MIL-STD-1330D(SH)
w/ Change 1
4.5.2 Other final cleaners. No aqueous cleaning solutions other than TSP solutions, or MIL-DTL-24800 compositions shall be used as a final cleaner. Other than the NAVSEA approved halogenated solvents, approval shall be obtained prior to using any other cleaning solvent as a final cleaner (see 6.3). Activities interested in obtaining approval of other final cleaning solvents or processes shall obtain direction (see 6.3).
4.6 Incompressible test fluids.
4.6.1 Safety precautions. An incompressible fluid, either water or NAVSEA approved halogenated solvent, shall be used to hydrostatically test systems or components. Incompressible test fluids shall be used at room temperature. Over- pressure protection shall be used when testing with an incompressible fluid. Incompressible fluids can easily generate very high pressures if heated and not vented. Any use of a NAVSEA approved halogenated solvent shall be as specified in 4.4. Unless otherwise specified, testing with incompressible fluids shall be in accordance with NAVSEA S9086-RK-STM-010/CH-505.
4.6.2 Water. Grade B water shall be the preferred hydrostatic test fluid for any system or component that can be cleaned with an aqueous cleaning solution. For oxygen clean systems or components, Grade B water filtered to
10 micrometers nominal, or finer, shall be used to prevent contamination. Grade A water filtered to 10 micrometers nominal, or finer, shall be used to tightness test the demineralized water system.
4.6.3 Cleaning solvent. A NAVSEA approved halogenated solvent shall be the preferred hydrostatic test fluid for any system or component that is final cleaned with a cleaning solvent. For oxygen clean systems or components, a NAVSEA approved halogenated solvent filtered to 10 micrometers nominal, or finer, and having a hydrocarbon or NVR level less than 5 ppm, determined as specified in 5.13.2, shall be used to prevent contamination.
4.7 Compressible test fluids.
4.7.1 Safety precautions. Inert gases, such as argon, helium, and nitrogen although not toxic, will not support human respiration and can cause asphyxiation. Accumulation of these gases in small or closed spaces can reduce the oxygen concentration below the normal level of 20 to 22 percent. Ensure adequate ventilation is provided to
maintain the oxygen levels within normal levels. If doubt exists, an oxygen monitor with alarm set at 19.5 percent shall be used to monitor the area (see 6.4). Any use of oxygen shall be as specified in 4.1. Unless otherwise specified, testing with a gas shall be in accordance with NAVSEA S9086-RK-STM-010/CH-505.
4.7.2 Helium. Helium shall be the preferred test gas for helium and helium-oxygen components and systems when performing tightness tests. Helium or nitrogen are the preferred purge gases for all applications. Helium shall be in accordance with MIL-PRF-27407, Type I, Grade B. Helium shall be filtered to 10 micrometers nominal or less. Helium may be used in place of nitrogen for tightness testing with local engineering approval. However, note that helium may leak past mechanical joints or seats so that systems that are tight with nitrogen may demonstrate leakage when tested with helium. If residual helium in a system will present a problem, it shall be purged with the appropriate gas as required.
4.7.3 Nitrogen. Nitrogen shall be the preferred drying gas for all applications and test gas for hydrogen, oxygen, and nitrogen systems and components when performing tightness tests. Nitrogen or helium are the preferred purge gases for all applications. Nitrogen shall meet, by vendor or laboratory statement of conformance, the requirements of A-A-59155, Grade A or B, or MIL-PRF-27401, Type I, Grade B or C, or CGA G-10.1, Grade L or M. Nitrogen shall be filtered to 10 micrometers nominal or less. If residual nitrogen in a system will present a problem, it shall be purged with the appropriate gas as required.
4.7.4 Oxygen. Oxygen shall only be used in a system or component specifically designed and cleaned for oxygen service. When effected joints can be continuously monitored for leakage, oxygen may be used for tightness testing with local engineering approval. No other use of oxygen for tightness testing shall be permitted.
4.7.5 Argon. When argon is specified to support welding, it is an acceptable purge gas. Argon shall meet, by vendor or laboratory statement of conformance, the requirements of MIL-PRF-27415, Type I, Grade A. Argon shall be filtered to 10 micrometers nominal or less. If residual argon in a system will present a problem, it shall be purged with the appropriate gas as required.
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