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STANAG 4113
STANAG 4113 pressure measurement by crusher gauges
Makers of crusher-type pressure gauges and calibrated pressure transducers used to test gun and mortar chamber pressure, and the defence procurement authorities that submit them for NATO approval.
STANAG 4113 sets NATO's standardised procedures for crusher-type gauges and piezoelectric transducers that measure peak chamber pressure in guns and mortars. NATO has not released it publicly; this page describes it from the Czech defence standard that implements it.
- Edition
- 3
- Published
- 1993-06-04
NATO has not released this STANAG publicly. It is NATO UNCLASSIFIED, and organisations that need it obtain it through their national standardization authority.
What it is
STANAG 4113 is the NATO Standardization Agreement on pressure measurement by crusher gauges. Edition 3, promulgated on 4 June 1993 under NATO's CNAD, AC/225 NAAG, ICGIF committees, it covers the publication AEP-23, Pressure Measurement by Crusher Gauges - NATO Approved Tests for Crusher Gauges. Its purpose is standardised procedures for crusher-type pressure gauges, the devices used to measure peak pressure in gun and mortar chambers, so that results are comparable between NATO nations and the data each nation submits internationally carries more value.
NATO has not released STANAG 4113 or AEP-23 publicly. This page describes them from a public national implementation, the Czech defence standard ČOS 102505 (edition 2, Prague 2022), which states that it introduces STANAG 4113 edition 3 and AEP-23 edition 2 into Czech use. A national implementation can add national requirements and reservations, so treat what follows as the Czech implementation's content, not as NATO's own text.
How the gauge works and what NATO approval requires
ČOS 102505 explains that a crusher gauge is a mounting assembly, typically a body, a crusher piece and pressure and centring parts, inserted into the chamber. When the weapon fires, the changing gas pressure deforms the crusher, usually a ball or cylinder; after firing the crusher is removed and its residual length is measured, and the pressure is read from a mastercurve for the temperature at which it was fired. Crusher gauges are used as an alternative to electrical transducers because they do not require the barrel to be drilled.
To appear on NATO's approved list, a gauge must be submitted with its country of origin, its designation and approval date in that country, a technical description, and a full set of production and assembly drawings meeting applicable international standards. Manufacture follows ČOS 051625, and every gauge must carry critical measurements, piston diameter, piston-guide diameter, the parallelism of the piston and anvil faces, and its rated pressure and temperature range, together with a declaration of conformity and an instrument logbook kept until the gauge is retired. The crushers themselves must meet material-purity and dimensional tolerances and, where a heat-treated material is prescribed, a controlled heat-treatment process, all checked against the manufacturer's quality system.
Submission, working range and calibration
A state submitting a crusher gauge or crusher for NATO approval gives the working group AC/225-LCG/3 its production drawings, a technical description of every part, and existing firing-test data. Comparative approval trials run at five-year intervals, and firing trials are not held twice in succession in the same state. The standard's working range spans 50 MPa to 850 MPa across -40°C to +60°C; where more than one gauge type is needed to cover it, adjacent measuring ranges must overlap by at least 60 MPa.
As an alternative to crusher gauges, ČOS 102505 also sets out calibration of piezoelectric pressure transducers, referenced against a Kistler 6213B sensor fitted with a defined thermal-protection disc and adapter. A transducer is approved for use if it stays within 1 percent average deviation and plus or minus 2 percent reproducibility of the reference sensor, and it must be withdrawn from use once its sensitivity drifts by 2 percent from its previous measurement or 4 percent from its measurement at the start of use.
How we help
A supplier bound by STANAG 4113 through a contract holds the obtained text through its national authority. In ComplyTrain you record the requirements that apply to you as your own requirements, give each an owner, and keep the evidence that shows you meet them against each one.
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