thread specifications0 pages

Tubing–Working Pressure Tables...Continued
t
Table #3: Carbon Steel Tubing
TUBEt
Wall Thickness of Tube (inches)
O
t D (In)t0.028t
0.035t
0.049t
0.065t
0.083t
0.095t
0.109t
0.120t
1/8t
6,782 t
8,865 tttttt
3/16t
4,319 t
5,556 t
8,253 ttttt
1/4t
3,166 t
4,043 t
5,912 t
8,254 tt Working Pressure (psig) tt
5/16tt
3,177 t
4,604 t
6,356 tttt
3/8tt
2,615 t
3,769 t
5,167 tttt
1/2tt
2,051 t
2,940 t
4,003 t
5,265 ttt
5/8tt
1,623 t
2,318 t
3,140 t
4,106 t
4,774 tt
3/4ttt
1,912 t
2,583 t
3,364 t
3,901 t
4,545 t
7/8ttt
1,627 t
2,193 t
2,848 t
3,297 t
3,833 t
1ttt
t
1,415 t
1,904 t
2,469 t
2,855 t
3,314 t
3,681
1 1/4tttt
1,504t
1,946t
2,246t
2,601t
2,885t
1 1/2ttttt
1,607t
1,853t
2,143t
2,374t

0.134t

0.148t

0.165t

0.180t

0.22

3,251t
2,672t

3,624t
2,974t

4,086t
3,347t

4,501t
3,681t

5,650
4,599

The Allowable working pressures for carbon steel seamless tubing to ASTM A 822-90 or equivalent based on the following data: Temperature: –20°F to 100°F; Ultimate Tensile Strength: 47,000 psi;
Allowable stress: 15,700 psi as specified by ASME B31.3-2002.
Table #5: Stress Factor for Elevated Temperatures
t t
t
t
Carbon
t t
Stainless Steelt
Coppert
Steelt
Monel
TEMPt
ASTM A-269t
ASTMt
ASTMt
ASTM
t(°F)t
304t
316t
B-75t
A-179t
B-165
100t
1.00 t
1.00 t
1.00 t
1.00 t
1.00
t
Table #4: Monel Tubing
200t
1.00 t
1.00 t
0.80 t
0.96 t
0.88
TUBEt
Wall Thickness of Tube (inches)
300t
1.00 t
1.00 t
0.78 t
0.90 t
0.82
O
t D (In)t0.028t
0.035t
0.049t
0.065t
0.083t
0.095t
0.109t
0.120
400t
0.94 t
0.97 t
0.50 t
0.86 t
0.79
1/8t
8,007 t
10,462 tttttt
500t
0.88 t
0.85 tt
0.82 t
0.79
1/4t
3,758 t
4,798 t
7,012 t
9,788 tt Working Pressure (psig) tt
600t
0.82 t
0.85 tt
0.77 t
0.79
3/8tt
3,109 t
4,479 t
6,139 tttt
700t
0.80 t
0.82 tt
0.73 t
0.79
1/2tt
2,298 t
3,288 t
4,470 t
5,867 ttt
800t
0.76 t
0.80 tt
0.59 t
0.68
3/4ttt
2,269 t
3,064 t
3,989 t
4,625 t
5,389 t
900t
0.73 t
0.78 tt
0.41 t
0.43
1tttt
1,682 t
2,263 t
2,933 t
3,390 t
3,934 t
4,370
1000t
0.69 t
0.77 tt
0.16 t
The Allowable working pressures for Monel Alloy 400 seamless tubing for ASTM B165-05 or equivalent
based on the following data: Temperature: –20°F to 100°F; Ultimate Tensile Strength: 70,000 psi; Allowable
stress: 18,700 psi as specified by ASME B31.3-2002.

To find the maximum allowable working pressure for various tubing
materials at elevated temperatures, multiply the maximum allowable
working pressure for the tube size and wall thickness found in Tables 1,
2 and 3 by the correct stress factor found in this Table.

Thread Specifications
Brennan’s connectors have one or more tubing end connections and there are a variety of pipe threads for which Brennan’s Double-Ferrule Tube
Fittings are available. Two of the most popular thread connections are the American National Pipe Thread (NPT) and the British Standard Pipe
Threads (BSP). These threads meet the standards of individual countries as well as the codified ISO standards. All Brennan fittings with pipe threads
or stud end threads conform to the specifications below:
• American National Pipe Thread (NPT): Reference specification ASA B2.1; 1960
• ISO Parallel Pipe Thread (British Standard Pipe Thread): Reference specifications BS 2779, ISO 228/1, DIN 259, JISB 0202, IS 2643
• ISO Taper Pipe Thread (British Standard Pipe Taper Thread): Reference specifications BS 21, ISO 7/1, DIN 2999, JIS B0203, IS 554
• Unified National Pipe Threads: Reference specifications ASA B1.1; 1964

B r e n n a n
I n d u s t r i e s
Atlanta • Cleveland • Dallas • Los Angeles • Seattle