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QuickDraw
Storage and Semi-instantaneous
Boiler Water Heater
14
PV500-26 05/13
3. Tube bundle removal:
a. When practical and if the heat exchanger is connected to a collar assembly, leave tube bundle attached to
collar assembly and remove by unbolting collar assembly from tank.
b. During bundle removal, the dead weight of the bundle should never be supported on individual tubes or
contact any lined interior tank surface. Following removal, rest the bundle on the tube sheet, support plates,
or wood blocks cut to fit periphery of the bundle.
c. Tube bundles may be raised using slings formed by bending light sheet metal into a “U” form and attaching
lifting lugs to the ends of the sheets. Baffles can be easily bent and damaged if dragged over rough
surfaces.
d. Before reinserting the tube bundle into the unit place the ring/tank gasket over the end of the tube bundle
and bring forward to the backside of the tube sheet.
CAUTION:
When cleaning a tube bundle, tubes should not be hammered on with any metallic tool and, in case it is
necessary to use scrapers, care should be exercised that the scraper is not sharp enough to cut the metal of the
tubes.
4. The COLLAR assembly, if equipped, is connected to the tank nozzle flange using 9/16” grade 8 bolts. To
reinstall the collar assembly use a calibrated torque wrench and, in an alternating star pattern, tighten the bolts
in two increments: 95 ft-lbs and 145 ft-lbs (collar assembly threads and nut bearing surfaces must be clean, rust
free and NOT lubricated).
5. When replacing the heat exchanger HEAD, use a calibrated torque wrench to tighten the bolts/studs and
nuts in an alternating star pattern. Use the following chart as a guide. All heat exchanger head torque values
apply to well-lubricated nut bearing surfaces.