Technical Specifications

SUBMITTAL SHEET: Boiler Liquid
2
SPECIFICATIONS: Boiler Liquid
DIRECTIONS FOR USE
Note: Not for use in domestic potable water systems.
Shake container thoroughly before using. Will not work on cold, unused boiler. If leak prevents
filling boiler, pour boiler liquid through opening nearest leak; this should slow flow enough to fix
the boiler. If crack is large, fill with Hercules pro poxy® 20, steel wool or metallic-foil to retard
flow. Leaks above the water line can be repaired by filling the boiler above the leak.
Use contents of one can (one quart) for each 850 square feet of Boiler Rating. For boilers over
8,500 square feet use one can for each 1,250 square feet. Conversions: 1 square foot of steam =
approx. 240 BTU, 1 boiler H.P. = approx. 34,000 BTU = approx. 140 sq. ft.
Boiler Rating
Sq. Ft. of Steam
Approx. BTU
Equivalent
Quarts of Boiler
Liquid
Required
House Size (if
boiler rating is
unknown)
Typical Sq. Ft.
of Radiation
Quarts of Boiler
Liquid Required
350
85,000
1
2 apartments
500
1
1,500
360,000
2
4 apartments
800
1
3,000
720,000
4
8 apartments
1,200
2
7,000
1,680,000
8
16 apartments
2,200
3
15,000
3,600,000
12
30 apartments
4,000
5
20,000
4,800,000
16
70 apartments
10,000
8
50,000
12,000,000
40
120 apartments
17,000
14
For low-pressure steam and hot water boilers including all one or two pipe house-heating
systems, vapor and vacuum systems:
Make sure water level is below product addition point. Remove safety valve on top of boiler.
Pour in Hercules Boiler Liquid through the safety valve opening. Replace safety valve. Fill boiler
with water and allow pressure to go as high as safety valve will permit. Even though the leak
stops, keep at normal operating temperature from 24 to 48 hours after all the leaks are stopped.
When leaks are severe, it is easier to lower the water below the lowest leak, and pour in Hercules
Boiler Liquid, filling the boiler slowly, and keeping the water extremely hot.
For new heating installations:
Partly fill boiler. Fire to normal operating temperature. Remove safety plug or fitting, depending
on type of boiler, and pour into opening 1 to 2 quarts of Boiler Liquid. Close opening and fill
system gradually, maintaining heat until circulation is complete and all leaks have stopped.
Note: If leak prevents firing of boiler, pour Boiler Liquid into the boiler at any opening nearest the
leak. This should stop leak enough to fire the boiler.
For high-pressure boilers:
Have the boiler at working pressure. Pour in Boiler Liquid through the pump, injector, feed water
or any convenient way. This liquid can be diluted with hot water to make it easier to use. The
objective is to get the liquid into the boiler the simplest and quickest way. Use one part Boiler
Liquid to 100 to 200 parts water according to the size of the leak.
For hot water heating systems:
Drain system until water is below plug at top of boiler. Pour Boiler Liquid into opening on top of
boiler. Replace plug. Refill system slowly, keeping heat above 140°F and making sure all leaks
are covered by water. Continue filling and running system until leaks are sealed. Use 1 quart
Boiler Liquid for each 400-sq. ft. radiation. For large leaks, double the amount. Boiler Liquid can
be used to repair leaks above the water line by filling the boiler above the leak and holding it for
several days. The greater the quantity of Boiler Liquid used and the hotter the fire, the quicker
the leak will stop.