First, factory self-check by professinal staff in inspection room.

Items:

Visual Inspections

a. Inspect and take measurements of the thickness of the pipes and ensure the numbers conforms to design specifications.

b. Inspect for indentations, pitting, cracks, uneven surfaces

Mechanical Inspection

a. Perform the impact resistance test to determine the impact strength

b. Test the tensile strength of the pipes to determine how the material will react to forces being applied in tension.

c. Perform the deflection temperature test to ensure the pipe sample deforms under a specified temperature and conforms to international standards

Packaging Inspections

a. Check packaging materials by comparing against approved samples and specifications.

b. Inspect necessary packaging marks including model number, quantity per packaging, name and place of business of distributor, country of origin, logos and marks from standards organizations, and stacking and handling marks.

c. Check the safety markings for clarity, size, color, conspicuousness, etc.

Second, the third-party from the SGS, Bv, DNV, LR,etc.

Required Documents for Third Party Inspector Review;

Third Party Inspection for Line Pipe - Material Inspection;

Third Party Inspection for Line Pipe - Manufacture;

Third Party Inspection for Line Pipe Inspection during Manufacturing;

Third Party Inspection for Line Pipe Hydrostatic Testing;

Third Party Inspection for Line Pipe Visual and Dimensional Examination;

Third Party Inspection for Line Pipe Marking;

Third Party Inspection for Line Pipe - Reporting;

Third Party Inspection for Line Pipe - Release Note;

Third Party Inspection for Line Pipe Packing, Marking and Shipping;

Third Party Inspection for Line Pipe Documentation.

Third, End usder(Clients) confirm the final quality in person

1. Related report check and review, such as, mill test certificate, 3rd party report;

2. Visual review: welding, surface, straightness, package, marking;

3. Tool test: sizes(out diameter, wall thickness, length), hardness;

4. Machine retest: hydrostatic, pressure;

5. Usage experience in project.