Small Vessel Engineering - Compressed Air Systems Quiz

Water Vapour, Particulates, Emulsifications

They can lead to system corrosion, increased wear, and fouling of system filters.

To protect the air side of the compressor in case of water cooling failure and overheating.

<p>Bursting Disc operates to release pressure in the water jacket of water-cooled air compressors.</p> Signup and view all the answers

<p>To prevent overpressure and ensure safe operation.</p> Signup and view all the answers

<p>Water vapour can mix with oil carried over from the compressor, forming a sticky emulsion.</p> Signup and view all the answers

<p>Increased wear and early fouling of system filters.</p> Signup and view all the answers

<p>The fusible plug melts in the event of a machinery space fire, allowing the compressed air to be piped out of the space to prevent the air receiver from rupturing and fueling the fire with oxygen.</p> Signup and view all the answers

<p>At high pressures, the pipes are under stress containing the compressed air. A sudden impact could cause the pipes to rupture and release the compressed air violently, leading to injury or fatality.</p> Signup and view all the answers

<p>Opening valves rapidly can cause a sudden, uncontrolled release of high volumes of compressed air, which is potentially dangerous.</p> Signup and view all the answers

<p>$121^\circ\mathrm{C}$</p> Signup and view all the answers

<p>A bursting disc protects the compressor in the event that a cooling pipe bursts, exposing the cooling water jacket to the full delivery air pressure from the compressor.</p> Signup and view all the answers

<p>If an air receiver ruptures in a machinery space fire, it can provide an enormous amount of oxygen to fuel the fire.</p> Signup and view all the answers

<p>A rapid, uncontrolled release of compressed air can lead to injury or fatality due to the high energy released.</p> Signup and view all the answers

<p>Shock wave travelling down the pipework and resultant slamming of the water can lead to physical failure of valves and pipework joints</p> Signup and view all the answers

<p>To take many turns to open and prevent sudden shocks to the pipework</p> Signup and view all the answers

<p>To provide safety by melting at a specific temperature and releasing pressure</p> Signup and view all the answers

<p>To allow for the removal of moisture and condensate from the system</p> Signup and view all the answers

<p>To alert operators when the pressure drops below a safe level</p> Signup and view all the answers

<p>The relief valve should lift to prevent the maximum accumulation pressure from exceeding the working pressure by more than 10%</p> Signup and view all the answers

<p>To prevent pressure from exceeding safe limits in case all discharge valves are shut and compressors are filling the receiver at maximum efficiency</p> Signup and view all the answers

<p>A fusible plug is specifically designed to protect the air side of a compressor should water cooling fail and the compressor begins to overheat.</p> Signup and view all the answers

<p>A calibrated pressure gauge is essential to determine the stored pressure in the air receiver.</p> Signup and view all the answers

<p>Water can lead to both corrosion and also emulsification (water mixing with oil). Corrosion weakens the receiver strength and can lead to premature failure. Emulsification contaminates the air system.</p> Signup and view all the answers

<p>The manhole door seals from the inside out, using the air pressure inside the receiver to hold the manhole door in the sealed position.</p> Signup and view all the answers

<p>A relief valve is designed to rapidly dump air in the case of overpressure, preventing a potential rupture of the air receiver. It is vented to atmosphere.</p> Signup and view all the answers

<p>Outlet valves should be opened slowly to avoid sudden pressure drops that could lead to condensation forming in the air lines.</p> Signup and view all the answers

<p>The three key pressures are: Test Pressure, Design Pressure, and Working Pressure. The Test Pressure is for factory testing. The Design Pressure is the maximum allowable pressure. The Working Pressure is the recommended operating pressure.</p> Signup and view all the answers

<p>After an overhaul, a relief valve is reset using a calibrated test rig. The adjusting screw alters the compressive force of the spring to set the point where air pressure overcomes the spring to relieve pressure. The lock screw and seal cap ensure this setting is fixed, and the valve is completed with a dated test pressure tag.</p> Signup and view all the answers

<p>It is imperative to set a relief valve accurately because it is a surveyable item, meaning it is subject to inspection and regulation, and it forms a key part of the safety protection system, ensuring that excessive pressure is relieved to prevent hazardous conditions.</p> Signup and view all the answers

<p>If water droplets are carried over with the air through the system, it can lead to further corrosion problems. The water can cause oxidation and degradation of metal components, potentially leading to system failures, leaks, and reduced operational life.</p> Signup and view all the answers

<p>Emulsification is the process where water vapor mixes with oil, creating a sticky emulsion. This emulsion can gum up system components, leading to operational failures further downstream in the compressed air system.</p> Signup and view all the answers

<p>The purpose of a pressure relief valve in the water jacket of a water-cooled air compressor is to relieve excessive pressure in the water jacket, which could potentially cause damage or failure of the compressor if not properly regulated.</p> Signup and view all the answers

<p>A fusible plug is a safety device fitted to an air compressor that melts or fuses at a specific high temperature, allowing the release of pressure and preventing catastrophic failure of the compressor due to overheating.</p> Signup and view all the answers

<p>A bursting disc is a safety device fitted to an air compressor that is designed to rupture or burst at a predetermined high pressure, allowing the release of compressed air and preventing catastrophic failure of the compressor due to excessive pressure buildup.</p> Signup and view all the answers

<p>Three potential consequences of particulate matter being introduced into an air supply system for pneumatic control systems are: 1) Abrasive wear and damage to components, 2) Clogging or blockages in valves and actuators, and 3) Reduced system efficiency and performance.</p> Signup and view all the answers

<p>Accurately setting a pressure relief valve is significant in terms of compliance with regulations and safety standards because relief valves are often surveyable items subject to inspection and must be set correctly to ensure they operate within specified safety limits and prevent hazardous overpressure conditions.</p> Signup and view all the answers

<p>Water vapor, particulates, and emulsifications can have a significant negative impact on the performance and reliability of pneumatic control systems. Water vapor can cause corrosion, particulates can lead to abrasive wear and clogging, and emulsifications can gum up components, all of which can result in reduced efficiency, operational failures, and decreased system lifespan.</p> Signup and view all the answers