How Bores Are Output

Although all pipe bores are stored in the PDMS databases in mm, they may be input and output in either metric or imperial units. The program converts from one set of units to the other by applying the factor 25.4 mm/inch.

PDMS holds tables of standard nominal bore pipe sizes and, unless specified otherwise, compares each actual bore against the values in the appropriate (metric or imperial) table. If the actual bore falls within a predefined tolerance of one of the nominal bores, it is assumed that the standard sized pipe is suitable and so that nominal bore is output.

You may specify whether component bores within the Specification data are to be output as actual or nominal sizes by using the command syntax

BOREs ACTual

BOREs NOMinal

The default is BORES NOMINAL.

Note: RADI and HEIG questions use the current Distance unit.

Nominal Pipe Size Tables contains the tables used by PDMS to define metric and imperial pipe sizes.