Detection Service for Labyrinth Seals for Global Rotating Equipment Markets
As an ISO/IEC 17025 accredited laboratory, we deliver a precise detection service for labyrinth seals that verifies dimensional accuracy, material integrity, surface condition, leakage performance, and assembly compliance. Our detection service for labyrinth seals supports manufacturers and exporters of steam turbine seals, compressor seals, pump wear rings, and bearing isolators who must demonstrate conformity to API 617, API 682, ISO 13349, and regional rotating equipment standards across the European Union, North America, the Middle East, and Asia. Every inspection is conducted under our CNAS-accredited quality system, producing reports accepted by notified bodies, equipment OEMs, and procurement teams worldwide.
Product Samples We Regularly Test in Our Detection Service for Labyrinth Seals
- Interlocking labyrinth seal rings for steam and gas turbines — high-low and straight-through tooth profiles in carbon steel, stainless steel, and nickel alloys
- Labyrinth seals for centrifugal compressors — abradable and non-abradable types with aluminum, bronze, or polymer-filled stationary elements
- Pump wear rings and throttle bushings with labyrinth profiles — for process pumps, boiler feed pumps, and cryogenic service
- Bearing isolator labyrinth seals — for electric motors, gearboxes, and rotating shaft protection in harsh environments
- Labyrinth seal strips and caulking pieces — individually machined or wire-cut segments for turbine and compressor retrofits
- Segmented labyrinth seal assemblies — with anti-rotation pins, garter springs, and split housings for easy installation
- Honeycomb and abradable-coated labyrinth stators — for enhanced leakage control in high-speed turbomachinery
Detection of Labyrinth Seals for Steam and Gas Turbines
- Tooth tip diameter, pitch, and radial clearance measurement per API 617 and customer drawings — precision micrometers, coordinate measuring machines, and laser scanners verify that the labyrinth tooth profile and the running clearance to the rotor conform to the design specification, ensuring optimal leakage control without risk of rubbing at operating speed and temperature.
- Seal housing bore alignment and concentricity check per ISO 1101 — the labyrinth seal housing is inspected for ovality and eccentricity using a CMM or dial indicator, confirming the seal ring will sit centrally around the shaft and provide uniform clearance around the full circumference.
- Runout and perpendicularity of seal mounting faces per ASME B46.1 — the sealing faces that contact the turbine casing or adjacent components are checked for axial runout to prevent assembly distortion that would misalign the labyrinth teeth relative to the rotor surface.
- Tooth edge sharpness and profile verification by optical comparator — the geometry of each labyrinth tooth, including the tip radius and included angle, is verified against the engineering drawing to ensure the designed flow resistance and wear life of the seal.
Detection of Labyrinth Seals for Centrifugal Compressors and High-Speed Machinery
- Abradable coating thickness and bond integrity per ASTM D4138 and ISO 14916 — for compressor labyrinth seals with abradable tips or stator coatings, the coating thickness is mapped and a pull-off test confirms the metallurgical or adhesive bond to the substrate, preventing coating liberation that would damage the impeller.
- Dynamic clearance simulation and rub-tolerance assessment per customer and OEM protocols — the labyrinth seal assembly is evaluated with the actual rotor profile under simulated thermal and centrifugal growth conditions to predict the minimum running clearance at full speed and temperature, ensuring the seal does not rub heavily during transient operations.
- Spring-back and segment mobility testing for split labyrinth seals — the floating or segmented seal elements are checked for free radial movement and spring tension to verify they can follow shaft displacement and vibration without binding or excessive leakage.
- Leakage flow and discharge coefficient determination per ISO 13349 and customer protocols — the labyrinth seal is tested on a calibrated air or steam flow rig under controlled pressure ratios, and the mass flow rate is measured to calculate the effective clearance and the discharge coefficient, providing the performance data required for aerodynamic design validation.
Detection of Labyrinth Seals for Pumps and Liquid Sealing Systems
- Diametrical clearance and groove geometry for pump wear ring labyrinths per ISO 5199 and API 610 — the internal diameter of the stationary wear ring and the outer diameter of the rotating labyrinth are precisely measured to calculate the running clearance, which governs the pump's volumetric efficiency and the onset of recirculation-induced vibration.
- Material verification of bronze, stainless steel, and polymer labyrinth components by optical emission spectrometry per ASTM E415 — the alloy grade of metallic seal rings and the composition of polymer or composite stationary elements are confirmed to be compatible with the pumped fluid and to prevent galling during potential rubs.
- Surface roughness and waviness of sealing faces per ISO 4287 — stylus profilometry measures the Ra and Rz values on the labyrinth bore and tooth flanks to ensure the surface finish promotes stable leakage flow and minimizes the risk of erosive wear from entrained particles.
- Hydrostatic pressure and leak-tightness test of the complete seal cartridge per API 682 — the assembled labyrinth seal is pressurized with water to verify the static sealing function at the casing joint and the gland, ensuring no external leakage under the maximum suction pressure of the pump.
Material and Hardness Verification for Labyrinth Seal Components
- Brinell, Rockwell, and Vickers hardness per ISO 6506-1, ISO 6508-1, and ISO 6507-1 — the hardness of each labyrinth seal part, including tooth tips, seal bodies, and springs, is measured to confirm conformity with the heat treatment specification and to predict wear resistance against the rotating counterface.
- Metallographic microstructure and grain size analysis per ASTM E112 and ASTM E3 — polished cross-sections of labyrinth seal strips are examined under an optical microscope to detect any carbide precipitation, decarburization, or grain boundary corrosion that would reduce the fatigue life and durability of the seal.
- Ferrite content measurement in austenitic and duplex stainless steel seals per ISO 8249 — the delta ferrite number is measured on the labyrinth seal material to verify the phase balance, ensuring adequate strength and corrosion resistance in sour gas and chloride-rich environments.
- Coating and plating thickness on labyrinth seal components per ISO 2178 and ASTM B487 — the thickness of silver, nickel, or phosphate coatings applied to labyrinth seals for anti-seizure protection is measured to ensure compliance with the engineering specification and to prevent galling during installation and rub events.
Non-Destructive Testing in Our Detection Service for Labyrinth Seals
- Liquid penetrant inspection of labyrinth tooth profiles and seal body surfaces per ISO 3452-1 and ASTM E165 — each labyrinth seal component is examined for surface-breaking cracks, grinding checks, and porosity that could initiate fatigue failure or allow process gas to bypass the seal.
- Ultrasonic testing of labyrinth seal rings and brazed joints per ASTM B594 and ISO 17640 — immersion or contact ultrasonic scanning detects subsurface laminations, inclusions, and lack of bond in brazed or welded labyrinth assemblies, ensuring the structural integrity of the seal ring under centrifugal and thermal loads.
- Eddy current surface inspection of abradable coatings and metallic labyrinth strips per ASTM E426 — high-frequency eddy current probes scan the labyrinth seal surface for fine cracks and coating disbonds that are not visible to the naked eye, particularly at the tooth root where stress concentration is highest.
- Magnetic particle inspection of ferromagnetic labyrinth seal housings per ISO 17638 — the seal housings, flanges, and attachment bolts are tested to reveal any forging or machining defects before assembly into the rotating machine.
Report Recognition and ISO/IEC 17025 Compliance
All inspection and test methods described in this detection service for labyrinth seals are covered by our ISO/IEC 17025 scope of accreditation. Our reports are accepted by European notified bodies for pressure equipment and rotating machinery, by North American turbine and compressor OEMs referencing API and ASME standards, and by regulatory and procurement authorities across the Middle East, Australia, and Asia. Whether you require a complete qualification dossier for a new labyrinth seal design, a batch release inspection for an export shipment, or a root cause failure analysis of a rub-related seal failure, our laboratory provides the measurement accuracy and rotating equipment expertise that the global turbomachinery industry demands.
