Sounds good to me.

In the case of tubing, you might want to expose the inside only to the chemicals, as this is how I assume it will be used in service. Maybe not for your initial tests. You might consider some type of working pressure test. If you will be transferring fluid at 20 PSI, maybe test at 35-40. Maybe a tensile strength test. (you could use some type of spring scale of the correct size) And if you are doing tensile, you could do compression, too. Don't know enough about your requirements to go further.

I would think some sample size larger than the largest dimension would suffice. (maybe longer for tensile tests)

Have fun.

Thanks for the response. We will be doing sone form of stress crack resitance testing where we will fill only the inside of the tubing. Also, using a pressure transducer, I have characterized the fluid delivery line for discharge pressure at the pump head in a "worst case" scenario. I can use that information for manually setting induced backpressure in the line for the real-time testing we will be doing without having to run hundreds of feet of tubing to simulate. I could possibly add a saftey factor of some kind to the numbers I currently have.

On the real-life project, what is the tubing being used to contain, and at what temperature and pressure?

The tubing is containing a variety of chemistries such as alkali detergents, nuetral detergents, and lubricants. The ambient temperature is 72F and the pressure varies based on discharge conditions and the viscosity of each fluid, which I have tested for as previously mentioned, but to give you an idea, it will range from 2psi to 28psi.