Shim Sheets for Pipeline Alignment & Pipe Support

Shim sheets are thin metal plates used to fill gaps between pipe supports and the pipe itself. In pipeline construction, shim sheets ensure proper alignment, prevent stress on welds, and maintain the correct elevation across the entire pipeline route. Understanding how to select, install, and document shim sheets is essential for quality pipeline construction.

What Are Shim Sheets?

Shim sheets (also called shim plates or flat shims) are precision-cut metal pieces used to adjust the height, level, or alignment of pipe supports. They come in various thicknesses from 1/32 inch to 1/2 inch and are made from stainless steel, carbon steel, or galvanized steel depending on the project specification.

How Shim Sheets Are Used in Pipeline Alignment

During pipeline construction, pipe supports rarely sit perfectly level. Shim sheets are inserted between the pipe and the support saddle to correct any misalignment. This process is critical because even small misalignments can cause stress on pipe welds, accelerate corrosion, and lead to premature failure.

• Correcting elevation differences between pipe supports
• Leveling pipe supports on uneven terrain
• Adjusting pipe slope for proper drainage
• Compensating for fabrication tolerances
• Filling gaps after thermal expansion adjustments

Types of Shim Sheets for Pipeline Work

• Flat shim sheets — uniform thickness for parallel gap filling
• Tapered shim sheets — wedge-shaped for angular corrections
• Precut shim sheets — factory-cut to standard pipe support sizes
• Shim sheet packs — assorted thicknesses bundled together
• Laminated shim sheets — peelable layers for precise thickness adjustment

Shim Sheet Materials

The material of your shim sheets must match or exceed the corrosion resistance of the pipe support. Common materials include:

• Stainless steel shim sheets (304, 316) — for corrosive environments
• Carbon steel shim sheets — for general industrial applications
• Galvanized shim sheets — for outdoor and marine environments
• Brass shim sheets — for electrical isolation requirements

Recording Shim Sheet Data in the Field

Every shim sheet installation must be documented for quality control and traceability. Key data points include: support number, shim thickness, material grade, width, length, number of sheets in the stack, and taper direction if applicable.

Shim Sheet Stacking Best Practices

1. Minimize the number of shim sheets in a stack
2. Maximum recommended stack: 3 to 4 shim sheets
3. All shim sheets in a stack must be the same width and length
4. Tack weld or strap shim sheet stacks to prevent movement
5. Document every shim sheet in the stack individually

Conclusion

Shim sheets are a fundamental component of pipeline alignment and pipe support installation. Proper selection, installation, and documentation of shim sheets ensures long-term pipeline integrity. With ShimSheet, you can track every shim sheet digitally and generate reports instantly.