Table of Contents
- 1 What is the normal range in ppm of chloride in boiler water?
- 2 What is the acceptable chloride value of boiler water?
- 3 What is the ASME recommended limit of chlorides for boiler feedwater?
- 4 What is the standard value of hydrazine in boiler water?
- 5 How can we reduce the conductivity of boiler water?
- 6 What is the maximum limit of salinity in high pressure water tube boilers feed water?
What is the normal range in ppm of chloride in boiler water?
Boiler water test
| Table 1 – Recommended boiler water characteristics | ||
|---|---|---|
| Boiler pressure bar | pH | Chlorides max ppm CI |
| 0-15 | 10.5-11.5 | 300 |
| 15-30 | 10.5-11.5 | 150 |
What is the acceptable chloride value of boiler water?
Formation of chloride ions can be done by controlling the amount and time of boiler blow down. Standard value of chloride ion is less than 300 mg Cl/l. When calcium phosphates is formed it precipitates on the water surface and can be easily removed by blow down.
What are the normal boiler water parameters?
The pH value of the boiler water is a number between zero and fourteen. The pH should be maintained between a minimum of 10.5 and a maximum of 11.0 to prevent acidic corrosion of boiler tubes and plates, and to provide for the precipitation of scale forming salts before scale is deposited.
What is chloride test in boiler water?
The chloride test is used (often in conjunction with the conductivity test) to regulate boiler blowdown. The chloride test is also useful in determining the percentage of condensate return and in finding out if the condensate is contaminated by process water in-leakage or carryover.
What is the ASME recommended limit of chlorides for boiler feedwater?
EPRI does have recommendations on chlorides for power boilers such as for boilers operating under all volatile treatment EPRI recommends <0.22 ppm for 1500 psi boilers and <0.05 ppm for 2500 psi boilers.
What is the standard value of hydrazine in boiler water?
The normal level of hydrazine reserve to be maintained in the boiler water is between 0.1 and 0.3 ppm N2H4. As the products of reaction are harmless – nitrogen as and water, hydrazine treatment does not increase the dissolved solids content of the boiler water.
How do you treat chloride in boiler water?
When it comes to chloride concentration, there isn’t a “chemical treatment” to reduce its levels in the vessel’s boiler water. If the concentration is too high, you will simply need to blowdown and make sure that the replacing water has a lower chloride concentration.
Is standard for boiler water quality?
As a rule of thumb, about 1000 ppm can be considered a safe maximum. A hard water containing 200 ppm in the feedwater would tolerate five concentrations in the boiler (200 times 5 = 1000). On the other hand, a soft water with 25 ppm could be concentrated 40 times before reaching the critical point (40 times 25 = 1000).
How can we reduce the conductivity of boiler water?
Internal Boiler Water Treatments The main internal treatment solutions that you might want to consider include softening chemicals, anti-scaling agents, oxygen scavengers, sequestering agents, and anti-foaming agents, all of which can help with the reduction of conductivity.
What is the maximum limit of salinity in high pressure water tube boilers feed water?
1) If the feedwater sample for a packaged watertube boiler operated at 100 psig shows a total alkalinity (as calcium carbonate) of 70 ppm and the maximum allowed is 700 ppm; therefore, the concentration limit is 10.
What is pH range for oxygen removal?
between 8.5 and 9.5
The consensus is that feedwater oxygen, iron, and copper content should be very low (e.g., less than 7 ppb oxygen, 20 ppb iron, and 15 ppb copper for a 900 psig boiler) and that pH should be maintained between 8.5 and 9.5 for system corrosion protection.