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Over the past two decades in the HDD industry, the use of wash pipe for surface casing has become more popular. Introducing Holly Pipe’s revolutionary solution: N-Series Casing, Available in 7 to 18 5/8 inch OD, and 15, 20, 32 & 46 foot lengths. Stabilize the pilot bore, prevent hydro-fractures and cave in, and create a suitable backstop for pushing drill pipe. Our N-Series Casing remedies a plethora of hang-ups related to drilling in alluvial formations. The picture below shows a driller utilizing N-Series Casing (16” OD) on a West coast shore approach as assistants make up a connection with manual tongs. N-Series Casing is unique as it can be reused over and over again, making up and breaking out with manual or hydraulic tongs. The value of keeping inadvertent returns at bay is priceless, and instead of wasting time welding or losing valuable mud, N-Series Casing can help realize profitable returns by enabling drillers to “in-case” the surface of the bore hole.

Pipe Body Data

• Nominal OD 16.000 in
• Nominal Wall 0.656 in
• Nominal Weight 109.00 lb/ft
• Plain End Weight 107.60 lb/ft
• Material Grade API Q-125
• Mill/Specification API
• Yield Strength 125,000 psi
• Tensile Strength 136,000 pai
• Nominal ID 14.688 in
• API Drift Diameter 14.500 in
• Special Drift Diameter NONE
• RBW 87.5%
• Body Yield 3,953,000 lbf
• Burst 8,970 psi
• Collapse 3,520 psi

Connection Data

• Standard OD 16.000 in
• Pin Bored ID 14.625 in
• Critical Section Area 18.583 in
• Tensile Efficiency 58.8%
• Compressive Efficiency 33.9%
• Longitudinal Yield Strength 2,323,000 Ibr
• Compressive Limit 1,340,000 lbf
• Internal Pressure Rating 8,217 psi
• External Pressure Rating 3,100 psi
• Maximum Bend 14.8/100 ft

Operational Data

• Min Shoulder Torque 3,500 ft'lbf
• Max Shoulder Torque 11,600 t'lbf
• Minimum Makeup Torque 35,000 ft'lbf
• Optimum Makeup Torque 38,000 ft'lbf
• Maximum Makeup Torque 41,000 ft'lbf
• Minimum Yield 120,900 ft'lbf
• Makeup Loss 5.36 in