Cubic feet per hour

Fairfield Engineering Co. data in U.S. customary system. To convert cubic feet per hour to cubic meters per hour, multiply by 0.02832 to convert tons per hour to metric tons per hour, multiply by 0.9078 and to convert screw size in inches to the nearest screw size in centimeters, multiply by 2.5. 

The capacity of a valve as read from a manufacturer s table or chart is 45,000 cubic feet per hour oifree air (14.7 psia and 60°F). What is the capacity of the valve in terms of the vapors expected to pass through the valve under the rated conditions at the same setting If methanol is in the tank at 55°F... 

In general, the rate of deactivation was much lower at the lower fresh gas feed rate than at the higher feed rates. For example, the rate of deactivation was 0.022%/mscf/lb during the period between 600 and 800 hrs stream time at the lower feed rate of 206 standard cubic feet per hour (scfh) whereas it was 0.143%/mscf/lb for the period between 100 and 400 hrs when the fresh feed rate was about 386 scfh. 

Bench-Scale Reactor. The bench-scale reactor is 0.81 in. i.d. and 48 in. long. The nominal feed gas rate for this unit is 30 standard cubic feet per hour (scfh) the feed gas is supplied from premixed, high-pressure gas cylinders. Except for reaction temperature, the bench-scale unit is substantially manually operated and controlled. The catalysts used in these studies were standard commercial methanation catalysts ground to a 16-20 mesh size which is compatible with the small reactor diameter. 

For relatively low pressure drops, the effect of compressibility is negligible, and the general flow equation [Eq. (10-29)] applies. Introducing the conversion factors to give the flow rate in standard cubic feet per hour (scfh) and the density of air at standard conditions (1 atm, 520°R), this equation becomes... 

The desaiption of the apparatus has, of necessity, to be somewhat general, as these plants are made in sizes varying from 1500 to 60,000 cubic feet per hour production and consequently differ in detail thus, in large plants, the tube condenser is not employed and the hot hydrogen passes up a tower packed with coke, down... 

This variation in the efficiency of reduction, with pse of time, is clearly illustrated in the graph. Fig. g, hich shows the carbon monoxide and carbon dioxide jntent of the water gas after passing at the rate of 300 cubic feet per hour over 4 2 tons of iron oxide, sated to 750° C. 

Burning off can be accomplished by the admis-1 of air by the pipe (i i), the products passing out by pipe (18). The top of the plant is fitted with four ighted valves, one of which is shown at (14). The jsserschmitt plant is not in commercial employment this country, but it is considerably used both in rmany and in the United States, where the standard t contains about 5 tons of iron ore, with a production over 3000 cubic feet per hour. 

MMBtu/hr = million British thermal units per hour, scfli = standard cubic feet per hour. 

The space velocity is generally chosen to give conversions of 85 to 95% of the olefins charged. Higher conversions are possible, but uneconomical, as more catalyst is required and catalyst life is reduced. Space velocities, based on total feed, may range from about 0.3 to 0.5 gallon per hour per pound of catalyst or 4.5 to 7.0 cubic feet per hour per pound of catalyst, depending on olefin content of feed and other process variables. 

According to a report made by Hedley to Parliament, the illuminating power of coal-gas, in twelve principal districts of England, amounts to between 4-408 and 1 645 times that of a tallow candle—six to the pound hut ordinarily about two or three times, when the consumption varies from 2 3 to 1 5 cubic feet per hour, and the specific gravity from 0 58 to 0 412. 

The number of moles of gas compressed or the standard cubic feet per hour (SCFH) is constant. 

Diam. of Con- veyor, Inches A Mai. Lump Size, Inches Maximum Recommended rS m. Capacities, Cubic Feet Per Hour At Maximum At Recommend- One ed Speed JR.P.M. Maximum Capacities, Cubic Feet Per Hour ... 

Diam. of Con- Maximum Capacities, Cubic Feet Per Hour I Maximum Capacities, Cubic Feet Per Hour ... 

Despite these problems, PSA is often used for oxygen and hydrogen purification, and a recent runner-up Kirkpatrick Award for Union Carbide s Polybed hydrogen process (T ) attests to the fact that it is now both practical and economical to perform bulk separations on feed streams in excess of one million cubic feet per hour. 

Standard cubic feet per minute 60.00 Standard cubic feet per hour... 

Each cell takes about 390 amps, at a pressure of 2 61 volts, and the working temperature is 30° C. The purity of the oxygen is said to be 98 3. per cent., and each cell gives over 3 cubic feet per hour. 

In 1998 Praxair installed a small, on-site, hydrogen generating system at Kobelco Metal Powder of America in Seymour, Indiana. This generating system can produce 30,000 cubic feet per hour (800 cubic meters per hour) of 99.99% hydrogen189. 

The Gas Dispensing Tank. The gas dispensing tank (the body is shown in Fig. 6.6, the top is shown in Fig. 6.10) is designed to provide gas continuously at a delivery pressure between 75 to 175 psig. It can provide a continuous supply of 250-350 cfh (cubic feet per hour) with bursts of up to 1000 cfh. These tanks can... 

Other options for gas dispensing cryogenic tanks are manifolds that can connect two to six cylinders together. These manifolds can provide flow rates of 250 cfh (cubic feet per hour), can set up a reserve of gas for uninterrupted flow when changing cylinders, and (with an economizer circuit) can cut loss due to evaporation. For extra-high-capacity gas demands, there are external vaporizing manifolds, which are a combination of the external heat exchanger and manifold n... 

The U.S. Book on School Architecture allows only half tins amount, namely, 1000 cubic feet per hour for children. 

Nitrogen usually is produced by cryogenic air separation, liquefaction of atmospheric air, and removal of the nitrogen by distillation, as described earlier. Noncryogenic adsorption technology, including PSA and VSA systems, economically provides nitrogen for requirements between 4,000 and 30,000 standard cubic feet per hour (SCFH).9... 

Figure 5 shows the step currents from the power supplies and the resulting hydrogen flow in standard cubic feet per hour (scfh) from the system. Hydrogen production ripple is caused by the internal hydrogen phase separator pumping down the... 

Standard cubic feet per hour of reactable CO converted per lb Fe in reactor 10 12... 

FIG. 14-35 Transition from froth to spray regime for holes of various diameters. Values on curves are liquid loadings, mV(h m weir length). To convert cubic meters per hour-meter to cubic feet per hour-foot, multiply by 10.764 to convert (meters per second) (kilograms per cubic meter) to (feet per second) (pounds per cubic foot), multiply by 0.8197 and to convert millimeters to inches, multiply by 0.0394. [Loon, Pinczewski, and Fell, Trans. Inst. Chem. Eng., 51,374 (1973).]... 

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