ISO 3715-2:2001

Overview

ISO 3715-2:2001 - "Ships and marine technology - Propulsion plants for ships - Part 2: Vocabulary for controllable‑pitch propeller plants" is an ISO vocabulary standard that defines terms and definitions specifically for continuously variable, hydraulically operated controllable‑pitch propeller (CPP) units. It standardizes nomenclature for components, control functions and operating conditions of CPP systems to ensure consistent communication across design, manufacture, operation and regulation of ship propulsion plants.

Key topics

This part of ISO 3715 focuses on terminology and clear definitions rather than prescriptive performance limits. Major technical topics covered include:

• Types of controllable‑pitch propellers: reversible, non‑reversible and those including a feathering position.
• Mechanical components: blade, blade attachment, blade bearing, hub, hub connection, propeller shaft and intermediate shaft.
• Hydraulic and control elements: hydraulic unit, servomotor, oil‑distribution box, oil‑transfer tube, pitch‑actuating rod, control transmission and control mechanism.
• Control and feedback: control unit, control system (remote and manual), pitch control, feedback system and pitch indicator.
• Pitch terminology: design pitch, nominal pitch, maximum ahead/astern pitch, commanded pitch, actual pitch, tolerance of pitch setting, time for pitch changing, zero thrust and feathering positions.
• Hydraulic pressures: nominal pressure, testing pressure, pitch‑changing pressure and pitch‑keeping pressure.
• Ancillary concepts: take‑home equipment, windmilling and flange protection.

The standard excludes CPP units that offer only a few fixed pitch settings and refers to ISO 3715‑1 for general propeller geometry vocabulary.

Applications

ISO 3715‑2 is valuable wherever precise, unambiguous terminology for controllable‑pitch propeller plants is required:

• Marine architects, naval engineers and shipyards for design and technical documentation.
• CPP manufacturers and hydraulic/control systems suppliers for product specifications, drawings and manuals.
• Classification societies and regulatory bodies for inspection, certification and reporting.
• Ship operators, maintenance teams and training providers for operation procedures, troubleshooting and technical training.
• Software and systems engineers developing control or simulation tools that model CPP behavior.

Using this standardized vocabulary improves clarity in contracts, technical publications, spare‑parts lists, maintenance instructions and safety procedures.

Related standards

• ISO 3715‑1 - Ships and marine technology - Propulsion plants for ships - Part 1: Vocabulary for geometry of propellers (normative reference for propeller geometry terminology).

Keywords: ISO 3715-2, controllable-pitch propeller, CPP, vocabulary, ships and marine technology, propulsion plants, hydraulic propeller units, pitch control, marine engineering standards.