Industry’s Filtration Partner
The Model 91 Fabricated Tee Strainer is available in carbon steel or stainless steel with ANSI Class 150, 300, or 600 flanges or butt weld piping connections. Sizes are available for pipelines from 2" up to 48". This type of tee strainer is typically used for pump protection or other low solids applications.

The Eaton Model 91 Tee Strainer offers several advantages over other strainer designs. The strainer is very compact, important in applications where space is restricted. Unlike most other strainers the Model 91 can be used in both vertical or horizontal installations. A real time saving feature of the Model 91 Tee Strainer is that the strainer screen can be cleaned without draining the strainer vessel.

In many applications the most important feature of the Model 91 is its very low pressure drop as compared to other types of strainers. The combination of a convoluted strainer screen and unrestricted flow path results in very low pressure losses. This low pressure drop makes it ideal for applications such as condensate and boiler feed pump suction where water quality is good and pressure drop is critical.

Two different types of covers are available for the Model 91. The simplest type is the bolted cover which is cost effective and works well in applications where basket changing is infrequent. A davit assembly can also be specified for larger strainers with heavy covers. This makes it possible for a single person to remove the cover of the strainer.

If the strainer will be opened frequently for basket cleaning, a bolted cover is less effective because of the time needed to remove and then tighten the bolts. For these applications, there is a special, hinged, quick-opening cover that is secured by swing bolts. This type of quick-opening cover can even be adapted for higher pressure applications.

Strainer screens for the Model 91 are made of stainless steel – although almost any type of material can be specified. Screen perforations from 1/16" up to 1/2" are available and mesh linings in sizes from 20 to 60 mesh for fine straining applications can be specified. The unique convoluted design of the strainer screen doubles the screen area and completely changes the dirt accumulation pattern on the screen. This makes more effective use of the screen’s straining area and increases the time between screen cleanings.

In larger sizes, because of greater screen area, the Model 91 can be an economical and functionally better choice than the traditional Y strainer.

The Eaton Model 91 Fabricated Tee Strainer will meet the requirements of most tee strainer applications. For those that it doesn’t, it is also easy to customize the strainer to meet special application requirements. The strainer can be designed to meet very tight dimensional restrictions. The Model 91 can also be adapted for straight through or right angle flow, making it ideal for retrofit situations in which strainers were initially omitted.

Steam jacketing is another option available for fabricated tee strainers. Steam jacketing is used to maintain critical fluid temperatures through the strainer. High temperatures are often required to process and transport highly viscous fluids. This modification is designed and effected without any impact on the function or normal maintenance of the strainer. Steam jacketing is available in either carbon steel or Type 316 stainless steel for services of up to 450ºF.

The Eaton Model 91 Strainers can be designed and fabricated to ASME section VIII and ANSI B31.1 codes.
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Item #

Strainer Model

Cover Type

Nominal Size

Perforation Size

Nominal Area of Pipe

Gross Screen Area

item-5784 N/A Model 91 N/A Bolted Cover N/A 2 in N/A 5/32 in N/A 3.35 in² N/A 23 in²
item-5785 N/A Model 91 N/A Bolted Cover N/A 3 in N/A 5/32 in N/A 7.39 in² N/A 41 in²
item-5786 N/A Model 91 N/A Bolted Cover N/A 4 in N/A 5/32 in N/A 12.73 in² N/A 58 in²
item-5787 N/A Model 91 N/A Bolted Cover N/A 5 in N/A 5/32 in N/A 20.00 in² N/A 82 in²
item-5788 N/A Model 91 N/A Bolted Cover N/A 6 in N/A 5/32 in N/A 28.90 in² N/A 105 in²
item-5789 N/A Model 91 N/A Bolted Cover N/A 8 in N/A 5/32 in N/A 50.02 in² N/A 167 in²
item-5790 N/A Model 91 N/A Bolted Cover N/A 10 in N/A 5/32 in N/A 78.85 in² N/A 234 in²
item-5791 N/A Model 91 N/A Bolted Cover N/A 12 in N/A 5/32 in N/A 111.93 in² N/A 322 in²
item-5792 N/A Model 91 N/A Bolted Cover N/A 14 in N/A 5/32 in N/A 135.28 in² N/A 419 in²
item-5793 N/A Model 91 N/A Bolted Cover N/A 16 in N/A 5/32 in N/A 176.71 in² N/A 511 in²
item-5794 N/A Model 91 N/A Bolted Cover N/A 18 in N/A 5/32 in N/A 223.68 in² N/A 639 in²
item-5795 N/A Model 91 N/A Bolted Cover N/A 20 in N/A 5/32 in N/A 277.95 in² N/A 781 in²
item-5796 N/A Model 91 N/A Bolted Cover N/A 24 in N/A 5/32 in N/A 402.00 in² N/A 1057 in²
item-5797 N/A Model 91 N/A Quick-Opening Hinged Cover N/A 6 in N/A 5/32 in N/A 28.90 in² N/A 105 in²
item-5798 N/A Model 91 N/A Quick-Opening Hinged Cover N/A 8 in N/A 5/32 in N/A 50.02 in² N/A 167 in²
item-5799 N/A Model 91 N/A Quick-Opening Hinged Cover N/A 10 in N/A 5/32 in N/A 78.85 in² N/A 234 in²
item-5800 N/A Model 91 N/A Quick-Opening Hinged Cover N/A 12 in N/A 5/32 in N/A 111.93 in² N/A 322 in²
item-5801 N/A Model 91 N/A Quick-Opening Hinged Cover N/A 14 in N/A 5/32 in N/A 135.28 in² N/A 419 in²
item-5802 N/A Model 91 N/A Quick-Opening Hinged Cover N/A 16 in N/A 5/32 in N/A 176.71 in² N/A 511 in²
item-5803 N/A Model 91 N/A Quick-Opening Hinged Cover N/A 18 in N/A 5/32 in N/A 223.68 in² N/A 639 in²
item-5804 N/A Model 91 N/A Quick-Opening Hinged Cover N/A 20 in N/A 5/32 in N/A 277.95 in² N/A 781 in²
item-5805 N/A Model 91 N/A Quick-Opening Hinged Cover N/A 24 in N/A 5/32 in N/A 402.00 in² N/A 1057 in²
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