Design Specifications - Heiser Cylinder

[Kobusdan]

I have an old Heiser Cylinder that needs to be hydrotested.

Unfortunately the testing station refuses to test it, as some of the information required in terms of the regulations, are not stamped on the cylinder:
7.3 Where the following information is missing on a pressure receptacle, the pressure receptacle shall be scrapped:
a) design specification;
NOTE Notwithstanding the requirement given in 7.3 (a), in cases where the design specification is not stamped on the cylinder, and the cylinder owner is able to obtain written evidence of the manufacturing design standard from the manufacturer and a copy of the original manufacturing certification for the cylinder(s) in question, then the design standard should be stamped on the cylinder(s) by the approved test station and the cylinder(s) may then be tested.

It is my understanding that there may have been design standard documentation that covered a series of serial numbers. Anybody able to help with the documentation please?

 

[Tanks A Lot]

That's a tough one, as I can't see which market this was made for.

If it was made for the UK it would have fallen under the HOS or HSSS-2. Seeing the age of the cylinder, I presume it must have fallen under the HOS standard, as the HSSS-2 was implemented around 1992.

If it was manufactured for the European market, EN1964-2 would apply.

I unfortunately do not have any Heiser documents for their 200bar variants, but maybe you can satisfy the inspector with something close, although I doubt it.

If the pictures don't trick me, it looks to have a tapered thread and from that time frame I would expect something like a 16T (0.6"), 18T (1") for the European market. 17E and 25E were mostly used later. If that is the case I would think you have a hard time finding suitable valves in the future.

 

[Kobusdan]

That's a tough one, as I can't see which market this was made for.

If it was made for the UK it would have fallen under the HOS or HSSS-2. Seeing the age of the cylinder, I presume it must have fallen under the HOS standard, as the HSSS-2 was implemented around 1992.

If it was manufactured for the European market, EN1964-2 would apply.

I unfortunately do not have any Heiser documents for their 200bar variants, but maybe you can satisfy the inspector with something close, although I doubt it.

If the pictures don't trick me, it looks to have a tapered thread and from that time frame I would expect something like a 16T (0.6"), 18T (1") for the European market. 17E and 25E were mostly used later. If that is the case I would think you have a hard time finding suitable valves in the future.

Thank you for the response.

I unfortunately do not have the history of the cilinder so your guess is probably better than mine. I'm in South Africa but not sure if there was a standard specific to SA at the time, probably made use of UK standards.

You are correct, it is a tapered thread. Present valve still OK but seems the life of the unit is running out fast.

I will hold on to the sheet you provided in case nothing else comes up, thank you.