Hydrogen Car Fuel Tank: Preventing Permeation & Valve Check

In summary, there are various methods used to prevent the permeation of hydrogen through the valve used to fill a hydrogen-powered car's tank. One common method is using a type of Schrader valve with a ball bearing instead of a center post. However, these valves are not completely foolproof and a secondary manual ball valve may be necessary for added safety. Additionally, some manufacturers use special materials, such as gold or super-alloys, to avoid the negative effects of hydrogen permeation.
  • #1
chemisthypnos
39
11
How do hydrogen powered cars prevent the permeation of hydrogen through the valve used to fill the car's tank with hydrogen? Is a regular check valve used or is the valve special in some way?
 
Engineering news on Phys.org
  • #2
chemisthypnos said:
How do hydrogen powered cars prevent the permeation of hydrogen through the valve used to fill the car's tank with hydrogen? Is a regular check valve used or is the valve special in some way?
That's a design detail that may vary. I can tell you this though; my large neighborhood propane tanks use a type of Schrader valve using a ball bearing instead of a center post. It acts as a check valve, with the pressure and a spring popping it into place as soon as the fill hose is removed. I see no reason why this wouldn't work for H2...

...but these valves are not foolproof and a secondary manual ball valve would be a good idea...though it would also need it's own safety relief valve.
 
  • #3
That is true for most compounds, but hydrogen is very hard to contain as it goes through the walls of most materials through permeation.
 
  • #5
Ok. Thanks everyone.
 

What is a hydrogen car fuel tank?

A hydrogen car fuel tank is a specialized tank that stores and holds hydrogen gas, which is used as a fuel source for hydrogen-powered vehicles.

How does a hydrogen car fuel tank prevent permeation?

A hydrogen car fuel tank is made of materials that are impermeable to hydrogen gas, such as carbon fiber or aluminum. These materials have very low permeability, meaning they do not allow hydrogen molecules to pass through and escape the tank.

Why is preventing permeation important for a hydrogen car fuel tank?

Preventing permeation is important because hydrogen gas is highly flammable and can be dangerous if it leaks out of the fuel tank. By using impermeable materials, the risk of a hydrogen leak is significantly reduced.

What is a valve check in regards to a hydrogen car fuel tank?

A valve check is a safety measure that is built into a hydrogen car fuel tank. It is a one-way valve that allows excess pressure to escape from the tank, but prevents oxygen from entering. This helps to prevent explosions or fires.

How often should a valve check be performed on a hydrogen car fuel tank?

A valve check should be performed regularly, typically every 6-12 months, to ensure that it is functioning properly. It is also important to have the tank inspected by a qualified technician to check for any signs of damage or wear and tear.

Similar threads

Replies
2
Views
281
Replies
2
Views
1K
Replies
8
Views
973
  • Mechanical Engineering
Replies
10
Views
1K
  • General Engineering
Replies
11
Views
2K
Replies
20
Views
1K
Replies
5
Views
1K
  • Mechanical Engineering
Replies
16
Views
2K
  • Mechanical Engineering
Replies
3
Views
855
  • Mechanical Engineering
Replies
6
Views
2K
Back
Top