collecting tank if other water, such as makeup, is
received in the tank.
The equipment required for this test is as follows:
One 100-ml beaker, marked at 50 ml
One 1-oz indicator bottle, with dropper marked
at 0.5 ml
One 4-oz brown bottle of condensate pH
One 9-in. stirring rod, glass
In making a test for pH of treated condensate,
proceed as follows:
1. Pour a freshly drawn sample into the testing
beaker until it is filled to the 50-ml mark. You do not
have to cool the sample.
2. Transfer 0.5 ml of indicator solution to the
50-ml testing beaker, using the marked dropper. Stir the
solution in the beaker. If the color of the solution
changes to light pink. the sample is NEUTRAL, or
slightly alkaline; therefore, the condensate pH is
satisfactory and the test is over.
3. Record in a log that the pH range is between 7
4. When the color change is green, the sample is in
the acid range and the boiler water must be treated with
Amines. Treat the boiler water with Amines gradually
(in small amounts at a time), and retest after each
treatment. Amines are the only chemicals used to treat
boiler water that will vaporize and leave with the steam
and thereby protect the return system.
Permission to treat with Amines must be
obtained from your supervisor. Amines
are volatile, poisonous, and in the
6. When the color change is red or purple, the
sample is in an excessive alkaline (pH) range. In that
case, reduce the Amines treatment gradually (in small
amounts at a single time), and retest after each
treatment. Remember, the condensate pH normal
acceptable range is between 7 and 7.5.
Test for Total Dissolved Solids
The solu-bridge method is a simple and rapid way
to determine the total dissolved solids (TDS) content.
Ionizable solids in water make the solution conduct
electricity. The higher the concentration of ionizable
salts, the greater the conductance of the sample. Pure
water, free from ionizable solids, has low conductance
and thus high resistance. The solu-bridge instrument
measures the total ionic concentration of a water sample,
the value of which is then converted to parts per
million. The solu-bridge test equipment and reagent are
furnished by the supplier in a kit.
The model of the solu-bridge given below
is not suitable for measuring solids in
condensed steam samples or an effluent of
the demineralizing process. A low-
conductivity meter is necessary. because
of the extremely low solids content of
condensed steam and demineralized water.
The equipment and reagent are as follows:
One solu-bridge, Model RD-P4 or equivalent, for a
105 to 120-volt, 50- to 60-cycle ac outlet. (This
model has a range of 500 to 7,000 micromhos/cm.)
One polystyrene dip cell, Model CEL-S2.
One thermometer, 0°F to 200°F.
One 0.1-g dipper for gallic acid.
One cylinder, marked at the 50-ml level.
Gallic acid powder, 1 lb.
Calibration test solution. I qt.
The test is made as follows:
Without shaking, pour 50 ml of the sample into the
cylinder. Add 2 dippers of gallic acid powder and mix
thoroughly with a stirring rod.
2. Connect the dip-cell leads to the terminals of the
solu-bridge and plug the line cord into a 110-volt ac outlet.
Turn the switch ON. and allow the instrument to warm up
for 1 minute.
3. Clean the cell by moving it up and down several
times in distilled water. Measure the temperature of the
sample to be tested; then set the point of the solu-bridge
temperature dial to correspond to the thermometer
4. Place the cell in the cylinder containing the 50-ml
sample. Move the cell up and down several times under
the surface to remove air bubbles inside the cell shield.
Immerse the cell until the air vents on the cell shield are