Leak testing under GOST, OST, ISO and ASTM

LEAKLAB · TESTING AND ENGINEERING

Select the test by object, method and applicable technical document, then define acceptance and verification conditions.

Choose a method before selecting a document

Local helium spray and sniffer techniques locate defects. Chamber and hood arrangements assess the total leakage of an object or a defined region. Pressure-change methods evaluate a bounded volume with appropriate temperature and deformation assessment. These methods answer different questions and have different restrictions.

Technical frameworks

The Russian service portfolio covers GOST 24054-80, GOST 28517-90, GOST R 53177-2008 and industry-specific OST documents. International projects may use ISO 20485 and the appropriate ASTM tracer-gas method. Valve-seat leakage, packaging tests, nuclear-industry components and vacuum shells require their own applicable product requirements.

A standard title alone does not set the pressure, tracer concentration, permissible leak rate or document package for every product. The contract and programme identify the relevant edition and scope.

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.