Inlet gauge pressure

C = flow coefficient from Figures 2-17 or 2-18. Wren discharging to atmosphere, P = inlet gauge pressure. (Also see critical flow discussion.)... 

For example, for a line discharging a compressible fluid to atmosphere, the AP is the inlet gauge pressure or the difference between the absolute inlet pressure and atmospheric pressure absolute. When AP/Pi falls outside the limits of the K curves on the charts, sonic velocity occurs at the point of discharge or at some restriction within the pipe, and the limiting value for Y and AP must be determined from the tables on Figure 2-38A, and used in the velocity equation, Vj, above [3]. 

Y = net expansion factor from Figures 2-38A or 2-38B AP = differential pressure (equal to inlet gauge pressure when discharging to atmosphere)... 

Set pressure The inlet gauge pressure at which a PRV will start to open (or a rupture disk will burst) under service conditions of temperature and backpressure. 

This is the inlet gauge pressure at which the PRV is set to open under service conditions. The PRV set pressure shall be based on the following guidelines ... 

External fan pressure difference The difference between the total gauge pressure at the outlet of an air handling unit and the total gauge pressure at the inlet. 

The tank was used for storing a liquid product that melts at 97°C. It was therefore heated by a steam coil using steam at a gauge pressure of 100 psi (7 bar). At the time of the incident, the tank was almost empty and was being prepared to receive some product. The inlet line was being blown with compressed air to prove that it was clear—the normal procedure before filling the... 

The inlet valve was leaking, and during the two minutes that elapsed after the slip-plate was removed, enough fuel gas for an explosion leaked into the furnace. (Suppose the leak was equivalent to a 1.6-mm [ /(An.] diameter hole, and the gauge pressure of the fuel gas was 0.34 bar [5 psi]. The calculation shows that 80 L [3 ft-] of gas entered the furnace in two minutes. If this bunted in... 

Many operators find it hard to grasp the power of compressed air. Section 2.2 (a) describes how the end was blown off a pressure vessel, killing two men, because the vent was choked. Compressed air was being blown into the vessel, to prove that the inlet line was clear. It was estimated that the gauge pressure reached 20 psi (1.3 bar) when the burst occurred. The operators found it hard to believe that a pressure of only twenty pounds could do so much damage. Explosion experts had to be brought in to convince them that a chemical explosion had not occurred. 

P" is the inlet or average gauge pressure in potmds per square inch, and,... 

The inlet pressures listed in the table are gauge pressures the pressures used in the calculations of j and f are absolute pressures. Thus, atmospheric pressure had already been accounted for in the inlet pressure. The outlet pressure is taken as standard atmospheric pressure. As an example, for a measured gauge pressure of 137.9 kPa (20 psig), the ratio Pjabs/P0 is 2.361. The actual value of the atmospheric pressure will vary day to day, and with altitude thus if an exact value for j or f is desired, local pressure measurements must be made. 

The receiving tanks are vertical stainless pressure vessels equipped with pressure, temperature, and level gauges, pressure relief valve, inlet and outlet valves and fittings for liquid and C02 gas, a slow-moving propeller agitator, and a glycol jacket for cooling. 

To check this hypothesis, you bubble gas from the suspicious cylinder through 2.0 L of an aqueous NaOH solution (12.0 wt% NaOH. SG = 1.13) for exactly one hour. The inlet gas is metered at a gauge pressure of 510 mm H2O and a temperature of 2TC. Prior to entering the vessel, the gas passes through a flowmeter that indicates a flow rate of 2.00 L/min. At the conclusion of the experiment, a sample of the residual NaOH solution is analyzed and the results show that the NaOH content has been reduced by 23%. What is the concentration of CI2 in the cylinder gas (Assume the CI2 is completely consumed in the reaction CI2 + 2 NaOH NaCl -t- NaOQ + H2O.)... 

Most pneumatic conveyors operate under positive pressure, with a blower or compressor feeding air (or occasionally nitrogen) at 1 to 5 atm gauge pressure into the system. The ratio of solids to gas is usually higher than in vacuum systems. Sometimes the gas is recycled to the blower or compressor inlet in a closed system to save a valuable gas or prevent loss of dust to the atmosphere. 

This pressure is shown in Figure (7) calculated for various plate speeds with a constant fluid flow rate. To calculate the pressure on the plate a boundary condition of p = 0.0 at 0 was imposed as a reference pressure. This condition is frequently incorporated by assuming that the pressure at inlet is the same as the ambient (or zero gauge) pressure. The results shown in Figure (7) suggest that this assumption is generally false and that there is a difference between the inlet pressure (p = 0) and the pressure far upstream (considered as ambient). 

Figure 11 Schematic drawing of the circular-type pressurized ultramicro chamber (PUM chamber). I, water inlet 2, developing solvent inlet 3, pressure gauge 4, screw fastener 5. rubber O-ring 6. sorbent layer 7, support plate 8, plastic foil cushion system 9, polymethacrylate support blocks.

Figure 12 Schematic drawing of the CHROMPRES 25 chamber. I, chamber 2, eluent pump 3, safety valve 4, pressure gauge 5, solvent inlet valve 6, water outlet 7, plexiglass 8, solvent outlet pin 9, water inlet 10, pressure gauge 11, safety valve 12, water pump.

CS, cryostat system Gl, gas inlet P pressure-gauge port. Cl and CO coolant inlet and outlet (reprinted from Behringer and Arnold, 1983)... 

If the swirl flow number exceeds 0.5, the swirl is classified as a strong swirl. Strong swirl is associated with a low-pressure zone at the core. A strong swirl is associated with an important pressure drop. The cyclone feed gauge pressure at the inlet flange is often of the order of70-100 kPa (10 to 15 psi). 

Cold-wall type CVD set-up (1) water-cooled vacuum chamber (2), (7) quartz glass windows (3), (4) gas inlets (5) pressure gauge (6) water-cooled copper electrode (8) graphite heater (substrate) (9) graphite socket (10), (11) gas outlets. 

---