1. BS13897-85: Black pipes ,galvanised steel pipe, both end screwed & socket for water service;

2. DIN2440:: Black pipes,galvanised steel pipe, both end screwed & socket for water service;

3. ISO65 : Black pipes , galvanised  steel pipe, options: both end screwed & socket for water service;

4.BSEN10255: black pipes, galvanized steel pipe ,100% nondestructive inspection test online( options);

5.GB/T3091-2008: black pipes, galvanised seel pipe, plain ends;

6.ASTM A53, SCH40 ,black pipes, galvanised steel pipe,  Type E or Type S , for liquid pressure service;