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I installed a 75 Hp Fire Pump. The pump starter is a D-Y reduced voltage. The pump has two Power supply one is from the utility power company and the second is from an emergency electrical generator. The question is as follows: Does the emergency electrical plant has to be capable of start...

Per NEC Art. 392 single #12 conductors can not be used in a cabletray. I would like to know why.

In an grid system 2-1/2" and 1-1/4" can I use pipe saddles instead of 2-1/2x2-1/2x1-1/4" tees?.

I would like to know if there are a maximum velocity in sprinklers systems piping per FM and NFPA.

In parkings floors, in a high rise building, for a extended coverage of 400 sq ft per sprinkler head can I use ECOH with K=11.4 or else? Pressure here is not and issue.

I will use ECOH sprinklers heads (K=11.2)in parkings floors. I need help in sizing the pipe.

Can I use SCH 10 pipe in each floor and SCH 40 in riser? The static head in some floors is almost 250 psig.

A 40 story building has 30 office floors and 10 parking floors. Offices are Light hazard and parkings are Ordinary hazard 1. A listed plastic pipe can be used in office floors?.

Six cooling towers with a total of 6900 gpm are manifolded to a 18" pipe header and the velocity is 9.9 ft/sec. If we change to a 16" header de velocity will raise to 12.5 ft/sec. It is only occurring less than 1500 hrs per year. The most of the time (at nights) the system will have...

I have to install foam chambers in a diesel tank. The tanks are partially filled. I need security standars and procedures.

In a 46 story building de HVACR and Fire suppresion systems uses schedule 40 steel pipe. In the basement the static pressure is approximately 228 psi. Does the Shc 40 pipe wistand pressures greatter than 300 psig? What class of fittings and valves do we have to use?. Do Victaulic or Anvil...

In a 46 story building de HVACR and Fire suppresion systems uses schedule 40 steel pipe. In the basement the static pressure is approximately 228 psi. Does the Shc 40 pipe wistand pressures greatter than 300 psig? What class of fittings and valves do we have to use?. Do Victaulic or Anvil...

A water mist fire suppression systems requires water flows up to 40 gpm at pressures up to 100 bars. The pipe diameters are up to 1". I would like to know if I can use cooper instead of stainless steel. I also need to know the kind of fittings and the machines to use for.

I would like to know a web site with information on fittings and machines.

I need to know about tools and equipment for high pressure piping in water mist systems.

FM-200 or FE-227 is Ashrae HFC-227. The density at 70 F is 2.2075. So the specific volume is 1/2.2075=0.4530. The concentration is 7% so 0.4530*.07=0.0317. Then for 1000 cu ft you will need 31.7 pounds of FM-200. The exact number is .034 pounds per cu ft or protected room. See NFPA 2000 for...

For 70 F and 7% concentration, I need to have an idea of price per square feet or by pound.

From a PDU to a computer receptacles we have two 120 v circuits in the same EMT conduit. Does one circuit induce noise in the other circuit because the electric and magnetics fields.

We have a 200% Neutral Power Distribution Units in a "Data Center". Do we need a 200% Neutral to the 120Volt-20amps wiring to computers receptacles.

ITT Bell&Gossett has a System Syzer Calculator. Also Mear of Hunter Associates has a Water flow calculators. ITT B&G is for pipes in laminar flow. Mear´s Calculator is for pipes, ducts, sewers an open channels.