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Stainless Steel Instrumentation
Fractional / Metric Tubing
TS-04-S
2011
5 of 6
www.dklok.comTable 6. Seamless Stainless Steel Metric Tubing
Recommended hardness: 80 HRB (180 HV) or less.
Tube
OD
Tube Wall Thickness
, mm
mm
0.8
1
1.2
1.5
1.8
2
2.2
2.5
2.8
3
3.5
4
4.5
3
710
6
330
420
520
670
8
310
380
490
Working Pressure in Bar
10
240
300
380
12
200
240
310
380
430
14
180
220
280
340
390
430
15
170
200
260
320
360
400
16
190
240
300
330
370
18
170
210
260
290
320
370
20
150
190
230
260
290
330
380
22
130
170
210
230
260
300
340
25
180
200
230
260
300
320
28
180
200
230
260
280
330
30
170
190
210
240
260
310
32
160
170
200
230
240
290
330
38
140
170
190
200
240
280
310
ASTM A269 tubing allowable working pressure is calculated at -20 to 100
℉
(-28 to 37
℃
) using allowable stress value
of 20,000 psi according to ASME B31.3 Code.
Pressure calculations are based on
maximum O.D. and minimum wall thickness
and no allowance is made for
corrosion and erosion. i.e., ASTM A269 1/2 in. OD x 0.035 in.: OD tolerance ± 0.005 in., WT tolerance ± 15%.
Calculations are based on 0.505
in.ODx 0.0298 in. WT.
Safety Factor is 3.75 to 1, considering ultimate tensile strength of 75,000 psi.
For working pressure according to ASME B31.1, multiply the ASME 31.3 rating by 0.94.