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in-service maintenance

the safety of in-service equipment throughout its entire lifecycle of use is directly related to people's lives, property, and public safety. instances such as mechanical wear during operation, improper usage, inadequate maintenance, and overloading can lead to safety incidents, such as elevator accidents in buildings or pressure vessel failures. consequently, the safety of the in-service use of public facilities is increasingly emphasized and has become an indispensable and crucial aspect that cannot be ignored.

in-service inspection services involve using various methods to systematically and methodically inspect certain in-service equipment. these inspections track existing defects, detect new ones, assess potential issues, and analyze and evaluate them to ensure that, until the next inspection, these defects won't compromise the functionality of the equipment or its components. this process guarantees the safe and efficient operation of the equipment.

through in-service inspections of equipment, it's possible to determine whether the facilities and equipment meet the latest regulatory requirements. these inspections also assess if the equipment has operated at its maximum efficiency throughout its lifecycle. this ensures the safety and integrity of the facilities, effectively prevents accidents, and significantly reduces long-term maintenance costs. in essence, these inspections play a crucial role in ensuring the optimal functioning of equipment.

based on its expertise in specialized service areas and experience in in-service inspections across various industries, noa provides systematic consultation solutions for facility and equipment in-service inspections. they tailor these solutions by considering the unique usage scenarios and management characteristics of different facilities and equipment users, planning and preparing differentiated strategies accordingly.

service scope

the services provided by noa include but are not limited to:

i. in-service inspection of pipelines, in-service pressure vessels, and in-service storage tanks involving the following examination
1.visual inspection
2.corrosion examination
3.non-destructive testing (ndt)
4.ultrasonic thickness measurement
5.vacuum box testing
6.verticality measurement
7.hydrostatic testing
8.failure analysis
9.in-service coating system analysis
10.phased array inspection

ⅱ.storage tank inspection
1.online inspection is conducted while the storage tank is in operation.
2.offline inspection is performed when the storage tank is opened.

ⅲ .electrical inspection for subways and high-speed railways

ⅳ .electrical safety inspection for in-service buildings

ⅴ .factory safety inspection
1.factory settlement observation
2.ground settlement detection

service process

1.customer submits specific requirements.
2.professionals engage with the client.
3.preparation of a professional inspection plan.
4.clarification or addressing of technical queries.
5.quotation provided.
6.signing of the technical service contract.
7.project execution.
8.conclusion and summary of the project upon completion

q&a

what is the process for inspecting in-service storage tanks?

(1) obtain raw data/information through visual inspection by inspection instruments or professional inspectors.
(2) analyze and process the raw data/information using methods required by standards and relevant software to generate visual or intuitive inspection results that are easily understandable for tank users, enabling a clear understanding of the tank's condition.
(3) based on the results of data analysis and processing, calculate the remaining service life of inspected parts/components or determine the next inspection time. for example, based on scan results indicating corrosion on the underside of the bottom plate, calculate the remaining service life of the bottom plate.
(4) provide repair recommendations for deteriorated inspection parts/components to ensure their continued use and to maintain the integrity of the tank after repairs are performed.

what are the items for external inspection of storage tanks?

(1) routine inspection—usually performed by the owner, with a frequency requirement of approximately once a month.
(2) visual inspection—conducted by professional inspectors to visually examine various components on the outside of the storage tank.
(3) acoustic emission—using an acoustic emission device to detect active defects inside and outside the tank bottom plate; it involves qualitative inspection.
(4) ultrasonic tank wall thickness measurement—using a crawler (equipped with ut thickness gauge) to climb from the tank bottom to the top, taking thickness measurements at regular intervals. the number of crawls per tank depends on the tank size or the owner's specifications. for stainless steel or insulated tanks, manual measurements are necessary.
(5) settlement monitoring—using a total station to observe monitoring points around the tank to obtain settlement data.

what are the items for internal inspection of storage tanks?

(1) visual inspection—professional inspectors examine various components inside and outside the tank according to an inspection checklist.
(2) underside corrosion detection of the bottom plate—magnetic flux leakage (mfl) scanning of the tank bottom, supplemented with conventional ultrasonic testing or phased array testing (for obstructed or problematic areas).
(3) non-destructive testing of welds—magnetic particle testing or dye penetrant testing of internal and external corner welds between tank wall plates and bottom plates, overlap/butt welds of tank bottom plates, repair welds, and connections where piping joins tank wall corner welds.
(4) ultrasonic thickness measurement of external edge plates.
(5) dimensional measurement—determining tank wall eccentricity and verticality.
(6) vacuum box testing—vacuum testing of bottom plate welds.
(7) settlement monitoring—observation using a total station of monitoring points around the tank and on the tank bottom to obtain settlement data.
(8) inspection of leak points (for tanks that have experienced leaks).

what are the commonly used standards for storage tank inspections?

(1) api 650 - welded steel tanks for oil storage.
(2) api 653 - tank inspection, repair, alteration, and reconstruction.
(3) api 575 - inspection of atmospheric and low-pressure storage tanks, guide for methods.
(4) api 577 - welding inspection and metallurgy.
(5) api 571 - damage mechanisms affecting fixed equipment in the refining industry.
(6) api 651 - cathodic protection of aboveground petroleum storage tanks.
(7) api 652 - lining of aboveground petroleum storage tank bottoms.
(8) asme v - nondestructive examination.
(9) asme ix - welding and brazing qualifications

our advantage

authoritative qualification

noa has been approved by certification and accreditation administration of the people’s republic of china（cnca）(cnca-r-2002-051), and has obtained qualification of china inspection body and laboratory mandatory approval (cma),and has passed the multiple approvals of china national accreditation service for conformity assessment (cnas), international accreditation service (ias), united kingdom accreditation service (ukas), joint accreditation system of australia and new zealand (jas-anz). noa has been approved by state administration for market regulation of china, and has been recognized as inspection and testing institution of china's special equipment, as well as the quality of china's national equipment supervision and engineering supervision. noa-dci is the notified body of the ce directive of the european commission. noa has been recognized by the international electrotechnical commission (iecq) by obtaining electronic component quality assessment system. it is also a national inspection and assessment notified body of import and export commodity in china.noa is a high-tech enterprise in shanghai.

improve performance, realize asset value appreciation, and service throughout the entire value chain

from pre-design to post-operation, noa has the ability to guarantee the whole life cycle of the business. noa, as an independent third-party inspection company, has a large number of domestic and international standards and specifications proficient in design, welding, non-destructive testing, painting, packaging and other fields the experienced team of professional engineers and inspection experts, with more than ten years of experience in the domestic market, is familiar with all aspects of the domestic industrial equipment supply chain, and can provide you with technical support services for the full life cycle of technical services in a timely manner, combining various products. inspection, certification, testing, consulting, and auditing services can provide you with one-stop all-round comprehensive services.

quality, efficiency and service

noa has formed a mature and solid operation system in the development of more than 20 years. we let technical experts who are familiar with market regulations and testing standards and have professional industry experience to carry out inspection, evaluation and design review work. while meeting the requirements of domestic and international standards, we ensure that customers can obtain satisfactory service results in the first time with accurate time-sensitive management methods, and ensure that customers can seize the opportunity in the market competition.

service area

noa inspection services currently cover europe, australia, russia, some middle east regions and most regions in china. noa can ensure the consistency and continuity of customer service in different regions, and eliminate the impact of unfamiliar environments on customer quality. the guarantees and the impact of project implementation enable customers to participate in different markets across the country or around the world with flawless quality.

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