<nozzle takeoff rule set> ::=
(FROM <equipment class> <nozzle takeoff rule>* )
- The ordered list of rules for an equipment class. The nozzles are
matched in order, taking the first match; therefore, more specific rules should
precede more general rules.
- There need not be any rules--the default rule is to just use the
minimum distance.
<nozzle takeoff rule> ::=
[WHEN <expression>][ALWAYS] <segment> [AND <segment>]*
- ALWAYS indicates that the vicinity clause should be obeyed, even
if it will result in a routing interference.
<segment> ::= GO <distance direction> <distance> |
GO <location direction> TO <level> |
GO TO CHANNEL |
GO TO VERTICAL-CHANNEL
- The first choice indicates that the pipe should route in the
specified
<distance> in the specified
<direction>.
- The second choice indicates that the pipe should route in the
specified
<direction> to the specified routing level,
absolute elevation, etc.
- The third choice indicates that the pipe should route to the
equipment-specific horizontal channel corresponding to this nozzle.
- The fourth choice means go to the equipment-specific vertical
channel corresponding to this nozzle.
<distance direction> ::= left | right | back | front |
up | down | north | south | east | west |
nozzle-direction | to-pipeway | perpendicular-to-nozzle
- Right, left, front, and back are interpreted relative to the
equipment axis.
- Perpendicular-to-nozzle is primarily used for equipment header lines
with inline nozzles (including diverging and converging) to get outside the
equipment space.
- The chosen direction is toward the other end of the connected pipe
along one of the axes.
<location direction> ::= up | down | vertically
<distance> ::= <expression> | minimum-length
<minimum-length> ::= the length of two elbows
<level> ::= <expression> | any-level | parallel-to-pipeway-level |
perpendicular-to-pipeway-level |
nozzle-direction | perpendicular-to-nozzle |left |
right | left-right | back | front | front-back |north |
south | north-south | east | west | east-west
- Level defines a pipeway level with routing parallel to the given
direction.
- Any-level means the first routing level in that direction.
