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Use Assign menu>Pipe>Pipe Property set, click on 14"STD and press OK or Apply to change the header pipe size as shown. If you haven't already defined the pipe property set, use Define>Pipe sections and Define>Pipe property sets to add it.
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Use Assign menu>Pipe>Pipe Property set, click on 14"STD and press OK or Apply to change the header pipe size as shown. If you haven't already defined the pipe property set, use Define>Pipe sections and Define>Pipe property sets to add it.