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Polyurethane elastomer for use in subsea pipeline insulation

A technology of polyurethane elastomers and insulating materials, applied in the field of polyurethane elastomers

Active Publication Date: 2016-04-20
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There remains the problem of finding a polyurethane elastomer system with suitable curing characteristics for subsea pipeline joining applications

Method used

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  • Polyurethane elastomer for use in subsea pipeline insulation
  • Polyurethane elastomer for use in subsea pipeline insulation
  • Polyurethane elastomer for use in subsea pipeline insulation

Examples

Experimental program
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Effect test

example 1

[0070] Examples 1 and 2 performed similarly or better than Comparative Sample A. After 2.5 minutes, the compressive strength of Example 1 was 4 psi to -5 psi (27 kPa to 35 kPa) higher than Comparative Sample 1 and remained higher throughout cure. Example 2 shows the effect of adding a small amount of epoxy resin to the formulation of the invention. At 2.5 minutes, the compressive strength was almost equal to that of Comparative Sample A and was easily exceeded during the later stages of curing.

[0071] Comparative Sample B shows the effect of replacing the mercury catalyst system with a blocked amidine. The compressive strength at 2.5 minutes is only about 20 psi (138 kPa), which represents an almost 50% drop compared to Comparative Sample A, and the compressive strength continues to build very slowly. This means that the block amidine catalyst is not nearly as good as the mercury catalyst system.

[0072] Comparative Sample C and Comparative Sample D show the effect of co...

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Abstract

Polyurethane systems that cure similarly to systems based on mercury catalysts contain 1,4-butanediol and a zinc carboxylate catalyst. These systems cure and develop green strength similarly to systems based on mercury catalysts. These systems are especially useful in making insulated pipe joints for subsea pipeline installations.

Description

technical field [0001] The present invention relates to polyurethane elastomers for use as insulation materials for submarine pipes. Background technique [0002] Subsea pipelines are used worldwide, among other uses, in conjunction with oil and gas production. These pipelines may extend for several miles in length. Due to its extensive length, the pipe must be manufactured in sections that are joined together before the pipe is laid. [0003] Tubes often require thermal insulation. Much of the insulation material can be applied shortly after the pipe section is manufactured and before it is properly installed on the seabed. However, the ends of the tube sections remain bare so that they can be joined together to form a duct. In most cases, the insulation is applied on site when the pipe sections are joined and when the pipe is laid. Alternatively, the segment joints and insulation application may be applied at a "pipe prefabricated base" usually located onshore. In th...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/76C08G18/22C08G18/08
CPCC08G18/6607C08G18/76C08G18/0895C08G18/222
Inventor A·斯蒂芬逊E·雷克斯罗德
Owner DOW GLOBAL TECH LLC
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