Developing helium and vacuum test programmes

LEAKLAB · TESTING AND ENGINEERING

An object-specific programme connects the customer’s requirement with a measurable result and a defined acceptance decision.

From the drawing to the measurement sequence

LeakLab develops leak-test programmes for new products, prototypes, custom chambers, large systems and assemblies with difficult access or multiple cavities. Long connection lines and complex geometry make system-response verification particularly important.

The scope can cover local helium spraying, integral chamber testing, sniffing or pressure-change measurements. The programme defines test boundaries, allowable loads, fixtures, tracer gas, reference-leak connection, rig leak checks, scan route, response time, preparation and the sequence of operations.

Measurement validity and acceptance

The required sensitivity must be demonstrated by the connected arrangement. If the acceptance limit is stated for a different gas, the conversion needs a separate physical justification. Quantitative work includes uncertainty and an agreed decision rule.

The programme can draw on GOST 24054-80, GOST 28517-90, GOST R 53177-2008 or other applicable documents, with scope and editions identified for the project.

Preparing and verifying the test

1. Review the drawing, materials, internal volumes, test boundary and required result.
2. Agree the document edition, allowable pressure difference, vacuum and temperature, acceptance criterion and required system sensitivity.
3. Clean and dry the object, prepare fixtures and exclude leakage from the test connections.
4. Check instrument metrological status and the working characteristics of the complete arrangement; use an appropriate reference response for the selected method.
5. Perform the agreed scan or measurement cycle and record the actual conditions. Confirm suspected leaks by repeat tracer-gas exposure where applicable.
6. Check system stability after the test and report the result against the agreed criterion.

What the customer receives

The agreed scope can include a test programme, operating or inspection instructions, measured results, a map of located leaks and a technical conclusion. The report identifies the object and tested regions, applicable programme, instruments and metrological status, pressure and temperature, response checks, observations and limitations.

Define your task

Send a drawing or sketch, material, dimensions and volume, working pressure, allowable vacuum and temperature, leak-tightness requirement, number of items, site and schedule. These inputs determine the method, fixture, equipment and reporting scope.