ASME SA335 P12 VS ASME SA213 T12
T-Finger Tube: ASME SA-213 T12, P-Finger Pipe:ASME SA-335 P12.
ASME has developed two sets of standards for the pipe, respectively, for boiler heating pipe and pipe with the pipe, the two main differences between the standard pipe are as follows:
a. Diameter and thickness of the different ways
Pipe diameter and thickness of the method of expression, the heating surface pipe nominal diameter and minimum thickness, pipe with NPS and pipe wall thickness of the serial number (schedule number).
The wall thickness of the serial number from thin to thick 10,20,30,40,80,120,140,160 a total of 8 series, of which 40 for the standard series, 80 thickening series, 120 thick series.
The wall thickness of the serial number from thin to thick 10,20,30,40,80,120,140,160 a total of 8 series, of which 40 for the standard series, 80 thickening series, 120 thick series.
It should be noted that the NPS of the United States is the same as that of GB / T 1047 "nominal diameter of pipeline components", and it is not only the outer diameter but not the inner diameter, For example, the outer diameter of 2.375in (60.3mm), the inner diameter and the wall thickness of the serial number on the 40th, the inner diameter of 2.375-2 × 0.154 = 2.067in (52.5mm), No. 80 is 2.375- 2 × 0.218 = 1.939 in (49.3 mm).
b. The range of tube diameter and thickness is different
Tubing for heating surfaces has a smaller diameter and thickness. For example, pipes supplied to SA-213 have a maximum outer diameter of 5 in. (127 mm) and a minimum thickness of 0.5 in. (13 mm). Pipe diameters and thicknesses unlimited.
Because of the two sets of standards for the pipe, so the same chemical composition of the heating surface and the pipe with a pipe, grades represent different methods, such as the nominal composition of 1Cr-0.5Mo ferritic steel pipe, heating surface pipe grades For the SA-213, T12, pipe pipe for the SA-335, P12, two kinds of pipe brand difference, one standard number are SA-213 and SA-335, respectively, And P, but for austenitic steel pipe, the heating surface and the pipe with the pipe no more grades were added T or P, but a unified filling TP, for example, the nominal composition of 18Cr-8Ni austenitic steel pipe, The heating surface pipe is SA-213, TP304H, pipe pipe for the SA-376, TP304H.
