Pipe sizing is the process of determining the appropriate diameter of pipes used in plumbing and fluid transport systems. Proper sizing ensures that fluids flow efficiently without excessive pressure loss or risk of leaks. Factors such as flow rate, fluid type, and pipe material are considered during this process. Choosing the right pipe size is crucial for maintaining system performance and energy efficiency. If pipes are too small, they can cause blockages and increased pressure, while oversized pipes may lead to higher installation costs and inefficient flow. Accurate calculations help in selecting the best size for specific applications, such as water supply or gas distribution.