Ningbo LD has its own lab , we do Chemical and Mechanical analysis on Tube, Rod, Casting, Forging Parts, etc.

Ningbo LD is qualified to ISO9001, 16,000 Square foot workshp with complete advanced machines with over 100 operators in total.

Ningbo LD is qualified to AWS D1.1 certification.We use Japan Panasonic controllers to assures our superior stable welding quality.

Ningbo LD assemble cylinders in a dust-free Clean room environment. We do 100% pressure Testing for every finished cylinders.

Ningbo LD auto-painting line is qualified to EIS standard. One painting line's capacity is 1400pcs cylinder in total.

Ningbo LD standard cylinders are all approved By quality testing, which can make sure 2 Years Limited Warranty