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Guide gas Velocity
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Allowable max Nat Gas velocity in pipelines, as a function of operating pressure (50 oC)Assumed temperature oC 50 50 50 50 50 50 50Operating pressure Barg 75 40 15 10 5 2 0.2Natural gas MW kg/kgmol 20.43 20.43 20.43 20.43 20.43 20.43 20.43
0.84 0.92 0.98 0.98 0.99 0.99 1.00kg/m3 68.6 33.9 12.5 8.6 4.6 2.3 0.9
Allowable max gas velocitya Erosional velocity, API 14E (1984) m/s 14.7 20.9 34.6 41.7 56.7 80.3 126.9b m/s 29.5 41.9 69.1 83.4 113.4 160.7 253.7a' Allowable max gas velocity per a m/s 7.4 10.5 17.3 20.8 28.4 40.2 63.4b' Allowable max gas velocity per b m/s 14.7 20.9 34.6 41.7 56.7 80.3 126.9c Per Norsok standard P-001 m/s 28.4 38.4 59.2 60.0 60.0 60.0 60.0
NOTESb non corrosion service without solid particles, C=200 lb/s/ft2 per API 14E (1984).a' considered as 50% of erosional velocity per ab' considered as 50% of erosional velocity per b
Gas compressibility factor (assumed)
Gas density (at operating conditions)
As above, no corrosion/solid particles
0 10 20 30 40 50 60 70 80 900
10
20
30
40
50
60
70
80
90
100
Series a'
Series b'
Series c (Norsok)
Pressure, barg
All
ow
able
max
vel
oci
ty,
m/s
Allowable max CH4 (g) velocity in pipelines, as a function of operating pressure (15 oC)Assumed temperature oC 15 15 15 15 15 15 15Operating pressure Barg 80 40 15 10 5 2 0.2
kg/kgmol 16 16 16 16 16 16 16Gas compressibility factor 0.85 0.92 0.98 0.98 0.99 0.99 1.00
kg/m3 63.4 29.8 10.9 7.5 4.1 2.0 0.8Allowable max gas velocity
a Erosional velocity, API 14E (1984) m/s 15.3 22.3 36.9 44.5 60.5 85.7 135.4b m/s 30.6 44.7 73.8 89.0 121.0 171.5 270.7a' Allowable max gas velocity per a m/s 7.7 11.2 18.4 22.2 30.3 42.9 67.7b' Allowable max gas velocity per b m/s 15.3 22.3 36.9 44.5 60.5 85.7 135.4c Per Norsok standard P-001 m/s 29.4 40.7 60.0 60.0 60.0 60.0 60.0
NOTESb non corrosion service without solid particles, C=200 lb/s/ft2 per API 14E (1984).a' considered as 50% of erosional velocity per ab' considered as 50% of erosional velocity per b
Natural gas MW (assumed 100% CH4)
Gas density (at operating conditions)
As above, no corrosion/solid particles
0 10 20 30 40 50 60 70 80 900
10
20
30
40
50
60
70
80
90
100
Series a'
Series b'
Series c (Norsok)
Pressure, barg
All
ow
able
max
vel
oci
ty,
m/s
