Dear Colleagues,
Per ASME Section VIII, M-6, the inlet pressure losses will be based on the valve nameplate capacity corrected for the characteristics of the flowing fluid. Are there any exceptions to this requirement spelled out in ASME VIII? In other words, does ASME Section VIII also...
Dear Colleagues,
When designing and constructing a new tank, who is generally responsible to develop/provide a strapping or capacity table? Is this a responsibility of a tank manufacturer or a customer once the tank is turned over from a contractor to a customer? Appreciate your feedback.
Dear Colleagues,
I have a heat exchanger that heats up the process fluid with steam. The duty is controlled by adjusting steam side pressure. The condensate is gravity drained from the exchanger and routed to the condesate system via a steam trap. This exchanger is getting replaced with a...
Dear Colleagues,
For atmospheric storage tanks, I have heard that in general, all tank nozzles (except those on a roof) should have valves located at the tank nozzles. I have checked API guidelines, but was not able to find any explanation to why the valves need to be located at the tank...
Dear Colleagues,
When the required body size of a control valve is lower than the inlet and outlet line sizes, inlet reducer and outlet expander are normally provided. Under what circumstances do we use eccentric reducer/expander? Likewise, under what circumstances do we use concentric...
Dear Colleagues,
When the required body size of a control valve is lower than the inlet and outlet line size, inlet reducer and outlet expander are normally provided. Under what circumstances do we use eccentric reducer/expander? Likewise, under what circumstances do we use concentric...
Dear Collegues,
Will there be any issues for allowing high pockets on pump suction line provided that:
1) fluid is heavy hydrocarbon - no flashing at high points
2) NPSH_available is greater than NPSH_required
Your feedbacks will be greatly appreciated.
Dear Collegues,
For vapor filled vessels/reactors, API standards have some guidelines regarding how fast it should empty 50% of equipment inventory (15 minutes to get rid of 50% or something like that). For liquid filled vessels/reactors, I have not been able to find any depressuring...
Dear collegues,
In ejector design, velocity (kinetic energy) is converted into pressure (potential energy). In terms of energy conservation, this perfectly makes sense. But mathematically, this seems quite difficult to grasp... at least for me. For example, let us assume that the equipment...
Folks,
I was doing some research on the gate valve bonnet vent system, and I came across the following from the US Department of Energy standards (DOE-HDBK-1018/2-93).
"Some parallel disk gate valves used in high pressure systems are made with an integral Figure 8 Parallel Disk Gate Valve...
Folks,
I understand that a percentage of the process fluid will recirculate at the eye of impeller and the percentage increases as flow drops. Heat build up due to this recirculation can potentially cause flashing, and hence cavitation as fluid velocity turns into pressure.
I also heard about...
Does anyone know the solar absorptivity of Fiberglass Reinforced Plastic (FRP) tank constructed with vinyl ester resin? I am trying to calculate the amount of heat gain and subsequent temperature rise of the material in the FRP tank during summer. The material is Sodium Hypochlorite, which...
Are there any design codes or regulations that allow the maximum pump casing pressure to be within 110% of the casing design pressure? ASME Code Section VIII addresses 10% overpressure allowance for a pressure vessel, but it is only applicable to a vessel with a overpressure protection device...
Are there any design codes or regulations that allow the maximum pump casing pressure to be within 110% of the casing design pressure? ASME Code Section VIII addresses 10% overpressure allowance for a pressure vessel, but it is only applicable to a vessel with a overpressure protection device...
Please pardon my ignorance.
But can anyone please explain to me why critical pressure and temperature data are required to size the control valve? Thanks!!
I have never designed a plate & frame exchanger.
With that said, can anyone tell me approximate size of a plate & frame exchanger with 40,000 ft^2 surface area assuming one pass design? I am in process of contacting a exchanger vendor...
Appreciate any feedbacks.
I am currently screening a project to circulate heat transfer fluid (Dowtherm HT) to a fired heater for heat recovery purpose. The skin temperature of the exchanger is ~ 200 DegF less than the auto-ignition temperature of the Dowtherm HT. On paper, it does not appear to cause any fire issues...
A core-in-kettle exchanger performance has been declining over time. The suspected root cause is deposition of elemental sulfur in kettle side of the exchanger. This fouling mechanism has been verified, and the exchanger is being planned to be isolated, cleared, and cleaned in near future...
