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10
WATER CONTENT OF BOILER
Water Boiler
Steam Boiler
VOLUME OF WATER IN STANDARD PIPE OR TUBE
Nominal
Schedule
Pipe Size
No.
mm
in.
10
3/8
—
13
1/2
40
16
5/8
—
19
3/4
40
25
1
40
32
1
/
40
1
4
38
1
/
40
1
2
51
2
40
64
2
/
40
1
2
76
3
40
II. CLEAN STEAM BOILER SYSTEM.
A. Fill the boiler to water line indicated on the boiler.
B. Follow start-up procedure for burner and operate the boiler with
steam in the entire system for 2 or 3 days to bring oil and dirt
from the system to the boiler. While system is in operation,
maintain the proper water level in the boiler by slowly adding
water to the boiler.
C. Shut down burner, cool down boiler and drain system.
D. Procedure to dissolve oil and grease in boiler:
1. Fill boiler to proper water line.
2. Prepare a boil-out solution of sodium hydroxide (caustic
soda) and tri-sodium phosphate:
NOTE: Use caution in handling chemicals. Caustic soda is
harmful to skin, eyes and clothing.
(a) Proportions: .25 kg (1 lb.) of each chemical per 100 L (50
gallons) of system water.
(b) Stir chemicals into water until dissolved and pour into the
boiler through a top tapping. Replace plug.
3. Start the burner; boil the water for at least 5 hours; shut off
the burner.
E. With CAUTION, drain the boiler solution to a safe location. DO
NOT LEAVE SOLUTION SITTING IN SYSTEM OVER 2
HOURS.
F. Wash the water side of the boiler thoroughly using a high pres-
sure water stream. Fill and drain the boiler several times.
III. TREATING WATER FOR CORROSION CONTROL
(This is not scale control)
A. Prepare a solution of sodium chromate.
Proportions: .25 kg (1 lb.) of each chemical per 100 L
(50 gallons) of boiler water.
B. Stir chemical in water until dissolved and pour into boiler
through a top tapping. Replace plug.
IV. FILLING AND VENTING THE STEAM BOILER
A. Refill the boiler to the indicated water line.
B. Bring water to boiling temperature, promptly.
C. The boiler is now ready to be put into service or on standby.
BLOWING OFF A LOW PRESSURE STEAM BOILER
A. A 1-1/2" NPT tapping is provided in the front of the boiler (tapping
no. 9, figure 1) for use as a surface blow down to provide rapid
skimming of oil and grease which accumulate on the surface of the
water. The boiler should be blown down as outlined below.
B. Turn off electrical power supply to boiler. Allow boiler to cool down
and steam pressure to reduce to zero before removing skimmer
tapping plug. Check for steam pressure by testing the pop safety
TR-20
TR-30
L
U.S.G.
L
U.S.G.
31.4
8.3
40.5
—
—
26.1
Standard Steel Pipe
Inside
Diameter
mm
in.
—
—
16
0.622
—
—
21
0.824
27
1.049
35
1.380
41
1.610
53
2.067
63
2.469
78
3.068
TR-40
L
U.S.G.
10.7
49.6
13.1
6.9
33.3
8.8
Volume per
linear unit.
Diameter
L/m
U.S.G/ft.
mm
—
—
11
0.195
0.0157
14
—
—
17
0.344
0.0277
20
0.557
0.0449
26
0.967
0.0779
32
1.315
0.106
38
2.159
0.174
50
3.090
0.249
63
4.765
0.384
75
valve. Keep your hands and all parts of your body away from the
discharge end of the safety valve. Drain boiler down one to two
inches below skimmer tapping. The water might be hot. Remove
skimmer plug slowly and carefully install a 150 psi malleable iron 1-
1/2" NPT street elbow, a 1-1/2" NPT skimmer valve and length of
pipe and place a bucket underneath the open end of the pipe.
Cover bucket with a piece of cloth. (See figure 9)
C. Fill boiler slowly until water level is two inches from top of gauge
glass. (This is the starting water level for skimming only.) Fire boiler
to produce steam. If the system is heavily laden with oil, it may be
difficult to obtain much more than a pound or so of pressure. Set the
pressure control at about 48 kPa (7 psi). The higher the steam pres-
sure you can use, the better and faster the cleaning.
D. As steam develops, open the SKIMMER drain valve with caution to
skim the oil and film from the top of the water. DO NOT open the
boiler drain valve. Close the skimmer drain valve when the water
level drops to about 127 mm (5") from the top of the gauge glass.
The water may stop before the level drops to 127 mm (5")below the
top of the glass. Refill boiler until water level is again two inches from
the top of the gauge glass.
E. Repeat (D) above until all film is skimmed off and the water
settles to a normal movement. Add make up fresh water to the boiler
as described in (D) above, during the blow-off operation, to maintain
the proper skimming water level in the vessel. Empty bucket fre-
quently in order to see the difference in water cleanliness.
F. When surging has stopped and water is clean, and no film can be
seen floating in the bucket, shut off boiler, drain down to level of
648 mm (25
/
")
1
2
NORMAL
OPERATING
WATER LEVEL
Figure 9
TR-50
TR-60
L
U.S.G.
L
U.S.G.
58.7
15.5
67.4
40.5
10.7
47.7
Type L Copper Tube
Inside
Volume per
linear unit.
in.
L/m
U.S.G/ft.
0.430
0.093
0.0075
0.545
.0150
0.0121
0.666
0.225
0.0181
0.785
0.311
0.0251
1.025
0.532
0.0429
1.265
0.810
0.0653
1.505
1.147
0.0924
1.985
1.998
0.161
2.465
3.078
0.248
2.945
4.393
0.354
TR Series
TR-70
L
U.S.G.
17.8
85.6
22.6
12.6
54.9
14.6
START OF SKIMMING LEVEL
51 mm (2") BELOW TOP OF
GAUGE GLASS
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