Resources
ISO 19879
ISO 19879 is where the test methods for metallic tube connections are written down, so a result reported against it is comparable with one from any other accredited laboratory. Clause 13 is the one worth knowing about: it applies impulse and vibration together rather than in sequence, which is the combination that actually loosens a connection in service, and the one a specification names when the application is rolling stock or a reciprocating skid.
Accredited clauses
| Clause | Test | Notes |
|---|---|---|
| 6 | Leakage | The tightness check the rest of the suite is measured against. |
| 7 | Proof pressure | Pressure held above the working rating without permanent deformation or leak. |
| 8 | Burst pressure | Raised to failure, establishing the true margin. |
| 9 | Cyclic endurance | Repeated pressure cycling, run to the standard's cycle count rather than to a house figure. |
| 10 | Vacuum | Held under vacuum, where the load on a seal reverses and a joint tight under pressure can still draw in. |
| 13 | Cyclic endurance (impulse) with vibration | Impulse and vibration together. The clause that separates a connection qualified for a bogie from one qualified for a bench. |
What we can show
Accredited scope, certificate TC-16263
All six clauses listed by number on the NABL scope annexure.
Type-test certificates
Published certificates cover ISO 19879 alongside BS EN 61373, IEC 60068 and IACS P2.2-12 for single-ferrule fittings.
Products qualified to ISO 19879
No catalogue model lists ISO 19879 among its approvals yet. The certificates that cite it are in the certificates library.