Shell Oil Comapny

Stephen G Bryce

Christopher Morley

Leslie C Shirvill

An apparatus (1) is provided for compressing gas, the apparatus comprising a conduit (3) provided with a non-return inlet valve (10) arranged at the upstream inlet (5) end of the conduit (3), a localized ignition source (20) arranged in the conduit (3) downstream of the non-return inlet valve (10), and means (23) for intermittently supplying secondary fluid into the conduit (3) between the non-return inlet valve (10) and the localized ignition source (20).

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Chester, United Kingdom

Stephen G Bryce