as shown in table 11-4, movement of pipe can be accounted for. In addition, piping should be supported at all changes in direction and load concentrations, such as heavy valves.
There are many other considerations in the layout of compressed air systems, which are beyond the scope of this manual. Refer to NAV-FAC DM 3-5, Compressed Air and Vacuum Systems, for further information.
After installation, the compressed air system must undergo testing. Generally, all piping and pressurized components should be tested at 150 percent of maximum working pressure. When testing, use clean, dry air or nitrogen. The system should be held at test pressure without loss for at least 4 hours.
s with any system, preventive maintenance conducted on a scheduled basis is an important factor in providing reliable service. Breakdown maintenance causes interruption in services that
Table 11-4. - Maximum Span for Pipe