UFC 3-240-13FN
25 May 2005
6-1.2
Independent QA Analysis. To verify the accuracy of the in-plant testing,
as well as to provide supplemental or additional analyses, independent (third-party) QA
analytical services are incorporated as part of the plant's QA program. These services
can be more complete than routine in-plant testing and can provide a more detailed
analysis of the system conditions. Independent QA analysis is a useful tool for plant
managers and operators to verify that their systems are being maintained properly, and
is an especially important tool for government managers at sites where plant operations
have been contracted out (outsourced).
6-2
COOLING TOWER WATER SAMPLING AND TESTING
6-2.1
Cooling Water Testing Requirements. Water samples from the
recirculating cooling water systems should be tested for pH, conductivity, and inhibitor
content. Calcium hardness and methyl orange (M) alkalinity may also be tested. In
addition, follow the water testing requirements established by the supplier of the water
treatment chemicals where appropriate. Testing parameters for the makeup water
include, as a minimum, M alkalinity, conductivity, and calcium hardness. Appropriate
water testing requirements and sampling frequency are summarized in Table 6-1.
Periodic testing for chlorides in the recirculating water and makeup water may be
required to calculate the most accurate COC in an operating system.
Table 6-1. Recommended Water Sample Frequency and
Testing Requirements for Cooling Tower Systems
Water
M
Conductivity
Calcium
pH
Inhibitor
(or TDS)
Hardness
Tested
Alkalinity
Makeup
--
1/W
1/W
1/W
--
water
Small CT
< 88 kW
1/W
1/W
1/W
1/W
1/W
(25 tons)
water*
Medium CT
88-352 kW
2/W
2/W
2/W
2/W
2/W
(25-100
tons)
water*
Large CT
> 352 kW
1/D
1/D
1/D
1/D
1/D
(100 tons)
water
153
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