racking and Workbench Design

    Thanks warehousedegn, a very useful link; Also found good information on your company website!
  2. ValveEngineer123

    B16.5, ASTM SA-193 and SA-194

    B16.5 gives guidance as to acceptable bolting materials to be used for flange bolting. In Table 1B, different grades of SA-193 are categorized as either high, intermediate or low strength. In addition, the notes to this table include statements such as 'nuts may be machined from the same...
  3. ValveEngineer123

    Swivel Type Flange (Collar) Nuts

    Does anyone know if collar nuts with a swivel washer are acceptable to use for B16.5 flange bolting applications? I have an application where a blind flange is bolted on and off a mating flange several times per day and the blind flange is starting to wear at the nut bearing surface. I want to...
  4. ValveEngineer123

    Pallet Racking and Workbench Design

    Thanks for the replies. I am not custom designing the racking, nor is it a new installation, otherwise I would expect load capacities to be provided by the manufacturer. Rather this is 20 year old Redi-Rack pallet racking. 20 years ago, there were few regulations governing the installations...
  5. ValveEngineer123

    Pallet Racking and Workbench Design

    I am a mechanical engineer (thermo/fluids, process system, component design) that has been assigned some additional duties. I was wondering if any structural or industrial engineers could point me towards some good resources regarding the following topics: 1) Pallet Rack Design: Specifically...
  6. ValveEngineer123

    Pallet Racking and Workbench Design

    I am a mechanical engineer (thermo/fluids, process system, component design) that has been assigned some additional duties. I was wondering if any structural engineers could point me towards some good resources regarding the following topics: 1) Pallet Rack Design: Specifically interested in...
  7. ValveEngineer123

    Minimum Wall Thickness and Taper Threads

    Thanks RCHandy, I can see that this is the approach that has been typically taken for dealing with taper threads. What I am wondering is: does the code require one to consider the gradual reduction in wall thickness due to the taper itself? If the mating (female) fitting does not engage the...
  8. ValveEngineer123

    Minimum Wall Thickness and Taper Threads

    Section III
  9. ValveEngineer123

    Minimum Wall Thickness and Taper Threads

    The ASME B&PV code gives an eq'n to calculate minimum required pipe wall thickness for given pipe dimensions (OD,ID), design pressure and allowable stress on the pipe material. The eq'n also includes an 'A' factor, which is to account for additional thickness required for, say, material removed...
  10. ValveEngineer123

    Bolt Preload and Sect. VIII - App. 2 Flange Stress

    I have found the yield stress of the studs to be 115ksi, as per sect. II, Pt.D, table 3. 70% of this value gives me a preload stress of 80.5ksi. The studs have UNC threads. The bolt preload requirement was specified by my customer (they have also specified a minimum gasket preload stress of...
  11. ValveEngineer123

    Bolt Preload and Sect. VIII - App. 2 Flange Stress

    SnTMan: Do you mean use the actual gasket width to calculate my actual gasket stress based on the preload? If so, this is what I have done to obtain the 30ksi value. Or are you referring to using the actual gasket width as opposed to 'b' in the bolt load/flange stress calculation? unclesyd...
  12. ValveEngineer123

    Bolt Preload and Sect. VIII - App. 2 Flange Stress

    I am designing a flanged connection to the rules of Sect. VIII - App. 2 (actually Sect.III, App. XI, but its the same procedure). I am using a corrugated stainless steel gasket at the connection, for which app. 2 gives a minimum seating stress of 7600 psi. Using this gasket stress, I calculate...
  13. ValveEngineer123

    Vertically installed control valve

    I2I: Oh, Ok I understand now, you were referring to the orientation of the pipe run as being vertical (and therefore CV shaft horizontal).
  14. ValveEngineer123

    Vertically installed control valve

    flatlander1: Very little difference between throttling and control, I was just using the terms to differentiate between flinana's application where a manual valve is adjusted to provide a set flow rate (or pressure...etc), then locked in that position and left there, and (what I would consider a...
  15. ValveEngineer123

    Vertically installed control valve

    flinana: Since the valve you refer to is manually operated and is used in more of a throttling application than a true control application, it won't make a big difference whether it is installed shaft horizontal or shaft vertical. It is, however, a good idea to check with the manufacturer as...
  16. ValveEngineer123

    Crane Resistance Coefficient (K factor) for Pipe Elbows

    Greenche: Is it possible to just make a conservative assumption for the value of r/d and input that to your spreadsheet? If the answer is favourable then your problem is solved. If not, then look at spending the time to produce some sort of interpolation. Or perhaps you need a more accurate...
  17. ValveEngineer123

    per diem...

    I agree as well, per diem is on top of your regular salary, and its tax free. Per diem should cover your living expenses while you are at the work site plus travel back and forth home on weekends. It really depends on how far away the work location is to determine whether the per diem rate is...
  18. ValveEngineer123

    Cryogenic Globe Valve Flow Direction

    mechconst: With respect to determining the correct flow direction, more information is required. Is this valve in an isolation or control/throttling application? For isolation, I agree with JimCasey, flow under the seat will isolate the packing from system pressure, however this is only true...
  19. ValveEngineer123

    What is the main reason to use Y-Pattern Globe Valves?

    Does using a Y-pattern globe valve also reduce the chance of accumulation of debris in a system with a dirty fluid? Also seems as if there would be less potential for erosion in a Y-pattern compared to the conventional globe valve considering the two changes of flow direction in the...
  20. ValveEngineer123

    Determining Product Quality of Valve Manufacturers

    In my opinion, Fisher makes high quality globe valves and pneumatic actuators. Jamesbury (soft seated, double offset) and Neles (metal seated, triple offset), combined with the Jamesbury quadra-power actuator tend to be highly reliable butterfly valves. These valves have seemed to perform well...

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