Quality Control: 1)Production Standard ;ASTM A**9;ASTM A**9 ,ASTM **4,APIRP5 C7.
GRADE;SS**4, SS**6L; SS**4L,SS**6 ect.
3) Hydraulic test for each coil and consistent with ASTM standards and requested specifications. 4) The specification per coil can be customized at customers requirements.