hydraulics Flashcards
how is a fluid defined
A substance that will readily take the shape of its container
Capable of transmitting power
It can be a liquid or gas
what are the differences between liquid and gas
Liquids are used in hydraulic systems.
Gases are used in pneumatic systems.
what is the formula used in hydraulics
Force = pressure x area
what are the advantages of hydraulics
-Reliable
-Simple and easy to understand
-Infinite speed range
-Easily reversed
-Ability to withstand overload
-No spark risk
-High torque at low speeds
-1/12 size of equivalent electric motor
what are the disadvantages
-Fire risk on mineral oil systems
-Noise
-Risk of contamination
-Less efficient (85-95%)
what is denso tape used for and where is it stored
used on the upper deck to protect hydraulic fittings from the environment
it is stored in the flammable store
what temperature do flourocarbon elastometers melt at and what is the danger
melt at 300 degrees
give of toxic gases like hydrogen flouride
what PPE should you wear when working with fluorocarbon elastomers
PVC gauntlets
Rubber boots
PVC coveralls
Full-face visor
dangers involved with hydraulic fluid
Hydraulic fluids can cause skin irritation.
Change oil soaked clothing immediately.
Any skin irritation/inflammation is to be brought to attention of medical staff.
ALWAYS CONSULT THE HAZARD DATA SHEET.
Mineral oil poses a fire danger, therefore all leaks are to be cleaned up immediately
Flexi hoses are to be in date for test.
Gauge glass valves are to be shut except when in use.
Suitable precautions are to be taken before welding or burning in the vicinity.
uses of hydraulic systems onboard
- steering/control systems
- deck machinery (such as anchor windlass, capstans and winches)
- weapons systems.
- water tight doors
types of hydraulic fluid
- petroleum based
- synthetic based (man made for a specific but expensive)
oils used in hydraulics, there colour and where are they used
- OX30, red, used on submarines
- OM33, orange, used, aircraft carriers
- OX40, green, used on type 45
what is rust veto
put as a substitute to hydraulic fluid to prevent corrosion during upkeep periods
what are the requirements of hydraulic fluid
- transmission of power
- flow easily through lines
- must be as incompressible as possible
- have good lubrication properties
- have good sealing properties
- give up heat readily
what are the oil additives and what are their properties
- Anti Foam - prevents bubbles in oil
- Anti Oxidants - reduce sludge build up
- Anti Corrosion - inhibits rust
- Demulsibility - The ability of a fluid to separate out water
- Pour Point Depressant - Needing the fluid to be able to poor no matter the temperature
