1. Chinese standard: GB/T3091-2001, GB/T13793-1992
2. American standard: ASTM A53
3. Britain standard: BS1387
4. German standard: DIN 2440/2441/2444
5. Japanese standard: JIS G3441/G3442/G3444/G3445/G3452/G3454/ G3456 G3460/G3461/ G3462/G3464
The pipe uses hot dip galvanized technics. Each piece has passed the hydrostatical press test. It has a strong anti-corrosive capability. It is mainly used for supply water, hot, gas and oil conduit.