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  • Users: afa13
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  1. afa13

    Fire Dampers insulation

    Hey everyone, I need your help on the following. Do fire dampers (motorized) need insulation when they are installed in the supply or return line to prevent heat loss and condensation? In the fresh air ductwork, you don't but I'm afraid that on the supply and return you might need to insulate...
  2. afa13

    SS/GI connection

    Hello everyone, Is there a risk from connecting a Stainless Steel 316L duct to a galvanized steel duct directly together (only thing seperating them is the gasket in between the flanges)? If so what would be the recommendation to avoid galvanic corrosion? On a similar note, let us say there are...
  3. afa13

    Expansion Tank

    Hey guys, Can someone please explain to me mathematically why should the expansion tank be connected to the suction side of the pump and not at the discharge. I can't seem to understand the point of no pressure change. Doesn't the tank itself exert pressure on the water network? Expansion tank...
  4. afa13

    Will condensation occur?

    Hey guys, Supposedly there is a space with the following properties: T1=23 C Td1= 14 C RH= 55 % Where, T1 is the room temperature, Td1 is the room dew point temperature RH is the relative humidity. Let us say that there is an exhaust fan moving the air from the room to the surrounding outdoor...
  5. afa13

    Supply Air Flow

    Hey Guys, I need your help with the following: I am starting a design and at the moment i'm just brainstorming. I got the outdoor design conditions as well as the indoor conditions. I managed to determine the exfiltration flow rates for each room. But what's been busting my head is how to...
  6. afa13

    Fuel oil in enclosed spaces

    I know that installing fuel oil pipes through basements and enclosed spaces is not recommended. However, in some cases, the client requires a kitchen in the basement thus requiring a supply pipeline of either natural gas or LPG. Natural gas is lighter than air so it is easier to ventilate the...
  7. afa13

    BMS

    Hello, does anyone know how much is the minimum required points that should be connected from the following units to the BMS: 1) chiller 2) AHU 3) FCU 4) Fan 5) Pressurizing fan 6) VAV with reheat coil 7) VAV without reheat 8) Pumps (secondary chilled water circuit)
  8. afa13

    Minimum Cover

    As per american and most standards, lines from the property line to the collection sewer should be at a minimum depth of 3 feet (1 m) at the property line. How bad would it be if the minimum cover is between 0.8 m to 0.9 m...is it dangerous to accept such interval?
  9. afa13

    Negative for pipes

    Does anyone know what does the term "negative for pipes" mean? once i read that a 2.5 inches negative is needed for the pipe....it has nothing to do with pressure....could it be an insulating layer? can someone give more explanation about this topic?
  10. afa13

    Is it possible?

    is it possible that there is no pressure drop(no leakage) in a piping system(regardless of its size) after being pressurised for 24hrs?
  11. afa13

    could it be this be an ASPE ERROR?

    this passage is taken from ASPE: "A minimum slope of 1/4 in./ft (6.4 mm/m) should be provided for pipe 3 in. (80 mm) and smaller, 1/8 in./ft (3.2 mm/m) for 4–6-in. (100–150-mm) pipe, and 1/16 in./ft (1.6 mm/m) for pipe 8 in. (200 mm) and larger." If u convert any of the slopes given in english...
  12. afa13

    Minimum sewage pipe slope

    What is the minimum slope one can use on a sewage system with less than 25 fixture units? I know that 1% is acceptable and sometimes 2% is the least recommended... can you use on that system a pipe with 0.5% slope? And let say i used the manning formula to see if a given slope is...
  13. afa13

    Clarification needed

    Hello, When selecting a pump one should calculate the flow rate of the building supplied. To determine the building's supply one should select the longest piping distance and the the area where the most flow is required, right? or it can be multiple areas «, or one should select all the areas...
  14. afa13

    Electrostatic filter

    What are the criteria upon which an elctrostatic filter is chosen?
  15. afa13

    Cold Rooms

    When designing a cold room should you introduce ventilation or not and if so should it be a positive pressure or a negative one? P.S: the cold room is used for food storage (meat, fruits, canned food, etc...)
  16. afa13

    Convective Heat output

    I need some clarification regarding the following formula: Qconv = Pn x Qs x b x ϕ this equation is used to determine the cooking appliance's convective heat output in kw, 'b' and 'ϕ' are coefficients easily determined. I am confused whether to use the actual capacity of the appliance for 'Pn'...

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