Pressure in pipe 1

[rewatson]

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 fittings have an advantage over the standard welded fittings and valves?.

 

[bvi]

It depends upon your material of construction and the Code you are constructing it in accordance with. However, here is some info.

A rough guide to the pressure capacity of schedule pipe is to take the schedule number times the allowable stress for the material divided by 1000, to get an approximate pressure rating. So, assuming the allowable stress is 15000 to 20000 psi, schedule 40 is fine for 228 psig, neglecting corrosion allowance or mill tolerance. The margin is large enough so you are also more than likely fine even considering a nominal corrosion allowance and the pipe mill tolerance. Threaded and grooved pipe would have a lower pressure rating than stated above.

Regarding class, typical class 150 carbon steel (e.g. A105, A216 WCB, etc.) is good for 285 psi. So if it is typical carbon steel fittings, you would need to go to class 300 if you were 300 psi.

Regarding Victaulic and Anvil type fittings, they are easier for piping fabrication and erection and should therefore be a lower cost installation.