Amendment 4_USDA Personal Service Report_20221111.pdf

Company Attention Date : 11-Nov-2022

USDA Troy Dailey, Donal Brown, Kevin Lykins, Ben Rasmussen

Location Nalco copy to

AMES, IA John Ensign Jr, Ethan King

Address

2300 DAYTON AVE

AMES, IA 50010

Summary & Recommendations

ACTION ITEMS:

1. Inspected HRSG2 and collected deposit samples for analysis– Report to follow.

Softeners:

1. Softeners tested soft with zero hardness.

Feedwater:

1. The boiler feedwater conductivity is high at 400 umhos. As we move into winter months and the steam load increases for heat, we anticipate the condensate return quality to improve, thus improving the conductivity of the feedwater and therefore improve cycle chemistry in the boiler.

2. The boiler feedwater hardness level was acceptable at 0.1 ppm.

3. The boiler Trasar controller chemical feed is calibrated and working properly. Trasar in the feedwater was in range at 12.7 ppm and the controller was reading 13.9 ppm.

4. The Trasar ORP probe is calibrated and working properly. ORP was -208 which is in range.

5. The Trasar pH was tested at 10.01. The probe was reading 10.45 and was calibrated to read 10.01.

Condensate

1. The condensate conductivity was high at 132.6 ppm.

2. The condensate pH was higher than normal at 9.99 but showed very little iron at 0.07 ppm and zero hardness. The M-Alkalinity was 8 ppm also indicating the quality of the condensate was good. With repairs being completed on the condensate return lines, we anticipate the quality of condensate and quantity to continue to improve.

Boilers: 1, 2, 3, 4 and 5 were online at time of testing.

Boiler 1:

1. The boiler conductivity was 4725 umhos. The surface blowdown probe was calibrated and working properly.

2. The boiler Trasar inhibitor dosage was at 128.5 ppm and correlated with 10 cycles of concentration. As boiler feedwater quality improves, we expect cycle chemistry to increase.

3. The boiler sulfite concentration was 20 ppm and correlated with boiler cycles. As boiler cycles improve the sulfite concentration will come into range.

4. All other boiler chemistry is as expected.

Boiler 2:

1. The boiler conductivity was 2262 umhos. The surface blowdown probe was calibrated and working properly.

2. The boiler Trasar inhibitor dosage was at 68.5 ppm and correlated with 5.4 cycles of concentration. As boiler feedwater quality improves, we expect cycle chemistry to increase.

3. The boiler sulfite concentration was 15 ppm and correlated with boiler cycles. As boiler cycles improve the sulfite concentration will come into range.

4. All other boiler chemistry is as expected.

Boiler 3:

1. Boiler 3 was not tested as the sample cooler was valved off. I opened the valve and saw that the sample cooler was leaking from the gasket on the top of the cooler as steam was releasing. I closed the valve and notified Ben that the sample cooler was turned off for a reason.

Boiler 4:

1. The boiler conductivity was 1988 umhos. The surface blowdown probe was calibrated and working properly.

2. The boiler Trasar inhibitor dosage was at 49.4 ppm and correlated with 4.9 cycles of concentration. As boiler feedwater quality improves, we expect

Personal Service Report National Animal Disease Center cycle chemistry to increase.

3. The boiler sulfite concentration was 15 ppm and correlated with boiler cycles. As boiler cycles improve the sulfite concentration will come into range.

4. All other boiler chemistry is as expected.

Boiler 5:

1. The boiler conductivity was 4132 umhos. The surface blowdown probe was calibrated and working properly.

2. The boiler Trasar inhibitor dosage was at 119.9 ppm and correlated with 9.4 cycles of concentration. As boiler feedwater quality improves, we expect cycle chemistry to increase.

3. The boiler sulfite concentration was 35 ppm and correlated with boiler cycles. As boiler cycles improve the sulfite concentration will come into range.

4. All other boiler chemistry is as expected.

Cooling Towers:

1. Was offline due to freezing temperatures outside.

Chilled Loop:

1. Not tested

Please do not hesitate to call with any questions.

Thank You.

BOILER SYSTEM TEST DATA AND TRASAR GRAPHS

Boiler System Testing Results 11/11/2022 11:00:00 AM

Sample Point

Hardness

(ppm as

CaCO₃ )

M Alkalinity @

STP (ppm as

CaCO₃ )

Conductivity @

STP (µS/cm) pH @ STP

22310

(ppm)

Total Iron

(ppm)

O

Alkalinity

(ppm as

CaCO₃ )

Sulfite

(ppm)

Cycles based on Cond

(calculated)

Boiler Feedwater 0.10

0.5 Max

40.00

400.00 50 - 400

10.01

8.5 - 9.5

12.70 0.00

Combined

Condensate

0.10 1 Max

8.00 132.60 50 Max

9.99

8.2 - 9.2

0.07

0.3 Max

Boiler 1 320.00 700 Max

4725.00 4000 - 5000

11.45 11 Min

128.50 232.00 50 Min

20.00 30 Min

11.81

Boiler 2 160.00 700 Max

2262.00 4000 - 5000

11.32 11 Min

68.50 144.00 50 Min

15.00 30 Min

5.66

Boiler 4 156.00 700 Max

1988.00 4000 - 5000

11.26 11 Min

49.40 116.00 50 Min

15.00 30 Min

4.97

Boiler 5 280.00 700 Max

4132.00 4000 - 5000

11.98 11 Min

119.90 228.00 50 Min

35.00 30 Min

10.33

Boiler FW ORP and Temperature Graph - Last 30 Days Boiler Feedwater Trasar Dosage Last 30 Days

Boiler FW Conductivity Graph - Last 30 Days Boiler Feedwater pH Graph Last 30 Days

Boilers 1 Conductivity Graph - Last 30 Days

Boiler 2 Conductivity Graph Last 30 Days

Boiler 3 Conductivity Graph Last 30 Days

Boiler 4 Conductivity Graph Last 30 Days

Boiler 5 Conductivity Graph Last 30 Days

COOLING WATER SYSTEMS TEST DATA AND TRASAR GRAPHS

Cooling Systems and City Water Test Results 11/11/2022 11:00:00 AM

Sample Point Conductivity @

STP (µS/cm) pH @ STP

M Alkalinity

@ STP

(ppm as

CaCO₃ )

Hardness (ppm as CaCO₃ )

City Water 458.00 9.20 60.00 180.00

John Ensign | District Representative | 641-260-1819 | john.ensign@ecolab.com Nalco Water, An Ecolab Company | 1601 West Diehl Road | Naperville, IL 60563