Pipeline Strainers
Rust, dirt, metal chips, scale, and other impurities are commonly found in both new and old pipelines. Unless these impurities are captured and removed from the pipes, they can damage valves, traps, and other equipment. Protection against these potentially damaging impurities is provided by installing a strainer or scrape strainer ahead of each mechanical device in the pipeline. Strainers are constructed with a screen socket placed at an angle to the nor- mal direction of flow. The impurities are captured by the screen.
Two typical examples of pipeline strainers are shown in Figures 10-66 and 10-67. These devices are constructed from bronze, semisteel, and steel, and are available in a variety of sizes. The screen socket is tapered and positioned to collect the impurities suspended in the steam or hot water. Both standard and specially designed screens are available from manufacturers.
