IADC	WOB	RPM	Applicable Formations
	(KN/MM)	(r/min)
	(Bit Dia)
116 117	0.35~0.8	150~80	Very soft formations with low compressive strength and high drillability,such as clay,mudston,chalk etc.
136 137	0.35~1.0	120~60	Soft to mesium soft formations with low compressive strength and high drillability.such as medium soft shale,hard gypsum,medium soft limestone.medium soft sandstone soft formation with harder nterbeds,ect.
216 217	0.4~1.0	100~60	Medium hard formations with high compressive strength,such as medium soft shale,hard gypsum,medium soft limestone,medium soft sandstone,soft formation with harder interbeds ect.
246 247	0.4~1.0	80~50	Medium hard formations with high compressive strength,such as abrasive shale.limestone,sandstone,dolomite,hard gypsum,marble,ect.
417 437	0.35~0.9	150~70	Very soft formations with low compressive strength and high drillability,such as clay,mudston,chalk,gypsum,salt,soft shale,soft limestone,etc.
447
517 527	0.35~1.0	140~60	Soft formations with low compressive strength and high drillability,such as mudstore,gypsum,salt,soft shale.soft limestone,ect.
537 547	0.45~1.0	120~50	Soft to medium formations with low compressive strength,such as medium soft shale,medium soft limestone,medium soft sandstone,medium formation with harder and abrasiver interbeds,ect.
617 627	0.45~1.1	90~50	Medium hard formations with high compressive strength,such as hard shale,limestone,sandstone,dolomite,ect.
637	0.5~1.2	80~40	Hard formations with high compressive strength,such as sandstone,limestone,dolomite,hard gypsum,marble,ect.

FAQ

 

Xuzhou Hengxing Jinqiao Machinery Technology Co., Ltd covers an area of more than 50 acres and with factory area about 20000 square meter.We are the professional construction machinery manufacture for rotary drilling rig kelly bar, highway guardrail pile driver and PV post driver, with our own R&D and sales team. Over the years we keep strengthening our independent research and development ability,meanwhile we actively join the China Construction Machinery Association to learn the latest news of this industrial. Also we continue to strengthen our cooperation relationship with China University of Mining and Technology and pursue of development and innovation of our techniques. We have passed the international Quality Certification of ISO9001:2008,our engineers are skilled in using AUTO-CAD,PRO-E and UG to design products, for the development of new products, they strictly implement the APQP&PPAP program. We provide customized services and all products meet the ISO9001 standard,also we have filed many patents. Our main product kelly bar absorbs a number of advanced technology from home and abroad , with special advantages of high wear resistance and high torque, now we are the nominated supplier of kelly bar for rotary drilling rig manufactures from both home and abroad, such as BAUER, SOILMEC, CMV, MAIT, IMT, XCMG,ZOOMLION,CSR,CHTC JOVE,OSAINT etc., in addition, our kelly bar enjoys a good market among the end-user customers for construction work such as high-speed railway, highway,urban viaduct,light rail,bridge,high-rise buildings and so on. We have enjoyed a good reputation among customers for many years based on our reliable quality and perfect services.Other products include the multifunctional exchange highway guardrail post driver and the multifunctional hydraulic crawler PV post driver. Now our post driver has been widely used in construction fields such as highwayguardrail install, PV power station install, farm and orchard construction.