MIL-STD-2193 Ship Hydraulic System ComponentsThis standard provides design, construction, and testing requirements that are common to most components used in ship hydraulic power transmission and control systems. This standard does not establish configuration requirements, pressure, flow, or performance requirements for any specific component.

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MIL-STD-2193C(SH)

5.3.2 Inspection routine. The component specification shall identify the required inspections and tests using the guidance herein for their selection. Unless otherwise specified in the applicable component specifications, a single sample unit shall be subjected to the inspection and tests specified in table VI. Conformance tests and requirements shall be as specified in the component specification.

TABLE VI. Inspections sequence.

Tests	Test paragraph
Salt fog	5.3.3.2
Proof pressure	5.3.3.3
External leakage	5.3.3.5.1
Internal leakage	5.3.3.5.2
Extreme temperature	5.3.4
Shock	5.3.11
Vibration	5.3.8
Endurance	5.3.5
Reliability	5.3.9
Maintainability	5.3.10
Contamination sensitivity	5.3.12
Fatigue	5.3.6
Noise	5.3.7
Burst pressure	5.3.3.4

5.3.3 Test methods.

5.3.3.1 Operation. Each component shall be subjected to at least 10 normal operating cycles at the rated pressure specified in the applicable component specification without any sign of external leakage or other malfunction.

5.3.3.2 Salt fog. Unless otherwise specified in the component specification, the components shall be subjected to the salt fog test procedures specified in MIL-STD-810, Method 509.5 for 48 hours. After completion of testing and cleaning, the base metal of the component shall not be visible through the coating or finish, nor shall there be any evidence of blistering, softening, separation from the base metal corrosion products, or other coating failures. When more than one design is developed by the same contractor who uses the same method of surface preservation for all designs, only one representative unit shall require this test, provided the same materials are used. Unless otherwise specified in the component specification, test data on similar equipment with the same base and coating materials and equivalent coating thickness may be used to meet this requirement.

5.3.3.3 Proof pressure. Unless otherwise specified in the applicable component specification, a proof pressure of 150 percent of the system-rated operating pressure shall be applied to the components. The rated operating pressure of a component is the maximum safe operating or working pressure based on an established number of fatigue cycles, and does not preclude use in applications subject to infrequent higher transient pressures. For parts not covered by a specification or standard, the contracting activity shall specify the required proof pressure. For unbalanced cylinders and other components subjected to pressure multiplication, the proof pressure for ports subjected to pressure multiplication shall not be less than the nominal system pressure times the multiplication factor based on area ratios. The following additional guidance shall be used in determining the minimum proof pressure:

a. Suction ports. At least 135 percent of the maximum suction pressure, but not less than 2 bars (29 lb/in2). b. Pressure and cylinder ports. The proof pressure shall not be less than the maximum calculated pressure

developed under conditions of hydraulic shock considering, but not necessarily limited to, such factors as rapid valve closing, overhauling and suddenly applied loads, and relief valve full flow settings and response time.