Sizing Air Separators

Topics: Pressure, HVAC, Heating, ventilating, and air conditioning Pages: 18 (4443 words) Published: June 24, 2013
SizAir Elimination & Control

In-Line Air Separators
The AC models of air separators deliver all the quality and performance you expect from Taco products. They are built to last with shell, heads and ANSI flanges with ASME constructed for 125, 150, 250 and 300psi working pressures all while providing outstanding performance in the field, up to a maximum operating temperature of 375˚F. The AC product line is available in standard sizes from 2” through 20” to meet the needs of a broad range of applications with custom unit sizes available up to 36” pipe size.

©Taco Catalog #400-1.1 Supersedes: 04/01/86

Effective Date: 04/09/13 Printed in USA

Features & Benefits

Air trapped in the system can produce major problems such as reduced heat transfer, loss of system e ciency, pipe corrosion, pump damage, increased energy consumption and irritating noise. The highly e cient Taco air separator clears the system of free air and reduces un-dissolved sediment to save money, energy and component wear. Unlike many competitive models each unit is designed, constructed and tested to the requirements of Section VIII, Division I of the ASME pressure vessel code as standard. Designed for use in hydronic heating or cooling systems, Taco’s compact, highly e cient air

separator provides air separation while minimizing space requirements. Taco o ers these separators with or without strainers, in standard pipe line sizes from 2” to 20” with custom unit sizes up to 36” pipe size. The wide range of separator models have been developed for applications with owrates up to 12,500 gpm. This wide range of models allows optimum selections with reduced pressure drop requirements. The standard product is designed for working pressures of 125 psi at 375˚F. Optional 150, 250 and 300 psi maximum pressure units, 375˚F maximum temperature units are also available. Taco air separators are manufactured from carbon steel listed in ASME Section II. Consult the factory for higher working pressures, larger sizes or non-standard materials of construction.

Air Separator Flow Pattern
Vent connection allows captured air to be vented to atmosphere (Air Elimination System) or directed to a plain steel expansion tank (Air Control System).

Recommended/Typical Installation


Optional 304 Stainless steel strainer* 3/16 and larger debris captured with strainer.


INLET Water & air mixture through the inlet. Ba e forces change in ow direction and slows the velocity, releasing the air through the vent. OUTLET Return to piping network.

* Provided as standard on F model units


In-Line ASME Air Separators (AC) Taco In-Line Air Separators are applied in commercial, institutional and industrial applications for the removal of free air in water or water/ glycol systems. The In-Line designed air separator utilizes the advantages resulting from large body diameter in relation to the entering nozzle diameter. The design of in-line air separators depends upon the lowering of the system uid velocity within the separator, the change in direction of uid ow within the unit, and buoyant force direct air to the automatic air vent normally positioned at the top of the separator. These air separators are designed, built and stamped to the requirements of ASME. The rated working pressure of these units is dependent upon the design pressure of the hydronic system into which they are being installed. Manufacturers offer these unit working pressures of 125, 150, 250 and 300 psi and higher if required. Optional stainless steel strainers are specified to capture and allow the removal of larger debris. (3/16” and larger) These screens are normally specified with 3/16 inch perforations and free area of not less than 5 times the open area of the nozzle to minimize pressure drop. Most manufacturers provide a blowdown connection at the bottom of the unit....
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