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Parker Hannifin Corporation

Instrumentation Products Division

Huntsville, AL USA

http://www.parker.com/ipdus

Note:

•

All working pressures have been calculated

•

All calculations are based on maximum outside

using the maximum allowable stress levels in

diameter and minimum wall thickness.

accordance with ANSI B31.3, Chemical Plant

•

All working pressures are ambient (72

F or 22

and Petroleum Refinery Piping Code, 1999

temperature.

Edition.

SystemTemperature

Operatin

g temperature is anothe

r factor in determining the proper tubing material. Copper and aluminum tubing are suitable for low temperature media.

Stainles

s steel and carbon steel

tubing are suitable for higher temperature media. Special alloys such as Alloy 600 are recommended for extremely high

tempera

tures

(see Table 1)

. Tabl

e 8 lists derating factors which should be applied to the working pressures listed in Tables 2-7 for elevated temperature

conditio

ns. Simply locate the co

rrect factor in Table 8 and multiply this by the appropriate value in Tables 2-7 for elevated temperature working pressure.

EXAMPLE:

1/2 inch x .49 wall seamless 316 stain-

less steel tubing has a working pressure of 3700

psi @ room temperature. If the system were to

operate @ 800

F (425

C), a factor of 80% or (.80)

would apply (see Table 8 above) and the “at tem-

perature” system pressure would be 3700 PSI x

.80 = 2960 PSI.

Table 8

Temperature Derating Factors

Temperature

Monel

°F

(°C)

Copper Aluminum 316 SS

304 SS

Steel

400

100

(38)

1.00

200

(93)

.80

1.00

.96

.88

300

(149)

.78

.81

1.00

.90

.82

400

(204)

.50

.40

.97

.94

.86

.79

500

(260)

.90

.88

.82

.79

600

(316)

.85

.82

.77

.79

700

(371)

.82

.80

.73

.79

800

(427)

.80

.76

.59

.76

900

(486)

.78

.73

1000

(538)

.77

.69

1100

(593)

.62

.49

1200

(649)

.37

.30

Table 4

CARBON STEEL (Seamless)

Tube

O.D.

Size 0.028 0.035 0.049 0.065 0.083 0.095 0.109 0.120 0.134 0.148 0.165 0.180

1/8 8100 10300

3/16 5200 6700 9700

1/4 3800 4900 7100 9700

5/16

3800 5500 7700

3/8

3100 4500 6200

1/2

2300 3300 4500 6000

5/8

1800 2600 3500 4600 5400

3/4

2200 2900 3800 4400 5100

7/8

1800 2500 3200 3700 4300

1600 2100 2800 3200 3700 4100

1-1/4

1700 2200 2500 2900 3200 3700 3800

1-1/2

1800 2100 2400 2700 3000 3400 3800 4000

1600 1800 2000 2200 2500 2800 3000

Table 6 ALUMINUM (Seamless)

Tube

O.D.

Size 0.035 0.049 0.065 0.083 0.095

1/8 8700

3/16 5600 8100

1/4 4100 5900

5/16 3200 4600

3/8 2600 3800

1/2 1900 2800 3800

5/8 1500 2200 2900

3/4

1800 2400 3200

7/8

1500 2100 2700

1300 1800 2300 2700

Table 5

COPPER (Seamless)

Tube

O.D.

Size 0.010 0.020 0.028 0.035 0.049 0.065 0.083 0.095 0.109 0.120

1/16 1700 3800 5400 6000

1/8

2800 3600

3/16

1800 2300 3500

1/4

1700 2600 3500

5/16

1300 2000 2800

3/8

1100 1600 2300

1/2

800 1200 1600 2200

5/8

900 1300 1700 2000

3/4

800 1000 1400 1600 1900

7/8

600 900 1100 1300 1600

600 800 1000 1200 1400 1500

1-1/8

700 900 1000 1200 1300

Table 7

MONEL 400 (Seamless)

Tube

O.D.

Size 0.010 0.020 0.028 0.035 0.049 0.065 0.083 0.095 0.109 0.120

1/16 5900 12600 17000

1/8

8600 11000

3/16

5500 7100 10300

1/4

4000 5100 7500 10300

5/16

4000 5900 8100

3/8

3300 4800 6600

1/2

2300 3300 4500 5900

5/8

2800 3700 4900 5700

3/4

2300 3100 4000 4600 5400

2300 2900 3400 3900 4400

D30003 77

5/12/05