How does AutoList decide what order to list piping in?
Here are the general listing rules that pertain to the order:
- Welded piping (whether lines or mains) lists before Threaded piping
- Welded piping is listed in alphanumeric order (specifically, the ASCII order)
Per the ASCII order, numbers list before letters. Punctuation marks, including spaces “ “ list before either (because spaces come before numbers in the ASCII chart).
You want the mains to list first, then the welded lines and then the riser nipples.
Label accordingly using this scheme:
Label the Mains as such “ A”, “ B”, “ C” etc. notice the SPACE before each letter in those three examples. This forces the mains to list first.
Label the welded lines using a letter before a number, such as “L1”, “L2”, “L3”, etc.
Label the riser nipples using a letter before a number, ensuring the letter(s) used come after the letters used on the welded lines (RN comes after L), such as “RN1”, “RN2”, “RN3”, etc.
From the manual:
“Tagged welded piping always lists before tagged threaded piping. Within either type of fabrication, the naming of the tag further determines the order of listing. Numbered tags list before lettered tags. Lower numbered tags list before higher numbered ones (1 before 2). Likewise, lower lettered tags list before higher lettered ones (A before B). A space before a letter or number will make that tag take precedence over all others. A general rule worth following is to name the mains the lowest, the riser nipples higher and the lines the highest. Always use a space before a main identifier, and you shouldn’t have any problems.”
I will soon be posting about what rules apply to listing in general, as the order is only part of it….
The H-Factor 
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