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  • Users: thien2002
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  1. thien2002

    URGENT: Building smells STRONG FUEL ODOR

    Fuel Control Workroom Ventilation Building: We have a writeup is readdressing the issue that they question the adequacy of the ventilation system in this explosion proof room. We have never before had reason to believe it was not functioning as designed, but when the IG visited he smelled JP8...
  2. thien2002

    Size heater to prevent cooling water sump from Freezing HELP!!!

    I have (3) 21' x 7' x 6' Sump Dear Friends, We are being told to prevent this sump water from freezing. I don't know how to spec a heater that would be enough to keep this sump water around 40F when ambient temperatures fall below 40F. I think it will have a thermostat to control the heating...
  3. thien2002

    Heater to prevent sump water from freezing HELP!!!

    I have (3) 21' x 7' x 6' Sump We are being told to prevent this sump water from freezing. I don't know how to spec a heater that would be enough to keep this sump water around 40F when ambient temperatures fall below 40F. I think it will have a thermostat to control the heating operation. This...
  4. thien2002

    HVAC Load Calculation web site ?

    I am a new HVAC Engineer. My boss assigned me to work on a new Fire Station HVAC Load calculation. I used Elite Software CHVAC and Trane Load Express to calculate, I came up with very low BTU/hr for heating load and he said on the RULE of THUMB (can anyone explain this on Cooling & Heating) that...
  5. thien2002

    Please share your experience with Infrared Heating, Co Ray Vac product

    Can experience technical personnels who are experience with Co Ray Vac products please share your current or past experience of Co Ray Vac products (Infrared Heating). I am about to make a major purchase on this product to heat our aircraft hangars. They are coming out with a new product that...
  6. thien2002

    What is the minimum depth to prevent underground pipe from freezing?

    Dear Friends, What resources to look at the minimum depth to prevent underground pipe from freezing (chilled water services with PVC). I am in Enid, Oklahoma. Thank you very much!!!
  7. thien2002

    Soil Erosion Problem, what are the causes?

    I just got a warning letter from Oklahoma City about erosion problem from our new church construction site. We need to fix it ASAP before getting a fine. These are things we need to finish this weekend. Possible solutions: 1) Laying about 5000 sft of sod to prevent erosion problem. 2) Cleaning...
  8. thien2002

    Is Floor Slab Coefficient equal to Floor Slab Coefficient???

    I am using Load Express (Trane), Load Express asks for Loss Coefficient (Btu/hr.F.ft) while Elite software (CHVAC) asks for Floor Slab Coefficient. Are they the same meaning? Can anyone explain to me what are the different between them. Thank you very much!!!
  9. thien2002

    Cathodic Protection procedures, please help!!!

    I have 54'dia. x 35 crt chilled water storage tanks for thermal storage. Our tank contractor provide a submittals for cathodic protection and since I don't have any technical knowledge on cathodic protection, could anyone please point me to the right direction for cathodic protection specs...
  10. thien2002

    How to determine a wetted perimeter in a pipe?

    How to determine a wetted perimeter in a pipe of 12" for wastewater sewage system discharge to a basin.
  11. thien2002

    How to calculate maximum flow rate through a 12" pipe

    I am trying to figure out the maximum daily output for our 12" sewage piping to our wastewater basin. In order to calculate the maximum flow rate, what data do we need to include in our formula or what formula to use? Thank you in advance for your help and contribution!
  12. thien2002

    How to calculate Maximum Daily Output for sewage system?

    I am trying to figure out the maximum daily output for our 12" sewage piping to our wastewater basin. In order to calculate the maximum flow rate, what data do we need to include in our formula or what formula to use? Thank you in advance for your help and contribution!
  13. thien2002

    Purchase a 30% larger than spec N/G boiler, what effect will it have?

    I am going to purchase an AJAX boiler which is 30% more capacity than then RITE boiler because the AJAX salesman told me they do not have the 1,050,000 btuh so we have to purchase the 1,500,000 btuh. What effect will we have to use an oversize Natural Gas boiler. Please help ASAP!!!
  14. thien2002

    Please explain drain/fill nozzle, it is 2 nozzles or 1? ASAP

    Do you agree with this statement: "The 4” drain/fill nozzle is for both functions, as its name indicates. " Can we use 1 nozzle for both drain/fill functions for our thermal storage tanks or do we have to use 1 nozzle for drain and 1 nozzle for make-up water? Thank you so much!
  15. thien2002

    How to connect PVC & Steel Pipe?

    What do we use to connect PVC & Steel pipes? Pipe expansion required? Would that effect the insulation? Can the transition be within the concrete (thrust block) from outside to inside the building? This application is for Chilled Water Supply and Return. Thank you
  16. thien2002

    Control Valves on the Supply or Return Chill Water System?

    My drawing indicates the Honeywell 3-way modulating Control Valves on the Supply side (modulating the return side), shouldn't the Valve be on the Return Side for Chiller Water and Hot Water System? I thought it was a drawing error. Would that effect the flow efficiency if it's located on the...
  17. thien2002

    Which BX brand is better? Ajax or Rite?

    Our shop determination for BX brand would be Rite, but some wants to use Ajax. Any of you have any suggestions? ----------------------------------------------------------- Hot Water Boiler Schedule: 165 GPM Input: 1,050,000 btu/hr Output: 872,000 btu/hr Fuel: N/Gas Remark: Natural draft venting...
  18. thien2002

    Anyone use Lochinvar Copper-Fin Gas Boiler before?

    Dear friends, I don't know if anyone of you ever utilize the Lochinvar Copper-Fin II Gas Boiler before? We are replacing this one with existing steam boiler. Our shop never have experience with this type before. Btu/hr input = 1,260,000 Btu/hr output = 1,058,400 (84% efficiency) CSD-1 Code...
  19. thien2002

    Is 2 coat system enough protective for 40-54F CW AST tanks?

    Tank contractor propose to use Tnemec for protective coating, anyone use this product before? 1. Surface Preparation: a. All interior and exterior weld preparation, grinding, removal of weld flux and splatter to be performed prior to Abrasive blast cleaning b. Interior surfaces...
  20. thien2002

    Protective Coating to tanks, nozzles. Is Tnemec a good brand?

    Tank contractor propose to use Tnemec for protective coating, anyone use this product before? 1. Surface Preparation: a. All interior and exterior weld preparation, grinding, removal of weld flux and splatter to be performed prior to Abrasive blast cleaning b. Interior surfaces...

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