Sour gas consisting mainly of methane (CH4) but with 2% hydrogen sulfide (H2S) is routed to an amine absorber section for sweetening. The absorber uses a 25:75 diethanolamine (amine)/water solution to remove the H2S in the absorber tower. Sweet gas is removed from the tower top and routed to fuel gas. Rich amine is pressurized from the tower bottom under level control and then routed to an amine regeneration unit on another plot. Regenerated amine is returned to the amine absorber section and stored in a low-pressure buffer storage tank.