Судовые котельные установки - 27 стр.

    A representative water sample is required. Always take water sample
from the same place. Allow water to flow from the sample cook before
taking the sample for testing, to ensure the line is clear of sediment.
    TESTING
    P. ALKALINITY TEST
    1. Take a 200 ml water sample in the stoppered bottle provided.
    2. Add one P.Alkalinity tablet and shake to desintegrate. If
P. Alkalinity is present the sample will turn blue.
    3. Repeat tablet addition until the blue colour changes to permanent yel-
low.
    CALCULATION
    P. Alkalinity ppm (CaCO3) = (Number of tablets used·20) – 10.
    For example:
    If 8 tablets are used then P. Alkalinity = (8·20) – 10 =150 ppm.
    4. Mark the result obtained on the log sheet provided, against the date
on which the test was taken.
    CHLORIDE TEST
    1. For boiler under 30 bar take a 50 ml sample in the stoppered bottle
provided.
    2. Add one chloride tablet and shake to desintegrate, sample should turn
yellow if chlorides are present.
    3. Repeat tablet addition until the yellow colour changes to or-
ange/brown.
    N. B. For higher expected chloride levels, reduce the water sample size
e. g. 25 ml will give steps of 40 ppm per tablet used.
    For lower expected chloride levels, increase the water sample size e. g.
100 ml sample will give steps of 10 ppm per tablet used.
    CALCULATION (50 ml Sample)
    Chloride ppm = (number of tablets used·20) – 20.
    For example:
    If 4 tablets are used then chloride ppm = (4·20) – 20 = 60 ppm.
    4. Mark the result obtained on the log sheet provided, against the date
on which the test was taken.
    SAFETY
    Reagents are for chemical testing only. Not to taken internally. Keep
away from children. Wash hands after use.
    TREATING THE SYSTEM
    Treatment is added to the system in the normal way, as per product data
sheet instructions.
    Normal ranges
    P. Alkalinity 100—300 ppm.
    Chlorides 200 ppm maximum.

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