Drier inspection service

Drier Inspection Service for Global Compressed Air and Process Drying Compliance

As an ISO/IEC 17025 accredited laboratory, we deliver a comprehensive drier inspection service that verifies drying performance, pressure integrity, electrical safety, mechanical durability, and long-term reliability of industrial drying equipment. Our drier inspection service supports manufacturers and exporters of refrigerated air dryers, desiccant dryers, membrane dryers, and process gas dryers who must demonstrate conformity to ISO 7183, ISO 8573-1, ASME, PED, and regional compressed air quality standards across the European Union, North America, the Middle East, and Asia. Every test is performed under our CNAS-accredited quality system, producing reports accepted by notified bodies, plant engineers, and procurement teams worldwide.

Product Samples We Regularly Test in Our Drier Inspection Service

Refrigerated compressed air dryers — cycling and non-cycling types for general industrial compressed air systems
Desiccant air dryers — heatless, heated, and blower-purge regenerative dryers for low dew point applications
Membrane air dryers — for point-of-use drying, instrument air, and hazardous area installations
Deliquescent and chemical dryers — for natural gas dehydration and process gas drying
High-pressure breathing air dryers — for diving, firefighting, and medical gas systems
Refrigerant and desiccant dryer combinations — for critical low-humidity industrial processes
Dryer components and replacement cartridges — desiccant beds, membrane modules, heat exchangers, and control valves

Drying Performance and Air Quality Testing in Our Drier Inspection Service

Pressure dew point measurement and verification per ISO 7183 and ISO 8573-3 — the outlet air dew point of the dryer is measured using a calibrated chilled-mirror hygrometer or capacitive sensor under controlled inlet conditions, verifying the dryer achieves the specified pressure dew point class for the compressed air system.
Water vapor removal capacity and moisture reduction rate per ISO 7183 — the mass of water removed per unit time is calculated from the inlet and outlet humidity measurements, confirming the dryer meets the declared moisture removal capacity for the rated airflow.
Regeneration cycle performance and purge air consumption per ISO 7183 and customer protocols — for desiccant dryers, the purge air flow rate and the regeneration cycle duration are measured to verify the dryer achieves the specified dew point while minimizing energy consumption and purge loss.
Dew point stability under varying inlet conditions — the dryer is tested under fluctuating inlet temperature, pressure, and humidity to verify the outlet dew point remains stable and within specification across the full operating envelope.
Oil carryover and particle contamination downstream of the dryer per ISO 8573-2 and ISO 8573-4 — the outlet air is sampled for oil aerosol, oil vapor, and solid particles to confirm the complete drying system meets the air purity class specified for the application.
Long-term dew point stability and desiccant life evaluation — the dryer is operated continuously for an extended period and the dew point is monitored to predict desiccant replacement intervals and to verify the long-term drying performance of the equipment.

Pressure Integrity and Leak Tightness Testing for Driers

Hydrostatic pressure test per ASME VIII and PED 2014/68/EU — the pressure-retaining envelope of the dryer is pressurized with water to a minimum of 1.5 times the maximum allowable working pressure and held for a code-specified duration, with zero visible leakage or permanent deformation permitted to verify structural integrity.
Pneumatic pressure decay and leak tightness test per ASTM E2930 — the dryer system is pressurized with dry air or nitrogen and the pressure decay rate is recorded to detect any leaks in the heat exchanger, piping, valves, or desiccant vessels.
Helium mass spectrometer leak detection per ISO 20485 — for high-integrity dryers used in semiconductor, pharmaceutical, and food-grade applications, the complete system is tested with helium tracer gas to detect leak rates down to 10⁻⁹ Pa·m³/s.
Burst pressure and ultimate strength verification per ISO 1402 — the dryer pressure vessel is pressurized hydraulically until rupture to determine the ultimate safety margin, which must exceed a specified factor above the maximum rated working pressure.
Pressure cycling and fatigue testing per ISO 19859 — the dryer is subjected to repeated pressure cycles from zero to rated pressure to simulate start-stop operation, with post-test leak and performance verification to confirm no fatigue damage.

Electrical Safety and Control System Testing for Driers

Dielectric strength and insulation resistance per IEC 60204-1 and IEC 60335-2-40 — the dryer's electrical system is tested with a high-voltage withstand test and a megohmmeter measurement to verify the insulation protects operators from electric shock and the equipment from insulation failure.
Protective earthing continuity and ground bond test per IEC 60204-1 — a high current is passed through the earth terminal and accessible metal parts to confirm the resistance remains below 0.1 ohm, ensuring a reliable fault current path.
Control system function and dew point controller calibration — the dryer's electronic controller is tested across its full operating range to verify accurate temperature, pressure, and dew point sensing, and the alarm and shutdown functions are activated to confirm safe operation under fault conditions.
Refrigerant circuit leak detection for refrigerated dryers per EN 378-2 — the refrigerant system is pressurized with a tracer gas and scanned with a mass spectrometer or electronic leak detector to verify the hermetically sealed circuit meets the maximum permissible leak rate.
Standby power consumption and energy efficiency per EU 2019/1781 — the dryer's power draw during standby and under full load is measured to verify compliance with ecodesign requirements for energy-related products.

Mechanical and Environmental Durability Testing for Driers

Vibration and mechanical shock resistance per IEC 60068-2-6 and IEC 60068-2-27 — the dryer is vibrated under sinusoidal and random profiles representative of industrial plant environments, followed by mechanical shock pulses to simulate transport and installation impacts.
Damp heat and humidity exposure per IEC 60068-2-78 — the dryer is operated in a 40 °C and 93% relative humidity environment, followed by insulation resistance and functional retests to ensure no moisture ingress degrades the electrical or drying performance.
Thermal cycling and thermal shock per IEC 60068-2-14 — the dryer is cycled between the minimum and maximum rated ambient temperatures to verify the heat exchangers, desiccant beds, and control systems withstand thermal expansion stresses without cracking or performance loss.
Neutral salt spray and cyclic corrosion resistance per ISO 9227 and ASTM B117 — the dryer housing, fasteners, and exposed metallic components are exposed to salt fog for defined durations to evaluate pitting and coating degradation in coastal and marine installations.
Ingress protection rating verification per IEC 60529 — the dryer electrical enclosure and controls are subjected to dust and water spray tests to confirm the declared IP code, ensuring reliable operation in dusty, washdown, and outdoor environments.

Material Verification and Chemical Safety Compliance for Driers

Optical emission spectrometry for alloy verification of pressure vessels and piping per ASTM E415 — the chemical composition of the dryer's pressure-retaining components is confirmed to meet the specified material grade for the design pressure and temperature.
RoHS compliance per IEC 62321 and EU Directive 2011/65/EU — quantitative screening for lead, mercury, cadmium, hexavalent chromium, PBBs, and PBDEs in the electronic controls, wiring, plastic components, and any printed labels.
REACH Annex XVII and SVHC screening — targeted analysis of Substances of Very High Concern including specific phthalate plasticizers and brominated flame retardants in polymer seals and electrical insulation.
Desiccant material purity and regeneration efficiency testing — the desiccant bed material is analyzed for moisture capacity, crush strength, and regeneration temperature range to verify it meets the performance specification for the dryer.
Heavy metals in packaging per EU Directive 94/62/EC — verification that the sum concentration of lead, cadmium, mercury, and hexavalent chromium in the packaging materials is below the 100 ppm regulatory limit.

Report Recognition and ISO/IEC 17025 Compliance

All test methods described in this drier inspection service are included within our ISO/IEC 17025 scope of accreditation. Our technical reports are accepted by European notified bodies under the Pressure Equipment Directive and the Machinery Directive, by North American plant engineers and compressed air system specifiers, and by customs and procurement agencies across the Middle East, Australia, and Asia Pacific. Whether you require a complete qualification dossier for a new industrial dryer design, a batch release inspection for an export shipment, or a root cause failure analysis of a dew point performance issue, our laboratory provides the measurement accuracy and process engineering expertise that the global compressed air and drying industry demands.