Thank you for the response don1980. The PSV valve is a conventional valve. Thus, rated capacity should then be used. Once the rupture disk is gone, then the system will be like stand-alone PSV. The existing valve is too big (i.e. 16 in2, R orifice) and the required is only ~6 in2. This is why...
Hello...I was wondering what relief load (i.e. required or the capacity of the valve) to consider in calculating the inlet and outlet pressure drop for a PSV with a rupture disk upstream of this PSV. As per API, we consider the required relief load for stand-alone rupture disk. I am not sure if...
Oh I see. There is no outlet line. The pellet is lifted until it relieves all the required flow and then reseats back again. The relief goes to the atmosphere. It's weighted relief valve. But I think it's ok now. From the info I gathered, the 3% rule does not apply. Even if I will consider the...
Actually, it starts from the filter nozzle, then 0.5 ft pipe then the PSV valve. So, not sure if that is a pipe away relief vent because it's only 0.5 ft pipe. Thanks!
Thank you. My guess is that they have already taken into consideration the losses when they sized the valve. The loss due to entrance with the required flow is 0.13 psi. The MAWP of the equipment is 1 psig and the set pressure is 0.625 psig. Thus, I believe they already accomodated this drop in...
Thanks Don1980 for the response. The pipe is only 0.5 ft which gives a very small pressure drop. The fitting that gives a very big pressure drop is the entrance from 7ft diameter of the filter to 4 in pipe diameter). Unless the entrance should not be accomodated on pressure drop calculations...
Thanks very much for the response. This is very helpful. I didn't know if the 3% rule applies for this because the vendor gave me a percent blowdown. Yes, I was thinking about the inlet piping being evaluated at the relief valve's capacity. The hydraulics shows a very high pressure drop because...
Hello, I would like to know if the 3% rule still applies for pressure relief vent protecting a tank under code API 2000. I have a filter weigh bin with pressure relief vent set at 0.625 psig (MAWP of equipment is 1psig). As per vendor (i.e. GROTH), this valve opens fully at 100% overpressure...
