What Does Rising Mains Mean In Construction?
What Does Rising Mains Mean In Construction?
A rising main is a pressurized pipeline system used in construction to transport sewage from one point to another.
It is typically laid in a trench with a minimum of 0.6m of earth cover and should have an even gradient with minimal sharp bends and curves.
The diameter of the rising main should be such that the velocity of the water is kept low, with a speed of up to 1.5 m/sec not being exceeded.
Rising mains are usually used to supply water under mains pressure to a water cistern in the roof.
Gas pockets are of significant concern in rising mains due to their potential for internal corrosion, making it important for utilities to take a risk-based approach when managing them.
How Do You Make A Rising Main?
To install a rising main, the pipe should be laid in a trench with a minimum of 0.6m of earth cover and an even gradient with minimal sharp bends and curves.
A wash-out valve should be inserted in the rising main outside the pump house, with a stop valve or non-return valve immediately downstream of it to prevent wash water from flowing back.
The diameter of the rising main should be such that the velocity of the water is kept low, with a speed of up to 1.5 m/sec not being exceeded.
Prior to installation, joint restraints must be determined by design and typically fitted plus several lengths of pipe on either side.
The pipe should be assembled using come-along or pry bar tools, however it is typically pushed together with excavator at the high point.
Direct tapping is not recommended and instead tap tee should be used for new construction.
The Primus Line® system has been proven suitable for rising mains in numerous installations, including for the City of Gold Coast in Australia and a major UK Utility company for twin sewer rising mains.
This system involves delivering a factory-tested product on a transport reel to the construction site after CCTV surveying and cleaning have been completed.
What Is The Difference Between Rising Main And Gravity Main?
The main difference between a rising main and a gravity main is that a rising main is a pressurized pipeline system, while a gravity main is an unpressurized pipeline system.
A rising main requires the use of pumps to move wastewater from lower to higher elevations, while a gravity main relies on the force of gravity to move wastewater downhill. Additionally, rising mains often contain bends and may have limited or no access into the pipe, while gravity mains are typically straight and have good access at manholes.
Rising mains also require more maintenance than gravity mains due to their pressurized nature.
What Is The Importance Of Rising Main?
A rising main is a type of pipe used for groundwater extraction, specifically in the installation of borewell pumps.
It works by forcing water to rise from the ground below and is available in different sizes and types.
The material of a rising main is an important element as it must be able to withstand corrosion caused by impurities in the water.
Rising mains are an important component of construction, especially for tall buildings, where they are permanently installed with vertical pipes and brigade connections at different levels.
They are also used in wet rising mains, where landing valves are fitted with high-quality regulators to control the water pressure.
When choosing a rising main contractor, it is important to make sure they have experience with both dry and wet rising mains and flexible rising mains, as well as good experience with laying pipes.
It is also recommended to use a mix of polyester fabric and thermoplastic polyurethane for the pipe material as this has high tensile strength and can last longer.
In summary, the importance of rising mains lies in their ability to provide safe and efficient electrical distribution for multi-occupancy buildings such as tower blocks, car parks, and hospitals.
They are also essential components of construction projects that require groundwater extraction.
