Learn more about PASS/START-PROF pipe stress analysis software

ISO 5199 Pump Modeling

Model centrifugal pumps and verify nozzle loads per ISO 5199 requirements. Each pump object connects to one or two nodes. The software checks allowable loads for individual nozzles and the complete pump assembly.

View analysis results in the Nozzle and Equipment Loads Table. See also Nozzle Load Reduction Methods in PASS/START-PROF

Pump Modeling Approaches:

1. Nozzles at Pipe Terminations

Connect pump nozzles to pipe end nodes. The system automatically models pump nozzles as fixed anchors and simulates thermal expansion as anchor displacement.

2. Nozzles at Intermediate Locations

Connect pump nozzles to intermediate nodes. Manually construct the pump model using rigid elements, cylindrical shells, and other components. Model thermal expansion through element temperature properties.

Properties

 

Property

Description

Name

Element identifier. When enabled, displays in 3D view

Auto-calculate nozzle thermal movements

Automatically computes nozzle displacements as DX*α*(T-Ta), DY*α*(T-Ta), DZ*α*(T-Ta), where α is the thermal expansion coefficient (from material properties), T is equipment temperature, Ta is ambient temperature, and DX, DY, DZ are distances from pump center. Disable to specify manual displacements

Material

Material selection from materials database

Manufacturing technology

For ASME B31.1, ASME B31.3, DL/T 5366-2014, seamless pipe uses Wl=1.0. Electric-welded pipe Wl values come from database. Details...

For GOST 32388-2013, material properties are sourced from different databases based on pipe type (seamless/welded).

Temperature

Pump operating temperature. More information

This property varies by operating mode. Click to view values across all modes

Allowable Exceed Factor

Default: 1.4. Adjust per pump manufacturer specifications.

Pump type

Shaft direction

Shaft orientation relative to X-axis per equipment drawings:

Pump center point offsets

Reference node and XYZ offsets from node to pump center (point 3 in diagrams above)

Release restraints for spring hanger selection

When enabled, selected restraints are temporarily removed during variable/constant spring selection weight analysis. Restraints remain active during main analysis. This technique isolates weight loading from nozzle elements, allowing springs to support loads at zero displacement positions. Options:

  • Release vertical restraint - Only vertical direction released during spring selection

  • Release custom restraints - Manually select restraint directions to release

  • Release all restraints - All directional restraints released during spring selection

Suction nozzle

Discharge nozzle

Assign node connections for suction and discharge nozzles. Specify nozzle orientation (Top, Side, End). For unmodeled piping, select "Set Custom Loads" to manually input loads

Set loads

When modeling only one pump nozzle, apply manual loads to the second nozzle for ISO 5199 B.4.4 compliance checks. Enable this option to specify loads directly

Pump Allowable Load Verification

PASS/START-PROF checks nozzle loads against Table B.3 allowable values

The software performs additional verification per ISO 5199 section B.4.4 requirements

Menu and Toolbar Access

To insert a pump: Select target node and navigate to Insert > Equipment > Pump ISO 5199