Purlin span table that covers 4.5m?

[Digmixfill]

I'm hunting around for a span table that will give me some purlin size options for a 4.5m span with purlin spacing at 1.5m, and so far turning up empty.

 

My plans say "existing" for the purlins. I have a mishmash of sizes currently and if I'm going to replace them all I may as well standardise them.

 

The existing purlins for the 4.5m span above are 250x75mm these seem a bit on the svelt side.

 

Anyone have a span table that covers 4.5m?

 

TIA.

Edited May 20, 2023 by Digmixfill

[ETC]

http://www.buildingcontrol-ni.com/assets/pdf/TechnicalBookletD2012.pdf

[Digmixfill]

Thank you very much, that's perfik.

 

2x47x300mm span 4.65m@C16 and 4.85m@C24 at my spacing for the higher weight dead load.