FULTON VSRT Series, Инструкция по установке, эксплуатации и обслуживанию

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SECTION 2
VSRT-IOM-2022-0728
INSTALLATION
2-35
Water Chemistry
RECOMMENDED WATER CONDITIONS FOR BOILERS/
UNFIRED STEAM GENERATORS
Table 6 lists recommendations for feed water and boiler water.
Contact your local water treatment professional for testing
and treatment recommendations. It is very important that a
strict water treatment program is followed.
It is critical that the boiler water chemistry follow Table 6
whenever water is in the boiler. Solids that enter with the
feed water will concentrate in the boiler. A regular schedule of
boiler blowdown (see
Maintenance section of this manual)
must be maintained to prevent high solid concentrations
from corroding the vessel or forming deposits.
Steam Outlet
It is recommended to have 30 inch or five pipe diameter
(whichever is greater) of vertical rise out of the steam outlet.
This is considered a good piping practice and will allow for
proper operation.
Steam outlet sizes should not be reduced until after the steam
outlet and at the end of the near boiler piping, as shown in
Figure 26. Steam piping should be sized for appropriate
velocities for the application and pressure. Steam piping
shown in
Figure 26 is to be sized for 4,500 ft./min. This piping
includes the steam outlet piping through the outlet of the
main steam header. After the main steam header, distribution
piping may be sized for velocities of 4,000 – 6,000 ft./min.
for low pressure steam (0-30 PSIG), 6,000 – 8,000 ft./min. for
medium pressure steam (30 -75 PSIG), and 8,000 – 12,000 ft./
min. for high pressure steam (75 PSIG and above).
Carbon Steel Stainless Steel
Parameter Feedwater Vertical Boiler/
SteamPac Water
Horizontal Boiler/
SteamPac Water
Feedwater Vertical Boiler/
SteamPac Water
Horizontal Boiler/
SteamPac Water
pH 7.5-9.2 8.5-10.5 8.5-10.5 6.0-9.2 8.5-10.5 8.5-10.5
Feedwater Temperature 140 F (60 C)* --- --- 140 F (60 C)* --- ---
Hardness as CaCO
3
< 2ppm < 10 ppm < 15 ppm < 2ppm < 10 ppm < 15 ppm
Chlorides --- *** *** --- 50 ppm 50 ppm
Total Alkalinity --- < 300 ppm < 500 ppm --- < 300 ppm < 500 ppm
OH Alkalinity --- 200-300 ppm 200-300 ppm --- 200-300 ppm 200-300 ppm
Total Dissolved Solids --- < 2000 ppm < 3000 ppm --- < 2000 ppm < 3000 ppm
Suspended Solids No visual turbidity** No visual
turbidity**
No visual
turbidity**
No visual
turbidity**
No visual
turbidity**
No visual
turbidity**
Total Organic Carbon No sheen
No foam +
No sheen
No foam +
No sheen
No foam +
No sheen
No foam +
No sheen
No foam +
No sheen
No foam +
Iron 0.1 ppm and
colorless +
0.1 ppm and
colorless +
0.1 ppm and
colorless +
0.1 ppm and
colorless +
0.1 ppm and
colorless +
0.1 ppm and
colorless +
Dissolved Oxygen <1 ppm* ND ND < 5 ppm ND ND
Visual Oil ND ND ND ND ND ND
Conductivity (mS/cm) --- < 2985 < 4477 --- < 2985 < 4477
* This is a minimum temp. Feedwater temperatures below 200 F (93 C) will require an oxygen scavenger.
**Suspended solids: Take a water sample. After the sample sits for 10 minutes, no solids should be visible.
+Total Organic Carbon: Take a water sample. Shake vigorously for 30 seconds. No sheen or foam should be visible.
++ Iron: Take a water sample. The upper limit is 0.1 ppm. Hold the sample against a white background. The water should have no visible
yellow, red or orange tinge.
ND: None Detected
ppm: parts per million
TABLE 6 - WATER CHEMISTRY REQUIREMENTS FOR FULTON BOILERS