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  • Users: PEDARRIN2
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  1. PEDARRIN2

    Natural Gas Pressure Regulator Turn Down Ratio

    This question is geared toward building natural gas regulators where the inlet presssure is likely to max at 10 psig and be regulatored down to 7 in w.c. Flows are going to be on the low end, likely maxing out at around 10,000 cfh. I am familiar with natural gas equipment turn down ratios but...
  2. PEDARRIN2

    Thrust block installed on top of pipe bend

    I do not deal a lot with thrust blocks - use mechanically restrained joints like Mega Lug - but ran into this "standard detail" that contravenes my previous understanding. The detail is from a fairly sizable municipality. My understanding is thrust blocks rely on undisturbed soil to be the...
  3. PEDARRIN2

    Toilet Fixtures for a High School Grandstand

    In determining how to comply with the code required minimum number of toilet/lavatory fixtures for a outdoor grandstand at a high school, has anyone ever gotten permission to utilize temporary toilets and hand washing stations to supplement permanent facilities? I see nothing in the...
  4. PEDARRIN2

    Heat Tracing Polypropylene Pipe

    Has anybody ever applied self regulated heat trace cable (for freeze protection) to polypropylene pipe? Have an application where trying to supply RO water to an exterior located HVAC unit with humidification. Not real keen on applying heat trace to a pipe system whose joints are made by heat...
  5. PEDARRIN2

    Saw a sprinkler fitting I have neve

    Saw a sprinkler fitting I have never seen before. Contractor called it a "Key Lock" fitting. Anybody know the manufacturer?https://files.engineering.com/getfile.aspx?folder=aaf03417-6772-46dd-9c2a-b6b6489514ed&file=SPRINKLER_FITTINGS.pdf
  6. PEDARRIN2

    Heat Transfer in a Drainage Pipe

    Trying to determine how quickly the water temperature in a partially full sanitary drainage pipe will drop from 180 F to 140 F. The rationale is to determine where in the piping system I can transition from Cast Iron pipe to PVC when I have a discharge to the system from a boiler/water...
  7. PEDARRIN2

    Cleaning the air

    https://globalplasmasolutions.com/ I deal more on the water side of dealing with microbial issues in buildings. My company wants to install this in our office as part of our COVID response prior to coming back from remote work. When/if I see something like this on the water side, I typically...
  8. PEDARRIN2

    Valves for Ultra High Rise (>420 ft) Sprinkler/Standpipe system

    I have a project where I am designing the standpipe/sprinkler system where the standpipe valve on the top floor is about 555 ft above grade. At present, the system is being designed with two fire pumps in series where the upstream will feed the lower floors and be the suction source for the...
  9. PEDARRIN2

    Interpretation of International Building Code 1006.2.2.1 for egress requirements based on BTUH input

    When determining the number of exits from a boiler, incinerator, or furnace room, when referring to the maximum 400,000 BTUH input capacity, does "any" indicate a single piece of equipment or an aggregate of all the equipment in the room? Example would be if I had 3 domestic water heaters with...
  10. PEDARRIN2

    Hanger Rod Length

    Is there some type of guidance for the maximum length of all thread in a non seismic project without lateral support? We have a project where a 3" copper domestic water pipe is suspended about 30' aff using clevis hangers spaced about 8 feet apart. The pipe is swaying about 2"-3" side to side...
  11. PEDARRIN2

    ASHRAE 90.1-2010 Table 7.8 Hot Water Supply Boilers

    Looking at the table for hot water supply boilers (for domestic water heating), there is a criteria which indicates >= 10 gal. Part of the requirements is calculating the standby loss. How can a hot water supply boiler (assuming this means a side arm type) have more than 10 gallons of water in...
  12. PEDARRIN2

    Dissolved Calcium and UV Water Treatment

    Was reading a resource, (http://www.nesc.wvu.edu/pdf/dw/publications/ontap/2009_tb/ultraviolet_DWFSOM53.pdf) and noticed it made a statement on page 3, "And some dissolved minerals, such as calcium, have a tremendous negative effect on UV absorbance." I realize that hard water can deposit scale...
  13. PEDARRIN2

    Natural Gas to Floating Building

    Has anybody designed a natural gas service (1-2 psig) to a floating building (basically a heated storage building for fire department boats) on a river bank? Have a building with some gas heat and a generator where the gas service is on land above 100 year flood stage. Has a walk way, which is...
  14. PEDARRIN2

    Water Hammer Calculations - Part 2

    thread378-399464 In my previous thread, i was looking for guidance on how to calculate what was happening on the upstream side of a quick closing valve. Thanks for all who provided insight. But there is another aspect of water hammer I have not seen much information/guidance I can use to...
  15. PEDARRIN2

    Water Hammer Calculations

    I have looked on other threads. I have looked at technical documents. I have looked at on line calculators. I am missing something. There seems to be two different ways to calculate the pressure and/or force exerted when flow is stopped by a quick acting valve, i.e. water hammer. One way...
  16. PEDARRIN2

    Viscous Fluid (Fuel Oil/Diesel Fuel) Pipe Sizing

    I am trying to set up a spreadsheet to obtain friction loss for fuel oil/diesel fuel fluids - or fluids with viscosities much in excess of water. When I use D'Arcy, I find that there is a fairly narrow band between where the flow would be laminar Re<4,000 and where the velocities are getting a...
  17. PEDARRIN2

    Flow in 4&quot; cast iron pipe

    I am trying to calculate the force on a fitting in an 4" interior horizontal storm pipe (cast iron no hub with no hub bands) But first I need to determine what the actual flow is. assumptions/knowns: piping is full (single phase, no air bubbles) d = 3.94 in L = 20 ft (10 vertical and 10...
  18. PEDARRIN2

    Plug Valve K Factors

    How do you deal with calculating the K factor (from Crane TP 410) of a plug valve where the area of the port is more than the area of the pipe size going to the valve? Example is the Durco G432 plug valve (for natural gas). According to the literature, for the 1/4" to 1/2" valves, the %port...
  19. PEDARRIN2

    Compressed Air Temperature to use in Pipe Friction Loss Calculations

    I am trying to wrap my head around what temperature to use for friction loss calculations for a 150 psig compressed air system. The compressors are sized to produce slightly above what the customer has stated they want for a continuous flow (~1400 scfm). I have a receiver and oversized pipe...
  20. PEDARRIN2

    High Temperature - High Pressure Compressed Air

    I am assisting another engineer who is trying to design a piping system for a research client that requires compressed air at 150 psig at 800 F. They require stainless steel to minimize any impurities from the piping entering the air stream. This is outside the standard compressed air system...

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