Technical Manual Page 15 CODEL
OPS.080 Issue : C Rev. : Date : 16/7/08 Doc. i/d : 0080/6 Ref. : 080040
Figure 11 : Typical Stub Pipe Arrangement for Concrete/Brick Stacks
4.3.3. Double Skin Stacks
Double skin stacks are often designed to allow movement between the inner and outer skins, to accommodate
thermal expansion or contraction when plant operation changes. This can cause unacceptable movement of
stub-pipes if mounting arrangements are not designed to maintain alignment. There are too many structural
variations to provide a single solution but, if in doubt, consult CODEL before commencing installation.
4.4. Installation of Purge Air Supply
The GCEM4000 requires air supplies for the pre-measurement zone and to purge the measurement cell for zero
verification. This supply should pass through a proprietary filter unit prior to entering the GCU for further
distribution.
4.5. Installation of Measurement Tube
Before proceeding, note that the probe is heavy (up to approx. 65kg) and is awkward to handle
particularly if access is limited. Ensure that necessary lifting equipment is available and that
precautions are taken to ensure the safety of all personnel whether involved with the
installation or working nearby.
Ease of installation will depend on site conditions. While CODEL or its agents are available to
provide advice on individual site situations, in the interests of safety, this manual does not give
specific installation instructions. Therefore it is important to consider the following:
a) Plan how the job is to be done and have all necessary lifting and safety equipment available.
b) Ensure that all personnel involved know the plan, are adequately protected and that there is no risk
to others working nearby.
c) If the plant is operational during this tube insertion procedure, remember that hot, dirty flue gases
can cause serious injury. All necessary protective clothing, including eye protection, should be worn.
d) Remember that as the tube is inserted further into the duct, the weight and moment exerted by the
tube within the duct will increase, whilst the available length of tube (outside the duct) with which to
control this will decrease.
e) Remember that, if the plant is operating, the tube will get hot with time. Take all necessary
precautions to deal with this.
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