Since pressure vessels are primarily used to separate liquids from the gases, the liquid outlet nozzle sizes are as crucial as the inlet and outlet nozzles. Also, the PSV nozzle connection must be sized to relieve the flow of fluids if the operating pressure reaches a level higher than the maximum allowable working pressure (MAWP) that the vessel was designed for. They must be calculated separately and considered when determining the overall throughput of a pressure vessel.Īs per ASME Section VIII, the nozzle and pipe diameter cannot be smaller than the inlet connection of the required PSV capacity. It also helps to know that inlet deflectors and diverters adjacent to demister pads and the nozzles upstream of outlet nozzles will have a higher impact on restricting the flow. Internal projection configuration impacts the selection of the discharge coefficient. Actual Mechanical Geometry of the Nozzles.Also, 1.0 to 2.0 m/s is a good starting point for two-phase flow. I made a removable restriction nozzle so I could get my hand in to clear blockages, and for easy replacement as it wears out.It helps to take a standard industry velocity value of 0.5 – 5.0 m/s for liquids and 10 to 20 m/s for gases. The water was only 2 feet deep where I was working, but the old venturi did not have had that sort of power. The result was great, power increase was such that the water and gravel came up the hose with such velocity at high rpm, that it shot right over the sluice box and landed back in the creek 2 feet beyond it! I had to slow it right down to be able to wash the gravel. I will try to load 2 photos showing what I came up with. I used alloy for weight reasons, but also because it was what I had on hand. I lined up the new 3/4 inch jet to be slightly pointing downward but up the center of the pipe - so the water jet would hit the bottom of the pipe about 3 or 4 feet up. Mostly because my hand wouldn't fit up past the nozzle restriction. The old shop bought venturi had worn totally out and was very hard to get jammed rocks out of.
My pump is a 5 hp Honda driving an Onga pump - a factory built pump/motor unit available here in NZ. The last one was four inch and I used a 3/4 inch jet with a flare out to the 1 1/2 inch supply. Hi there, I have made a few suction venturi nozzles over the years, as I couldn't find or couldn't afford store bought.
0 kommentar(er)
