Return Bends on pendant type wet sprinklers when the network is supplied by raw water sources. Return bends are also not necessary on wet systems that use a potable water supply.
There is insistence about their use for the reason that, black steel pipes would eventually corrode on the inside and...
The ducting from our Air Handling units goes all the way to the VAVs and from there to the diffusers. Each VAV serves about 4 diffusers in the rooms.
We are using Trane Company’s VARITRANE equal friction duct sizing software for the design. There are a couple of difficulties being encountered...
I am searching for the software to calculate hydraulically the pipe diameters of the firefighting network for extra hazard classification of the sprinkler system as per NFPA.
The sizing is to be calculated hydraulically and not by the Pipe Schedule System of NFPA.
In Chapter 13 of NFPA there is...
According to Pascal’s Law, the pressure inside a chamber that is full and pressurized with a fluid is constant.
Does this imply that the static pressure at the base of the pressurized chamber like a very tall column of pipe (in the vertical position) is the same as the static pressure measured...
We have a fire pump set consisting of one electrical pump and a jockey plus the Diesel Pump that has a 1 meter cube capacity fuel tank adjacent to it. There is no automatic fill option in the fuel tank.
Are we in violation of NFPA if the fuel tank has no automatic make up system, no sight glass...
Achieving the Desired Return Air quantities from occupied spaces.
The HVAC System consists of roof mounted Air Handling units for a single storey building that has many rooms. The system is designed for 20% fresh air and 80% return air that is achieved in the mixing box of the air handler.
The...
the underground Pump Room of our decorative fountains does not have an automatic submersible pump to de-water the underground pump room in the event of leakages from piping or adjacent water tank. Since there is electrical power and control panel in this underground installation, it could pose...
the performance of our chilled water pumps is attached.
• There are four pumps on duty (the pump selection and duty point performance is on page 1 of the attachment).
• We obtained readings of each pump with all the four pumps running. (Curve is on page 2 of the attachment).
• We also took the...
The Steam for humidification of supply air is injected in the supply Air Duct by a standalone humidifier at the Roof that is open to the Sun.
The maximum ambient temperature for the electronic controls of this humidifier as specified by the manufacturer is 40C.
The ambient temperature at the...
