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STANAG 4110
STANAG 4110 pressure terms for cannons, mortars and ammunition
Designers, testers and procurement authorities who set and prove the pressure criteria for cannon and mortar barrels, projectiles and propelling charges.
STANAG 4110 is the NATO agreement that defines the pressure terms used to design and test cannons, mortars and their ammunition. NATO has not released it publicly; this page describes it from the Czech defence standard that implements it and from NATO publications that cite it.
- Edition
- 4
- Published
- 2005-11-30
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 4110 is the NATO Standardization Agreement defining pressure terms and their interrelationship for the design and proof of cannons or mortars and ammunition. Edition 4, promulgated in November 2005, is sponsored by CNAD, AC/225 NAAG, ICGIF. Its purpose is a single set of pressure definitions used the same way by every NATO nation that designs, tests or proves a gun or mortar system.
NATO has not released STANAG 4110 publicly. This page describes it from a public national implementation, the Czech defence standard ČOS 102501 (2nd edition, 2019), which states that it introduces STANAG 4110 edition 4 into Czech use, and from NATO ammunition-safety publications that cite the STANAG's definitions. A national implementation can add national requirements, so treat what follows as the Czech implementation's content except where a citing publication is named.
What the Czech implementation defines
ČOS 102501 sets out why a common set of terms matters: designing and testing guns, mortars and their ammunition requires a value for the gas pressure in the barrel, and NATO states need one set of definitions to avoid misinterpretation. It defines a gun or mortar as consisting of a barrel, a breech mechanism and auxiliary equipment, and a system as the combination of the gun or mortar, the projectile and the propelling charge; chamber pressure is the maximum combustion-gas pressure measured anywhere in the barrel.
For the barrel, it defines the Design Pressure (the chamber pressure not to be exceeded in more than one round in a million under limiting operating conditions), the Safe Maximum Pressure curve (exceeding it risks permanent deformation) and the safety margin between the two, the Permissible Maximum Pressure (not to be exceeded in more than 13 rounds in 10,000), and the Proof Pressure at which the barrel is tested within a tolerance band. It defines a matching set of terms for the projectile: Design, Safe Maximum, Permissible Maximum and Proof Pressure. For the propelling charge, the Extreme Maximum Operating Pressure is the Extreme Service Condition Pressure plus 4.75 standard deviations, and the Maximum Operating Pressure is the mean pressure plus 3 standard deviations achieved during barrel design, neither allowed to exceed the corresponding system-level pressure; the standard separately defines the propellant's upper and lower proof-test pressure limits, the mean chamber pressures a batch of propellant may produce at 21°C while still giving the specified projectile its specified muzzle velocity. At system level, the Design Pressure is whichever is lower of the barrel's Design Pressure and the projectile's Permissible Maximum Pressure, and the Permissible Maximum Pressure is whichever is lower of the barrel's and the projectile's own figures; the Extreme Service Condition Pressure is the chamber pressure reached firing the system under extreme operating conditions, calculated from firing-trial data by a statistical method the standard sets out in an annex, and a further annex gives a formula for the system's recoil impulse.
Where NATO publications cite it
Public NATO ammunition-safety publications describe what the STANAG does rather than reproduce it. AAS3P-20 states that "STANAG 4110 defines the pressure terms used for Cannon and outlines the methods employed in assessing those pressures", and that gun system wear or fatigue profiles and "the Cannon Safe Maximum Pressure Curve (STANAG 4110)" are used to determine where maximum pressure occurs and which gun tubes to test. AAS3P-10 states that "The guidance of STANAG 4110 should be considered early in the development of the weapon system", and its cross-reference table of national and NATO ammunition-safety documents lists STANAG 4110 as the one document that NATO, the United States, the United Kingdom, France and Germany all point to for the definition of pressure terms.
How we help
A supplier bound by STANAG 4110 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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