Brochure

Compression Tank & Airtrol Fittings
Pre-charge tanks are designed to absorb the forces of thermal expansion in hydronic heating and
cooling systems. The rubber membrane completely isolates the air from the system fluid, which prevents
waterlogging of the tank. The pre-charge minimizes the size of the tank.
Construction:
One piece cast iron
Maximum operating limitations:
Working pressure: 175 psig (12.1 Bar)
Temperature: 300°F (149°C)
In-Line Air Separator Model IAS Air Control
Bell & Gossett In-Line Air Separators are designed to effectively
separate free air in hydronic heating/cooling systems. The air
separators are a single piece of cast iron with an integral weir,
designed to reduce system flow to maximize air separation.
The IAS-1½ and IAS-3 have a ¾” NPT tapping to accept a high
capacity air vent or can be piped to a plain steel compression
tank. The IAS-1 and IAS-1¼” have a
1
/ 8” vent tapping to accept
an air vent. All models have a ½” NPT bottom tank connection.
Model EAS Enhanced Air Separator
The Enhanced Air Separator is an efficient device designed
for air separation in residential or light commercial hydronic
heating or cooling systems. It differs from an air scoop
because it has an internal diffuser and coalescing
medium. The diffuser forces the system fluid to cover
the entire inlet portion of the coalescing medium. Air
bubbles, including micro air bubbles, will separate
from the system fluid and adhere to the stainless
steel coalescing medium. The separated air rises to
the top of the separator where it is vented to the
atmosphere through an automatic air vent or
directed to a standard compression tank. The
EAS comes ready for installation as a straight
or angle-pattern pipe design.
Series B
• ASME Section VIII, Division 1
design and constructed
• Heavy duty full acceptance
replaceable butyl bladder
• Sizes: 53 - 3,963 gallon
• Factory pre-charge to 12 PSI,
adjustable in the field
• High pressure models up to
250 PSI available
• Seismic restraints available
• California-code sight glass
available
Series B-LA
• ASME Section VIII, Division 1
design and constructed
• Economical heavy duty
replaceable butyl bladder
• Sizes: 10 - 158 gallon
• Factory pre-charge to 12 PSI,
adjustable in the field–
• Seismic restraints available
• California-code sight glass
available
The plain steel compression tank
absorbs the expansion of system fluid in
hydronic heating and cooling systems,
and provides proper pressurization
under varying operating conditions.
When used with Airtrol Tank Fittings,
it provides positive air control.
Plain Steel Compression Tanks
• ASME Section VIII, Division 1 design
and constructed
• Sizes: 15 – 505 gallons
• Gauge glass tappings are standard
• High pressure models available
• Custom tanks with additional
tappings and alternative materials
of construction are available
Series D
• ASME Section VIII, Division 1
design and constructed
• Economical fixed butyl
diaphragm
• Sizes: 8 - 211 gallon
• Vertical and horizontal designs
• Factory pre-charge to 12 PSI,
adjustable in the field
• Seismic restraints available
• California-code sight glass
available
Airtrol
®
Tank Fittings direct free
air to the compression tank and
restrict thermal circulation to the
boiler. The fitting establishes
initial tank air level and allows
a reduction in compression
tank size. An Airtrol Tank Fitting
should always be used with a
plain steel compression tank.
Do not use with pre-charged
diaphragm and bladder tanks.
Construction:
Enhanced Air Separator cast iron body and cap;
stainless steel internal Air Vent: brass body, nonferrous
internals
Maximum operating limitations:
Working pressure: 150 psig (10.3 Bar)
Temperature: 250°F (121°C)
Model
Number
Part
Number
Size NPT
Vent
Tapping
Max Flow
Rate (GPM)
IAS-1 112118 1”
1
/
8
” 15
IAS-1 ¼ 112119 1 ¼”
1
/
8
” 25
IAS-1 ½ 112097 1 ½” ¾” 35
IAS-2 112098 2” ¾” 50
IAS-2 ½ 112099 2 ½” ¾” 75
IAS-3 112100 3” ¾” 125
Model
Number
Part
Number
Size Inches
Max Flow
Rate (GPM)
EAS-1 112105 1” 35
EAS-1-1/4 112106 1 ¼” 35
EAS-1-1/2 112107 1 ½” 45
EAS-2 112108 2” 70
10