Hanson Oil Pots has to meet Cal/OSHA Safety Orders Title 8, Article 2, Section# 458 rules for ammonia vessels. This includes at least spot x-ray, .1875″ minimum material thickness and stress relieving the heads before fabrication. Ours are rated for 350# working pressure at -50 degrees F, by post weld stress relieving the entire vessel.Due to recent, significant, volatility in the steel market, a surcharge may apply to the prices

click on the images to enlarge them