Slip Blinds at Pressures Causing Permanent Deformation

[+] Author and Article Information
Jaan Taagepera

 Chevron Energy Technology Co., 100 Chevron Way, Richmond CA 94802taageperaj@asme.org

Trevor G. Seipp

 Fluor Canada Ltd., 55 Sunpark Plaza, SE, Calgary, AB, Canada T2Y 3X6seippt@asme.org

J. Pressure Vessel Technol 129(2), 248-253 (Nov 10, 2006) (6 pages) doi:10.1115/1.2716428 History: Received January 23, 2006; Revised November 10, 2006

Slip blinds are frequently used for hydrotesting piping. In addition, when maintaining equipment or piping, the equipment or piping must be isolated to ensure a safe working environment. Separating flange pairs and inserting a blind flange against the process side prevents hazardous substances from entering the work area. Slip blinds are often used for this type of service. However, slip blinds are generally limited to low-pressure service since at excessive pressures the blind will become dished and may leak or become impossible to remove. For this paper, slip blinds of various sizes and thicknesses were hydrostatically tested to determine their deformation as a function of pressure. Nonlinear finite element analysis (FEA) was used to analytically determine the deformation of slip blinds. The goal of the testing and FEA was to determine allowable pressures that would limit permanent deformation of the blinds to specified values.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Slip blind used for hydrotesting an exchanger

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Figure 2

24in. and 14in. NPS slip-blind hydrotest rigs with Cl-300 flanges

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Figure 3

Typical slip-blind hydrotest rig

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Figure 4

Typical FEA model

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Figure 5

Comparison of hydrotest and nonlinear FEA residual deflections for 24in. blind

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Figure 6

Comparison of hydrotest and nonlinear FEA residual deflections for 14in. blind

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Figure 7

Comparison of hydrotest and nonlinear FEA residual deflections for 4in. blind

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Figure 8

Recommended maximum pressure for 0.250in. thick slip blinds

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Figure 9

Recommended maximum pressure for 0.375in. thick slip blinds

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Figure 10

Recommended maximum pressure for 0.500in. thick slip blinds




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