INSTRUMENTATION taining carbon particlesinsuspension. The inlet, gas, is selected through inlet block valves which arc forged steel with asbestos-graphite packings. The gas enters a knockout cooler where it bubbles through water, and passes through a sprayed packed column to remove particles carried by bubbles and to provide further cooling. T h e gas stream emerges at 100° F., the temperature being controlled by varying the amount of water to the knockout cooler. T h e level of the knockout cooler is con trolled by a ball-float trap, while overheating is avoided by the use of a pressure switch which shuts off" the air-operated inlet valves. The cooled gas is then let down in pressure from 400 to 50 p.s.i. A relief valve set at 100 p.s.i. is installed at the 50-p.s.i. line to pro tect the next let-down valve body which is rated at 100 p.s.i. A vent from the 50-p.s.i. line provides in creased flow, thus reducing time lag. The next regulating valve lets down gas pressure to 10 incites of water. The gas passes through a fine filter, drier needle valve, flowmeter, and then on to the analyzer. T h e flowmeter and pressure indicator are kept at constant values during both sampling and calibrating pe riods. The calibrating gas is directed to the upstream side of the lowpressure regulating valve at about 55 p.s.i. T h e calibrating gas then travels the same route to the analyzer as the sample gas. Provisions for purging the lines with nitrogen to remove traces of carbon monoxide are made to reduce hazards before maintenance is carried out.
HIGHPRESSURE FLOWS
BROOKS CAN METER THEM AS H I G H A S 1 0 0 , 0 0 0 P S I ! Brooks rotameters work well under pressure. Right n o w there are several operating around the clock at 40,000 psi, in process lines ranging from Vz to 2 inches. Operation has been very satisfactory. Even on heavily pulsating flows. (The meters have built-in provision for pulsation damping. It is simple. A n d very effective.) • Brooks high-pressure meters can be supplied with either electric or pneumatic trans mitting extensions. Both are compatible with most receiving instruments. Both use the Brooks magnetic position converter, the most reliable transducer of its kind. • If you have a high-pressure metering job, ask us about it. W e c a n probably give you exactly what you need. And at a price somewhat lower than you'd expect to pay. Design BROOKS INSTRUMENT CO., INC. Specification Sheet 3613 will 5603 W. VINE ST. · HATFIELD · PENNSYLVANIA give you more information. Brooks Instrument Canada Limited, Scarborough, Canada · Brooks Instrument Company, S. Α., Fribourg, Switzerland · Brooks Instrument Nederland, N. V., Veenendaal, Netherlands SA 2 3 6 0 Circle No. 58 on Readers' Service Card 62 A
INDUSTRIAL AND ENGINEERING CHEMISTRY
The whole analytical installation, including two analyzers and two sampling systems, is contained in a temperature-controlled hut. T h e installation has given good service and present provisions for main tenance have proved adequate.
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