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DHOT Heavy Weight Drill Pipe is manufactured from 4145H MOD Q&T steel with a hardness range of 285-341 BHN and offered as conventional or spiral.
The connections comply with dimensional requirements specified in API Spec. 7 and guidelines presented in API RP7G. All connections are phosphate-coated to improve resistance to galling as well as “cold rolled” to provide longer fatigue life.
API stress relief groove pin and bore back box are available upon request.
When ordering, please specify:
HWDP OD HWDP bore ID Length if not standard (31 ft.) Conventional or Spiral Size and Type of Connections, example: NC 50 box up x NC 50 pin down Cast or pressed steel thread protectors Hard banding Internal Plastic Coating
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