THERMO-ISOLATED PIPE Russian patent published in 2004 - IPC

Abstract RU 2243348 C2

FIELD: oil and gas extractive industry.

SUBSTANCE: pipe has inner and outer pipes placed coaxially with forming of ring space between them. Ring space is pressurized, thermo-isolation is placed therein and vacuum is formed. Pressurized to 10-13 Pa space is filled with inert gas having low thermo-conductivity coefficient under pressure, calculated from formula P=P_v+K·P_pt, where P - pressure of inert gas forcing, Pa, P_v - value of vacuum formed in ring space, Pa, K - coefficient considering properties of inert gas; P_pt - partial hydrogen pressure, Pa.

EFFECT: higher reliability and durability.

1 dwg

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RU 2 243 348 C2

Authors

Fel'Dman I.M.

Shchapin V.M.

Shchapin I.V.

Korshunov V.N.

Dates

2004-12-27—Published

2003-01-20—Filed