UFC 3-240-13FN
25 May 2005
described in paragraph 6-3.1 will greatly reduce the chance of the operator getting
burned, and will allow a representative boiler water sample to be collected.
6-3.1
Boiler Water Sampling Cooler. A commercially available boiler water
sample cooler can be used when collecting a boiler water sample. If one is not
available, then a 4.6- to 6.1-meter long (15- to 20-foot) coil of copper or stainless steel
tubing (60 millimeters [0.25 inch]) may be used to cool the sample. The coil can be
immersed in a permanent cooling jacket as shown in Figure 6-2, or it may be immersed
in a bucket of cold water, if this does not interfere with operation of the system or create
a hazard. The flow of the boiler water sample through the coil must be slow enough so
that the cooled boiler water sample is no more than just warm to the hand
(approximately 38 C [100 oF]).
Figure 6-2. Boiler or Condensate Water Sample Cooling Coil
Cooled
Hot
Sample
Sample
Out
In
Cooling
Water
Outlet
Cooling
Water
Inlet
6-3.2
Boiler Water Sampling Procedures. The cooling water to the jacket
cooling coil is turned on before taking the boiler water sample and turned off after the
sample has been collected. The coil with boiler water is flushed with several times its
volume before collecting the sample to be tested. The cooled end of the boiler water
sample coil is then extended to the bottom of the sample bottle and at least 1 volume of
the bottle is allowed to overflow the container during the collection process. The sample
collection bottle can be plastic or glass. Glass bottles are not used if the boiler is silica
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