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 values shown in Table 6 following the
designated sequence, repeating the sequence as shown.
Flange pattern tightening sequences are shown in Figure 5.
Bolt Lubrication
Enardo provides low friction polymer coatings on carbon steel
fasteners. No additional lubrication should be required. When
stainless steel fasteners are provided, lubrication is recommended
to reduce tightening torque and to prevent potential galling.
Lubrication will affect 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 6 assumes that only machine oil is used as a lubricant. Table 7
lists 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 be stored as a spare for the next
maintenance interval.
Note
Element gaskets should be replaced each time the
cell assembly is loosened and removed to insure a
gas tight seal.
Parts Ordering
When corresponding with your local Sales Office about this
equipment, always reference the equipment serial number stamped
on the nameplate.
When ordering replacement parts, specify the complete 7-character
part number of each required part as found in the following parts list.
DESCRIPTION
COEFFICIENT OF FRICTION
MULTIPLY TORQUE VALUE IN TABLE 6 BY
Machine Oil
f = 0.15
1.00
API SA2 Grease
f = 0.12
0.80
Never-Seez
®
(Ni base)
f = 0.11
0.73
Never-Seez
®
(Cu base)
f = 0.10
0.67
Molykote
®
G-n Paste
f = 0.06
0.40
Table 7.
Torque
Correction Factors for Common Lubricants
CAUTION
Some element assemblies are heavy and will
require the use of adequate equipment and
manpower to prevent injury.
Element Re-assembly
1. Thoroughly clean the gasket sealing faces being careful not to
damage the sealing surface. Lightly grease one side of a new
gasket and place it in the machined recess of the interior flange
on the conical sections and in the upper flange.
2. Replace the flame element assembly with a new assembly or
properly cleaned and inspected existing unit.
3. Re-assemble in the reverse order of disassembly.
4. Tighten the tensioning studs as detailed below:
CAUTION
Excessive or uneven torquing can cause
permanent damage to gaskets and housing.
Tools/Supplies Required:
•
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
®
G-n
or equivalent.
•
Brush suitable for applying lubricant to the studs.
•
Wiping rags necessary for the clean-up of excessive lubricant.
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.
Never-Seez
®
is a mark owned by Bostik, Inc.
Molykote
®
G-n is a mark owned by Dow Corning Corporation.
7
Free Vent Flame Arrestor
North America
Only
