The said process has a finished product rate higher than 95% and a sprue and riser head system weight lower than 20 wt% of the casting.

所得铸件的成品率为95％以上，浇冒口系统重量占铸件重量的20％以下。

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These loads are transferred through the riser to the well - head and casing system, causing fatigue at critical connectors and welds.

这些载荷通过立管传递到井口和套管，在连接和焊接处形成临界疲劳区。

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