Use this calculator for predictive wear life analysis for rotary manifold sealing systems.
UEA Tools | Rotary Seal Life Estimator Calculator
Disclaimer: UEA does not guarantee the accuracy of these calculations and accepts no liability for errors or omissions. Calculations are provided for informational purposes only and may not be fully accurate.
Rotary Seal Life Estimator
Predictive wear life analysis for rotary manifold sealing systems
Standard
ISO 6194 / ANSI B93 / RMA OS-1
Method
Speed/Pressure Limits + Archard Wear Model
Accuracy
±25–40% typical estimate
01
Operating Conditions
REQUIRED
inches
Shaft OD at the sealing contact face
RPM
Continuous operating speed
PSI
Max continuous working pressure
Fluid provides lubrication film — affects wear rate and material compatibility
°F
Normal operating temperature at the seal face
hrs/day
Excavator upper structure rotates during dig cycle only. Typical rotation duty 30–40% of machine hours. ~1,800 machine hrs/yr on active construction site.
%
% of machine hours swivel is actually rotating
hrs/yr
Total machine operating hours per year
02
Seal Type & Material
REQUIRED
Energized PTFE cap seal — industry standard for high-pressure rotary manifolds. Rated to 5000 PSI. Low friction due to PTFE. O-ring energizer maintains lip contact at all pressures.
Material drives wear rate, temperature limit, chemical compatibility, and maximum speed. PTFE-based materials are standard for high-pressure rotary manifold service.
in
Axial width of seal cross-section. Cap seal standard: 0.188 in (4.78 mm). O-ring: use cord diameter.
%
Cap seal: 8–12% | O-ring dynamic: 10–15% | U-cup: 12–20% | Lip seal: 5–10%
03
Shaft Surface & Coating
CRITICAL
Surface finish is one of the highest-impact variables — Ra directly affects lubrication film thickness and abrasion rate
Shaft lead (machining spiral) pumps fluid past the seal — significantly reduces life on lip and U-cup seals
Harder shaft surface dramatically extends seal life by reducing abrasive wear on the seal lip
HRC (override)
Leave blank to use the value from coating selection above. Enter a value to override.
in TIR
Total Indicator Runout at seal location. Exceeding 0.003 in TIR significantly reduces seal life and causes dynamic lip loading.
in diametral
Diametral clearance between rotor OD and stator bore at the seal groove. Smaller e-gap = higher pressure capacity. Typical precision fit: 0.001–0.003 in. Cap seals are more tolerant of larger e-gaps than elastomeric seals.
E-Gap Pressure Capacity Guide
≤ 0.001 in → 100% rated pressure
0.002 in → 90–97% rated pressure
0.003 in → 75–92% rated pressure
0.005 in → 55–82% rated pressure
0.008 in → 35–68% rated pressure
Cap seals tolerate larger gaps than O-rings / U-cups
0.002 in → 90–97% rated pressure
0.003 in → 75–92% rated pressure
0.005 in → 55–82% rated pressure
0.008 in → 35–68% rated pressure
Cap seals tolerate larger gaps than O-rings / U-cups
Seal Life Results
Enter operating parameters
and click Calculate