Strictly control the purchase of raw materials, 100% inspection of
the chemical composition and mechanical properties of the
materials;
Blanking material in strict accordance with the standard or drawing
check, check mark is complete right. No marking materials shall not
be used;
After first Pipe Nipple processing thread, using qualified
measuring tool measuring the size of the thread, to ensure that
conform to the requirements of the standard or drawing for mass
production;
Can NPT, BSPT thread machining, the surface can be pickling or
blasting;
Pipe Nipple surface is smooth, without scale. Scratches depth <
5% wall thick, must not have more than 0.5 mm scar, fold, cut,
dissection defect. Depth of more than 10% of nominal wall thickness
1.5 mm or greater than mechanical scratches and pits shall be
removed.