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Link Seal Calculator

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The Link Seal Calculator is a practical tool designed to simplify the task of calculating the number and size of link seals needed to create a watertight and airtight seal around pipes that pass through walls, floors, or casings. This calculator is especially useful for engineers, plumbers, and construction professionals who need to ensure the integrity of piping systems in various installations.

Purpose and Functionality

Link Seals are crucial components in maintaining the safety and durability of piping systems. They prevent the ingress of water, dirt, and other contaminants, which can compromise the system’s effectiveness and longevity. The primary function of the Link Seal Calculator is to provide a quick and accurate estimation of the seals required based on the dimensions of the pipe and the penetration opening.

The calculator uses specific inputs to perform its calculations:

  • Dp (Pipe Outer Diameter): The external diameter of the pipe, which can be measured in inches or millimeters.
  • Do (Opening Diameter): The diameter of the hole through which the pipe passes, also in inches or millimeters.
  • W (Wall Thickness): The thickness of the wall, floor, or casing surrounding the pipe, measured in the same units.

Based on these inputs, the calculator performs a series of calculations to determine the gap to be sealed and the corresponding number of Link Seals required.

Step-by-Step Examples

Let’s consider an example to illustrate how the calculator works:

  • Pipe Outer Diameter (Dp): 4 inches
  • Opening Diameter (Do): 6 inches
  • Wall Thickness (W): Not applicable in this calculation but important for selecting the right seal length.

Step 1: Calculate Gap

6−4=2G=DoDp=6−4=2 inches

This step identifies the total gap around the pipe that needs to be sealed.

Step 2: Determine Number of Link Seals Required

Assuming a fixed seal width per module (S) of 0.5 inches, the calculation would be:


Thus, four Link Seal modules would be required to seal the gap.

Information Table

InputSymbolExample Value
Pipe Outer DiameterDp4 inches
Opening DiameterDo6 inches
Wall ThicknessWN/A
Gap to be SealedG2 inches
Number of SealsN4


The Link Seal Calculator is an invaluable tool for professionals in the construction and plumbing sectors, streamlining the process of determining the necessary components for sealing pipe penetrations. By providing a clear and straightforward way to calculate the number of seals required, it not only saves time but also helps in avoiding errors and ensuring the integrity of the installation. Its application spans across various industries, including water treatment, construction, and any field where piping systems are crucial. This calculator, therefore, not only facilitates a smoother workflow but also contributes significantly to the overall safety and efficiency of construction and maintenance projects.

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