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  • Users: IanVG
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  1. IanVG

    How to create new FAQ

    I've seen some posts floating around, but I haven't found anything definitive around how to create FAQ's. It seems that I do not have the permissions to create a new FAQ category in HVAC/R Engineering. I'd like to create a new FAQ for fan selection questions. How do I find or message an admin...
  2. IanVG

    Understanding Concrete Framing Slope Annotation

    Good morning all - I'm trying to figure out slope for a concrete lab on composite steel deck. I've got the following drawing which appears to show that the elevation at the drain is 1' higher than the elevation at the "high" point of the slab. What am I missing here? Based on the description of...
  3. IanVG

    IMC Occupancy Classification Art Classroom

    Hey all! Working on a renovation to combine two existing spaces (Photo Advanced Classroom and Photo Alt Process were the original room names) in an higher education (university) art building. Based on IMC Table 403.3.1.1 Minimum Ventilation Rates for an Art Classroom, exhaust is required at a...
  4. IanVG

    ASHRAE 62.1 Ventilation Rate Procedure (VRP) Question

    Hello! This is a repeat post, to help answer at least one question that I had in this post. For the ASHRAE VRP calculator, the calculation is broken up by zones, and these zones must be classified as one type or another. If I have a zone that is actually a combination of rooms/spaces with...
  5. IanVG

    Calculation or Design Guidelines for Proper Sizing of Flexible Floating Ball Extractor

    The only other thread that I could find on this topic is here. I have a tank that is used to store water for pumped non-potable use. The tank's rough dimensions are 8ft in diameter and roughly 10ft in depth (cylindrical shape). Approximately 1ft from the bottom I have a outlet for the tank that...
  6. IanVG

    First Concrete Joist Spacing for One-Way Joist Slab System

    This is more or less a follow-up to my previous post (thread507-523158), but maybe understanding this point will help me understand the other point. On the one detail for typical joist construction for this project, I see that the first pan is variable dimension ('30", 20", 15" or 10" pans as...
  7. IanVG

    Joist Span Dimensions Question

    Hello all! Another question from a ME with little experience in structural engineering. For drawings from the early 1970's in the southeastern U.S., how were concrete joist spans dimensioned? I can figure the span length from the distance from beam to beam, but from the top to the bottom of the...
  8. IanVG

    Calculating Natural Gas BTU or CFH Load for Existing Laboratory Building

    Does anyone here know if there are any useful tables (International Fuel Gas Code maybe?) or methods to calculate BTU or CFH loads from turrets in laboratories? Honestly, any design guide resources on determining natural gas loads would serve me very well. I'm at a loss when sizing natural gas...
  9. IanVG

    Modeling a Stepped Footing

    Hello all, I've got another Revit modeling question as regards a structural footing. A note in the drawing (from 1968) specifies that: "The maximum wall footing ste-off shall be 2'-0" vertical spaced not less than 4'-0" o.c. Footing step-offs are indicated on plans by the symbol...
  10. IanVG

    Longevity of Propress Piping

    One of my customer recently insisted on using Propress instead of soldered Type L copper. I think it was run with primarily because of how quickly it could be installed. Is this kind of technology reliable and proven? I work on an old university campus, so ideally I like to specify products and...
  11. IanVG

    Wafer Check Valves K-Value Match in Crane TP-410

    I am trying to model the loss coefficient (Cv or K value) through a non-slam wafer check valve (as it's specified in my job). I see that there are a few different types of check valves that Crane's TP-410 paper provides loss coefficients for the following valves. I used a 8" size for the...
  12. IanVG

    Old Drawing Annotation "Depth w/out PL"

    Good afternoon struct-e's. I'm looking at a schedule of columns and footings for a building built in 1968, and trying to model the footings in Revit. For the footings, one of the rows indicates the "DEPTH W/OUT PL." [Depth without PL] Does anybody know what this means? Piling maybe? I don't see...
  13. IanVG

    Black Steel and Carbon Steel Terminology

    This is probably going to get me some links to other posts, mil-spec's and standards, but can anyone define the difference creation, use and alloy-wise between black steel and carbon steel? I've heard they are different, but as far as my understanding goes, black steel is just a kind of carbon...
  14. IanVG

    Valve Authority for Chiller Valve in Variable Primary Variable Secondary System

    I think I've got a good grasp on what valve authority is for individual circuits and how to apply it for designing & selecting AHU/FCU coil valves, but I cannot seem to find good guidance specifically for valve authority for variable primary and variable secondary systems. I got a full hydraulic...
  15. IanVG

    Standard/Specification for Mechanical Nameplates with Insulation

    Hello all! I'm wondering if anyone has knowledge or has created a specification that's related to nameplates on equipment that is supposed to be insulated. Haha, I have been frustrated in trying to get old equipment information off of anything connected into our chilled water system, and I'm...
  16. IanVG

    Laboratory Envelope Design and Calculations for Mechanical Engineers

    Before I start, I want to mention that this forum thread was very helpful to understand what other engineers do to handle lab pressure. I wanted to reach out see if there was a chapter or resource somewhere that guides a mechanical engineer through laboratory envelope design. I work with...
  17. IanVG

    Primary Secondary Zone Chilled Water System Functionality and Resources

    Hey everyone! Got another question for the community. I am replacing two pumps (not headered) for two chiller pumps. The only graphic I've found anywhere that shows the kind of system I am working with is here. The fifth system described in this JMP article is nearly the same kind of system I...
  18. IanVG

    How to Calculate Concentration of Vapor, Gas, Fume, Mist or Dust for LFL

    Hey everyone, I'm stuck on a laboratory renovation determining which code from IMC 510 (Hazardous Exhaust Systems) is applicable. Per the exception listed for labs: "Exception: Laboratories, as defined in Section 510.1, except where the concentration listed in Item 1 are exceeded or (emphasis...
  19. IanVG

    Question on Makeup Air for hazardous Exhaust System

    Hey everyone, I've got a question about a piece of code from the 2018 International Mechanical Code (IMC). Section 510.6.5 states for makeup air for hazardous exhaust systems that: Makeup air shall be provided at a rate approximately equal to the rate that air is exhausted by the hazardous...
  20. IanVG

    Cv Value for Steam Trap Condensate Flow

    Does anyone know if there are any rule of thumb Cv values for any steam traps? I.e. let's say I've got a float & thermostatic trap that's being used to drain a leg of cooled condensate. I'm trying to calc how long the leg will take to drain.

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