DTH Drill Pipe for Sale from a China Manufacturer

The correct DTH drill pipe must match the entire drilling system. Selecting a pipe only by outside diameter can result in incompatible connections, unnecessary weight, insufficient air delivery or difficult handling at the job site.

Before placing an order, confirm the following factors:

For example, a water well contractor should provide the target depth, hole diameter, formation, rig model, hammer model and compressor parameters. A mining contractor should also explain expected rock abrasiveness, drilling angle and operating cycle. For a broader explanation of available drilling pipe categories, visit Weilida’s drill pipe product range.

DTH Drill Pipe, Hammer and Bit Compatibility

The DTH drill pipe connects the drilling rig to the hammer and provides a passage for compressed air. The drill pipe, hammer, bit and adapter therefore need compatible dimensions and connections.

A complete DTH drill string normally includes:

1. Drilling rig rotary head

2. Top sub or adapter sub

3. DTH drill pipe

4. DTH hammer

5. DTH drill bit

Before production, provide the connection specifications at both ends of the drill string. Weilida can use this information to check whether the selected pipe thread matches the DTH hammer and DTH drill bit. When an existing rig and hammer use different thread systems, an adapter sub may be required. Buyers should provide equipment manuals, thread drawings or clear connection photographs whenever the thread specification is uncertain.

Compatibility Checklist

• Drilling rig model

• Rotary head or top-sub thread

• DTH hammer brand and model

• Hammer upper connection

• DTH bit diameter

• Target borehole diameter

• Compressor working pressure

• Required pipe OD and length

DTH Drill Pipe Manufacturing Process

A controlled production process is essential because the pipe body, welded area and threaded connection experience repeated torque, impact and loading during drilling.

Weilida’s DTH drill pipe production process includes:

1. Steel Pipe Selection
   The pipe body is selected according to the required diameter, wall thickness and steel grade.

2. Pipe-End Processing
   The ends are processed to prepare the pipe body for connection with the tool joint.

3. Tool Joint Machining
   The pin and box components are machined according to the required REG, IF or NC connection.

4. Friction Welding
   The tool joint is joined to the pipe body through friction welding.

5. Post-Weld Heat Treatment
   The welded connection area is heat-treated after welding.

6. CNC Thread Machining
   Threads are machined using CNC lathes and forming cutters according to the selected connection.

7. Thread Gauge Inspection
   Pin and box threads are checked using corresponding thread gauges.

8. Surface Protection
   Surface protection, thread protectors and product identification are applied before packaging.

You can view more information about Weilida’s drill pipe manufacturing equipment.

DTH Drill Pipe Applications

Water Well Drilling

DTH drilling is widely used for water wells in rock formations. The drill pipe must match the water well drill rig, hammer, compressor, hole diameter and target depth.

For projects that require a different water well pipe configuration, view Weilida’s water well drill pipe range.

Mining and Quarry Drilling

Mining and quarry projects often involve hard or abrasive formations, repeated rod handling and continuous drilling cycles. Pipe diameter, steel grade, wall thickness and thread selection should account for operating load, hole depth and rock conditions.

Geothermal Drilling

Geothermal boreholes may require long drill strings and stable air delivery. Buyers should confirm the planned depth, formation changes, drilling rig capacity and connection system before selecting the pipe.

Foundation and Construction Drilling

DTH drill pipes can be used in foundation holes, anchoring, slope support and other construction drilling applications. Pipe length should be selected according to the rig mast and available handling space.

For examples of Weilida’s drilling applications, visit the drilling project cases.

DTH Drill Pipe FAQs

What is a DTH drill pipe used for?

A DTH drill pipe connects the drilling rig to the down-the-hole hammer. It transfers rotation and compressed air while supporting the hammer and bit during rock drilling.

What DTH drill pipe sizes does Weilida offer?

The current range covers outside diameters from 3 inches to 5.5 inches, equivalent to 76–140 mm. Available lengths range from 1,000 mm to 9,000 mm, depending on the pipe diameter.

Which thread types are available?

Available connections include REG, IF and NC threads, such as 2-3/8 REG, 2-3/8 IF, NC26, 2-7/8 IF, NC31, NC35, 3-1/2 IF, NC38, 4 IF and NC46.

How do I match a DTH drill pipe with a hammer?

Provide the hammer model, hammer upper connection, drilling rig connection, bit diameter and required pipe size. If the rig and hammer have different thread types, an adapter sub may be needed.

Which steel grades are available?

Weilida offers R780, G105 and S135 options. The correct grade should be selected according to pipe dimensions, drilling depth, load and operating conditions.

Can the pipe length and wall thickness be customized?

Yes. Available standard ranges vary by outside diameter, and project-specific lengths or wall thicknesses can be discussed before production.

What is the difference between a DTH drill pipe and a water well drill pipe?

DTH drill pipe refers to pipe used as part of a down-the-hole hammer drilling system. Water well drill pipe is categorized mainly by application and may use different dimensions or connection configurations depending on the rig and drilling method. Some water well projects use DTH drill pipes, but the final pipe should be selected according to the complete drilling system.