Tillie Doyle
Divided pans are used in maple syrup production to enable continuous flow boiling. They contain a series of connected channels that allow for the continuous addition of raw sap, which pushes existing sap further into the system. This process establishes a density gradient, with the sap closest to the draw-off valve being the darkest and having the highest sugar density. The dividers in the pan allow for the gradual drawing off of syrup, eliminating the need to produce syrup in large batches. Divided pans offer flexibility in syrup production, as they can be customised with features like level assist markings, reversible flow, full-length handles, and efficient construction materials.
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What You'll Learn
Continuous flow boiling
Divided pans have dividers that enable continuous flow boiling by allowing sap to be drawn off little by little, rather than in one large batch. The dividers are formed right into the body of the pan, and the pan can be designed with either parallel or cross-flow channels. Cross-flow pans are designed for extremely high output, while parallel flow pans are more efficient in terms of time, labour, and materials.
To maintain a consistent boil, sap must be continuously added to the back corner of the pan, which pushes the existing sap further into the system. This process establishes a "density gradient" in the pan, with the starting point of the channels containing raw sap and the sap closest to the draw-off valve being the darkest and most condensed. By monitoring the temperature, producers can determine when to start and stop drawing off the finished syrup.
The reversible design of some divided pans allows for reversing the flow of sap through the channels, helping to deter sugar sand buildup on the bottom of the pan. Continuous flow boiling also offers the advantage of filtering and bottling syrup as the process progresses, rather than waiting until the end. Additionally, the level assist feature in some pans, such as the Smoky Lake pans, helps to determine the appropriate sap depth before boiling.
Overall, continuous flow boiling in a divided pan offers several benefits, including the ability to produce lighter syrup, draw off syrup gradually, and maintain a consistent boiling process.
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Density gradient
A divided sap pan is a continuous flow pan that contains a series of connected channels. Raw sap is continuously added to the back corner of the pan, pushing the existing sap further into the system. This process establishes a "density gradient", with the "starting point" of the channels containing raw sap, and the sap closest to the draw-off valve being the darkest and having the highest sugar density. The sap in between these two points is progressively darker and more condensed as it gets closer to the draw-off valve.
The density gradient is maintained by the continuous addition of raw sap to the back corner of the pan. This new sap pushes the existing sap further through the channels, creating a natural gradient. The dividers in the pan enable this "continuous flow boiling", allowing syrup to be drawn off little by little, rather than in one large batch. This continuous flow also means that the syrup can be filtered and bottled as you go, rather than having to wait until the end.
The density gradient is important for determining when to start and stop drawing off the finished syrup. Syrup is considered "finished" when it reaches 7ºF above the boiling point of water. By monitoring the temperature and the density gradient, the sap can be drawn off at the optimal time.
Maintaining a consistent sap depth of 2" is crucial for the proper functioning of the divided sap pan. This depth ensures that the pan does not overheat and protects the syrup from scorching. Various tools, such as a Feed Pan, Float Box, and Sight Glass, can assist in regulating the sap depth and maintaining the density gradient.
The design of the divided sap pan, with its interconnected channels and dividers, facilitates the establishment and maintenance of the density gradient. This gradient is essential for producing maple syrup with the desired sugar concentration and consistency. By continuously adding raw sap and monitoring the temperature and sap depth, the density gradient can be effectively managed to achieve optimal results in syrup production.
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Draw off syrup
The dividers in a divided sap pan enable "continuous flow boiling", allowing syrup to be drawn off little by little, rather than in one large batch. Raw sap is continuously added to the back corner of the pan, pushing the existing sap further into the system. This creates a "density gradient", with the sap closest to the draw-off valve being the darkest and having the highest sugar density.
By watching the temperature, you can determine when to start and stop drawing off the finished syrup. Syrup is typically finished at 7ºF above the boiling point of water. It is important to maintain a 2" sap depth to protect the pan from overheating and the syrup from scorching.
Some methods of adding sap to the pan while boiling include using a Feed Pan, a Float Box, or a Sight Glass. The Feed Pan sits on top of the evaporator pan and is filled with raw sap, which slowly trickles into the main pan through a valve. The Float Box allows you to set a depth for the sap level, which it will then maintain automatically. The Sight Glass is a tool that allows you to verify the depth in your pans, even during boiling.
When drawing off the syrup, it is possible to leave a slight film of syrup in the bottom of the pan, quickly adding cool sap to kill the boil and keep everything lukewarm. However, this strategy can be risky, especially with a hot fire, as flat pans can scorch very quickly.
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Flat pans vs. divided pans
Flat pans and divided pans are both used in maple syrup production. Flat pans are open pans that do not contain any dividers, whereas divided pans contain a series of connected channels. Flat pans are used for ""batch boiling", which means that you create one big batch of syrup. You continue boiling until the entire pan of syrup has reached 66% or greater sugar density. Once that batch is done, you have to start a new batch from scratch. Flat pans are very economical and great for entry-level hobbyists as they are straightforward to operate.
Divided pans, on the other hand, enable "continuous flow boiling", which means that you do not have to wait for the entire pan to become finished syrup. Instead, you can draw off syrup in smaller amounts as you go. This is achieved through the series of connected channels in the pan. Raw sap is continuously added to the back corner of the pan, pushing existing sap further into the system and creating a ""density gradient". The sap closest to the draw-off valve will be the darkest and have the highest sugar density. Divided pans can make lighter, more delicately flavoured syrup than flat pans because the sap does not sit in the pan for as long. Divided pans are also reversible, which helps to deter sugar sand buildup on the bottom of the pans.
While flat pans are generally more economical and better suited for beginners, divided pans offer the advantage of continuous flow boiling, allowing for more flexibility in syrup production. Divided pans are also useful for producing lighter-coloured and more delicately flavoured syrup. Ultimately, the choice between a flat pan and a divided pan depends on the specific needs and preferences of the maple syrup producer.
It is worth noting that some sources suggest that flat pans can also produce light-coloured syrup, especially at the beginning of the season. Additionally, flat pans may be more cost-effective than divided pans, especially for those with limited sap access.
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Reversing the flow
The reversible flow feature of divided pans offers several advantages. Firstly, it helps prevent sugar sand buildup, ensuring a smoother and more efficient boiling process. Secondly, it allows for gradual filtering and bottling, reducing the time and effort required compared to batch processing. This feature is especially beneficial for those seeking to produce lighter, more delicate-flavored syrup.
The reversible flow also contributes to the overall efficiency of the syrup-making process. By altering the flow direction, users can manage the sap depth in the pan more effectively. Maintaining the appropriate sap depth is crucial for protecting the pan from overheating and preventing the syrup from scorching. With the reversible flow, users can adjust the flow to ensure the sap depth remains within the optimal range.
Additionally, the reversible flow enhances the versatility of the divided pan. Users can customize the flow direction to suit their specific needs or preferences. This adaptability makes the divided pan suitable for a wider range of applications and user experiences, from beginners to experienced syrup producers.
The reversible flow feature is a unique aspect of divided pans, setting them apart from traditional flat pans. Flat pans, which lack dividers, are typically used for "batch boiling," resulting in darker and more robust syrup. In contrast, the reversible flow in divided pans enables continuous flow boiling, producing lighter and more delicate syrup.
Overall, the ability to reverse the flow of sap in divided pans is a significant advantage that enhances the efficiency, versatility, and ease of use for syrup producers. By utilizing this feature, users can better manage the boiling process, prevent issues like sugar sand buildup, and ultimately produce high-quality syrup with greater control and convenience.
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Frequently asked questions
A divided sap pan is a pan that contains a series of connected channels. It is used to enable continuous flow boiling, so you don’t have to make syrup in one big batch.
Raw sap is continuously added at the back corner of the pan, pushing existing sap further into the system. This creates a "density gradient", with the starting point of the channels being raw sap, and the sap closest to the draw-off valve being the darkest and most condensed. By watching the temperature, you can determine when to start and stop drawing off the finished syrup.
Divided sap pans allow you to draw off syrup little by little, rather than making one huge batch all at once. They also help to prevent sugar sand buildup on the bottom of the pans and make it easier to filter and bottle your syrup as you go.
