User manual | B BI Series Float Thermostatic Steam Traps

B and BI Series Float & Thermostatic Steam Trap
Cast Iron for Horizontal Installation, With Thermostatic Air Vent
Steam Trapping and
Steam Tracing Equipment
For Pressures From Vacuum to 30 psig (2 bar)...Capacities to 8,900 lb/hr (4,037 kg/hr)
C
N
K
H
C
N
H
Alternate
Inlet
M B
B
D
D
Drain
Plug
Model B Traps
Model BI Traps
Description
Options
Armstrong B and BI Series F&T traps combine high standards of
performance and long life with economy for heating service where continuous
drainage with high air-venting capacity is required.
Integral vacuum breaker. Add suffix VB to model number.
CAUTION: Do not use a conventional vacuum breaker open to the atmosphere
in any system that incorporates a mechanical return system that carries
pressure less than atmospheric pressure. This includes all return systems
designated as vacuum returns, variable vacuum returns or subatmospheric
returns. If a vacuum breaker must be installed in such a system, it should be
of the type that is loaded to open only when the vacuum reaches a calibrated
level well in excess of the design characteristics of the system.
Because of the wide use of vacuum returns in systems of this type,
the thermostatic air vent element is charged to give it the capability of
compensated response to the pressure-temperature curve of steam at any
pressure from less than 20'' (500 mm) Hg vacuum to 30 psig (2 bar) gauge.
B and BI Series F&T traps will vent air at slightly below steam temperature
throughout this entire range of operation.
Specification
All B Series traps, except the 1/2'' (15 mm) and 3/4'' (20 mm), have inlet
connections on both sides of the body to provide flexibility in piping. The
BI Series F&T traps in sizes 1/2'', 3/4'' and 1'' feature the convenience of
in-line connections with the same internals as the B Series.
Float and thermostatic steam trap, type ... in cast iron, with thermostatic
air vent.
For a fully detailed certified drawing, refer to CD #1167.
Maximum Operating Conditions
Maximum allowable pressure (vessel design):
Model B2-B3: 125 psig @ 353°F (8.5 bar @ 178°C)
Model B4-B8: 175 psig @ 377°F (12 bar @ 191°C)
Maximum operating pressure:
15B, BI: 15 psig (1 bar) saturated steam
30B, BI: 30 psig (2 bar) saturated steam
How to Order
Pressure
Model
Connection
Size
Option
15
B
2
VB
NOTE: Cast iron traps should not be used in systems where excessive
hydraulic or thermal shock are present.
Connections
B = Standard Connection
Screwed NPT and BSPT
15
30
Materials
Body and cap:
Internals: Valve:
Seat: Thermostatic air vent:
ASTM A48 Class 30
All stainless steel—304
Stainless steel—303 or 440
Stainless steel—303 (ASTM A582)
Stainless steel—440F in 1-1/2'' and 2''
Stainless steel and bronze with phosphor
bronze bellows, caged in stainless steel
B and BI Series Traps
Trap Series
Pipe Connections
*2=1/2"
*3=3/4"
4=1"
5=1-1/4"
6=1-1/2"
8=2"
in
mm
in
mm
VB = Vacuum
Breaker
2=1/2"
3=3/4"
4=1"
BI = In-line Connection
*No alternate inlet available.
B Model
in
mm
in
mm
in
mm
in
BI Model
mm
1/2, 3/4
15, 20
1
25
1-1/4
32
1-1/2
40
2
50
“B” (Height)
4-7/8
124
5-1/2
140
5-1/2
140
7-7/16
189
9-5/8
244
5-5/8
143
“C” (Face to Face)
3-7/8
98
4-7/8
124
4-5/8
117
5-3/4
146
7-5/8
194
5
127
“D” (Bottom to CL)
7/8
22.2
1
25.4
1-7/32
31.0
1-7/16
36.5
1-11/16
42.9
2-11/16
68
5-3/8
137
6
152
7-3/4
197
8-7/16
214
11-5/8
295
6-5/8
168
1/8
3.2
3/8
9.5
—
—
—
—
—
—
—
—
“M” (CL to CL)
2-3/4
69.8
3
76.2
3
76.2
4-3/16
106
6
152
—
—
“N” (Top to CL)
2-9/16
65.1
3
76.2
3-3/8
85.7
3-3/4
95.2
5
127
3-9/32
83
“H” (Width)
“K” (Connection Offset)
Weight lb (kg)
6 (2.7)
8-1/2 (3.9)
11 (5.0)
19 (8.6)
40 (18.1)
1/2, 3/4, 1 15, 20, 25
9-3/4 (4.4)
NOTE: Cast iron traps should not be used in systems where excessive hydraulic or thermal shock are present.
120
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.
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B and BI Series Float & Thermostatic Steam Trap
Cast Iron for Horizontal Installation, With Thermostatic Air Vent
For Pressures From Vacuum to 30 psig (2 bar)...Capacities to 8,900 lb/hr (4,037 kg/hr)
Steam Trapping and
Steam Tracing Equipment
Model B & BI Series Capacity—15 psi
Model B & BI Series Capacity—30 psi
Options
Vacuum Breakers 3/8'' (10 mm) and 1/2'' (15 mm) NPT
Many times, condensate will be retained ahead of steam traps because of
the presence of a vacuum. To break a vacuum, air must be introduced into
the system by means of a vacuum breaker.
For maximum protection against freezing and water hammer in condensing
equipment under modulated control, vacuum breakers are recommended.
Armstrong B and BI Series F&T traps are available with integral vacuum
breakers. Maximum pressure is 150 psig (10 bar).
D
B
Vacuum Breakers
Size
“B” Pipe Connections
in
mm
in
mm
1/2 NPT
15 3/8
NPT
10
3/8 NPT
10
1/4 NPT
6
“C” Height
1-1/4
32
1-3/32
28
“D” Width
7/8 Hex
22 Hex
11/16 Hex
17 Hex
C
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.
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