Test Your Understanding Regarding Jets Vacuum Piping System

The statement is true. In a toilet piping system, the vacuum level should be maintained at 40-55% in the idle position. This ensures proper functioning of the system by preventing any blockages or backflow of waste. Maintaining the correct vacuum level helps in efficient flushing and disposal of waste in the toilet system.

In a vacuum toilet system, the difference in air pressure is indeed used to transport sewage from toilets to a vacuum generating unit. This system relies on creating a lower pressure in the waste pipe compared to the surrounding atmosphere, causing the waste to be sucked into the vacuum system for disposal. Therefore, the statement is true.

The vacuum generating unit should be located at the lowest point in a vacuum system. This is because the vacuum generating unit creates the necessary suction to remove waste from the toilets and transport it through the system. Placing it at the lowest point allows for efficient removal of waste and prevents any potential blockages or backups in the system.

Sewage and water are collected in the transport pockets of the piping system between flushes. This means that when a toilet is flushed, the sewage and water flow through the pipes and are stored in small pockets within the piping system until the next flush. This allows for the effective transport of sewage and water through the plumbing system.

When a vacuum toilet is flushed, it creates a suction force that reduces the vacuum level in the piping system. This decrease in vacuum level triggers the vacuum generating unit to start re-building the vacuum level by removing air from the system. Therefore, the correct answer is that the vacuum level in the piping system will decrease and the vacuum generating unit will start to re-build the vacuum level.

When installing a vacuum piping system in a ship with a total pipe volume of less than 160 litres, it is important to consider installing a vacuum accumulating tank. This tank helps to collect and store the vacuum pressure, ensuring a consistent and reliable vacuum supply throughout the system. Without the tank, the system may experience fluctuations in vacuum pressure, leading to inefficiencies and potential malfunctions. Therefore, installing a vacuum accumulating tank is crucial for maintaining a stable and efficient vacuum piping system in this scenario.

The expression "Backflow" refers to the situation where sewage from upper pipes flows in the opposite direction, back into the rising pipe that is connected to the toilet. This can occur when there is a reversal of the normal flow due to a change in pressure or a malfunction in the plumbing system.

When installing a vacuum piping system, the size of the ship and the risk of varying trim and list of the ship should be considered. This is because the size of the ship will determine the size and capacity of the piping system needed. Additionally, the risk of varying trim and list of the ship is important to consider as it can affect the proper functioning and efficiency of the vacuum system.

A "rodding point" refers to a specific location in a vacuum piping system that allows for easy access to the piping in order to clean it. This point is designed to facilitate maintenance and ensure that the system remains free from any blockages or obstructions.

The correct answer is Vacuum generating unit + piping system for transport of sewage + toilets, urinals, grey water interface units. This answer accurately identifies the three main elements of a Jets vacuum toilet system, which are the vacuum generating unit, the piping system for transporting sewage, and the toilets, urinals, and grey water interface units. These elements work together to create a vacuum pressure that efficiently transports waste and grey water from the toilets and urinals to the sewage system.

Transport pockets should be installed in a vacuum piping system to re-form slugs and secure the speed of sewage transport in the piping. Slugs are large volumes of sewage that are transported through the vacuum system. By re-forming slugs, the system ensures that the sewage is transported efficiently and quickly, preventing any blockages or delays in the system. This helps maintain the overall speed and effectiveness of the sewage transport process.

The correct answer is 5 to 15 meters. When a toilet is flushed, the sewage is pushed through the piping system by the force of the water. This force allows the sewage to travel a certain distance before it reaches a point where it needs to be collected or treated, such as a sewage treatment plant (STP) or a collecting tank. The distance that the sewage can travel depends on factors such as the size and slope of the pipes, the water pressure, and any obstacles or bends in the system.

Each time the toilet is flushed, the vacuum piping system sucks in a significant amount of air to create the necessary pressure for the flushing process. This air is then used to propel the waste and water out of the toilet bowl and into the sewage system. The amount of air sucked in for each flush is estimated to be between 60-80 litres.