Application of Dynamic pressure-balanced Seals in a Multi-stage Centrifugal Compressor
Abstract
Test results for an ASME Power Test Code 10 (PTC) Type 1 test of a 4,500 psia (310 Bara) discharge pressure gas lift centrifugal
compressor outfitted with dynamic pressure-balanced seals at the impeller eyes; shaft interstage and division wall locations are
presented and compared to the same testing with conventional labyrinth seals. Both aerodynamic performance and rotor dynamic
stability, obtained via operational modal analysis (OMA), are presented. A client’s motivation, along with the design and testing of
dynamic pressure-balanced (DPB) seals for turbomachinery are also presented in this paper.
With the DPB seals installed the test results indicate 2.8 percent lower power was required for the same head level across the entire
range of inlet flows and pressure ratios, when compared to the same testing with conventional labyrinth seals. Rotordynamic stability,
obtained via operational modal analysis (OMA), showed the dynamic pressure-balanced (DPB) seals exhibited log decs similar to
standard labyrinth seals across the entire range of flows and pressure ratios. The foregoing demonstrates both the aerodynamic and
mechanical/rotordynamic integrity of the dynamic pressure-balanced seals for oil and gas, turbomachinery applications.
Description
LecturesCollections
Citation
Stiles, David; Justak, John; Kuzdzal, Mark; Miller, Harry; Sandberg, Mark; Rohrs, Charles (2018). Application of Dynamic pressure-balanced Seals in a Multi-stage Centrifugal Compressor. Turbomachinery Laboratory, Texas A&M Engineering Experiment Station. Available electronically from https : / /hdl .handle .net /1969 .1 /172519.