After welded pipes are treated by reducing tension mills known as "welded pipe seamless process". There are still some differences between welded pipe and seamless pipe in quality index.
焊管经张力减径机处理后有人称之为“焊管无缝化”，这种焊管与无缝钢管在一些质量指标上仍存在差异。
Discharge Pipe: Seamless steel, supported at the pump support plate and furnished with an expansion fitting at the casing connection to prevent strain on the pump.
排水管：无缝钢，在泵支撑板处支撑，在外壳连接处配有膨胀部件，以防止作用在泵上的张力。
Discharge Pipe: Seamless steel, supported at the pump support plate and furnished with an expansion fitting at the casing connection to prevent strain on the pump.
排水管：无缝钢，在泵支撑板处支撑，在外壳连接处配有膨胀部件，以防止作用在泵上的张力。
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