INVERTED BUCKET TRAPS - HOW IT WORKS, NGUYÊN LÝ HOẠT ĐỘNG BẨY HƠI GẦU

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INVERTED BUCKET TRAPS - HOW IT WORKS

Saturday, Day 31/10/2020

The inverted bucket within the trap will rest on the bottom of the trap body keeping the valve open and allowing condensate to be discharged (Figure A). In the top of the bucket there is a small bleed hole which allows air to escape from inside the bucket and exit through the outlet port (Figure B). When steam arrives through the inlet of the trap, it fills the inverted bucket which makes it buoyant and rise to the top of the trap, closing the valve (Figure C). As steam condenses and/or is bled through the small bleed hole in the top of the bucket, the bucket loses buoyancy which causes it to sink to the bottom of the trap. The valve then opens allowing condensate to be discharged from the system (Figure A). The bucket trap must maintain a certain amount of water (prime) in order to operate. If the trap loses its prime, the bucket will not be able to float when steam enters; keeping the valve in the open position which allows steam to escape (Figure D). Due to the balance of forces required between the incoming pressure and internal trap components, several orifice sizes are required to accommodate various differential pressure ranges. For this reason care must be used to select a trap model with an equal or higher PMO rating than the steam pressure.

	Discharging Condensate With condensate completely filling the trap, the bucket is in the down position with the valve open, allowing condensate to be discharged
	Discharging Air Small amounts of air will pass thru the bleed hole on top of the bucket and be discharged. (Note: Large amounts of air will lift the bucket and close off the trap, temporarily air locking the system.)
	Closed (Trapping Steam) When steam enters the trap, the inverted bucket fills with steam and floats to the surface, closing off the valve, preventing steam from escaping.
	Potential Failure Mode (Loss of Prime) Potential Failure Mode: Bucket traps must maintain a water prime to function properly. If the prime is lost, the bucket will remain in the down position with the valve open, and live steam will be discharged from the system.

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Why we should use Pressure Reducing valve ?

All equipment has a maximum working pressure value, if the working pressure of the equipment is lower than the supply pressure of the system, we need to reduce the system pressure before entering the equipment. In case the pressure reducing valve cannot work, the pressure exceeds the threshold, there will be a safety valve to release the pressure to protect the equipment. For saturated steam systems, most boilers are designed to work at high pressure, usually cannot run at low pressure because the generated steam will be humid, low pressure requires pipes with a large enough size to meet the flowrate. Therefore, the system will operate more efficiently and economically when the steam is generated at high pressure and then reduced before entering the equipment for use. For design calculations, heating applications, from the saturated steam pressure we will deduce the temperature, from which we can choose the appropriate pressure value to calculate the application. Benefits of using saturated steam at low pressure: - Low pressure steam has higher energy than high pressure steam - The amount of flash steam produced will be less, so the energy loss from flash steam will be lower.
WHAT IS BOILER TDS?
EFFECTS OF AIR IN A SATURATED STEAM SYSTEM

EFFECTS OF AIR IN A SATURATED STEAM SYSTEM During operation of the saturated steam system, air flows from outside enter to inside the steam system when the system stops working, from the water supply system, from the vacuum breaker valve. The presence of air in the steam system greatly affects the heat exchange process because air can form an insulating layer on the heat transfer surface, the thermal conductivity of air is 25 times worse than thermal conductivity of water. Therefore, removing air through the THERMOSTATIC AIR VENT is necessary. The THERMOSTATIC AIR VENT needs to be installed in the appropriate location and pay close attention to the most effective air release.
SATURATED STEAM TABLE
Valve leakage