|Foot of| Foot |
| n t|G | n | n t | nal | nal | nal | nal |Surface| Exter | |
| a e|a | e | a e | | | | | per | -nal | |
| l r|u | s | l r | | | | |Foot of|Surface| |
| |g | s | | | | | |Length | | |
| |e | | | | | | | | | |
+-----+--+----+-----+------+------+------+------+-------+-------+-------+
|1-1/2|10|.134|1.232| 4.712| 3.870|1.7671|1.1921| .392 | 2.546 | 1.955 |
|1-1/2| 9|.148|1.204| 4.712| 3.782|1.7671|1.1385| .392 | 2.546 | 2.137 |
|1-1/2| 8|.165|1.170| 4.712| 3.676|1.7671|1.0751| .392 | 2.546 | 2.353 |
| 2 |10|.134|1.732| 6.283| 5.441|3.1416|2.3560| .523 | 1.909 | 2.670 |
| 2 | 9|.148|1.704| 6.283| 5.353|3.1416|2.2778| .523 | 1.909 | 2.927 |
| 2 | 8|.165|1.670| 6.283| 5.246|3.1416|2.1904| .523 | 1.909 | 3.234 |
|3-1/4|11|.120|3.010|10.210| 9.456|8.2958|7.1157| .850 | 1.175 | 4.011 |
|3-1/4|10|.134|2.982|10.210| 9.368|8.2958|6.9840| .850 | 1.175 | 4.459 |
|3-1/4| 9|.148|2.954|10.210| 9.280|8.2958|6.8535| .850 | 1.175 | 4.903 |
| 4 |10|.134|3.732|12.566|11.724|12.566|10.939| 1.047 | .954 | 5.532 |
| 4 | 9|.148|3.704|12.566|11.636|12.566|10.775| 1.047 | .954 | 6.000 |
| 4 | 8|.165|3.670|12.566|11.530|12.566|10.578| 1.047 | .954 | 6.758 |
+-----+--+----+-----+------+------+------+------+-------+-------+-------+

Dimensions are nominal and except where noted are in inches.

Pipe Material and Thickness--For saturated steam pressures not exceeding
160 pounds, all pipe over 14 inches should be 3/8 inch thick O. D. pipe.
All other pipe should be standard full weight, except high pressure
feed[77] and blow-off lines, which should be extra strong.

For pressures above 150 pounds up to 200 pounds with superheated steam,
all high pressure feed and blow-off lines, high pressure steam lines
having threaded flanges, and straight runs and bends of high pressure
steam lines 6 inches and under having Van Stone joints should be extra
strong. All piping 7 inches and over having Van Stone joints should be
full weight soft flanging pipe of special quality. Pipe 14 inches and
over should be 3/8 inch thick O. D. pipe. All pipes for these pressures
not specified above should be full weight pipe.

Flanges--For saturated steam, 160 pounds working pressure, all flanges
for wrought-iron pipe should be cast-iron threaded. All high pressure
threaded flan