Alkalinity Builders & pH Control Chemicals

The control of boiler water pH and alkalinity levels are important issue affecting the operation and maintenance of industrial boiler systems and steam raising plant.

Boiler Alkalinity Builders & pH Control Agents

The control of boiler water pH and alkalinity levels are important issue affecting the operation and maintenance of industrial boiler systems and steam raising plant.
To ensure that such boiler systems are well maintained and operate at optimum efficiency it is essential that the correct water conditions are maintained at all times. This can be achieved using carefully selected alkalinity builders designed specifically to control pH in boiler water systems.

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Popular Boiler Alkalinity Builder & pH Control Products

Accepta’s high quality boiler water alkalinity builders and pH adjusters will help control pH levels in industrial boiler systems, hot water systems, and steam raising plant.

Codes
Function
FDA Approval
Description

Alkalinity & pH Control

Yes

FDA Approval

High strength alkalinity builder based on sodium hydroxide / caustic soda (32%)

Alkalinity & Sludge Conditioner

Yes

FDA Approval

Combined alkalinity builder and polymer sludge conditioner

Deposition causes & remedies

The precipitation and deposition of hardness salts in feed water to low pressure boilers is commonly a result of raising the feedwater temperature or the pH value. The later problem should be avoided by the use of alkalinity builders dosed into the hotwell or boiler shell.

Offending hardness salts should be removed only by softening the make-up water (or the feed water if condenser leakage is the source of contamination).

Acid Attack

Acid attack in a boiler can be caused by low make-up feed water pH which attack the metal surfaces within the boiler system either causing a generalised thinning or localised corrosion of high-stress areas. Be aware that the feed water can also become acidic through contamination in the system (process contamination of condensate or cooling water contamination from condensers). To remedy this your treatment regime should include the maintenance of appropriate boiler water alkalinity making sure not to reach excessive levels as this may cause carryover.

Calculate the limiting concentration factor based on TDS and Alkalinity

In a shell steam boiler operating up to 30 bar (435 psi) we are limited by BS2486 to a maximum TDS of 3000mg/L and a maximum Alkalinity (M) of 1200mg/L.  Both of these are usually present in the softened make-up water and both will concentrate up in the boiler.  The question is which will reach its limit first?

To find out divide 3000mg/L by the make-up water TDS to give the limiting concentration factor, based on TDS and divide 1200mg/L by the make-up water alkalinity to give the limiting concentration factor based on alkalinity.  Whichever is the lower is your overall limiting concentration factor.

Example:

Make-up TDS                                    =          150mg/L

Make-up Alkalinity (M)                     =          20mg/L

Therefore limiting concentration factor for TDS    =

3000mg/L = 20

150mg/L

And Limiting concentration factor for Alkalinity (M)    =

1200 = 60

20

Therefore, we should reach 3000mg/L TDS in the boiler before we reach 1200mg/L Alkalinity (M) and hence the overall limiting concentration factor based on TDS is 20.

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