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PVC pipes are primarily measured based on their diameter and wall thickness, which determines their Schedule number (e.g., Schedule 40, Schedule 80). The diameter can be referred to as either nominal or outer diameter. The nominal diameter gives a rough idea of the inner diameter but does not exactly match due to varying wall thickness. Measurement is done in inches in the United States, and in millimeters in many other parts of the world. Wall thickness, along with diameter, affects the pipe’s pressure rating. It's crucial to know both measurements when selecting PVC pipes for specific applications to ensure they can handle the required pressure and volume of fluid without failure.
Injecting epoxy into concrete cracks requires precision and the right tools. First, clean the crack thoroughly to remove dust and debris. Use a wire brush and compressed air to ensure it's clean. Next, apply a concrete etching solution to improve adhesion. After cleaning, install an epoxy injection port along the crack at regular intervals using a strong adhesive. Once set, connect a cartridge of epoxy resin to an injection gun and attach it to the first port. Begin injecting epoxy, ensuring a consistent flow. As epoxy fills, move to the next port. Overfill slightly to ensure complete crack saturation. Cure time varies by product, so follow manufacturer instructions. Epoxy injection is ideal for structural repairs as it strengthens the concrete and prevents water ingress.
Yarn in front (YIF) and yarn over (YO) are terms used in knitting that relate to the placement of yarn, but they serve different purposes. YIF is a specific instruction to bring the yarn to the front of the work, usually as part of a stitch or when switching between knit and purl stitches. It's a positional instruction without creating an extra stitch. On the other hand, YO is a method to intentionally create an extra stitch on your needle, often used in lace patterns to create holes or increase the stitch count. YO involves wrapping the yarn around the needle, which can be done from various positions depending on the previous and following stitches but often results in the yarn ending up in front ready for the next stitch. While YIF and YO may look similar in execution, especially in transitions between knit and purl stitches, their purposes in a pattern are distinct.
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