BS EN ISO 21049. Pumps. Shaft-sealing systems for centrifugal & rotary pumps Centrifugal pumps, Rotary pumps, Pumps, Sealing processes, Seals, Mechanical components, Chemical industry, Gas technology, Petroleum technology, Fluid equipment, Drilling (mineral extraction), Extraction (minerals), Dangerous materials, Flammable materials, Toxic materials, Reliability, Air pollution, Pollution control