Applies To
Product(s):	AutoPIPE
Version(s):	ALL;
Area:	Modeling
Original Author:	Bentley Technical Support Group
Date Logged & Current Version	March. 2017 11.00.00.22

Problem:

How to model an Angle valve (90 deg valve) in AutoPIPE?

Solution:

Answer: Generally the vent pipe will always be bigger. There is currently 2 modeling approaches for an angle valve or relief valve:

Option #1: Model as a single valve on an incline:

Please see the following AutoPIPE help section:

Help > Contents> Contents Tab> Modeling Approaches> Modeling Approaches> Valves> Relief and Angle Valves

Note: Although AutoPIPE cannot model a C.G. that is not outside the valve, AutoPIPE 9.1.1. and higher can model a valve actuator at any orientation you wish and if that location corresponds to the location of the CG that would give a similar response.

Option #2: Modeled as two valves:

model part of the valve in one direction with one pipe size and model the 2nd valve at 90 degrees with second pipe size.

Note that the valves would be modeled on the same segment as non-standard so that the weight is not automatically assigned. You can proportion the weight as you wish. the last step is to configure the correct end connections. May need to use "Joint Type and User SIF " command to enter the correct end connections. The end connections between the valves does not mater as much as the piping connections (ex. A01 and A03). Consider overriding the SIF with 1.00 at the junction between the valves.

Difference between the two model approaches:

Not to be concerned, but analysis does show a very small difference in the results. This is due to the different type of construction, center of gravity; 1 valve at an angle vs 2 valves perpendicular.

The following warning may appear in the model consistency check:

W726-7: Pipe diameter change without a reducer at point XXX

However, this is an acceptable warning to ignore because in order to model this component different pipe sizes were used without a reducer in both cases.

The following enhancement has been logged (98521 - 139059), Add new valve type library for Press Safety / Relief Valve (PSV or PRV).

04. How to model an Angle / PSV valve (90 deg valve) in AutoPIPE?

Problem:

Solution:

Option #1: Model as a single valve on an incline:

Option #2: Modeled as two valves:

Difference between the two model approaches:

See Also