This standard specifies the types, parameters and main dimensions of mechanical seals for submersible electric pumps, model representation methods, technical requirements, test methods and inspection rules, installation and use requirements, etc. This standard applies to mechanical seals for submersible electric pumps. Its working parameters are: sealing medium pressure -0.05~0.5MPa, sealing medium temperature 0~80℃, rotation speed not more than 3000r/min, the medium is water, muddy water, oil and pH value of 6.5~8 sewage.