Catalogues and Specifications
Reference Manual
Piping Components
:
Special Components
: Mitred Bends
Mitred Bends
Mitred Bends are essentially piping components fabricated from tube cut at angles and welded together. Prior to version 12.0 of PDMS, these components were catalogue components with a complex geometry set. Although the bend shown appears to have a square end, the tube lengths are calculated to the longest side of the cuts and the start and end segments are treated as part of the arrive and leave tube for material purposes. These two end parts are deemed as virtual segments in AVEVA E3D™ because they don't cut the pipe at P1 and P2
To enable this more intelligent use of mitred bends, a default geometry set has been built in to AVEVA E3D™ for conventional mitred bend types. The default geometry set is used in a similar way to tube where a default geometry set is used if the component GTYP is a BEND and the geometry reference is unset.
A bend pointset is required to define arrive and leave points with P1 and P2 defined and positioned by either parameters or DDANGLE and DDRADIUS. The same pointset will be applicable if it is a pulled or mitred bend.
In the design database, a BEND element now has a new attribute NCUTS which determines how many cuts to apply to each bend. This is only used if the bend has no geometry set, so existing bends will be unaffected. Any bends with NCUTS set to zero or less will be treated as a pulled bend. The default value for NCUTS is 0.
Pipe Bore, Connection type and PPOINT positions are all required to enable connection between components. Additionally a pipe outside diameter is required to enable the component size to be determined. Like implied tube, the order in which these parameters are built is important and should be as follows:
Parameter 1 Nominal Bore
Parameter 2 Outside Diameter
Parameter 3 Connection Type
Parameter 4 default NCUTS
Parameter 5 onwards may be used for any other purpose but will not affect the geometry
1974 to current year.
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