Meriam 70H_72H High Pressure Wet Tap Accutubes with Integral 3-Valve Head and Optional RTD - Manual (Page 14)

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4.5.9 Lightly wrench-tighten the nut in place. Double check that all connections are
tight and the insertion valve is fully open.
4.5.10 Mount the drill motor onto the drill and penetrate the pipe. The mounting
assembly is now pressurized.
4.5.11 Retract the drill bit until it stops against the packing gland fitting and
disassemble the drill motor from the drill bit.
4.5.12 Close the valve.
4.5.13 Slowly loosen the packing gland fitting to vent any pressure. Remove drill bit.
4.5.14 Assemble the reducing bushing (on 3/4” probe only) and cage pipe onto the
insertion valve.
4.5.15 Assemble the pipe coupling onto the end of the cage pipe.
4.5.16 Assemble the packing gland fitting onto the pipe coupling. Be sure that the
ferrule is in place with the taper end into the body of the fitting and the nut loose
on the fitting body. All other joints should be wrench-tight.
4.5.17 Insert the Accutube probe into the packing gland fitting and slide down until the
tip meets the insertion valve.
4.5.18 Lightly wrench-tighten the compression nut onto the Accutube probe.
4.5.19 Attach the safety chain to the head of the Accutube probe and to the chain hook
located on the bottom side of the insertion valve. There should be little slack in
the chain. This chain is an imperative safety measure to prevent the Accutube
probe from accidentally being forced out of the assembly under pressure.
4.5.20 Verify that both instrument valves are fully closed.
4.5.21 Open the insertion valve fully. The entire system is again pressurized including
the Accutube probe. Any leakage at the compression gland fitting can be
corrected by further tightening the packing gland nut.
4.5.22 Manually push the probe in through the mounting assembly until the tip touches
the opposite wall of the pipe.
4.5.23 Retract the probe 1/16” on line sizes 12” and less, and 1/8” for larger line sizes.
This measure properly locates the sensing port holes and allows for thermal
expansion of the probe. Align the probe so that the side head connection points
into the flow.
4.5.24 Tighten the nut on the packing gland fitting two turns from the hand-tight/light
wrench position for final sealing/holding capability.
DO NOT OVER TIGHTEN! PROBE DAMAGE CAN RESULT FROM
OVERTIGHTENING.
4.5.25 Readjust the chain position so that the chain is taut in this fully inserted position.