I don't think you need to worry about burst pressure too much here. The reason for the 4:1 ratio is to accommodate an occasional spike in pressure and give you lots of safety cushion, so to speak.
If you use SAE 100R2AT as I mentioned before, the 1/2" size is rated for working pressure up to 3,500 PSI. The minimum burst pressure is four times that, or 14,000 PSI. I seriously doubt your system is going to see pressure spikes that high.
Smaller sizes, like 1/4" and 3/8" are rated even higher.
Because SAE 100R2AT is very common, it is also extremely economical. We sell 1/2" ID for only $1.64 per foot ( $1.56 when you order online at www.DiscountHydraulicHose.com ). Fittings and assembly are slightly more.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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