If steam is available it can provide an effective choice for winterizing instrument impulse lines. Providing temperature maintenance with steam is more difficult than with electric tracing. This is true unless you want to maintain your process at the approximate temperature of the saturated steam pressure available.
Light tracing (TPL) places a measure of insulation between the steam tracer and the process tube. It is generally used to provide freeze protection for instrument impulse lines and process lines for analyzers. Light steam tracing provides protection over a longer length than than heavy traced designs.
Heavy tracing (TPH) keeps the process tubing in direct contact with the tracer, and maintains higher process temperatures. It is used to provide process temperature maintenance for impulse lines for instrumentation, process lines for analyzers, sampling, additives and other small process lines.
Heavy tracing maintains close temperature profiles through seasonal ambient temperature changes providing consistent process temperature over a wide ambient temperature range.
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