Chapter 2 Flashcards
What is a Safety Valve?
An automatic, full-opening, pop-action valve that is opened by overpressure in a boiler to relieve pressure before damage occurs.
What is chattering in the context of safety valves?
The rapid opening and closing of the safety valves.
What does Safety Valve capacity refer to?
The amount of steam, in lb/hr, that the safety valve is capable of venting at the rated pressure of the safety valve.
What is total force in relation to safety valves?
The total amount of force in pounds acting against the safety valve disc.
Fill in the blank: Safety Valve is opened by _______ in a boiler.
overpressure
True or False: Safety valves are designed to prevent underpressure in a boiler.
False
What is a Huddling Chamber?
A recessed area in the Safety Value disc that increases the Surface area and total force applied when the Valve opens.
The Huddling Chamber enhances the efficiency of the safety valve.
What does the term ‘Blow back’ refer to?
The drop in pressure in the boiler that occurs after the Safety valve has opened.
Blow back is a critical concept in understanding boiler safety and operation.
Define Safety Relief Valve.
A specially designed automatic valve that can be used as a safety valve or as a relief valve, depending on the application.
Safety Relief Valves are essential for preventing overpressure situations.
What is a Try lever test?
A safety valve test performed by lifting the safety valve try lever.
This test ensures the valve functions correctly.
How often should a Try lever test be conducted?
Every 30 days the boiler is in operation and after any period of inactivity.
Regular testing is crucial for maintaining boiler safety.
What is a Pop Test?
A safety valve test performed to determine if a safety valve opens at the proper pressure within allowable tolerances.
Ensuring the valve opens at the correct pressure is vital for safe operation.
How often should a Pop Test be conducted?
Annually, preferably at the beginning of the heating season.
This timing helps ensure the valve is ready for the heating demands.
What is a Steam Pressure Gauge?
A boiler fitting that displays the amount of pressure in PSI inside a boiler.
Define Hydrostatic Pressure.
The weight of water.
What is a Bourdon Tube?
An over tube shaped like a question mark that has a tendency to straighten when pressurized.
What is the purpose of a Siphon?
To provide a water seal between the boiler and a boiler fitting to prevent contact with steam.
What does a Vacuum Gauge indicate?
The amount of vacuum present in the boiler.
What is Vacuum?
Pressure below atmospheric pressure.
What is a Compound Gauge?
A pressure gauge that indicates vacuum in inches of mercury and pressure in PSI on the same gauge.
Define Transducer.
A device that receives a signal representing a variable and converts that signal into an electrical or digital signal compatible with a digital control system.
Fill in the blank: A _______ is a boiler fitting that displays the amount of pressure in PSI inside a boiler.
Steam Pressure Gauge
Fill in the blank: A _______ is an over tube shaped like a question mark that has a tendency to straighten when pressurized.
Bourdon Tube
Fill in the blank: A _______ is a pressure gauge typically used to indicate the amount of vacuum present in the boiler.
Vacuum Gauge
True or False: A Siphon prevents contact with steam.
True
What is a transmitter?
A device that sends a signal to a controller, such as a programmable logic controller or other digital controller.
What is a fast gauge?
A malfunctioning pressure gauge that indicates more pressure than is actually present.
What is a slow gauge?
A malfunctioning pressure gauge that indicates less pressure than is actually present.
What is a water column?
A boiler fitting that reduces the turbulence of boiler water to provide an accurate water level in the gauge glass.
What is gauge glass?
A tubular glass column that indicates the water level in the boiler.
What is a boiler cross-tee?
A pipe fitting with removable plugs that allow for cleaning and inspecting of piping.
What is blow down?
The process of evacuating water and undesirable accumulated material.
