PVF SUPPLY COMPANY, INC.

1611 West 7th Street, P.O Box 1796
Owensboro, KY 42302
270.685.4919
www.pvfsupplyco.com

 

TUBING WORKING PRESSURES
 

STAINLESS STEEL TUBING

Chart #1

 

304 and 316 ANNEALED SEAMLESS TUBING (ASTM A-269, 213 or Equivalent) Basis: ALLOWABLE STRESS = 20,000 PSI between -20F and 100F.
Factor of Safety = 4, considering
tensile strength to be 75,00 psi at room temperature. Tubing hardness should
not exceed RB 90.

REFERENCE: ANSI B 31.3.

 O.D TUBE (IN.)

WALL THICKNESS OF TUBE (INCHES)
0.01
0.012
0.016
0.02
0.028
0.035
0.049
0.065
0.083
0.095
0.109
0.12
1/16"
5,600
6,860
9,480
12,100
1/8"
8,520
10,900
3/16"
5,480
7,040
10,260
1/4"
4,020
5,140
7,500
10,266
5/16"
4,040
5,860
8,060
3/8"
3,340
4,800
6,580
1/2"
2,460
3,520
4,780
6,280
5/8"
2,080
2,960
4,000
5,220
6,080
3/4"
2,440
3,300
4,280
4,980
5,800
7/8"
2,080
2,800
3,640
4,200
4,880
1"
1,818
2,400
3,160
3,640
4,220
4,700
WELDED TUBING * For calculating the maximum allowable working pressure for welded and drawn tubing, derating factor must be used. For double welded tube, multiply the above pressures by a factor of, .85: and for single welded tube, multiply the above pressures by a factor of .80 (Reference ANSI B. 31, table A-1B)

COPPER TUBING

Chart #2

ANNEALED SEAMLESS TUBING (ASTM B-75
or Equivalent) BASIS: ALLOWABLE STRESS = 6,000 PSI between -20F and 100F. Factor of Safety = 5, considering tensile strength to be 30,000 PSI at room temperature.

REFERENCE: ANSI B31.4

O.D
TUBE
(IN)

WALL THICKNESS OF TUBE (INCHES)
0.028
0.035
0.049
0.065
0.083
0.095
0.109
0.12
1/8"
2,556
3,270
3/16"
1,644
2,112
3,100
1/4"
1,206
1,542
2,250
3,100
5/16"
1,212
1,758
2,468
3/8"
1,002
1,440
2,000
1/2"
738
1,056
1,454
1,884
5/8"
888
1,200
1,566
1,824
3/4"
732
990
1,284
1,494
1,740
7/8"
624
840
1,092
1,260
1,464
1"
540
732
948
1,092
1,266
1,410

CARBON STEEL TUBING

Chart #3

STRESS FACTORS

Chart #4
O.D
TUBE
(IN)

WALL THICKNESS OF TUBE (INCHES)
TEMPERATURE STRESS FACTORS
0.028
0.035
0.049
0.065
0.083
0.095
0.109
0.12
 TEMP.(F)
ASTM A-269 Stainless Steel
ASTM A-180
Carbon Steel
ASTM B-76 Copper
1/8"
6,688
8,556
3/16"
4,302
5,526
8,054
304
316
1/4"
3,156
4,035
5,888
8,054
100
1
1
1
1
5/16"
3,171
4,600
6,327
200
1
1
0.95
0.8
3/8"
2,622
3,768
5,165
300
1
1
0.9
0.78
1/2"
1,931
2,763
3,752
4,930
400
0.93
0.96
0.86
0.5
5/8"
1,633
2,324
3,140
4,098
4,773
500
0.87
0.9
0.82
0.13
3/4"
1,915
2,590
3,360
3,910
4,553
600
0.82
0.85
0.77
7/8"
1,633
2,198
2,87
3,297
3,831
700
0.8
0.82
0.75
1"
1,427
1,915
2,180
2,857
3,313
3,690
800
0.76
0.79
0.59
900
0.73
0.78
0.41

ANNEALED SEAMLESS TUBING (ASTM A-179 or Equivalent)  BASIS: ALLOWABLE STRESS = 15,700 PSI between -20F and 100F.
Factor of Safety = 4, considering tensile strength to be 47,000 PSI atroom temperature, tubing hardness should not exceed RB 72.

REFERENCE: ANSI B 31.3.
1000
0.69
0.76
0.16