Controlled Distribution (Restricted to DoD and qualified defense contractors)

Equipment tested for submarines (SSN/SSBN) requires a note that the vibration test is performed at ambient humidity, but the equipment must be designed for 100% condensation. The PDF does not cover this—it is in a complementary NAVSEA instruction.

| Option | Document | Focus | Availability | | :--- | :--- | :--- | :--- | | | MIL-STD-167-1(A) | Environmental & Internally-Excited Vibrations (Types I & II) | Freely Available | | 2 | MIL-STD-167-2(A) | Propulsion System & Reciprocating Machinery Vibrations (Types III, IV & V) | Restricted / Classified |

Because MIL-STD-167-2A covers critical propulsion systems, it is classified under . This means public access may be restricted depending on the specific agency or defense contract context. To source it legally and securely:

In conclusion, MIL-STD-167-2A is a critical standard that plays a vital role in ensuring the reliability and effectiveness of naval vessels. By setting out requirements and specifications for the design, testing, and installation of shipboard machinery and equipment, the standard helps to minimize vibration and noise, which is essential for ensuring system performance, enhancing stealth, and protecting personnel. As naval vessels continue to play a critical role in national defense and security, the importance of MIL-STD-167-2A will only continue to grow.

Understanding MIL-STD-167-2A: The Standard for Mechanical Vibrations of Shipboard Equipment

This type focuses on vibrations imposed on equipment from the ship’s operating environment. This traditionally includes the low-frequency vibrations found on shaft-propeller driven naval vessels. These vibrations originate from the ship’s propulsion system, wave action, and adjacent machinery.

The equipment is outfitted with sensors and monitored during actual operation or simulated stress environments to verify that the mathematical models match real-world performance. Where to Find an Official MIL-STD-167-2A PDF

Place control accelerometers on the mounting points. Place response accelerometers on heavy internal components (transformers, contactors, PCBs).

MIL-STD-167-2A applies to all equipment installed on U.S. Navy ships that falls under the category of reciprocating machinery or components directly tied to the main propulsion line. This includes:

MIL-STD-167-2A is a United States military standard that establishes the requirements for the mechanical vibrations of naval shipboard equipment. Specifically, Revision A (dated May 21, 1992) focuses on reciprocating machinery , propulsion systems, and shafting. Key Overview of MIL-STD-167-2A MIL-STD-167-1A

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Maintain meticulous records of testing, including resonance dwells and functional tests.