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Proposed Pipe Size To Be Used :
SURE-LINE High Density Polyethylene Pipe (HDPE):
Other Properties :
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| Wall Thickness |
0.3125 inches |
| Outside Diameter (O.D.) SURE-LINE |
7.8280 inches |
| Inside Diameter (I.D.) SURE-LINE |
7.2030 inches |
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Existing Steel Pipe : |
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| Original Wall Thickness |
0.331 inches |
| Weight of Pipe |
26.68 lbs/lf |
| Strength |
145.00 psi |
| Outside Diameter (O.D.) |
8.740 inches |
| Inside Diameter ( I.D.) |
8.079 inches |
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| Modulus of elasticity: |
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tension |
15,000,000 psi |
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Compression |
6,000,000 psi |
Calculation of Design Pressure: |
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| The maximum pressure determined by 49 CFR 192.123 for a single plastic pipe is: |
100 psi |
| The lowest operating temperature for plastic pipe as per code is: |
-29 ° C, -20 ° F |
Maximum operating temperature at 100 psi pressure class for Thermoplastic (DOT limits) ; wall thickness minimum 1.57mm (0.062 inches) is:
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60 ° C, 140 ° F |
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The design pressure for gas lines is determined According to AGA formula as follows:
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| P= 2*S*F/(R-1) – 2*S*t*F/ (D-t) |
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| T= PD/(P+2*S*F) |
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| Design Pressure |
P = ? psi |
| Outside Diameter |
D= 7.828 inches |
| The Long Term Hydrostatic Strength |
S= 1.600 psi |
| The Wall Thickness |
t= 0.313 inches |
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The design factor used to compensate for stresses other than internal pressure, such as bending in installation, earth loading, subsidence, temperature changes and fitting compressions, all applicable to freely buried plastic pipe, is allocated to be 0.32 by GA CFR 192.121.
In absence of the factor determined for SURE-LINE pipe, which is restrained pipe, the design factor will be:
F= 0.50
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