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  1. michael333

    Process Gas Lines and Fuel Oil Line in Same Trench?

    Hello EdStainless, Thank you on clarifying CP. Is there a code reference to look up that states high purity gas lines need to be fully inspectable??? Yes, SS for the gas lines. Good question! My guess is the low pressure Argon is in the range of 850psi or below. High pressure Argon is...
  2. michael333

    Process Gas Lines and Fuel Oil Line in Same Trench?

    Hello LittleInch, Thanks for your response! To answer your questions: Surface trench with grating, or trench box, so the client can visually inspect the length of the pipe. No, the client does not have an agreed upon piping design code. Your question makes perfect sense, but this client...
  3. michael333

    Process Gas Lines and Fuel Oil Line in Same Trench?

    Hello, Got a project where the client is asking us advice about running several lines in a trench. Advise them on what to do. The lines include 2" Nitrogen, 2" helium, 2" low pressure argon, 3/4" high pressure argon, and 4" fuel oil line. Questions: 1) Can the process gas lines and the...
  4. michael333

    Splitting the NG Flow between 2 Valves: What will Pressures Be? & Equal to a Maxon Valve?

    Thank you 1503-44 for your response.
  5. michael333

    Splitting the NG Flow between 2 Valves: What will Pressures Be? & Equal to a Maxon Valve?

    Hello, I have an application for natural gas (NG) of Scenarios 1 & 2. All 6" diameter Sch 40 Carbon Steel piping in the system. Please see attached Maxon_Valves_Pressures.pdf for your clarity. Scenario 1: Have a 6" NG main line coming in from the gas company to a plant via a parallel set...
  6. michael333

    Natural Gas Pipe Sizing: Velocity vs Pressure Drop

    Hello Out There, Context: I'm sizing a natural gas(NG) line (high pressure) from an a tie-in to an existing 6"main gas line over to 4 new gas-fired generators. First time in sizing a high pressure piping section branch. I'm using the high-pressure gas equation 4-2 from the IFGC. It's been...
  7. michael333

    Installed Inline Centrifugal Fans Not Performing ??

    Herr, Internal Static Pressure drop of HX (CA2X) is approx .25 in. H2O @ 500 CFM according to Renewaire literature. MERV 8 filters on inlet faces of the internal Lossnay core is .29 in wg according to filter literature. Looking at ~0.55 across the HX. I'll direct the TAB to take actual PD...
  8. michael333

    Installed Inline Centrifugal Fans Not Performing ??

    To Everyone, I have a design where I'm using 2 inline centrifugal fans (each fan is Cook: Model GN-740) in a pull-pull arrangement for crossing airstreams via a static plate heat exchanger (Renewaire: Model CA2X). EF-3 exhausts air from public restrooms and a janitor's closet via the CA2X out...
  9. michael333

    Condensing Boiler Tripping Out on High Fire?

    Hello, I have (3) P-K condensing boilers (MACH Model C-300 w/ ENVI Control) for a small job. Each C-300 is rated as follows: Output 276,000 BTU/hr heating capactiy at full-fire Flow rate @ 20 delta T: 28 GPM Flow rate @ 40 delta T: 14 GPM Each C-300 has its own isolation valve associated with...
  10. michael333

    New Inline Exhaust Fan ??

    To Whom Can Help: I've designed a new 13 inch dia SS exhaust duct route to connect to an existing exhaust duct (please see attached system diagram). The new exhaust duct serves (2) engravers. Each engraver requires 900 cfm each. So I have 1800 cfm total in the new 13 inch dia duct. I wanted to...
  11. michael333

    Toilet Exhaust thru an ERV with a rotating wheel??

    Hello, I haven't been here in a while. I have an application where I'm currently exhausting 525 CFM @ .75 ESP from public restrooms and a janitor's closet through a energy recovery ventilator (ERV) with a static plate total heat exchanger (RenewAire). I'm bringing in 250 CFM @ .75 to 1.0 ESP of...
  12. michael333

    Question on Check Valve for Gravity-Fed Condensate Drain

    Hi willard3, Thank you for your input. Thanks goes out to MechEngNCPE and MintJulep as well. The height difference between the pan and drain is 2 inches, 3 inches at the most. I'm going to recommnend they install a condensate pump in the 1-1/2 common cond line and re-route it to the...
  13. michael333

    Question on Check Valve for Gravity-Fed Condensate Drain

    I've designed 2 horizontal fan coil units with cooling coils above a lay-in ceiling. I've routed 1 inch condensate lines from each FCU into a common 1-1/2 inch cond line. The common 1-1/2 cond line is then routed and connected to an existing 4 inch storm drain stack rain leader (SD). I've used a...
  14. michael333

    2009 LEED O&M Policies?

    Hello, Our company is pursuing certification under the 2009 LEED O&M umbrella. I need to write up policies (i.e., water efficiency, energy and atmosphere, indoor enviromental quality)that are required as part of the credit templates. Does anyone know where I can find online sample policies...
  15. michael333

    TYPE - B Gas Vent for Oil Fired Boilers?

    Hello Everyone, I have a design where we're installing (2) 200 HP steam boilers. The steam boilers are gas and oil fired. We plan to route (2) 18" vent stacks(each boiler has 18" vent stack connection) into (1) 28" common vent straight up and out through the roof. I'm looking at a UL rated...
  16. michael333

    LEED 2009 for Existing Buildings O&M?

    Has any Mechanical Engineers out there been through the process of submitting WE, EA, IEQ prerequisites and credits for the "LEED 2009 for Existing Buildings Operations & Maintenance??" I've read through the main reference manual "Green Buildings Operation & Maintenance" and have discovered...
  17. michael333

    Combustion, Vent, & Dilution Air Req'd ??

    I have a question for interpreting Section 304.1 out of the 2006 International Fuel Gas Code (IFGS). Taking a test on it and I need to understand this section. How do I know when the requirements of section 304.5 are NOT met, and outdoor air NEEDS to be introduced in accordance with sections...
  18. michael333

    Sizing Chimney Vents

    Here are my givens for the application: (3) gas-fired furnaces: 80000 btu/h input ea. (240000 btu/h) All three furnaces are side-by-side in an enclosed mech room. Volume of the space is approx. 20'L x 12'W x 10' high Will (1) 10" diameter vent connected to all three furnaces via a manifold to...
  19. michael333

    Question on if a Day Tank is Needed??

    I have question on whether or not I need to remove an installed day tank? I have an aboveground 5K gal fuel storage tank, a Pryco 150 gal day tank, and a generator set that's all installed outside on a concrete pad. Both tanks and generator set are all on the "same level" conc pad. Level of...
  20. michael333

    Servery Exhaust Hoods Interlocked with Gas Supply to Equipment

    Hello All! I have a design with three separate Type I exhaust hoods in a Servery for venting typical kitchen equipment which is Gas-Supplied. The make-up air/cooling for the Servery is provided from a rooftop vav unit. This is a Servery for a dining hall on a college campus. The exhaust fans...

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