Methods of forming insulated pipeline bundles

B - Operations – Transporting – 28 – B

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B28B 21/70 (2006.01) B28B 1/50 (2006.01) C04B 28/02 (2006.01) C04B 38/10 (2006.01) F16L 9/19 (2006.01) F16L 59/14 (2006.01) F16L 59/147 (2006.01)

Patent

CA 2192640

Methods of forming highly insulated pipeline bundles made up of one or more flow lines positioned within a continuous larger diameter outer sleeve are provided. The methods basically comprise the steps of filling the space between the outside of the flow lines and the inside of the outer sleeve with a foamed cement composition comprised of hydraulic cement, water, a gas and a foaming agent, allowing the hydration reaction between the hydraulic cement and the water in the cement composition to take place, and then heating the hydrated cement composition to evaporate and remove excess water in the cement composition and thereby increase the insulating properties of the cement composition.

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