CJT 246-2018 on upper and lower drainage types of water repellents
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CJT 246-2018 \"Pre-fabricated directly-buried steam insulation pipes and pipeline accessories for urban heating\" eliminates the upward drainage type of drain valve specified in the 2007 version of the standard, leaving only the downward drainage type of drain valve. Why? Chemical Engineering Discussions
Standard CJT 246-2018 eliminates the upper-drainage type of drainage system in favor of the lower-drainage type; this is because the lower-drainage method is more effective for maintenance and for removing water accumulation within the vapor drainage system, thereby ensuring the safety and stability of the piping system. The upward drainage method may cause blockages inside the pipes, affecting the efficiency of the steam system. .
That makes sense, thanks for the reply!