Replacement main having nozzle and vanes
作者： Anthony D. Elgar , Brian T. Sales , Adrian S. Parkes
DOI:
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摘要: A method is provided for replacing a length of branch gas main 1 joined to spine 2 with replacement 7 having an outer diameter smaller than the inner main. In access gained bore and one end fed along via point towards until has been replaced. During after feeding step prevented from entering any clearance 20 between mains by means head 9 attached leading 7. After sealant 25 injected into form seal within 20.
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