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3.3 Piping Spacing
3.3.1 The clearance between the piping installed on pipe sleepers or piperacks shall not be less than 50mm，and the clearance between the outer edge of flange and its adjacent piping shall not be less than 25mm.
The clearance between the piping installed in pipe trenches shall not be less than 80mm，and the clearance between the outer edge of flange and its adjacent piping shall not be less than 50mm.
3.3.2 For piping installed with large size fittings，small equipment or instrument measuring elements or designed for lateral movement，the clearance between such piping shall be properly increased.
3.3.3 The clearance from piping to the columns of piperacks or structures，building wall or pipe trench wall shall not be less than 100mm.