Compressors metallic diaphragm

Metallic Diaphragm Compressors (Fig. 10-99) These are available for small quantities [up to about 17 mvh (10 ftVmin)] for compression ratios as high as 10 I per stage. Temperature rise is not a... 

The diaphragm compressor (Fig. 4.1.35), one of the oldest leak-free process machines, is limited to lower power (< 100 kW) because sensitive metal diaphragms must be used due to the high compression temperatures and pressures. Its applications include laboratories, pilot installations, and special production facilities. An attractive feature is their very high pressure-ratio (up to 20) produced by a single stage as a result of the small dead-space and good cool-... 

Additional equipment includes the manifold pressure regulator (MPR), Matheson Model no. 3-580 the inlet pressure regulator (IPR), Matheson Model no. 3075-1/4 the back-pressure regulator (BPR), Grove Valve Co s model no. 155 per Figure no. 11410-F-P2-A and the Corblin A1C-250 metal-diaphragm compressor, serial no. 1430. 

The fundamental problem in the design of this diaphragm compressor involves the diaphragm itself. Not only must it provide for complete separation of the oil and gas over the entire operating life of the unit, but it must also respond exactly to the pulsations of the oil pressure at the speed required and transform them into gas flow and pres sure. Compressors of this type with metallic diaphragms have been used successfully for some time in the chemical industry in gas purification systems. The compressor described herein is similar in principle to these in that metallic diaphragms are used. However, due to the miniaturization required in air-borne applications, the design of the cavity is extremely critical from a displacement point of view in order to meet the flow rate requirements of the closed system. 

All the problems associated with chlorine compression apply to diaphragm compressors. They must be protected against combustion of metal parts in dry chlorine. Since the compressor head usually is carbon steel, this means a maximum temperature of about 120°C. There must be no contact between chlorine and a combustible lubricant. Double separation between the two, as was the case with reciprocating compressors, can prevent this contact. Two diaphragms with an inert intermediate fluid are standard. The oil can be a chlorinated fluorocarbon that does not react with chlorine. The space between diaphragms should have a leak detector that sounds an alarm and shuts down the compressor when either diaphragm fails. 

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