Brentwood flight scrapers in a rectangular clarifier.

TrueSpan™ Flight

The Polychem TrueSpan flight scraper streamlines installation and reduces downtime with a simple, standardized approach to flight assembly. Its configurable design allows for field adjustment without the need for premeasuring or fabrication, reducing installation complexity and potential for error. With in-stock availability and components designed to be cut to length on site, TrueSpan systems facilitate efficient assembly and support reliable, long-term operation in rectangular clarifiers.

Benefits
Adjustable centerlines to fit any tank condition
No premeasuring existing flights
No notching, flight drilling, or fab errors
Capability to offset floor wear shoes from chain
Smart stock lengths minimize scrap costs
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Specifications

English Metric
Profile (in)Depth (in)Width (in)Max Span Range (ft)ExI Stiffness Factor
(lb-in²)		Average Weight (lbs/ft)MaterialMax. Water Abs. @ 24hrs (%)
3x87.52.522 (4-Shaft System) - 24 (3-Shaft System)9.31x10⁶2.41Glass Reinforced Isophthalic Polyester0.6
Profile (mm)Depth (mm)Width (mm)Max Span Range (m)ExI Stiffness Factor (N-m²)Average Weight (kg/m)MaterialMax. Water Abs. @ 24hrs (%)
76.2 x 230.1190.563.56.7 (4-Shaft System) - 7.3 (3-Shaft System)2.67x10⁴3.59Glass Reinforced Isophthalic Polyester0.6
A close-up view of industrial machinery with cogwheels, head shafts, and a chain, all shown in a blue-tinted color scheme.
System Animation

Learn how all the components in a Polychem TrueSpan system are assembled and installed.

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TrueSpan System Components

TrueSpan Adjustable Head Shafts
TrueSpan Adjustable Stub Shafts
TrueSpan Adjustable Wall Brackets
TrueSpan Adjustable Head Shafts

Our FRP TrueSpan head shaft features an elongated common key end tube design that uses in-stock shaft components to minimize design and lead times, simplify inventory, and maximize adjustability.

TrueSpan Head Shaft
TrueSpan Adjustable Stub Shafts

Three configurable stub shaft sizes offer onsite adjustment to accommodate wall variations and sprocket centerline considerations.

TrueSpan Stub Shaft
TrueSpan Adjustable Wall Brackets

TrueSpan wall brackets can be cut in the field to accommodate wall inconsistencies and to reduce lead times and customization. Three standard sizes are readily available, or custom lengths can be furnished.

A field adjustable head shaft A photograph of a TrueSpan Head Shaft. A TrueSpan bracket.

Articles & Literature

Rectangular clarifier systems
Rectangular vs. Circular Clarifiers: What is the Best Option?
Clarifiers are crucial in water and wastewater treatment processes as they help separate solid particles from liquids. However, selecting the right type of clarifier can be a daunting task. This article will compare the two most commonly used clarifier shapes, rectangular and circular, to help you decide which is best for your application.
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Literature
TrueSpan Field Adjustable Flight Scraper TrueSpan Field Adjustable Head Shaft TrueSpan Field Adjustable Stub Shaft Polychem Chain & Flight Brochure Polychem Field Services
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    TrueSpan™ Flight
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