Basic Systems Flashcards
(37 cards)
Define a system?
A series of interconnecting pipes and components that will deliver a substance from one point to another.
Define an open loop system
The working fluid is consumed e.g. fuel, domestic fresh water
Defined a closed loop system
The working fluid is reused e.g. lub oil system, fresh water cooling system
What is a header tank for?
Reservoir to top up a system
What is a service tank for?
Supply of clean, water free fuel
What is a drain tank for?
Collects oil returning from a system
What is a contents gauge for?
(clock/dial) how much fluid is in a tank
What is a gauge glass for?
Visual indication to tank level (push button to read)
What is a sounding tube for?
Used to measure depth of liquid in a tank (dip tape)
What is the purpose of a strainer?
To remove large coarse particles, usually metal plates with holes in
What does the type of pipework used depend on?
Service being supplied (fluid)
Operating temperatures and pressures
Other types of material used within the system
What is phosphor bronze used for?
High pressure salt water
What is copper used for?
Domestic fresh water
What is copper nickel used for?
Lub oil
What is brass used for?
Castings (valves, couplings, junctions, taps)
What is plastic used for?
Sewage/waste systems and pre wet
What does the type of seal used depend on?
System pressure
The fluid being used
The temperatures involved
Examples of gaskets?
NAF Paper Leather Cork Copper Rubber
What is a mechanical seal used on?
Rotating components such as pump shafts
Keeler ring couplings are used on …
High pressure pipework connections
Gland packing is…
Silicone, wool or wax depending on fluid type, pressure and temperature
The purpose of a valve is…
To provide a method of controlling flow or pressure of a fluid (liquid or gas) or to provide a means of isolating (shutting off) various systems or components.
Name types of valves
Globe valve
Gate valve
Flap valve
Saunders valve
Ball seated cock
Relief valve-prevents overpressurisation
Reducing valve-reduces pressure for part of a system
Non return valve-prevents reverse flow
Pressure control valve-maintains pressure at a set level, monitors the outlet pressure
ROV- remote operation valve - rod gearing or automated
Define a positive placement pump
Less flow, increases pressure e.g. gearwheel pump, rotary pump
