Guys......this thread is typical of Mayhem 
1. the thoughts offered by those who err on the side of safety
2. the comments offered by those who take a diametrically opposed view and suggest that if the manufacturer built it.... it must be OK
...and an obscure Bar [pressure/volume] rating rule may apply
so why worry?
In reality, there is only one accepted stance & that is if an owner of such a device wishes to use the steam assembly in a public environment then the local ruling conditions will apply
I do remember some 50 years ago.....
...the father of a current member building some "a sort of open tray with a perforated screen over the top, fill with meths, chuck a match on and hope you hadn't spilled any"
The only thing was .....
..... that I was not allowed to strike the match.......thanks Dad 
Derek
Derek,
You seam to have missed the point on my comments to Cal on firing his boiler, he was not firing it up in a public place but in his own premises and only to prove
that the safety valve was working properly.
I had missed his post that he had already fired his boiler so it now appears that it is safe enough.
I am not familiar with code of practice in U.S.A but as he is very much on his own there is no reason for him not to experiment on his own premises to become proficient in operating his steam plant.
There is nobody as safety conscious on testing steam plants as I am, as the members of my club can testify when presenting a boiler for testing so don't come up with this diametrically opposed to safety statement that you have quoted
You seam to have double standards in boiler operations as in your post (Quote. 2. the comments offered by those who take a diametrically opposed view and suggest that if the manufacturer built it.... it must be OK

...and an obscure Bar [pressure/volume] rating rule may apply

so why worry? )
When you bought your boiler from Alex on the other side of the world, complete with Test Cert, did you after taking it out of the wrapping have it hydraulic tested before firing it up.
Of course you didn't, as you accepted by trust that the manufacturer had said it was tested and it was O.K. so you had no worries, it's the same with Maccsteam
so what's the difference with say Wilesco, or Mamod ?
It has to be presumed that people using steam plants in model boats should treat them with respect and responsibility and that they are not 3-4year old children operating models in there front parlor without supervision of parents and causing ALLEGED fires that can severely burn the operators, my heart goes out to those that have been burned, burns are very painful, as well I have experienced.
Now as I presume that you will post to my comments please do not use these childish funny faces that you are prone to use as I will not reply to your post if you do.
George.