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[steam up]

Read section 2:4 this does not effect commercial tanks regarding the hydraulic test.

[Steve Dean]

It does seem to be from section 2.4 regarding gas tanks that we have the situation whereby someone building their own gas tank will need to have their boiler inspector perform a hydraulic test to 400 PSI. However commercial gas tanks, some of which are only tested to 120 PSI, will be ok to use.
Logically therefore, when a commercial gas tank is due for retest after 5 years, it will only be tested to its original test pressure.
This also means we will have a situation with gas tanks in use, all tested to different pressure and no consistancy.
This seems to be a somewhat strange outcome. I'm sure there will be further comments on this. 

[steam up]

Always the issue when rules are drawn up by commity looks to me like a pigs breakfast and I've looked at it for ten minutes lol

[Mark T]

It does seem to be from section 2.4 regarding gas tanks that we have the situation whereby someone building their own gas tank will need to have their boiler inspector perform a hydraulic test to 400 PSI. However commercial gas tanks, some of which are only tested to 120 PSI, will be ok to use.
Logically therefore, when a commercial gas tank is due for retest after 5 years, it will only be tested to its original test pressure.
This also means we will have a situation with gas tanks in use, all tested to different pressure and no consistancy.
This seems to be a somewhat strange outcome. I'm sure there will be further comments on this.

Hi Steve thanks for the information.  As a newcomer to steam I find this situation a bit perplexing.  If the new Orange book has not yet gone to print I would hope that the committee would accept that there is a inconsistency here and look again at the regs.  Surely all gas tanks should conform to one standard; otherwise people like me will just not understand decisions made regarding our hobby?

[steam up]

Welcome the the world of model engineering. It's beyond me why the test has been set at 400psi  anybody who has run a gas tank in a boat will tell you that the biggest problem is a drop in pressure has the gas tank freezers due to evaporation

[Albert Uncle]

1.7 

The provisions of this Test Code shall come into effect on 1st May 2018 and shall not be retrospective.

[Marc St Hilaire 60]

Interesting thread.

Recently I have built two 1/12 scale narrow boats, both electric powered. I've just starting a third, based on a Birmingham Canal Navigation (BCN) type tug and was thinking of having it steam powered. Having read the above, I'm wondering if I need the grief!

Based on a 50 inch length and a displacement of about 25lbs, I assume my steam plant will not fall under the 3 bar/Litre exemption?

[steam up]

Not really that would fall below the 3 bar litre rule for the required power

[Marc St Hilaire 60]

Thanks for that. I'll carry on building.