ISO 8278-2016 PDF

Full title and description

ISO 8278:2016 — Aerospace series — Hydraulic, pressure compensated, variable delivery pumps — General requirements. This International Standard specifies the general requirements, design and test characteristics for pressure-compensated variable-delivery hydraulic pumps intended for aircraft hydraulic systems (service up to 35 000 kPa / 5 000 psi) and is intended to be used together with application-specific detail specifications.

Abstract

ISO 8278:2016 establishes performance, construction, strength and test requirements for pressure‑compensated, variable‑delivery hydraulic pumps used in aerospace hydraulic systems. It defines rated discharge pressure classes, limits for pressure pulsation and transient behaviour, case‑drain and shaft‑seal leakage requirements, overspeed and torque conditions, stability and fatigue criteria, material and sealing guidance, and requirements for maintainability and markings. The standard is intended to be complemented by a detail specification tailored to each application.

General information

• Status: Published (Confirmed international standard).
• Publication date: March 2016 (2016-03).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 49.080 (Hydraulics and pneumatics).
• Edition / version: Edition 2 (2016).
• Number of pages: 44.

Scope

This standard applies to pressure‑compensated, variable‑delivery hydraulic pumps suitable for use in aircraft hydraulic systems up to rated discharge pressures of 35 000 kPa (5 000 psi). It gives general requirements that are to be used in conjunction with detail specifications specific to the application, covering performance, strength, endurance, dynamic behaviour, sealing, lubrication, construction, maintainability and tests necessary to verify compliance.

Key topics and requirements

• Rated discharge pressure classes (Table of classes up to 35 000 kPa / 5 000 psi) and tolerances for rated pressure.
• Performance requirements: minimum/maximum discharge flow, response times, pressure pulsation limits and pressure‑stability criteria.
• Case‑drain flow and shaft‑seal leakage limits; requirements for specifying minimum/maximum case flow and allowable dynamic seal leakage.
• Overspeed and direction‑of‑rotation requirements, including capability to operate at defined overspeed percentages and labeling of rotation.
• Torque limits for rated and zero‑flow conditions; port strength and mounting torque requirements.
• Transient behaviour and maximum transient pressure limits; recovery/stability criteria following flow changes.
• Construction and materials: sealing (reference to ISO 3601‑1 series A for seals), self‑lubrication by hydraulic fluid, balance of rotating parts, and requirements for replaceability and repairability.
• Fatigue and pressure‑impulse requirements, including specification of duty cycles and testing for cyclic loads.
• Design for maintainability: modular replacement, avoidance of special tools, and prevention of incorrect coupling during installation.
• Marking, documentation and provision of pump parameters to support system integration and purchaser detail specifications.

Typical use and users

Used by aircraft hydraulic system designers, pump manufacturers, aerospace OEMs, qualification and test engineers, procurement/specification authors, maintenance and overhaul organizations, and regulatory/airworthiness authorities. The standard provides a baseline for specifying pump performance and mechanical requirements so that manufacturers and purchasers can prepare or evaluate detail specifications for particular aircraft applications.

Related standards

Standards commonly referenced alongside ISO 8278:2016 include ISO 3601‑1 (seals — dimensions and tolerances), standards defining pressure classes and related hydraulic product requirements (referenced within ISO 8278), and earlier or withdrawn editions such as ISO 8278:1986. ISO/TC 20/SC 10 is the responsible technical committee for aerospace hydraulic equipment. Specific detail specifications for individual applications will normally reference additional test and material standards.

Keywords

hydraulic pump, pressure‑compensated pump, variable delivery, aerospace, aircraft hydraulics, case drain, shaft seal, overspeed, pressure pulsation, transient pressure, ISO 8278:2016.

FAQ

Q: What is this standard?

A: ISO 8278:2016 is an International Standard that sets general requirements for pressure‑compensated, variable‑delivery hydraulic pumps used in aircraft hydraulic systems; it establishes performance, construction and test requirements to be applied alongside application‑specific detail specifications.

Q: What does it cover?

A: It covers rated pressure classes, flow and transient performance, case and seal leakage limits, overspeed and torque requirements, port and case strength, fatigue/pressure‑impulse considerations, construction and sealing guidance, maintainability, marking and testing necessary to demonstrate compliance.

Q: Who typically uses it?

A: Aerospace OEMs and suppliers, pump designers and manufacturers, system integrators, test and qualification engineers, procurement/specification authors, and maintenance/overhaul organizations.

Q: Is it current or superseded?

A: ISO 8278:2016 is the second edition published in March 2016 and is listed as a published, confirmed International Standard (subject to periodic review). Previous editions (for example ISO 8278:1986) have been withdrawn. Users should check for any later revisions or confirmations from ISO before relying on the standard for new procurements.

Q: Is it part of a series?

A: It is part of ISO’s aerospace series and is intended to be used with application‑specific detail specifications; the document references related standards for seals and other components and falls under the work of ISO/TC 20/SC 10 (aerospace hydraulic equipment).

Q: What are the key keywords?

A: Hydraulic pump, pressure‑compensated, variable delivery, aerospace, aircraft hydraulics, case drain, shaft seal, overspeed, pressure pulsation, transient pressure.