The air used is compressed to a pressure of two to three pounds by an ordinary rotary, low pressure, air blower. The air is cooled before entering the cans by being passed through a shell and tube water-cooled air conditioner.
The main air header extends along one end of the freezing tank, and secondary headers extend from it to the other end of the freezing tank. These headers are arranged in grooves in the framework, one between each alternate row of cans and are equipped at each can with a special air valve which closes automatically when not in use. The end of the support pipe for the drop pipe is fitted with a ball shaped fitting which rests on the air valve. When the drop pipe is placed in the can this ball fitting opens the air valve and is kept in place by its own weight.
All fittings and pipes in Frick Raw Water Freezing Systems subjected to the possibility of rusting are either made of brass or are heavily galvanized. This feature not only increases the useful life of the pipes and fittings but eliminates all possibility of the water becoming contaminated by absorbing impurities resulting from corrosion of the piping.
<Callout type="important" title="Critical Quality Assurance">The use of brass or heavy galvanization prevents contamination, ensuring pure ice.</Callout>
This system is particularly adapted to the freezing of relatively pure water and for use in smaller size plants. The first cost as well as the power cost for operation is less than for medium pressure systems. However, harvesting costs are greater, especially in large plants, and the ice produced always has a thin, white core, unless the cores should be filled with distilled water.
<Callout type="warning" title="Core Quality Concerns">Ice with a thin, white core may not meet quality standards without additional treatment.</Callout>
The illustration below shows excellently the quality of the ice made with this system.
Key Takeaways
- The Frick Low Pressure Raw Water System is efficient for smaller plants due to lower first and operational costs.
- Air compression and cooling are crucial steps in the ice-making process.
- Quality assurance through galvanized or brass fittings prevents contamination.
Practical Tips
- Ensure proper air conditioning before introducing it into the freezing tanks to maintain optimal conditions.
- Regularly inspect and replace any corroded parts to prevent water contamination.
- Consider using distilled water in the core of ice blocks for higher quality standards.
Warnings & Risks
- Be cautious with large-scale operations, as harvesting costs are significantly higher than medium pressure systems.
- Monitor the air valves regularly to ensure they function correctly and do not cause leaks or inefficiencies.
Modern Application
While the Frick Low Pressure Raw Water System is a historical technique, its principles of efficient use of resources and quality assurance can still inform modern survival preparedness. Modern technology has improved efficiency and safety but understanding these foundational methods provides valuable insights.
Frequently Asked Questions
Q: What are the main advantages of using the Frick Low Pressure Raw Water System in smaller plants?
The primary advantages include lower first cost and operational power costs, making it more economical for smaller-scale operations.
Q: How does the air conditioning process work in this system?
Air is compressed to a pressure of two to three pounds by an ordinary rotary, low-pressure blower and then cooled before entering the cans through a shell and tube water-cooled air conditioner.
Q: What measures are taken to prevent contamination in the ice produced by this system?
All fittings and pipes subjected to rusting are either made of brass or heavily galvanized, ensuring that impurities from corrosion do not contaminate the water used for freezing.