ISO 7661:1984

Name: ISO 7661:1984 — Aerospace — Fluid systems — Clamp blocks for tube lines having axial alignment — Design standard and qualification testing — Metric series
SKU: ISO 7661:1984
Price: 25 EUR
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Aerospace — Fluid systems — Clamp blocks for tube lines having axial alignment — Design standard and qualification testing — Metric series

Название (английский):

ISO 7661:1984

Aerospace — Fluid systems — Clamp blocks for tube lines having axial alignment — Design standard and qualification testing — Metric series

Статус документа:: Отменён
Формат:: Электронный (PDF)
Количество страниц:: 8
Дата публикации:: 1 декабря 1984 г.
Издание:: ISO IS 7661 edition 1 version 1
ICS:: 49.080

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Цена:25 €

Описание (английский):

Gives definitions for these clamps with or without electrical grounding, designed for a range of tube outside diameters from 4 to 32 mm selected from ISO 2964, and lays down the dimensions of clamp blocks and specifies the test methods for qualification testing. Furthermore gives classification and temperature conditions.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 7661:1984 - Aerospace - Fluid systems - Clamp blocks for tube lines having axial alignment - Design standard and qualification testing (Metric series) defines design, dimensions and qualification tests for clamp blocks used to fasten tubing in aerospace fluid systems. It covers clamp blocks with or without electrical grounding, for tube outside diameters selected from ISO 2964 (metric series, nominal range 4–32 mm), and specifies classification, dimensional limits and test methods for mechanical, electrical, climatic and flame-resistance qualification.

Key topics and technical requirements

Scope & classification

Clamp blocks are classified into Class A, B and C by tube diameter ranges and maximum heights (examples from the standard: Class A H = 27 mm, Class B H = 35 mm, Class C H = 48.5 mm).
Supports axial alignment (tube axes in same plane) and include monobloc and modular designs with removable parts and optional inserts.

Dimensional data

Maximum heights, nominal radii and removable-part widths are tabulated per tube outside diameter (metric sizes).
Modular bolt spacing equals the sum of removable-part and insert widths plus 10 mm; monobloc spacing equals the corresponding modular spacing.

Temperature classes

Designed per temperature classes in ISO 6771 (standard includes a Type III case up to +200 °C). Specific service ranges are referenced to ISO 6771.

Electrical requirements

For grounded clamp blocks, electrical contact resistance is measured before and after mechanical and climatic tests; acceptance ≤ 150 mΩ.

Mechanical qualification

Sliding tests (e.g., 6 mm displacement at 1 Hz, typical test temperatures +55 °C, +110 °C, +160 °C), contamination/fluids exposure (fuel, hydraulic fluids, de-icing, cleaning fluids, fire-extinguishing liquids), vibration and wear checks.
Initial sliding force targets (example): 15–30 N depending on tube/material; post-test minimum sliding force > 5 N.
Wear limits are defined (examples: maximum local wear allowances and percentage of tube thickness limits for light alloys vs stainless/titanium).
Fastening screw tightening torque cited as 2 N·m for sliding tests.

Climatic & corrosion tests

Low/high temperature, salt spray and other climatic procedures are specified in accordance with ISO 7137.

Flame resistance

Small-scale flame test using Bunsen burner (flame temperature ~843 °C, 12 s exposure) with acceptance criteria for continued burning, flaming drops and ignition of a cotton indicator.

Applications and users

ISO 7661 is intended for:

Aerospace designers and engineers specifying tubing supports in hydraulic, fuel and pneumatic systems.

Manufacturers of clamp blocks and tube supports who need standardized dimensions and qualification protocols.

Procurement and maintenance teams requiring verified, qualified clamp hardware for aircraft and spacecraft fluid systems.

Test laboratories performing mechanical, electrical, climatic and flame-resistance qualification on aerospace components.

Related standards

ISO 2964 - Aircraft tubing outside diameters and thicknesses (metric)

ISO 5855 - Aerospace construction - MJ threads

ISO 6771 - Pressure and temperature classifications for fluid systems/components

ISO 7137 - Environmental conditions and test procedures for airborne equipment

ISO/TR 2695 - Resistance to fire in designated fire zones

Keywords: ISO 7661, clamp blocks, aerospace fluid systems, tube lines axial alignment, qualification testing, metric series, tube diameters 4–32 mm, electrical grounding, sliding test, flame resistance.

ISO 7661:1984

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

ISO 2964:1985

Aerospace — Tubing — Outside diameters and thicknesses — Metric dimensions

ISO 6771:2007

Aerospace — Fluid systems and components — Pressure and temperature classifications

ISO 7137:1995

Aircraft — Environmental conditions and test procedures for airborne equipment

ISO 766:1972

Fibre building boards — Determination of dimensions of test pieces

ISO 5855-3:1999

Aerospace — MJ threads — Part 3: Limit dimensions for fittings for fluid systems