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  • Users: boze
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  1. boze

    Back Flow Preventer

    Installing a potable back flow valve system, and have seen some systems with a strainer ahead of the valves. I do not see this addressed in the plumbing code. Some systems include a strainer, and this seems to be practical. Ideas and comments will be appreciated. Current plan (by others) is to...
  2. boze

    pressure vessel stiffening rings

    I have had a request for designing longitudinal stiffening rings versus circumferential ring design in the ASME VIII code, for vacuum considerations on a vertical cylindrical tank. My response was that I am not aware of any code that indicates design for the longitudinal design calculations...
  3. boze

    Safety Pressure Relief Valve Installation

    Modifying existing an 8" dia 275 psig branch steam line reduced to 100 psi. A pressure relief valve is located on the 8" 100 psi side. The restricted space for the relief valve from the 8" steam line requires that the branch to the relief valve is a minimum of 4'horizontal, then an elbow for...
  4. boze

    Steam Pipe Heat Loss Through Support Shoe

    Would appreciate source for calculating the heat loss through a pipe shoe (direct steel from pipe to support frame) from an insulated pipe. Support shoe is a Tee, Structural W, and fabricated shape.
  5. boze

    Piping Vibration

    I have about 30 copies from a Piping Design Book, and would appreciate source/Author of the Book. For reference: Page 262 Table 9.1 provides vibration frequency coefficient 'alpha', for pipe or uniform bar. Coefficients are for cantilever, simply supported, and other conditions. Could this be...
  6. boze

    Moisture Condensation Problem

    Condensation is draining down the walls in an automobile 4 car garage. Construction is recent. High quality concrete construction wall and flat roof. Ceiling is insulated and covered with panels. Very tight construction, including doors, restricts natural air changes. First consideration is to...
  7. boze

    Vertical Turbine Pump Sesimic Calculation

    Need to calculate seismic conditions for a Vertical turbine pump, 75 hp, mounted on concrete pad. with shell extending 40' into soil. Soil can provide restraint of shell column (casing) dependent on mass of soil, and will assume there is no horizontal shell casing movement relative to the pad...
  8. boze

    AWWA standards

    What AWWA code applies for adding a 4" SS branch connection to a 48" penstock.(have requested penstock material spec from client). Have multiple ASME codes 31.xx, and also have an AWWA calc sheet for branch connection, but do not know if it is latest code. What AWWA spec relates to calculating...
  9. boze

    ASCE 7-05 eqn 13.6.2

    Equation for T (fundamental period) includes factor Kp, for component stiffness. Need to establish a K value for several liquid tanks in the range of 8'diameter, 9' high. Have not been able to find specific information for a K value, so am considering using a cantilever beam to develop a value...
  10. boze

    RC/PSC tank definition

    Investigating tank sloshing requirements for HDPE tanks anchored on concrete pads. Considering the Height to diameter ratio 1.5/1 max for nominal 8000 gallons, I do not believe there is a problem. Have ASCE 7-05 etc, and see definition for steel, concrete, and RC/PSC tanks. What category does...
  11. boze

    HDPE tank tie-down

    Have HDPE tanks (indoor - 6 to 10000 gallons) that require cable/strap tie downs to concrete anchorage. Do not see any special magic to design the cinch anchors and cable, but others may have tips or words of warning. Comments will be appreciated.
  12. boze

    dgn linetype

    How to remove or fix Dgn linetype style 1. Running 2005 LT. Not sure where to find the file, in hopes of deleting it.
  13. boze

    Branch Piping Turbulence

    Need some opinions on the following flow situation, which I believe will cost many dollars and not provide significant results. Have a request to determine flow disturbance created by modifying an existing piping system. Turbulent flow (water at std conditions) in 8' diameter pipe. Install 24"...
  14. boze

    Jib Crane Bearings

    Client wants to build his own 1 ton 360 degree swing jib crane. Have a number of books and references, but still have questions regarding bearing selection design. Top bearing - probably spherical and thrust bearing. Lower bearing - thought of several Gill roller bearings for the knee brace/...
  15. boze

    High Rise Flue Stacks - Part 2

    Looking for a design source, guidelines, etc for vent stack systems installed 20 - 30 years ago. Need to modify an existing system. Have discussed with several local code departments Part 1 raised the question regarding design guidelines for multiple insert gas fireplaces in a multi story high...
  16. boze

    High Rise Flue Stacks

    Looking for flue design considerations for High rise apartments with gas insert fireplaces venting into a common stack. While the ASHRAE systems book addresses draft inducers and several aspects, I am looking for reference information that more directly addresses high rise systems. Have designed...
  17. boze

    Pipe Support Blocks

    Need to copy a whole series of pipe support details from a pdf file into Autocad. Am looking for supports in block form, and have not had luck using key words. There must be a thread for autocad blocks.
  18. boze

    AWWA D103-97

    My first pass with designing bolted steel tanks per D103. Code book has limited information. Would like several references for related design books. One specific question, Equation 1, Page 9, units don't match. I added conversion .433 to get balance. Wall thickness result appears much greater...
  19. boze

    Handrail 200 lb force

    Osha codes and IBC codes require that handrails can sustain a 200 lb force. One of the codes, but not the other, includes "200 lb force in any direction". Any direction of course includes vertical force. This is easily accomplished by pinning the handrail at the base. How about the situation...
  20. boze

    Ductile Iron Pipe Supports

    Question regards ductile iron piping supports. We are designing a pipe rack module (skid)which will be floor mounted. Will likely be using unistrut for supporting pipes up to 24" diameter. Support frames are at 8' spacing to accomodate some of the smaller piping. Are saddles routine or required...

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