I am working on a natural gas distribution project, and I am looking for some detail or procedure for hot tapping at the existing natural gas piping. The existing piping is 3" and 4" steel underground piping, and the new branch is 2" HDPE. Could anyone advise where I can find the detail or hot...
Could anyone advise why the smoke dampers are required at HVAC supply and return duct for the electrical room protected by FM200 system? Which code should I refer to for this requirement? I am wondering if FM200 control panel can shut down the air-handling unit instead of smoke damper in case...
I am working on a project to design an underground looped natural gas system with all branches networked together. I am looking for the software for pressure drop calculation and pipe sizing. Has anyone used or heard of any software for this use, or any other advise for the calculations?
Thank...
I am working on a project to design an underground closed loop natural gas system with all branches networked together. I am looking for the software for pressure drop calculation and pipe sizing. Has anyone used or heard of any software for this use, or any other advise for the calculations...
I had always thought that P-trap at the air-handling unit condensate drain connection is needed all the time, no matter if the cooling coil is blow-through or draw-through configuration. However, in the project I am working on, I select a wall-mounted BARD unit with blow through configuration. I...
I am looking for some reference book for the design of the large scale natural gas distribution system. Could anyone give any advise? Thank you very much!
I am working on the HVAC design for a new RO membrane building. Could anyone advise what's the typical indoor design criteria for the building? Does it require any strict temperature or humidity control? Or only some ventilation and anti-freezing heating(in north)? Thank you very much.
In the project I am working on, the existing outdoor air-conditiong (heating and cooling) duct was insulated with 1-1/2" fiberglass and aluminum vapor barrier jacket. However, the insulation at the bottom of the duct always got wet after rain, and already become loose now only after a couple of...
The computer room I am working on is in Houston. The winter outdoor design temperature 20 DB, and 60% RH are used. The space needs to be maintained at 75 +/- 5 Deg. F, and 50% +/- 5% RH throughout the year. The cooling load is about 6 ton and almost 100% sensible load. The outdoor air is about...
I am looking for a pump manufacturer, who can make high pressure water pump with 60,000 psi for jet cutting. The motor needs to be hydraulic driven.
Thanks for help!
Hello, everyone,
I am working on a project, and need to locate several air-handling units on the rooftop. I heard before that OSHA code requires the rooftop unit cannot be located within 10 ft from edge of the building. Does anyone know if it is true? If yes, which section in OSHA address the...
Both Internation and Uniform Fire Codes require automatic fire sprinkler system for the heath hazard storage space (H occupancy). Can anyone explain why the automatic fire sprinkler system is still required, even when the hazard material is only corrosive (sodium hydroxide), and not flammable or...
What's the best duct material for the underground odor (H2S) control exhaust duct? FRP, HDPE or PVC schedule 80? The vacuum pressure of the exhaust system is about 5 inch...
Thanks!!!
I am working on a odor control (exhaust) project for a waste water treatment plant. The underground duct needs to be 12" dia, and the air stream contains H2S. Shall I use FRP or HDPE for underground section? Any advantage to use HDPE instead of FRP?
Thank you in advance.
I am modifying an existing HVAC system serving a pump station in a waste water treatment plant. It has to be maintained at 0.1" WC positive pressure relative to the atmosphere. The room has existing exhaust louvers at exterior wall, and the client would like us to re-use them. Is it possible to...
