IS 3133 : 1989 Manhole and inspection openings for chemical equipment - General requirements
UDC 66.025.4 | MED 17 |
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Reaffirmed 2020 |
1 Scope
1.1 This standard covers manhole, handhole and inspection holeopenings in chemical equipment and in mobile tanks for chemicals.It does not apply to openings in steam generating plant.