Why Gas cylinders and all other high pressure vessels are cylindrical in shape .....?

Why Gas cylinders and all other high pressure vessels are cylindrical in shape ?

Gas cylinders are made in cylindrical shapes , although spherical shape is twice the strength of cylindrical pressure vessel.

But spherical shape cylinders are not preferred because of two main 
reasons  :--

(1.) complex manufacturing procedures
(2.) difficult to transport

Because gas cylinders contain high internal pressure so we cannot use shapes like rectangle and cube  , because there will be many stresses associated with such shapes.

While in case of cylinders , only hoop and longitudinal stresses are present.

Rectangular and cube designs will be more prone to failure at corners due to bending stresses and welding failures.

Now this is why gas cylinders are made cylindrical in shape rather than spherical , cuboidal and rectangular.

FUNCTION OF LUBRICATION AN INTERNAL COMBUSTION ( I.C ) ENGINE

FUNCTION OF LUBRICATION AN INTERNAL COMBUSTION ( I.C ) ENGINE

# NEED FOR LUBRICATION.




In an I.C engine moving parts rub against 

each other causing frictional force.

DUE TO FRICTIONAL FORCE HEAT IS 

GENERATED AND THE ENGINE PARTS 

WEAR EASILY.

POWER IS ALSO LOST DUE TO FRICTION.




TO REDUCE THE POWER LOST AND 

WEAR AND TEAR OF THE MOVING 

PARTS A SUBSTANCE CALLED 

LUBRICANT IS INTRODUCED BETWEEN 

THE RUBBING PARTS OF THE ENGINE.

# FUNCTIONS OF LUBRICATION.

1.) IT REDUCES FRICTION BETWEEN MOVING PARTS.

2.) IT REDUCES WEAR AND TEAR OF MOVING PARTS.

3.) IT MINIMIZES POWER LOSSES DUE TO FRICTION.

4.) WHILE LUBRICATING IT ALSO CARRIES SOME HEAT FROM THE

MOVING PARTS AND DELIVERS IT TO THE SURROUNDINGS
THROUGH THE BOTTOM OF THE ENGINE (CRANK CASE).

5.) IT REDUCES NOISE CREATED BY MOVING PARTS.

6.) IT ACTS AS A CLEANING AGENT.

7.) PROTECT ENGINE PARTS FROM RUSTING.

SPRUNG and UNSPRUNG WEIGHT....WHAT IS IT

SPRUNG and UNSPRUNG WEIGHT....WHAT IS IT ....????????

SPRUNG WEIGHT  :--  Sprung weight is a term used to describe the parts of a car that are supported by the front and rear suspension springs.

For e.g :--  Vehicle's frame , body , engine , driver ,                all liquids and the power train above the wheels.

These are quite heavy assemblies.


UNSPRUNG WEIGHT  :--   The Unsprung weight includes wheels , tyres , brake assemblies , rear axle assembly and other structural members which are not supported by the suspension springs.

We can also say that all parts outboard from suspension springs.



The difference between two is also clear from the image.

WHAT IS A TUBELESS TYRE

WHAT IS A TUBELESS TYRE?

Tubeless tyres are those which do not require a separate inner tube unlike tubed tyres.

Advantages of tubeless tyres are :_

1.)  In case of puncture , the air leakage is very          slower. As the air can leak only through the            point of puncture, it gives sufficient time to the        driver to control the vehicle.

2.)  Better fuel efficiency , because of the light             weight due to the absence of the tube.

3.)  No tube related problems.

4.)  Less chance of damage in case of flat running ,        because no air instant loss.

SADA BIKE or A SPOKELESS FOLD UP BICYCLE

SADA BIKE or A SPOKELESS FOLD UP BICYCLE

A bicycle is great for transportation needs , but it takes up a lot of room inside a home.



In smaller living spaces , bike storage can be a tricky thing to figure out.



As a solution to this problem , Italian designer Gianluca Sada , of Sada bike , has come up with an amazing solution for easy bicycle storage developing a spokeless bicycle that folds up like an umbrella.


;)