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The Tekmar Control Systems T09X Series Snow/Ice Sensor provides reliable snow and ice detection and control for commercial applications. The T090 sensor is designed to be mounted in the T091 socket and sit flush with the slab. The sensor measures the slab temperature, surface temperature and sensor surface moisture level.

609.10 Water Hammer: Building water supply systems where quick-acting valves are installed shall be provided with water hammer arrester(s) to absorb high pressures resulting from the quick closing of these valves. Water hammer arresters shall be approved mechanical devices that comply with ASSE 1010 or PDI-WH 201 and shall be installed as close as possible to quick-closing valves.

Our company Lehry Instrumentation and Valves Pvt Ltd has an experience of 70+ years in the valves industry catering to many manufacturing industries across India. Today we are importers, exporters and manufactures of valves and various other instruments. With our vast experience and knowledge in the industry we aim to become India’s No.1 Manufacturer and supplier.

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Here, the rise in pressure inside the pipeline could be measured using Joukowsky’s Formula. Pressure rise, pr=w*a*v/144g ; where w is specific gravity of liquid, a is velocity of pressure wave in m/s, v is change in flow velocity in m/s, g is gravitational constant.

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As per the example used here, a standard 1/2″ supply line with water flowing at 1.8 m/s can generate a pressure rise of 29 kg/cm2 above the flow pressure itself. The resultant shock wave bounces back and forth within the supply line until it reaches a point of relief in a larger main where the velocity is much slower.

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604.9 Water hammer: The flow velocity of the water distribution system shall be controlled to reduce the possibility of water hammer. A water-hammer arrestor shall be installed where quick-closing valves are utilized. Water-hammer arrestors shall be installed in accordance with the manufacturer’s instructions. Water-hammer arrestors shall conform to ASSE 1010. WATER-HAMMER ARRESTOR. A device utilized to absorb the pressure surge (water hammer) that occurs when water flow is suddenly stopped in a water supply system

The picture shown here illustrates how a Water Hammer Arrestor functions. This simple device can effectively control the undesirable effects of water hammering and is widely being used in the industry. The operations of the WHA can be compared to the working of a shock absorber used in a motorbike.

As the valve is suddenly closed, the flowing water with its energy (as explained with the above formula) hits the valve, bounces back and collides with the approaching stream of water. The collision that happens in the pipeline triggers an enormous pressure spike in the pipeline to create this undesirable noise and shaking, called water hammering. (Think of a train engine applying a sudden brake causing the compartments to collide with each other).

The pressure shock wave, with its energy hits and pushes the piston inside the WHA upwards, compressing the pre-charged air and loses its energy. Once the effect of the peak pressure shock wave is absorbed, the piston gradually returns back to its original rest position. This tendency of the piston inside the water hammer arrestor to revert to its original position is the reason behind the working of a water hammer arrestor.

Wondering why you hear a banging noise in the water supply pipeline? A banging noise in the pipeline can be heard in washrooms when you use a health faucet, a quick closing tap, flush valve, etc.

Here, with the valve in the pipe closed, the pipeline will have a static water flow condition. Hence, kinetic energy = 0

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or P= δp = C*ρ*U ; where C is sonic velocity of the wave front, P change in pressure(δp), ρ is density of liquid, U is change in momentum

When the valve is opened, the water starts flowing in the pipeline. Here, we can measure the kinetic energy of the flowing water by using the formula: KE = (m*v²)/2; where m is mass, v is velocity of the water.