Table 2-1.--Waste Heat Boiler Feedwater Requirements
Type of Water
Test Frequency
Constituent
Test
Maximum Limit
of Range
Distillate
Continuously
SI
0.065 epm
monitored
Chloride
CC
10 mho/cm
automatically
As required*
Chloride
CH
0.07 epm
Feedwater Tank
Daily on standby tank
Chloride
CH
0.10 epm
Hardness
CH
0.10 epm
Feedwater
Monitored
Conductivity
CC
8 mho/cm
SI
0.05 epm
As required*
Chloride
CH
0.05 epm
CH
0.02 epm
Condensate/Drains
Monitored
Chloride
CC
0.05 epm
Conductivity
SI
8 mho/cm
As required*
Chloride
CH
0.05 epm
CH
0.02 epm
Distiller Air
Monitored
CC
10 mho/cm
Ejector
SI
0.065 epm
Drains
As required*
Chloride
CH
0.05 epm
Deaerated Feedwater
Within 2 hours after
Oxygen
CH
5 ppb
light off and daily
thereafter
SI = Salinity Indicator
CH = Chemical Test
CC = Conductivity Indicator
* Sample and test as required for the daily indicator comparison test and to locate the source of contamination.
discussed the basic sampling locations and
At least once a month
frequencies, let's talk about the tests you will perform
on these samples.
Remember, these frequencies can change
according to circumstances and if any changes are
TESTING
made to the PMS. The location where you will
usually take these samples is the jacket water
As stated in the sampling section, water products
expansion tank. For additional information, you
rarely show visible signs of contamination. This is
should consult NSTM, chapter 233, "Diesel Engines."
why chemical testing of these products is so
important. All the test and treatment procedures we
WASTE HEAT SYSTEM.-- You must sample the
will discuss can be found in the PMS, the EOSS, or
waste heat system of an FFG-class ship according to
NSTM,
chapter
220,
volume
2,
"Boiler
the PMS. In addition, you must sample and test the
Water/Feedwater Test and Treatment," and chapter
waste heat water for nitrite levels daily whenever the
233, "Diesel Engines." In the following paragraphs,
waste heat system is used to operate the distilling
we will describe some of the testing procedures you
plant. You can obtain water samples from a
will use. We will discuss these
convenient location in the line upstream of the
supplemental electric heater. Now that we have
