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Recent content by boze

  1. boze

    Back Flow Preventer

    Thanks to all for responding. Responses provide very satisfactory viewpoints.
  2. 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...
  3. boze

    pressure vessel stiffening rings

    Thanks to all for your response regarding the lateral stiffening for a cylindrical tank. I doubt that I will pursue this. This is such a helpful source for information. Boze
  4. 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...
  5. boze

    Safety Pressure Relief Valve Installation

    "Basic rules" come from a Valve manufacturer's catalog showing comments and diagrams for the supply line to the valve, indicating that a long run,including horizontal and elbow(s) shall increase the supply line 2 sizes. Although long run is not defined, judgement enters into the solution.
  6. 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...
  7. 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.
  8. boze

    Piping Vibration

    kacarrol Thanks for the reference. Interesting cost. New book is in the $24 dollar range. Used book is in the $48 dollar range. Apparently the used book is the original of 50 some years ago. I am tempted to purchase the used book. Selecting the old book may be based on a coin flip right after...
  9. 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...
  10. boze

    Moisture Condensation Problem

    Thanks to all for their input. Contractor will provide cross ventilation, and a fan with a timer for night operation. At this time, having no data on the amount of condensate, I have suggested a 2-4 ACH, as a best guess. I have also suggested as an alternative, to install a dehumidifier and...
  11. boze

    Moisture Condensation Problem

    The garage was constructed during the summer,and condensation was first noticed within the past month. Observed condensation is at the ceiling to wall interface and working down the wall. Only the ceiling is insulated, and I have contacted the supplier for specific data and installation...
  12. 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...
  13. 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...
  14. 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...
  15. 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...
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