General Equipment Flashcards
What is this called?
Clevis pin
In the lifts pictured below, what is the name of the piece these tanks are being lifted by?
Trunnions
What is this a picture of?
The inside of the Vapor Body of a ZLD Evaporator. You can see the internal spray nozzles, mesh, and the tube sheet.
What is this a picture of?
A valve vault
What is this a picture of?
A manway with a davit
A(n) _________________ is a mechanical device that removes dissolved gases, like oxygen and carbon dioxide, from liquids, particularly boiler feedwater
deaerator
Name three (3) important functions of a deaerator used in a thermal power plant?
- Protect steam systems: Deaerators reduce the concentration of corrosive gases in the steam system, which helps prevent corrosion.
- Improve thermal efficiency: Deaerators raise the water temperature, which improves a plant’s thermal efficiency.
- Store feedwater: Deaerators provide storage for feedwater and proper suction conditions for boiler feedwater pumps.
What are the two (2) most common types of deaerators?
Spray-type and tray-type.
Both work by removing dissolved gases like oxygen from boiler feedwater through contact with steam in a counterflow design, with the tray-type being considered more common for most applications due to its efficient gas removal process
What is this a picture of?
A spray-type deaerator
What is this a picture of?
A tray-type deaerator
What is the purpose of an attemperator?
An attemperator controls steam temperature by injecting a spray of very fine water droplets into the steam flow, and these droplets should ideally evaporate immediately. The evaporating liquid reduces the steam temperature, and if the water droplets do not hit the extremely hot pipe walls, the process works well.
What is the distinction between a desuperheater and an attemperator?
A desuperheater and an attemperator essentially perform the same function, which is to reduce the temperature of superheated steam by injecting water into the steam flow, meaning they are largely considered the same thing.
“Desuperheater” is the more general term, while “attemperator” is often used when referring to precise temperature control within a system, particularly near a boiler.
