S-86 Gas Booster Selection & Performance Data

In general, an air or gas charging application requires a specific volume to be brought to a specific pressure within a given amount of time. The adjacent tables will assist you in selecting the most efficient ratio Sprague booster for your application requirements.

A typical hose pressure testing application:

  1. Hose with one cubic foot volume is to be pressure tested at 500 psig. Pressure level is to be reached in three minutes. Available shop air is 150 psi.
  2. Using Table 1, Low Pressure Gas Boosters Performance, page 46, find the required receiver pressure of 500 psi. Compare the figures found in the 500 psi discharge pressure column to the desired time of three minutes. The column figures nearest to three minutes is 2 minutes, 45 seconds with a discharge rate of 4.4 standard cubic feet per minute. So, the 5:1 ratio booster will do this job more efficiently than a 15:1 ratio booster.
  3. Note that the booster driving air pressure and above calculations are based on 100 psi, so the shop air pressure of 150 psi must be reduced to 100 psi driving air to operate the booster. Shop air of 150 psi should still be supplied to the inlet port of the compressing portion of the booster. The higher the precharge inlet pressure, the faster the discharge outlet pressure will be reached.
  4. For the above hose test, the S-86-JN-5 booster or S-486-JN-5 booster power unit could be used (See pages 47 & 48).

S-86 Selection

S-86 Performance Data

Low Pressure Gas Boosters Performance (approximate performance based on air consumption of 80 SCFM)

High Pressure Gas Boosters Performance (approximate performance based on air consumption of 80 SCFM)


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