FIELD: lighter-than-air flying vehicles. SUBSTANCE: semi-rigid airship envelope has upper and lower compartments divided by membrane bulkheads at different gas permeability intended for selective separation of natural gas into components in according with sizes of molecules of respective gas. Fitted on lower compartment are delivery and exhaust pipe unions; upper compartments are provided with exhaust pipe unions. Polycomponent natural gas in form mixture of light gases and fuel gas is cleaned from solid and liquid admixtures at gas fields; mixture is pumped into lower compartment of airship envelope in such way that light gases are evacuated in upper compartments and fuel gas is retained in lower compartment. Light gases are pumped out of upper compartments leaving such amount of light gas in the highest compartment which is required for use as carrier gas; amount of fuel gas in lower compartment shall be sufficient for engine plant of airship. EFFECT: low cost of finished product. 3 cl, 3 dwg, 1 tbl
