Pounds per Sq in gauge
To find the pressure at the inlet of the evaporator, you subtract the pressure drop from the low side pressure. Given a low side pressure of 15 psig and a pressure drop of 10 psig, the inlet pressure would be 15 psig - 10 psig = 5 psig. Therefore, the pressure at the inlet of the evaporator is 5 psig.
PSIG refers to pound/force per square inch gauge, while PSI measures the pressure relative to a vacuum. If you want to convert a figure from PSIG to PSI, you would need to add 14.7psi to your PSIG figure, which will give you your PSIA result.
10 psig
The saturation temperature of R-410A at 38 psig is approximately 18.5°C or 65.3°F.
There is no mathematical conversion needed - 1 psi is equal to 1 psi. The terms "psig" and "psi" are often used interchangeably to refer to pounds per square inch of pressure. However, "psig" specifically denotes pressure relative to the local atmospheric pressure, while "psi" is an absolute measure.
psia to psig psig - 15 15 - 15= 0 psig
psia=psig+atmospheric pressure where, atmospheric pressure = 14.7psi therefore psig=psia-atmospheric pressure psig=100-14.7 psig=85.3psig
the blowback or blowdown of the safety valve is at least 2 psi and for pressures over 100 psig is 2% of the popping pressure. The blowback is adjusted with the adjusting ring on the safety valve. The blowback is the pressure less than the popping pressure at which the safety valve will reset. Examples: a safety valve set to pop at 15 psig will reseat at 13 psig, the blowback is 2 psi. A safety valve set to pop at 250 psig will reseat at 245 psig the blowback is 5 psi or 2%.
70 psig
1 psig is equivalent to 51.71 mm (2 in) of mercury or to approx 700 mm (27.5 in) of water. Technically one cannot have apsig. Psig represents a pressure reading of the pressure above normal atmospheric pressure of 14.7 psi. You mean a psi.
You asked for black iron pipe ratings but below is an explanation for CARBON steel, which is much stronger. Iron and steel are not the same thing. The working pressure depends on the size of the pipe. These pressures are rated up to 400 degrees F. THESE RATINGS ARE FOR *CARBON STEEL*NOT BLACK IRON! Again, these pressures are maximum working pressures, not burst pressures. 1/4" 188psig 3/8" 203 psig 1/2" 214 psig 3/4" 217 psig 1" 226 psig 1-1/4" 229 psig 1-1/2" 231 psig 2" 230 psig The full table can be found here: http://www.engineeringtoolbox.com/astm-steel-pipes-working-pressure-d_775.html
psig
should be 2 to 3 psig
0.5 psig is equivalent to 13.8 inches of water column.
55 psig +15=70
50 psig is equivalent to 64.7 psi. To convert psig to psi, you simply add the atmospheric pressure at sea level, which is about 14.7 psi.
To find the pressure at the inlet of the evaporator, you subtract the pressure drop from the low side pressure. Given a low side pressure of 15 psig and a pressure drop of 10 psig, the inlet pressure would be 15 psig - 10 psig = 5 psig. Therefore, the pressure at the inlet of the evaporator is 5 psig.