ISO 27627:2014

Overview

ISO 27627:2014 - Petroleum and natural gas industries - Aluminium alloy drill pipe thread connection gauging - defines gauging, inspection and acceptance requirements for aluminium alloy drill pipe manufactured in accordance with ISO 15546. The standard covers technical delivery conditions, manufacturing process aspects, material requirements, configuration and dimensional definitions, and the verification procedures and gauging methods for taper buttress threads (right and left) and adjoining tapered stabilizing shoulders on aluminium drill pipes and associated steel tool joints.

Key topics and technical requirements

• Scope and purpose: Establishes how to gauge and verify aluminium alloy drill pipe thread connections to ensure interchangeability and safe performance in petroleum and natural gas operations.
• Gauging procedures: Prescribes gauging for taper buttress threads and tapered stabilizing shoulders (bores), including measurement planes, reference planes and pitch definitions.
• Types of gauges: Defines working and master gauge families such as:
  • R (working screw plug gauges),
  • G / G‑S (working plain plug/ring gauges for thread and bore gauging),
  • R‑P / R‑N (working screw ring gauges, perfect and not-perfect profiles),
  • K‑G‑R / K‑G‑G / K‑G‑G‑S (master gauges used for calibration).
• Thread profile, dimensions and tolerances: Includes detailed nominal dimensions and limit deviations for common thread sizes and profiles (tables and figures specify diameters, gauge planes and thread form).
• Taper deviation limits: Example limits from the document include:
  • R plug gauge: 0 mm / +0.020 mm
  • R‑P and R‑N ring gauges: −0.010 mm / −0.035 mm
• Manufacturing and inspection: Specifies manufacturing technical requirements for gauges, marking, packaging, storage, and procedures for servicing, calibration and verification of gauges.

Practical applications and users

ISO 27627:2014 is intended for stakeholders involved in the production, inspection and use of aluminium alloy drill pipes:

• Drill pipe manufacturers - use for production tolerancing, tooling and acceptance criteria.
• Gauge designers and metrology labs - design and calibrate screw and plain gauges to the specified profiles.
• Quality assurance / QC inspectors - perform in‑plant gauging and final inspection per the standard’s procedures.
• Tool joint and tubular component manufacturers - ensure compatibility between aluminium pipe threads and steel tool joints.
• Operators and service companies - verify thread fitment, fatigue‑resistant stabilizing shoulders and interchangeability in the field.

Keywords: ISO 27627:2014, aluminium alloy drill pipe, drill pipe thread connection gauging, taper buttress thread, gauges, petroleum and natural gas industries, ISO 15546.

Related standards

• ISO 15546 - Aluminium alloy drill pipe (manufacturing basis referenced by ISO 27627)
• Normative references cited in the draft include EN 10027‑2 and ASTM A370 for designation and mechanical testing contexts.