求翻译：The manufacturer shall also provide an inlet flanged steel pipe (500 mm long and matching diameter with bifurcation pipe) with provision for welding to the penstock at site. A dismantling joint of telescopic type shall be provided. Set of bolts, nuts and washers for all flanged joints shall also be provided. Necessary flanged drain for dewatering the turbine inlet shall also be provided in the spiral inlet pipe.是什么意思？

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