Catalogues and Specifications
Reference Manual
Specification Constructor
: How Component Selection Works
How Component Selection Works
This section explains how the tabulated Specification (SPEC) data is used to choose an appropriate piping component from the complete catalogue. Similar principles apply to structural components and equipment nozzles, although for these you may also use the catalogue without a Specification.
The SELEC elements are generated automatically from the tabular SPECON input for a given SPEC and hold all information about those attributes of a component which determine its availability for a given purpose. For any given set of design criteria, the route through the SELECtors follows a ‘question and answer’ sequence to determine which SPCOM is suitable. Each question relates to a specific item in the specification and each answer leads to the next relevant question in a logical progression. Any given combination of answers should correspond to one, and only one, SPCOM.
The attribute QUES on the owning SPEC or SELE element an attribute QUES stores the question. The owned SELE or SPCO elements have an attribute ANSW that supplies its particular answer. The first SELE or SPCO that provides a matching answer is then accepted as the next element, and if it is a SPCO the search terminates, and if it is a SELE a new QUEStion is asked.
The types of information considered by the QUESTions at the SELEC decision points for AVEVA E3D™ piping components might include:
Text or specific words:
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Generic type; for example, BEND, TEE, VALV etc.
Values of Physical quantities
•
Bore(s)
•
Angle(s) between multiple inlets/outlets and so on.
Numbers (such as counts in a multiway)
1974 to current year.
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