TM 10-6640-238-13 5-42 5-20.    AIR/STEAM FLOW RATE INDICATOR METERS. This task consists of: a.   Remove b.   Install INITIAL SET-UP Tools Required General Mechanics Tool Kit, (Appendix B, Section III, Item 1) Materials/Parts Required Teflon Tape, (Appendix E, Section II, Item 157) Equipment Condition Steam Boiler Shut Down and appropriate Circuit Breaker Switch OFF. REMOVE Remove Air/Steam Flow Rate Indicator Meters.  See Figure 5-16. a. Disconnect union (1) from air flow rate indicator meter piping (2) and remove meter (3). b. Disconnect unions (4) from steam flow rate indicator meter piping (5) and remove meter (6). c. Remove piping (2 and 5) from meters (3 and 6). INSTALL Install Air/Steam Flow Rate Indicator Meters.  See Figure 5-16. a. Apply teflon tape to male fittings.  Be sure to wrap tape in same direction as pipe thread. b. Install piping (2 and 5) on meters (3 and 6). c. Position steam flow rate indicator meter (6) behind panel and connect union (4). d. Position air flow rate indicator meter (3) behind panel and connect union (1). e. Prepare and operate water system using internal water tank as source in accordance with procedures listed in paragraph 2-6j. f. Inspect for leaks and check for proper operation.