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Nexology Services - Professional industrial inspection and certification

Discover Our Comprehensive Services

Explore our comprehensive inspection, testing, and certification services designed to support safety, compliance, and operational reliability across critical industrial systems and infrastructure.

Core Systems Inspection

Our core inspection services focus on critical pressure and mechanical systems essential to safe and reliable operations. We provide inspection, testing, and certification across the full asset lifecycle, ensuring structural integrity, compliance, and operational performance.

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Pressure Retaining Items & Piping Inspection

Inspection, engineering testing, condition evaluation, and certification of pressure retaining items (PRI), including pressure vessels, piping systems, and air receivers, with on-site evaluation where required.

Executed in accordance with DIW, DLPW and DOEB regulatory requirements, aligned with ASME B31 and API 510 and 570 to ensure compliance, asset integrity, and safe operation.

Storage Tank & Fuel Systems Assessment

Inspection and integrity assessment of aboveground and underground storage tanks (AST & UST), including vertical, horizontal, and bullet-type tanks, and associated fuel systems.

Applied across refineries, tank farms, fuel depots, and storage terminals. Based on DOEB requirements and aligned with API 650 and API 653, and applicable API standards, ensuring safe and reliable operation.

Thermal Systems Inspection & Certification

Inspection, engineering testing, evaluation, and certification of thermal systems, covering power and heating boilers, thermal fluid heaters, furnaces, HRSG units, heat exchangers, and power piping systems.

Performed in line with DIW regulatory requirements, consistent with ASME Section I, IV, VI, VII, ASME B31, NBIC NB-23, and applicable API standards, ensuring safe and reliable operation.

Pipeline Integrity & Inspection

Inspection, testing, evaluation, and integrity assessment of pipelines and fuel and gas distribution systems, comprising transmission lines, piping networks, and associated facilities such as pumping and metering stations.

Covers in-service inspection, periodic assessment, and pressure testing. Following regulations and ASME B31.4, B31.8, and API 570, ensuring integrity and compliance.

Lifting Equipment Inspection & Certification

Inspection, testing, evaluation, and certification of lifting equipment, comprising overhead, gantry, and tower cranes, mobile cranes, hoists, and lifting accessories.

Includes initial and periodic inspection, load testing, and re-certification. Conducted in accordance with DLPW regulatory requirements, aligned with ASME B30 series and applicable safety standards, ensuring compliance across industries.

Safety Relief Devices & Valve Inspection

Inspection, testing, and certification of safety relief valves (SRVs) and pressure relief devices to verify functionality, set pressure, discharge performance, and operational reliability.

Comprises bench testing and in-situ verification for pressure systems across industrial facilities. Aligned with ASME Section I and VIII and API 520, 526, 527, and 576, ensuring compliance and safe operation.

Fuel, Gas & Energy Systems

We provide specialized inspection and certification solutions for fuel, gas, and energy infrastructure, covering storage, transport, and distribution systems. Our services support regulatory compliance, operational safety, and system integrity in accordance with DOEB requirements and applicable industry standards.

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Fuel Stations & Distribution Systems

Inspection, verification, and condition assessment of fuel and gas systems at fueling stations, LPG and NGV stations, and distribution facilities, including piping, dispensing systems, and storage components.

Provides commissioning verification and periodic inspection of transfer and storage operations. Meeting the requirements of DOEB regulations and aligned with ASME and API codes and standards, ensuring safe handling and operational reliability.

Fuel Transport Vehicle & Mobile Systems

Inspection, testing, and certification of fuel transport vehicles, including LPG tank trucks, fuel rail tank cars, and mobile units.

Undertakes periodic inspection and re-certification, covering functional safety systems such as emergency shut-off, leak testing, and safety relief devices. Governed by DOEB requirements and transport safety standards, ensuring safe operation and compliance.

Fuel Terminals, Depots & Tank Farms

Inspection, evaluation, and certification of storage and transfer systems across oil depots, fuel terminals, LPG and LNG terminals, and tank farms.

Incorporates commissioning verification and periodic inspection of transfer and storage operations. Consistent with DOEB regulations and ASME and API codes and standards, ensuring safe handling and operational reliability.

LPG & Gas Distribution Systems Inspection

Inspection, evaluation, and verification of LPG manifold systems, gas distribution networks, and associated infrastructure.

Comprises periodic inspection across industrial, commercial, and public facilities such as hotels, shopping malls, hospitals, filling plants, and distribution centers. In line with DOEB requirements and ASME and API standards, ensuring safe operation and compliance.

Chemical Storage & Handling Assessment

Assessment of chemical storage tanks, transport vehicles, and handling systems to evaluate containment integrity, process control, and operational safety.

Covers flammable, corrosive, industrial gases, and cryogenic liquids. Includes inspection against DIW and DLT regulations, relevant international standards, and industry safety codes for petrochemical, manufacturing, and logistics operations.

Vapor Recovery & Emissions Systems

Inspection, testing, and verification of vapor recovery units (VRU) and emissions control systems, supporting fuel storage and transfer operations across terminals, depots, and fueling facilities.

Includes system performance checks for vapor capture and control. Conducted in accordance with DOEB environmental requirements, aligned with API and relevant industry standards, ensuring regulatory compliance and safe operation.

Inspection Lifecycle & Certification

Our services support the full inspection and certification lifecycle of industrial systems and equipment, from initial installation and commissioning to in-service inspection, regulatory renewal, and periodic re-certification. This lifecycle approach ensures continued integrity, compliance, and safe operation throughout the asset’s service life.

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Post-Construction & Commissioning Inspection

Inspection and verification of newly installed systems and equipment prior to operation, including pressure systems, storage tanks, and fuel and gas installations.

Covers installation quality, system readiness, and pre-commissioning checks. In compliance with DOEB and DIW requirements, aligned with applicable engineering standards, ensuring safe startup and operational readiness.

In-Service & Annual Inspection

Periodic in-service inspection of operating equipment and systems, including pressure vessels, pipelines, storage tanks, and fuel systems, to evaluate condition and performance.

Supports annual inspection requirements for license renewal and continued operation. In accordance with DOEB, DIW, and DLPW frameworks, ensuring compliance and safe, reliable operation.

Periodic Re-Certification & Major Inspection

Comprehensive inspection and re-certification of equipment through scheduled major inspections to assess structural integrity and long-term performance.

Applied to pressure equipment, storage systems, and critical infrastructure. Following applicable regulatory requirements, aligned with API and ASME standards, ensuring continued serviceability and compliance.

Condition Monitoring & Risk-Based Inspection

Condition monitoring, risk-based inspection, and fitness-for-service evaluation of equipment and systems, supporting remaining life assessment and integrity management.

Addresses degradation tracking such as corrosion and cracking, and application across pressure equipment, tanks, and energy systems. Aligned with API 580/581 and API 579-1, ensuring reliable operation and risk-informed maintenance planning.

Modification & Alteration Verification

Inspection and verification of system modifications and alterations to confirm compliance with design codes and regulatory requirements.

Relates to changes to pressure systems, piping, and associated equipment, ensuring integrity, safety, and operational performance are maintained. In line with applicable codes and standards, supporting compliant and reliable system operation.

Shutdown, Turnaround & Outage (STO) Inspection

Inspection, testing, and condition evaluation during planned shutdowns, turnarounds, and maintenance outages across power generation, refinery, petrochemical, and oil and gas facilities.

Involves defect identification, system checks, and readiness verification prior to restart. Conducted in accordance with requirements, aligned with ASME and API standards, ensuring safe restart and compliance.

Specialized Engineering Services

We provide specialized engineering services to support complex inspection, testing, and certification requirements, including material evaluation, welding engineering, fire protection systems, and technical consultancy. These services enhance system integrity, regulatory compliance, and operational reliability across industrial and energy infrastructure.

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Engineering Testing & Material Evaluation

Engineering testing and material evaluation of industrial equipment and components to determine material properties, performance, and service condition.

Includes mechanical testing, field verification, and analytical assessment supporting integrity evaluation, failure analysis, and quality assurance. In accordance with applicable testing standards and recognized engineering practices, ensuring reliable performance and material suitability.

Corrosion & Damage Mechanism Management (CUI & DMR)

Evaluation of corrosion conditions, damage mechanisms, and material degradation across industrial equipment and systems, focusing on corrosion under insulation (CUI) and damage mechanism review (DMR).

Addresses condition monitoring at CMLs, targeted testing, and assessment of cracking such as SCC and HIC. Aligned with API 571 and API RP 583, ensuring asset integrity and reliability.

Engineering Design Verification & Technical Consultancy

Verification of engineering designs and technical consultancy for industrial systems, including design calculations review and system evaluation.

Covers applications such as fire protection systems for fuel and gas facilities and critical process systems. Performed in accordance with applicable codes and regulatory requirements, ensuring safe, compliant, and effective implementation.

Fire Sprinkler Systems Inspection & Compliance

Inspection, testing, and evaluation of fire sprinkler and deluge systems for LPG storage, tank farms, and gas cylinder storage areas.

Undertakes performance checks of pumps, control valves, and spray coverage for effective cooling and fire control. Based on DOEB requirements and NFPA 13 and 15, ensuring system readiness and compliance.

Welding Engineering & Quality Assurance

Welding engineering support and quality assurance services for fabrication, repair, and modification of industrial equipment and systems.

Provides welder and welding qualification tests (WQT), procedure qualification, and inspection oversight. In compliance with AWS D1.1 and welding codes, ensuring weld integrity and service performance.

Training & Competency Development

Technical training and competency development programs in inspection, engineering testing, and welding practices.

Delivers personnel qualification, certification readiness, and practical skill development, bringing together API Inspector courses aligned with API BOK and ICP, and engineering testing courses in compliance with SNT-TC-1A, supporting competency and performance.

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Testing and Inspection Services for Air Receiver Tanks

Full Compliance with Ministerial Regulation B.E. 2564 (2021)

Ensuring safety and full regulatory compliance by utilizing our certified inspectors and licensed professional engineers.

Definition of a Pressure Vessel

A pressure vessel is a closed container in which the internal and external pressures differ by more than 0.5 bar. This definition includes reaction vessels but excludes gas storage containers, such as air receiver tanks.

Applicable Standards

All equipment shall comply with relevant industrial product standards or internationally recognized standards, including ISO, ASME, JIS, DIN, TRD, BS, EN, and DOT, or other equivalent standards as specified by the Director-General.

Certification Services You Can Trust

Delivering full legal compliance for your equipment and systems through our licensed professional engineers.

Benefits

Time Efficiency

Accelerate your operations with fast, reliable inspection services that reduce delays and keep your projects on track.

Professional Excellence

Elevate your operations with precise, professional inspection and certification services that reflect the highest standards of safety and compliance.

Cost-Efficiency

Reduce operational costs by ensuring compliance from the start, minimizing rework, regulatory penalties, and unexpected downtime.

Operational Confidence

Present your operations with confidence through professional inspection and certification services that reinforce safety, compliance, and reliability.

What our clients say

From inspection to certification, our work is measured by results. See how our services have supported clients in achieving compliance and operational confidence.

"Highly reliable and professional service. Their inspection and certification process saved us time and ensured we met all necessary standards seamlessly."


Kanchana

Managing Director

"Their expertise in regulatory certification gave us complete confidence. The entire process was smooth, well-structured, and delivered on time"


Prani

Factory Manager

"The inspection process was handled with professionalism and precision. Their team ensured full compliance while keeping everything efficient and clearly communicated."


Somchai

QA/QC Manager

Find the Right Inspection Solution for Your Assets

From Engineering Testing and Inspection to regulatory certification, we offer comprehensive services tailored to your industry needs.