There is an issue regarding schedule for fittings in Specification driven piping.
1. Changing Pipe SIZE - OK.
Example for a 90 Bend fitting .ptd file:
"SCH_RATE" "SIZE" "NSIZE" "BSIZE" "END_TYPE" "NEND_TYPE" "FITT_MODEL_NAME" "WEIGHT"
"40" "2" "" "" "BW" "" "N004E0504-P281"
"80" "6" "" "" "BW" "" "N004E0801-P281"
This .ptd file works fine and when you change the pipe size from 2 to 6 in the 3D model, then the fitting (90 Bend) is automatically replaced from fitting file N004E0504-P281 to N004E0801-P281
2. Changing Pipe SCH_RATE but having same pipe SIZE - NOT OK
This behavior should also work if you only change the SCH_RATE but have same pipe size.
Example is a Sweepoflange (Olet fitting):
"SCH_RATE" "SIZE" "NSIZE" "BSIZE" "END_TYPE" "NEND_TYPE" "FITT_MODEL_NAME" "WEIGHT"
"140" "2" "12" "BW" "FLGR" "N021B1104-P888"
"120" "2" "16" "BW" "FLGR" "N021B1303-P888"
SCH_RATE is basically the wall thickness of pipe&fittings. The example doesn't work properly in the 3D model, when you switch the pipeline, it changes automatically which is correct. The Pipeline changes from SCH_RATE=120 & SIZE=2 to SCH_RATE=140 & SIZE=2. but the fitting is not replaced.
The fitting should also be replaced because it has another wall thickness which is related to the SCH_RATE.
This is a major concern and I think this needs to be updated to work properly.
There is a PTC case that I created for this issue: C12433195
