MOM is the abbreviation of the Ministry of Manpower of Singapore. All pressure-bearing equipment manufactured or imported for use in Singapore must be certified by an authorized third-party inspection agency as the "inspection agency" of the Ministry of Occupational Safety and Health (MOM) for the design, manufacturing and inspection processes.
Domestic manufacturers can design in accordance with relevant standards of developed countries such as ASME codes or EN standards (which must be signed and approved by overseas authorized inspection institutions), but as far as we know at present, products designed in accordance with ASME standards are relatively easy to pass MOM approval.