This is more of a physics problem, but deals with gas.
According to Astro Physics Scientists, a star is made when a huge cloud of H2 starts coming together by gravity. The gas packs in tighter and tighter, creating higher and higher pressure and temperature, till pressure/temperature reaches...
NFPA 25 - 2020 says that concealed sprinklers above a suspended ceiling need not be inspected. What about sprinklers for the attic with wood trusses? If not inspected, how do you know they are really in place? What if the ceiling is gyp. board?
Anyone run into this?
This is probably easy for someone, but not for me. How do I suppress the feet and inches symbols in dimensioning? That is, if the length of pipe (fire sprinkler shop drawing) is 7'-8", how to I make it show 7-8? I have been all through DIMSTYLE and it does not mention it. I am using ACAD 2002...
For a building (ordinary hazard, grp 1) that has a lot of sf of attached canopies outside, is the area covered by the canopies calculated separately? That is, 1500 sf of canopies or 1500 sf of indoor pendant heads. NFPA 13 does not address this. The local fire Chief ducked my question and...
My old Calculus text (Johnson and Kiokemeister) says that Calculus was "well known" before Newton and Liebnitz. Alright, known by whom? Any proof anyone?
Just curious. Do any of you use non-metallic rebar for reinforced concrete? Seems like a good idea to avoid corrosion and failure. What kind and does it work? Thanks.
Given: large room with existing heads up near roof (no drop ceiling), lots of piping and ducts below, + lots and lots of vertical boards hanging (acoustical to absorb noise of manufacturing). These boards are about 24" x 18" and are several feet below structure. The area is Ordinary Hazard...
Given that PV=ZnRT for a vessel. For a given Volume, Temp, and initial pressure, and Mole Weight of methane, the LbMoles of methane can be calculated.
Now, add some more methane to the vessel from a high pressure source. Now, the mole wt in the vessel has changed. Assuming no change in...
How do I print output from a GW Basic program? I know LPrint will not work with USB printers so I wish to print to a TXT file. That way, I can print out whatever. Hope some old DOS veterans can help. Thanks.
Where can I find data on pressure drop through a sanitary wye? Equivalent length or K-factor will do. Thanks. (I have already searched the forum - no luck).
That horrible mess in Brazil is why we have codes. Idiots who allow places of assembly with just 1 exit and NO auto sprinklers should be hanged. When will they stop allowing fireworks inside without adequate protection? I am disgusted.
As per 2007 edition, 8.17.2.4.2 says the FDC shall be on the system side of system control, check and alarm valves (wet systems).
8.17.2.4.4 then says the requirements of 8.17.2.4.2 and 8.17.2.4.3 shall not apply where the fire department connection is connected to the underground piping.
This...
Has anyone ever used an old DOS program called, "STREAMLINES"? It is for piping networks. Seems pretty powerful, but is clumsy to use with Windows. Would like to hear from any users on tips to make it easier.
If someone has the ASTM C680 standard, please confirm an item.
I have and old magazine (HPAC, Nov. 94) article for calculations for insulated piping systems. In it is stated that the standard has for convective coefficient the following (for pipes)...
I have seen fire sprinkler drawings for a school where the design area was reduced to 900 sq.ft.. Is this permitted by NFPA 13? I could not find it in the 2002 version. Some of the heads were extended coverage, some were standard pendent heads. Coverage density was 0.1 gpm/sq.ft.
Maybe it is...
Can anyone come up with a good reason to use 2 condenser water pumps for each unit (on supply and return) on a water source heat pump system (geothermal)?
I need recommedations on repairing small pinhole leaks in large (30" to 60" dia.) piping. Piping is transporting air (8 psig) for a sewage treatment plant aeration system. Piping system cannot be opened for repair, but can be shut down for 1-3 hrs. Piping is steel with Dresser couplings. Thanks.
I have a project to specify repair of large (48-60" dia.) steel aeration piping with a lot of pinhole leaks. This is for a sewage treatment plant. The system cannot be opened for internal repair. Air pressure = 8 psig, ambient temperature. The system can be shut down for 1-3 hrs. I am...
