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509 – Aluminum Standard Stop Log Gate

The Whipps Model 509 Aluminum Stop Log is a lightweight stop log with an open channel design, ideal for narrower channels and moderate water depths. Its corrosion-resistant aluminum construction ensures long-term durability while remaining easy to handle, especially in applications where installation or removal is infrequent. Engineered for dependable sealing and cost-effective performance, the 509 stop logs provides a reliable solution for everyday water control needs.

Series	500 Series
Type	Gates & Flow Control
Category	Stop Log
Mounting Configurations	Channel-Mounted, Embedded Mounting, Wall-Mounted
Materials	Aluminum
Size Range	6" Stop Logs stacked to necessary height – but we can typically accommodate any custom needs.
Industries	Environmental Restoration Projects, Navigation Locks and Canals, Flood Control Systems, Hydroelectric Power Plants, Industrial Water Systems, Mining Industry, Irrigation Systems, Municipal Stormwater Systems, Water and Wastewater Treatment Plants
Shape	Rectangle

General Information

The 500 Series Aluminum Stop Logs from Whipps, Inc. are a modern, high-performance solution for water containment in ponds, tanks, channels, and other flow control applications. Each stop log is designed to be lightweight, corrosion-resistant, and dimensionally stable, making them easier to install and remove, especially in applications where adjustments are infrequent. With a guaranteed leakage rate of only 0.05 gallons per minute per linear foot of wetted seal, operators can count on consistent water control across a wide range of depths and channel widths.

Model Differences: 509 vs. 510 vs. 511

The Whipps 500 Series includes three standard models, each engineered for specific combinations of channel width and water depth:

Model 509 Stop Logs – A 4-inch-thick stop log with an open channel design, best suited for narrower channels and moderate water depths. Its lightweight construction makes it ideal where handling ease and infrequent operation are priorities.

Model 510 Stop Logs – A 6-inch-thick stop log, also with an open channel design, offering greater strength for wider openings and deeper water than the 509 while still maintaining manageable weight for handling.

Model 511 Stop Logs – An 8-inch-thick stop log featuring a closed channel (square pipe) design, built for the heaviest-duty applications. The 511 provides superior strength and stiffness, making it the preferred choice for larger channel widths and higher water depths where additional structural rigidity is critical.

All models feature aluminum construction with UHMW seat/seals, ensuring both strength and resiliency under varying conditions. Combined with Whipps’ precision machining and fabrication, these stop logs deliver long-term performance while minimizing maintenance and replacement needs.

The Stop Log Application Chart (shown above) provides clear guidance on model selection, ensuring that every project achieves the right balance of strength, efficiency, and cost-effectiveness. By choosing the appropriate model based on channel width and head pressure, operators can be confident in the reliable, long-lasting performance of Whipps aluminum stop logs.

Unlike traditional timber stop logs, which can suffer from dimensional instability and unpredictable leakage, our precision-fabricated aluminum logs provide reliable, consistent sealing with long-term durability. In continuous production since 1980, Whipps stop logs have set the standard for lightweight handling, dependable sealing, and cost-effective performance. Whipps offers multiple mounting arrangements and custom configurations, including specialized corner stop log systems that use guideposts to maintain a tight seal even at 90-degree angles.

Product Advantages

Superior Performance

Whipps, Inc. guarantees lower leakage than that listed in AW WA C-SOI- Cast Iron Sluice Gates or the latest revision, AWWA C-560 – Cast Iron Slide Gates. Whipps, Inc. will guarantee leakage of no more than 0.05 gpm/ft of seal perimeter in seating head and unseating head conditions. Including high head service.

Cost

Fabricated stainless steel gates almost always cost less than cast iron gates. As the size of the gate increases, the price difference increases. This is due to the manufacturing process (e.g. casting of parts and subsequent machining) required to produce cast iron gates.

Strength

The ultimate strength of stainless steel is in excess of twice the ultimate strength of cast iron and stainless steel has approximately twice the modulus of elasticity of cast iron.

Durability

Stainless steel resists corrosion better than cast iron. The uv stabilized UHMW seat/seals that are utilized on our stainless steel gates are field proven to maintain shape and integrity in demanding applications. Whipps, Inc. tested the UHMW seatjseals to confirm the ability to withstand continuous operation in an abrasive environment. The testing consisted of 25,000 gate open/close cycles in an abrasive media while experiencing only negligible wear. (Test results available upon request)

Reliability

Unlike traditional cast iron gates, the slide will not “freeze” to the frame after long periods of inactivity. Whipps, Inc. stainless steel gates incorporate UHMW seat/seals to prevent any metal-to-metal contact between the slide and the frame.

Delivery

The fabrication process required to turn raw materials into a stainless steel gate is quicker than the casting and machining process required to turn raw materials into a cast iron gate

Self-Adjusting Seals

The Series 900 stainless steel gates have a self-adjusting seal system that completely eliminates the need for field adjustment. This seal system was developed with the understanding that many gates are installed in locations where field adjustment of wedges is not practical or possible. Another drawback to a wedged system is that wedge adjustment is an inexact science. Wedge adjustment when attempted by inexperienced personnel can lead to additional leakage, difficult gate operation and increased localized gate stresses. The self-adjusting seal system is a combination of durable UHMW seatjseals and a resilient static spring/seal. The UHMW seat/seals are shaped to form a low friction, yet tight, seal with the slide. The spring/seal serves two main purposes: First; it acts as a bulb seal etween the frame and the UHMW seat/seal and secondly; it acts as a “spring” to ensure continuous contact between the UHMW seat; seals and the slide. The spring/seal is stationary, similar to an O-ring seal. and it is protected from wear or damage from the movable slide by the UHMW seatjseals. (Wedges can be provided on our Series 900, but they are not recommended since they do not improve the performance of our gate.)

Low Maintenance

Stainless steel gates do not require periodic painting, and require less operator attention compared to cast iron gates.

Ease of Repair

In the unusual event that the seat/seals are damaged, they can be replaced in the field with common tools. The gate does not have to be removed from the wall. If the seating surface on a cast iron gate is damaged, the gate will have to be removed from the wall and shipped back to the manufacturer for re-manufacture.

Range of Sizes

The process to design and manufacture fabricated gates allows for a nearly unlimited range of sizes. This is not the case with cast iron gates since new patterns or modifications to existing patterns are required to accommodate unusual sizes.

Mounting Configurations

Gate frames may be embedded in the channel walls. mounted to a wall with anchor bolts, mounted to a pipe flange, or wall thimble. Wall thimble mounting is possible although it is usually only necessary for applications with high unseating heads. Gates can also be designed to mount to existing wall thimbles or existing pipe flanges. Flanged frames or flat frames are available for gates to cover square, rectangular or round openings in concrete structures.

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Stainless Steel Gates

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Recent Stainless Steel Gate Water Control Equipment News & Updates

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509 – Aluminum Standard Stop Log Gate

General Information

Model Differences: 509 vs. 510 vs. 511

Product Advantages

Superior Performance

Cost

Strength

Durability

Reliability

Delivery

Self-Adjusting Seals

Low Maintenance

Ease of Repair

Range of Sizes

Mounting Configurations

Recent Stainless Steel Gate Water Control Equipment News & Updates