Wright-Austin Type T Gas Liquid Separators

Type T gas/liquid separators employ the three basic principles of separation: 1. Change in Velocity 2. Torturous Path 3. Centrifugal Force

Type T centrifugal gas/liquid separators have a cylindrical shaped body oriented vertically, requiring the flow path to change directions within the separator body. Looking at the elongated body with inlet/outlet ports 180 degrees apart and on the same plane, it sort-of resembles the letter “T”.

There are four “T shaped” separator designs: T, TS, R and ST. The difference between the T, TS and R versions is the flow rate of entrained droplets that can be removed. The Type T separator has an entrained droplet separation capacity equivalent to 40% of its maximum weight flow capacity. The Wright-Austin Type TS style centrifugal separator increases the separation rate to 60% of its maximum weight flow capacity due to an elongated sump. The Wright-Austin Type R gas/liquid separator design increases separation to 90% of its maximum weight flow capacity due to increased complexity within the separator body. The Type R is often the most compact option although due to its internal complexity it is also more expensive. We typically compare an oversized T or TS to a smaller sized Type R to determine which configuration is best suited for a given application.

The Type T design is offered in both cast iron and custom fabricated designs.

Cast Iron Type T Gas/Liquid Separators

Cast iron Type T gas/liquid separators are designed to remove entrained liquid and solids from air, steam or any gaseous media compatible with cast iron. The T design can remove entrained liquid at a rate equivalent to 40% of the maximum weight flow capacity for a given size separator body, removing entrained droplets >10 microns with 99% efficiency. Due to the cast iron design an ASME Code Stamp or CRN is not applicable. If you require an ASME Code Stamp or CRN it will need to be a fabricated design in carbon steel, stainless steel or some other alloy. The cast iron version is commonly used for steam and compressed air applications.

99% efficiency for removing droplets >10 microns is accomplished by creation of a powerful centrifugal vortex within the separator body. Droplets and particles larger than 10 microns are tossed to the vessel walls where they coalesce to larger droplets and collect at the drain port. Re-entrainment is prevented due to a vortex containment plate (VCP) located just above the drain port. Dry gas and droplets finer than 10 microns exit through the center of the vortex and out the discharge nozzle.

There are no moving parts or serviceable components within a cast iron type T separator. If fluid is allowed to accumulate and sit in the separator, perhaps due to a faulty drain valve, it is possible for the lower body to become severely corroded. Other than that, cast iron T style separators have a decades long service life with zero maintenance required!

If the separated liquid is not drained from the separator body before rising above the VCP, re-entrainment is likely. The simplest way to drain fluid from the separator is to attach a ball valve on the drain port, which can be manually opened or automated based upon a timer. Using a ball valve risks loss of some process gas during drainage, so consider using a Type 90-AC float drain trap instead; it automates the drainage process mechanically and ensures no process gas loss during drainage.

The Wright-Austin Type ST separator is a variation of the cast iron Type T separator; it is only available in cast iron material and it is an abbreviation for “Separator Trap”, thus has an internal float drain trap to drain the separated liquid from the separator sump without loss of steam/air/gas. The cost of a Type ST separator is about the same as purchasing a cast iron Type T separator and cast iron 90-AC float drain trap separately, however installation is simplified.

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