ISO 6772:2012 PDF

Name: ISO 6772:2012 — Aerospace — Fluid systems — Impulse testing of hydraulic hose, tubing and fitting assemblies
SKU: ISO 6772:2012
Price: 25 EUR
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Aerospace — Fluid systems — Impulse testing of hydraulic hose, tubing and fitting assemblies

Название (английский):

ISO 6772:2012

Aerospace — Fluid systems — Impulse testing of hydraulic hose, tubing and fitting assemblies

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 6
Дата публикации:: 24 сентября 2012 г.
Издание:: ISO IS 6772 edition 3 version 1
ICS:: 49.080

Тип поставки:

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Язык документа:

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Срок поставки:1 раб. дн. (перевод)

Цена:90 €

Описание (английский):

This International Standard specifies the requirements and the procedures for impulse testing of hose, tubing, and fitting assemblies for use in aerospace hydraulic systems. Requirements may apply, when appropriate, to components used in other aerospace fluid systems.

Abstract

Overview

Key Topics

Impulse trace shape: Dynamic pressure/time traces observed on an oscilloscope must conform to the specified envelope (the shaded area in the standard) and permit assessment of rate-of-rise and peak characteristics.
Rate of pressure rise: Calculated from the times at 10 % and 90 % of peak pressure using the formula:

Rate of pressure rise = (0.9·p - 0.1·p) / (t_at_0.9p - t_at_0.1p)

where p is the peak pressure and t_at_0.9p / t_at_0.1p are the corresponding times.

Peak pressure and classes: Peak pressures and required minimum/maximum rates of rise are specified by pressure class and nominal diameter in Tables 1 and 2.
Specimen preparation: Test specimens must follow the component detailed design specification and receive applicable production treatments and production tests prior to impulse testing.
Test fluid: The test fluid shall be the specified aircraft system fluid or another hydraulic fluid compatible with the component under test.
Test method and duration: Typical cycle rate is (70 ± 5) cycles/min and, unless otherwise specified, the total number of cycles is 200 000. Oscilloscope sweep and data acquisition must record the impulse trace with accuracy traceable to international standards.
Temperature and soak: Temperature sequences and soak times are defined (see Table 3); a minimum 1 h soak is required after stabilizing at maximum or minimum temperatures before testing that portion of the sequence.

Applications

ISO 6772:2012 is used by:

Manufacturers for qualification testing of hydraulic hose assemblies, tubing and fittings.
Test laboratories validating component endurance against hydraulic impulse fatigue.
Procurement and design teams to specify standardised impulse-test requirements and acceptance criteria.

Benefits include improved reliability of fluid transmission elements, standardized test reporting, and evidence of fatigue resistance for certification and procurement.

Related Standards

ISO 6771 - Pressure and temperature classifications (referenced for pressure classes).
ISO 8575 - Hydraulic system tubing (referenced for nominal outside diameters).
ISO 8625-1 - Vocabulary for pressure-related terms (definition of peak pressure).
SAE AIR 1228 - Standard Impulse Machine Equipment and Operation (bibliographic reference).

For implementation, refer directly to ISO 6772:2012 for tables, figures and exact test envelopes and procurement-specific requirements.

Технические детали

Технический комитет: ISO/TC 20/SC 10 - Aerospace fluid systems and components
SKU: ISO 6772:2012

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