ETG01,
The link to the API 521 interpretation that you provided appears to suggest that a shutdown valve together with a check valve in series is adequate protection for backflow. Is that your interpretation?
For clarity the shutdown valve on the discharge of the compressor is driven shut by...
Brainstorming,
I do not believe that the "0.7 x Sonic Velocity" requirement is a manditory code requirement. However, it is common practice to limit tail pipe velocities to this figure for two reasons:
- Firstly and most importantly, at velocities above 0.7 x sonic velocity there is a risk...
EGT01,
Thanks for your concise and professional input, it is appreciated. I am familiar with the paragraph in API 521 that you are referring to.
Just to clarify, in my particular situation for backflow to occur there needs to be a failure of both the shutdown valve (a fail closed ball valve)...
Automated shutdown valves are often installed on the cooling water supply and return lines of shell and tube exchangers for the simple reason that they limit the migration of hydrocarbon vapor into the cooling water system in the event of a tube rupture. Obviously the impact on plant safety has...
P&ID development is not something that is easily learnt from books. It takes training and a good deal of experience. I suggest that you employ a competant Process Plant Contracting company to help you.
PSVs do not have to be directly flanged to the vessel being protected. In fact this is rarely done given the general requirement that PSVs have to discharge to a flare system.
I'd give the following advice on layout and design of piping
- The PSV tail pipe should fall all the way towards...
The compressors are centrifugal. The HAZOP report did not recommend any additional protection from reverse flow other than the existing non slam check valve.
byrdj thanks for your great answer. Just to make sure I'm following you. The gas generator will operate at basically constant speed? If that is true then the air flowrate (mass basis) drawn into the compressor will basically be constant. The only variable that can therefore be adjusted to...
When plant containing pressurised gases and liquids is blowndown (depressurised), the depressurisation can cause piping and vessels to become chilled. The temperature within the plant drops as the pressure drops and the minimum vessel and piping temperatures coincide with the minimum internal...
How is the output power of a turbine generator controlled?
Please explain the entire system including reference to
- Control of the gas generator and power turbine
- The control of the fuel\heat rate
- How the electrical output of the generator is controlled
My understanding is pretty basic...
How is the output power of a turbine generator controlled?
Please explain the entire system including reference to
- Control of the gas generator and power turbine
- The control of the fuel\heat rate
- How the electrical output of the generator is controlled
My understanding is pretty basic...
What constitutes lateral support to prevent lateral torsional buckling in steel I-Section beams?
For example, is it adequate to provide transverse stringers connected to the compression flanges of parallel beams, i.e. to provide a grid structure? If that is acceptable I presume that you...
What constitutes lateral support to prevent lateral torsional buckling in steel I-Section beams?
For example, is it adequate to provide transverse stringers connected to the compression flanges of parallel beams, i.e. to provide a grid structure? If that is acceptable I presume that you...
Not sure I completely understand your question but it sounds like you intend to keep one of the "old" pumps as a standby? It sounds like the head provided by the "old" pump will be so high that controlling with the "new" level control valves will be difficult or impractical?
If all of the...
I should also have stated that the incoming crude oil will have a BS&W of between 5-10%. Bulk oil & water separation is carried out in an upstream three phase separator.
I am interested in opinions regarding the practicality of dehydrating a sweet light (40 API) crude oil to a BS&W content of 0.5% using a horizontal three-phase separator fitted with high efficiency coalescing media. The emulsion forming tendency of the crude is very favorable. The crude...
In many countries the law does not prescribe the processes, systems or work methods that must be applied. However, as an engineer you will likely be judged on whether or not you applied reasonable judgement. That is, did you take all of the steps that could be reasonably expected to ensure...
HETP is not a fixed quantity soley related to the type and size of packing used. It is a function of the physical properties of the fluids and their flowrates\velocities through the packing. Unless you used estimates based on towers in the same service operating under similar conditions then...
