Read about START-PROF pipe stress analysis software
This element allows to model the turbine and check the loads according to NEMA SM 23 /API 611 / API 612 / ISO 10437 standards. One "turbine" object can be connected to 2-4 nodes. Allowable loads are checked for each individual nozzle and for whole turbine. Analysis results can be found in Loads on Nozzles and Equipment Table. See also "How to Reduce the Nozzle Loads in START-PROF"
There can be two options of using turbine element:
1. Put turbine nozzles into the pipe end nodes. In this case, the turbine nozzles are automatically modeled as a fixed anchors. Turbine temperature expansions are automatically modeled as anchor movements.
2. Put turbine nozzles into intermediate nodes. In this case user should create the turbine model using rigid elements, cylindrical shells, and other elements. Temperature expansion are modeled as temperature expansions of elements, that model the turbine (rigid elements, pipes etc.)
Property |
Description |
Name |
Element name. If checked then it shown in 3D view |
Auto calculation of nozzle temperature movements |
Automatically calculate the nozzle movements as DX*Alpha*(T-Ta), DY*Alpha*(T-Ta), DZ*Alpha*(T-Ta), where Alpha is thermal expansion factor (taken from selected material properties), T is equipment temperature, Ta is ambient temperature, DX, DY, DZ are distances from turbine center. If checkbox is not checked, then nozzle movements can be specified manually |
Material |
Material from materials database |
Manufacturing technology |
For ASME B31.1, ASME B31.3, DL/T 5366-2014 seamless pipe will always use Wl=1.0. For electric-welded pipe Wl will be specified from database. More... When using GOST 32388-2013, pipe physical properties are taken from different materials databases depending on pipe type (seamless/welded). |
Temperature |
Turbine Temperature. More... This property can be changed in different operation modes. To see the value of this property in all operating modes push the button |
Factor for Allowable Loads |
The default value is 1.0. Allowable values are 0.5-20.0. You can change this value according to turbine manufacturer instructions. The allowable loads De and Dc will be multiplied by this value. |
Fshaft Direction |
Fshaft X-axis direction according to following drawings: |
Turbine Center Point Offsets |
The node, and offsets from this node to the turbine centre (point 3 on the drawings above) |
Remove restraints for hanger selection |
If this option is activated, then some restraints are removed from nozzle element during weight run of variable and constant spring selection. During main analysis restraints are working. This trick allows to remove the weight part of loading from the nozzle element. Springs will take the exact load, at which displacements from pure weight load is zero. Options:
|
Suction Nozzle Discharge Nozzle Additional Nozzle 1 Additional Nozzle 2 |
Set the node number to which nozzles are connected to. If other side piping model is absent, you can specify the loads manually, just select "Set Custom Loads" |
According to API 617 standard the load on each nozzle of turbine shouldn't exceed
Sum of loads of whole turbine shouldn't exceed
To insert a turbine, select the desired nodes and use the menu option: Insert > Equipment > Turbine NEMA SM 23/API 611/API 612