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Hello All, I need help with code clarification I am designing a 4-story building which will be built with shipping containers South side of the property line sits on public greenbelt. Distance between South building wall and South property line is 1’-6”. West wall is at the west property...

Hello All, I am designing a salon which has 10 pedicure stations. I got submittals for pedicure chair. This chair has two 1-1/8" pvc exhaust pipes. Code requires 50-cfm exhaust per station. When I calculate external static pressure (E.S.P) drop to size the fan, sucking 25-cfm from 1" pipe has a...

Building Pressure Relief Hi Friends, I design HVAC systems and often include means to relieve building pressure. A common practice for almost all HVAC engineers . My question is where in the CODE BOOK (IMC OR UMC)does it states to provide building pressure relief if we are not using...

Hi Experts , International Mechanical Code (IMC) does not allow corridor to be used for return air path. Can we use corridor as return air path under 2012 Rehabilitation Code ?

Hi Friends, I am working on a retirement center. It is a Type II construction where ceilings are 1-hour rated. The building is fully sprinklered. Do I need fire-rated diffusers? Please guide Thanks Fayaz

Dear friends, I am working on a surgical suite, where there are two operating room 30 sq. m each and a corridor with small sterile storage room. AIA & ASHRAE call for min 15 air changes per hour (minimum). I know VFD and VAV boxes are specified to turn-down supply air in unoccupied mode, but...

Chicopee ......... There are 6 OTs around nursing station. Each OT is pressurized to 20% with respect to surroundings. All the excess air leaks into the nursing station. Total air from OTs is more than what I need for Nursing station ventilation. So, do I have to add more air for nursing...

Hello friends, Need your input : Surgical suite consists of 6 operating rooms and a support area in the middle (nursing station) Operating rooms are pressurized and have proper ventilation. AIA 2006 and ASHRAE calls for 6 air-changes with 2 outside air changes for support area In my case...

Hi, Anyone can give me budget price per ton for CRAC unit including condensing unit. I know this question is for sales engineers. I have to put a budget together ASAP and all companies in US and Europe are closed for the weekend. Please help Sincerely, Fayaz Din

Hi friends, I never done this before but now I have to ……………… I have to install a pump on a city water line to pull water and pump into underground water tank. I know it is illegal in many countries but in other countries, there is no other choice because the city water pressure is very low...

Thank you all

Dear Members, My question is why do we need expansion tank on chilled water system? Here is the situation ………. Ambient temperature = 40 deg. C Chilled water temperature = 5 deg. C Chiller Tons: 100 Thermal expansion of water is 0.00214 1/ deg. C = 0.0043 gallons per 25 deg. C System volume =...

Hello dear members I am designing a water system for a hospital. Below is the data : Pump-1 draws water from city line and dump water into two underground tanks. City water pressure is very low, that is why a pump is required to pull water from city line and pump it to underground tanks. Pump-2...

Dear friends, I have a very simple chilled water system with the following characteristics • Warehouse application • Two chillers with constant flow pumps • Four AHUs for with 3-way control valves Sequence: When space temperature reaches a setpoint, flow through AHU coil stops and chilled water...

Hi, I need basic help with block. I build a block in block editor. I close the block editor and insert it in the main model space The block works with the MOVE command but doesn't work with STRETCH command. Any Solution? I used to build block which could work with both MOVE & STRETCH...

cdafd below is the reference. What are common examples of the various flammable and combustible liquids classified by NFPA 30? Class IA - Diethyl Ether, Ethylene Oxide, some light crude oils Class IB - Motor and Aviation Gasolines, Toluene, Lacquers, Lacquer Thinner Class IC - Xylene, some...

Hi, For paint manufacturing plant, what will apply? NFPA 11 or (Low expansion foam) NFPA 11A? (Medium and High expansion foam)? Please advise Fayaz

I am designing wet riser system with landing valve and 25-mm hose reel for a 4-story building. The building is a part of a campus with a fire ring main maintained at 10-bar (150-psi). The owner asked me to provide landing valve with PRV & should have PRV at hose reels. The system is to be...

Pumps basics: Centrifugal Fire- Pump: Impeller dia = constant, Power = Constant Q1 = 1000-gpm, H1 = 335-ft Affinity Law: (H2/H1) = (Q2/Q1)^2 If Q2 = 100-gpm, H2 = 3.35-ft Is this correct? The head should go up for lower flows for constant power and constant impeller diameter. Why am I...

I am working on a 6000 sq. m strip mall with six 2-story stores that require total of 510 sprinklers. Considering 1500 sq. ft for the most demanding fire area, I need 4” pipe all the way to the source. The question is ………….. Why do we increase pipe sizes above 4” 1) Because of pressure drop...