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1. Loosen all outermost nuts on tension studs.
2. Tighten the inside jacking nuts on the tension
studs forcing the two conical sections apart. When
the two flange faces have separated, remove the
tension studs that do not have inside jacking nuts,
so that the element assembly can be removed.
The inside jacking nuts are installed on all tension
studs that facilitate jacking the unit apart. The
inside jacking nuts are not installed on tension
studs that are taken out, for ease of removal.
3. Thoroughly clean the gasket sealing faces being
careful not to damage the sealing surface. For
reassembly, lightly grease one side of a new
gasket and place it in the machined recess of each
interior flange on the two conical sections.
4. Replace the flame element assembly with a new
assembly or properly cleaned and inspected
existing unit.
5. Loosen the jacking nuts on the tension rods until
the flame cell assembly seats onto the gaskets.
6. Replace all tensioning studs and tighten the outer
nuts hand tight only. Check to be sure that all the
jacking nuts are completely loose and not making
contact with the flange face.
7. Torque the bolts in sequence as shown in the
Torquing Instruction section.
Torquing instructions
CAUTiOn
Excessive or uneven torque can
cause permanent damage to gaskets
and housing.
Tools/Supplies Required
• Hand operated conventional torque wrench or
power assisted torque wrench appropriate for the
specified torque.
• Socket wrenches of the proper size to fit the hex
nuts being tightened.
• Molydisulfide based lubricating paste. Molykote
or equivalent.
• Brush suitable for applying lubricant to the studs.
• Wiping rags necessary for the clean up of
excessive lubricant.
Molykote
G-n is a mark owned by Dow Corning Corporation.
®
Procedure
1. Use studs and nuts that are free of visible
contamination and corrosion.
2. Apply lubricant to the threads of the stud protruding
outboard of the interior flanges and to the face of
the hex nuts which will contact the flange.
3. Assemble the nuts to the studs such that the
amount of thread extending outboard beyond the
nut is approximately equal on both ends.
4. Tighten the nuts to the torque values shown
in Table 4 following the designated sequence,
repeating the sequence as shown. Flange pattern
tightening sequences are shown in Figure 5.
Bolt Lubrication
Lubrication affects required torque of clean fasteners
in good condition more than any other factor. In fact,
90% of applied torque goes to overcome friction while
only 10% actually stretches the bolt. Table 4 assumes
that only machine oil is used as a lubricant. Table 5
shows a list of several common lubricants and their
effect on torque required to stretch bolts to 50% of
their yield strength. Most are available from local
bearing distributors.
recommended Spare Parts
For installations that require frequent maintenance
and minimum downtime, it is recommended that the
user purchase a spare element assembly and several
spare element gaskets. The spare element assembly
can be installed immediately and the dirty assembly
can then be cleaned and stored as a spare for the next
maintenance interval.
Element gaskets must be replaced each
time the cell assembly is loosened and
removed to ensure a gas tight seal.
Parts Ordering
G-n
®
When corresponding with your local Sales Office about
this equipment, always reference the equipment serial
number stamped on the nameplate.
Enardo DFA Series
note
11
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