Selecting from Several Alternatives

Model Reference Manual

The SELECT command chooses a Component and Leave Tube from the Specification and sets the appropriate current element attributes. In order to make a Selection from the Specification, parameters for all the Specification Headings for that type of Component must be automatically obtained or provided by the designer. In many cases, the default choice may not be suitable. This may be because:

•

One or more of the Specification Headings has no default parameter for that Component (e.g. the Leave bore of a Reducer cannot be assumed)

•

The user wishes to choose a non-default item (e.g. socket weld, not a weld-neck)

In both instances, the designer must specify the relevant Headings with the required Entry as part of the SELECT command.

After a successful SELECT command, the design attributes will be updated with the relevant values from the Specification. The relevant attributes are ANGLE, RADIUS and SHOP, and HEIGHT if specified in the SELECT command.


Examples:
SELECT	The default Component and Leave Tube will be selected from the Branch Specification. The Current Element SPREF and LSTU attributes will be set to the chosen Specification Component names.
SEL WI STYPE BALL	The current element and Leave Tube will be selected using the default choices except for the STYPE Heading which has been specified.
SEL WI STYPE ECC PBOR 2 50	The current element and Leave Tube will be selected using the default choice except for the Headings specified. (If the Component LEAVE is 2, then the Leave Tube will also be 50 bore.
SEL WI ANGLE 45	The current element and Leave Tube will be selected using the default choice except for the ANGLE heading. Also, the ANGLE attribute of the Current Component will be set to 45. (Similar behaviour occurs with HEIGHT and RADIUS.)
SEL WI LBOR 50	The current element will be selected using the default choice. However the Leave p-point and Leave Tube will be selected with the specified nominal bore.

Command Syntax:

                    .------<-------.
                   /               |
>-- SElect WIth --*-- SPec <gid> --|
                  |                |
                  |-- <wivl> ------|
                  |                |
                  |-- <wiwor> -----’
                  |
                  ‘-->

For Selection criteria that are only in the Specification, the Specification itself may also contain information to assist default Selection. This information is in the Default Line of the Specification.

Querying:

>-- Query --+-- SPRef --.
            |           |
            ‘-- TUbe ---+-->

                        .-----<-----. 
                       /            |
>-- Q SPECification --*-- <qspci> --+-->

where <qspci> is:

>--+-- PBOre integer --.
   |                   |
   |-- ANgle ----------|
   |                   |
   |-- RAdius ---------|
   |                   |
   |-- ABOre ----------|
   |                   |
   |-- LBOre ----------|
   |                   |
   |-- PREssure -------|
   |                   |
   |-- TEMperature ----|
   |                   |
   |-- RATing ---------|
   |                   |
   |-- STYpe ----------|
   |                   |
   |-- TYpe -----------|
   |                   |
   |-- PCOnn integer --|
   |                   |
   |-- ACOnn ----------|
   |                   |
   |-- LCOnn ----------|
   |                   |
   ‘-- word -----------+-->