I am evaluating a tube rupture scenario in which both sides contain liquid. There is no vapor or flashing involved with the tube rupture. The tube side is the high pressure side and the maximum operating pressure of ~700 psig exceeds the low-pressure shell side hydrotest pressure of 390 psig...
I'm new to Aspen Plus V8.0. What simulation model (i.e., a separator, heat exchanger, ...) should be used for an isentropic flash (liquid, vapor, two-phase)? What about for an isenthalpic flash? I'm looking for physical properties to model single phase and two-phase flow relief devices. Thanks.
ASME Section VIII, section UG-127 (d)[Open Flow Paths or Vents], states that "Flow paths or vents, open directly or indirectly to the atmosphere, may be used as the sole pressure relieving device on a vessel."
Does a flame arrester meet the intent of this section? Curious how other engineers...
Trying to perform an inlet pressure drop for a steam relief valve (on a utility header). The system is a 3” pressure reducing control valve, which expands to a 6” pipe (for about 1 – 2 ft) which then expands to a 12” steam line. A PSV is located off this 12” steam line via an 8” tee-branch (8”...
Hello.
I have a question concerning Safety Relief Valve coefficients of discharge (Kd). Consider a case where an ASME stamped safety relief valve (for a Sec. VIII, Div. I application) is installed with liquid trim. Assume the conventional safety relief valve has a Kd value of 0.7 for this...
Could someone please provide additional guidance on fusilbe plugs? Per ASHRAE 15-2001
"9.7.2.1 Pressure vessels with an internal gross volume
of 3 ft3 (0.085 m3) or less shall use one or more pressure relief devices or a fusible plug."
I understand that if a pressure vessel is stamped with a...
Hello.
Does anyone have any information concerning breathing rates for the sizing of a free vent or conservation vent for cases where a solid (powder) is dumped from or into a storage tank or hopper. API 2000 provides values in SCFH of air for liquid input/output rates, but I did not find any...
Hello.
I understand that the nameplate capacity of the relief valve (corrected for the fluid at flowing conditions at 10% overpressure) is used to determine the system's inlet and discharge pressure drop to verify the inlet losses do not exceed 3% and the backpressure (superimposed and built-up)...
Hello.
In ASME Sec. VIII, Div. I, Appen. 11, equations are provided to convert the nameplate capacity of a safety valve from one medium to another. You can therefore arrange the equations, for example, to convert a nameplate capacity in SCFM of Air to LB/HR of air. I understand the methodology...
Hello. I have a question concerning the isenthalpic expansion of steam across a control valve (please assume that the pressure drop across the valve would result in a temperature drop and result in dry superheated steam). Say for example the upstream steam temperature was 400°F and the downsteam...
Hello,
I am sizing a relief device for a situation in which a centrifugal pump could overpressure a vessel. Generally speaking, I have seen cent. pump curves that denote the y-axis as Total Developed Head (TDH) and others as differential head. Are these really implying two different values? If a...
Hello all,
I have a question concerning the calculation of relief valve discharge pressure drops. I've tried searching past threads, but I haven't seen any that discuss this particular question. If I've missed it, my apologies.
My question pertains to a conventional spring loaded RV in vapor...
I have a couple related questions concerning relief valve nameplate capacity. I sized a relief valve for nitrogen at relieving conditions of 305°F and 234.7 psia (200 psig + 10% overpressure + 1 atm). Using the API general vapor sizing equation for critical vapor flow, I came up with a rated...
Hello. I am a process engineer (fairly new on the job) and I had a question pertaining to a free vent. The vessel in question is a plastic tank (HDPE) and falls under the API 650 standards. The tank is rated for 0 pisg at 100°F. Does anyone know where it states in API 650 (or another standard)...
