The cast iron flanges minimize the need of pipe unions and fittings while offering ease of installation and maintenance.
铸铁法兰对管道活结和配件要求达到最小化，可提供简便的安装和保养。
All rig personnel should not attempt to tighten or loosen unions or other connections of pipe under pressure.
任何井队人员都不能在带压力的情况下松紧由壬或其他管线的连接。
All rig personnel should not energy to tighten or loosen unions or other connections of pipe under pressure.
任何井队人员都不能在带压力的情形下松紧由壬或其他管线的连接。
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