envea STACK 602, User Manual

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9 Maintenance STACK 602
28
(PC-000848-MA Issue 5, December 2021)
ENVEA UK Ltd
5.2.3 Fitting the Stack Mounting Stubs
NOTE
: Ensure adequate access is provided by ladder or staging to both the Transmitter and
Receiver units, and sampling ports.
When the stubs' optimum position has been decided, the stubs should be welded
into position onto the stack. The objective in mounting the stubs is to optimise
their alignment such that they are directly opposite each other.
Figure 11: Fitting the stack mounting stubs.
1. Referring to
Figure 11
, cut a Ø 45 mm (1½ ” ) hole in one side of the
stack/duct.
2. Measure or calculate the position for a hole directly opposite the first and cut
a second Ø 45 mm opening.
3. If required, fit the stack mounting stubs as follows:
3a. For smaller stacks (up to Ø 2½ m) and provided there is sufficient
clearance at the mounting location, the most convenient method for
aligning the stack mounting stubs is to source a rigid alignment tube or
rod with a Ø 45 mm OD and pass this from one side of the stack through
to the other.
The mounting stubs can then be simply slipped over the alignment tube
or rod and tack welded in place.
3b. For larger stacks, alignment will need to be performed by eye.
4. When the alignment is satisfactory, remove the alignment tube/rod (where
used) and finish off by securely welding both mounting stubs in place.