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How to model a pipe Strainer / Filter in Basket or Y-type configuration with AutoPIPE?
Simply stated, a Strainer is also a filter, the only difference being is that a Strainer removes larger particals where a filter removes smaller finer particals.
In essence both of these devices are model in similar ways using the procedure below:
Example #1: insert a 1.5 ft long filter / strainer starting at node point B05, the weight of the strainer is 100 lbs, and weight of contents in strainer is 50 lbs. Flange connections are 300# rating. For analysis purpose, model has 4 Temperature / Pressure Load cases to be consider for design.
a. Set current node point to B05
b. Insert Slip-on flange set, 300# rating. "Insert Matting Flange" enabled
c. Insert Run, Length = 9", creating B06
d. Insert Run, Length = 9", creating B07
e. Insert Slip-on flange set, 300#.rating, "Insert Matting Flange" enabled
f. Select Node points B05 - B07, Insert > Rigid Options over Range, Include Weight = Disabled, Include Thermal Exp.= Enabled
f. Enter weight of Strainer / Filter
Select node point B06, Insert> Xtra Data> Additional Weight, vertical Dy = -100 lbs
Notes:
1. AutoPIPE calculates the content weight of an typical piping component by multiplying: (inner pipe diameter) x (length of component) x (Pipe Property Specific Gravity) x (Analysis Set Density Factor [default=1]).
2. With inserting "Rigid Options over Range" in step above, the total weight of the component + contents were removed from that section of piping:
3. Weight is only applied during the Gravity load case
4. Another modeling approach would be to consider the weight as a distributed load.
g. Enter Strainer / Filter contents weight
Suggest to account for contents weight by selecting node point B06, Insert> Xtra Data> Additional Weight, vertical Dy = -50 lbs
Note: another modeling option would to consider the contents as a distributed load case.
Finished modeling of Filter / Strainer
Modeling a Filter or Strainer component are fairly similar; model 2 sets of flanges on a section of piping to represent the Filter / Strainer body, insert rigid options over length (ignoring weight while considering thermal expansion), add a weight for Filter / Strainer body at the mid point, and add another weight at the same mid point for weight of Filter / Strainer contents.
This modeling approach does not automatically remove the contents weight of the Filter / Strainer if the "Contents " option is disabled in an analysis set. Remember, If one wants to run an analysis that does not consider weight of contents than delete the weight value from step G above before running an analysis. And, reapply this weight value when contents are to be considered in an analysis.
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