Quality System

NPA quality control system is strictly in accordance with ISO9001. All production and process inspection can be traced to ensure the effective quality production process and provide reliable quality assurance.

NPA prepares quality manual and procedure documents according to GB/T 19001 (ISO9001) standard file requirements and product structure. The contents of the documents contain all the quality control regulations of the products, and the quality management is strictly in accordance with related terms of GB/T 19001 (ISO9001) .


Design documentation: design documentation requirements by engineering company .

World related manufacturing standards:

Centrifugal casting: HG/T 2601-2011、ASTM A608、DIN 10295、JIS G5122...

Static casting: HG/T 3673-2011、ASTM A351...

Inspection content:

Prepare production drawings, technical documents and quality inspection plan for each contract. Provide raw material inspection, production process inspection, finished product inspection, outsourcing parts inspection.


Production, inspection and testing of equipment, facilities meet the requirements of all inspections and tests.

Quality control points

Each production procedure shall set up stop point at corresponding quality inspection position. And check relevant process product quality; record and identify at each stop point.

On Site Inspection

Eddy current flaw detector

ET-551H computer digital multifunctional eddy current instrument adopts the most advanced eddy current technology, digital electronic technology, computer technology design, it is newly upgraded type of eddy current testing equipment. The multi sector and arbitrary polygon alarm region are adopted to meet the requirements of the skin effect of the eddy current field and the alarm region of the different depth defects. It is applicable to flaw detection, thickness measurement and separation for all kinds of metal pipes, rods, wires and other mechanical parts, and other eddy current detection occasions.

See snake LT1000 type cable wheel controller

Realizes the combined function of laptop and industrial endoscope, the laptop is set to be see snake displayer, make it as powerful as a computer in the display and recording function, digital storage, DVD burner, wireless transmission and online host can be easily achieved via a laptop and LT1000. It is very flexible, easy to review, burn and edit the reports. With full use of the powerful function of laptop, we use HQ See Snake software for review, storage and information exchange.

X ray/radiographic test

The X-ray machine is based on the fully studying of home and abroad relevant technical performance index, combined with the current trend of modern development of IP technology; it is well developed and important equipment for nondestructive testing. This type X ray machine is widely used in machinery, chemical, petroleum, electric power, aviation, boiler, national defense and other industrial sectors, providing with reliable detection methods.