Recent content by Dogberry

Cheers guys, the pipe expander was what I was looking for. The scale was 100mm diameter.

Hi, Is there such a thing as a 'radial jack', i.e. a disc that expands radially when actuated? For example, you could place it in a round hole in an elastic material, actuate it, and it would open up that hole to a greater diameter. Thanks, Ed

Thank you to the both of you!

Thanks ione. As you said, as the pressure increases (20 -> 40bar), Z decreases (Z<1). We can therefore see that the intermolecular attractive forces dominate and increase with the pressure in this range.

Nope Patricia, I'm sorry to say I'm much better qualified than that. Just trying to understand exactly what I'm seeing in some results I've got.

Hey, thanks guys. I guess the only problem is you don't know if the 0.066 is greater or less than ideal, so it's difficult to know whether repulsive or attractive forces are at work. i.e. if 0.066 is greater than ideal and ideal is, say, 0.64, then at 20bar the repulsive forces are greater...

That makes sense, however my friends at (that really reliable source) wikipedia state: "At high pressures molecules are colliding more often. This allows repulsive forces between molecules to have a noticeable effect, making the volume of the real gas (Vreal) greater than the volume of an ideal...

Just read up on latent heat and that makes sense. Thank you.

Cheers - my units should have been dm^3/kg. Does anyone know why this is true for the volume, i.e. a molecular description? Thanks!

Hi, Can someone please explain this to me: Looking at the steam tables, if I have steam at 40bar and 350C then the specific volume is ~66.4 m^3/kg and enthalpy is 3095 kJ/kg. If I halve the pressure to 20bar (still at 350C), thus 'doubling' the specific volume to 138.56 m^3/kg, the enthalpy...

Job done, cheers.

Hi, I was just told to label the parts with numbers, I was invisaging some kind of assembly picture with little numbers on each part, as don said some kind of call outs. Ta, Ed

Hi, I've been asked to label all the parts on my assembly with numbers. Is there anyway of getting solid edge to do this for me, or some other kind of description of the parts? Cheers, Ed

I don't think I mean chains. I mean like a bike brake cable, but with a larger diameter. I might nearly have got it, its just getting the right angles to make it assemble which is the prob. Cheers, Ed.

Looks promising, I'll give it a go anyway, Cheers