NST_BladderTankCutaway

Standard Features:

  • Vertical construction
  • Carbon steel construction
  • ASME code section VIII, Div. 1
  • Red oxide shop primer exterior
  • Heavy duty Butyl Rubber replaceable bladder
  • NSF 61 for potable applications
  • 125 psi
  • Max Temperature 240 degrees F
  • Lifting lugs
  • 4″ High Skirt with base clips
  • Dried to -50 dew point
  • Pre-charged bladder at 12 psi
  • Quick Ship inventory 5 available sizes from 175 gallon up to 1040 gallon.

Optional Features:

  • 150 psi
  • R-16 Polyurethane, closed sell spray foam insulation w/ acrylic topcoat
  • Stainless steel construction
  • Contact factory for additional features
Thermal Expansion tanks are used to help eliminate the expansion forces caused by heating and cooling of pressurized systems water.  The tank air pressure must be field adjusted for proper system operation.  It is important to properly charge the tank with enough pressure which equals the cold water supply pressure, prior to filling the system.  Failure to properly pressurize the tank will cause the cold supply water to expand the bladder, greatly reduce the expansion capabilities.  The heavy duty butyl rubber bladder keeps the system water separate from the tank, eliminating tank corrosion.  The Niles Steel Tank Expansion tanks are designed for commercial heating applications and potable water applications.   As the water is heated, it expands into the bladder and pushes against the air cushion.  As the system cools, the pressure in the tank pushes the system water back into the piping, maintaining system pressure.

Model Gal. (A) OverallHeight (B) TankHeight (C) Diameter SystemConnection WorkingPressure Weight
EBT-30-063 175 67″ 63″ 30″ 1-1/2″ 125 465
EBT-30-075 210 79″ 75″ 30″ 1-1/2″ 125 505
EBT-30-085 240 89″ 85″ 30″ 1-1/2″ 125 550
EBT-36-072 285 76″ 72″ 36″ 1-1/2″ 125 675
EBT-36-078 310 82″ 78″ 36″ 1-1/2″ 125 707
EBT-36-085 340 89″ 85″ 36″ 1-1/2″ 125 750
EBT-36-090 360 94″ 90″ 36″ 1-1/2″ 125 780
EBT-42-081 435 85″ 81″ 42″ 1-1/2″ 125 1185
EBT-42-084 453 88″ 84″ 42″ 1-1/2″ 125 1216
EBT-42-093 505 97″ 93″ 42″ 1-1/2″ 125 1304
EBT-48-073 500 77″ 73″ 48″ 1-1/2″ 125 1293
EBT-48-096 675 100″ 96″ 48″ 1-1/2″ 125 1550
EBT-48-108 765 112″ 108″ 48″ 1-1/2″ 125 1685
EBT-48-120 860 124″ 120″ 48″ 1-1/2″ 125 1870
EBT-48-141 1040 145″ 141″ 48″ 1-1/2″ 125 2053


Sizing & Selection for Niles Steel Tank EBT Expansion Bladder Tanks:

1. Required total piping system volume: ________ Gallons

Calculate the total length of each pipe size (diameter x length) used in the system.  Add up volume from any storage vessels or holding tanks in the system.

2. Actual Gallon Volume in the boiler: _______ Gallons.  Can be obtained from the boiler manufacturer.

3.  Design water temperature:_________  Ranges from 120 to 180 degrees.

4. Minimum water temperature:________  Typically 90 degrees F.

5.  Supply water pressure:_______  Ranges from 40 to 110 psi.