MIL-HDBK-1003/6
Table 20 (Continued)
Chemicals for Internal Boiler Water Treatment
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*
*
* Comment
*
Chemicals
Purpose
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* Seaweed derivatives; * Provide a more fluid
* Organics often classed *
* (Sodium alginate,
* sludge and minimize
* as reactive colloids
*
* carryover.
* since they react with
*
* Sodium mannuronate)
*
* calcium and magnesium
*
*
*
*
* and absorb scale
*
*
*
* crystals.
*
*
*
*
*
* Antifoams;
* Reduce foaming
* Usually added with
*
* tendency of highly
* other chemicals for
*
* (Polyamides, etc).
* concentrated boiler
* scale control and sludge*
*
*
* water.
*
*
* l25 psig and above,
*
*
*
*
* all power plant
*
*
* boilers.
*
*
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Notes:
(1)
Hydrazine and Morpholine are highly toxic. Care must be exercised and
mixing and feeding equipment must be provided to prevent skin contact
or inhalation of chemical.
(2)
Provide adequate ventilation, washing facilities, eye wash, protective
clothing and mask storage in the storage and handling area.
Use one of the following chemical feeding
7.4.2.2
Feeding Schemes.
methods.
a) Scheme 1 (see Figure 27). This method may be used where there
is no feedwater heater and where space permits a setting for the chemical
mixing tank, high enough to overcome the suction pressure of the boiler
feedwater pump. An agitator may be needed to properly mix powders. The only
equipment needed is a chemical mixing tank and valved piping, or tubing from
the tank to the suction side of the boiler feedwater pump. All chemicals,
including polyphosphates but not orthophosphates, may be fed in this manner.
Sodium sulfite injected in this way protects both the feedwater
suction piping and the boiler feedwater pump from oxygen corrosion.
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