Ideally each unit process should have its own P&ID. [however, occasionally more than one drawing may be needed so it is not too congested.] A key consideration is how you intend to organize the numbering for the equipment and instrumentation. A systematic numbering system is important, and...
The primary issue is that at the point that the discharge line's pressure drop exceeds about 10% of set point (8 psi) a conventional valve will close. It will then reopen as soon as the backpressure descreases, and so on. This rapid and possibly violent opening and closing can damage and...
The water quality must be based on the tolerance that the analytical tests have for the contaminants that are found in water. Your chemists will need to provide you those guidelines based on the type of testing they will perform and the required accuracies etc. The information on the web site...
I agree with previous to use 316L. The cost difference is minor, overall. Not clear from your question if these parts are in contact with product/process, or external. If in contact, product quality drives material and finish, and may require some degree of polish. Electropolish would only...
I’d like to understand why high purity waters apparently cause high corrosion rates of carbon steel at room temperatures. Is the higher corrosion rate really due to their low ion content, & therefore higher dissolution driving force (ie hungry water explanation)? Is the rate for pure water...
I interpret your question as: you would like to know what is the lowest flow rate that would be typically found in typical industrial pipes, for insight into what flows your “device” may encounter. If my interpretation is correct, then:
A "usual" range would be 5 to 8 fps, with velocities...
I would also recommend against a flame arrestor on the relief discharge line. With proper location and position of the discharge point, it should not be required.
I'm not sure why they would be questioning pressure relief for the tanks, "since the area is surrounded by a corridor" Sounds more...
Since most of the temperature rise is due to the addition of the pump energy, you may want to look at the loop hydraulics to see if you can reduce the flow rate, or the pressure drop. If you can, then you can reduce the pumping power by using a smaller impeller or by using a VFD on the pump...
In ASME Section VIII (one of ) the criteria that determines is a vessel is covered in the code is if the “operating pressure” is 15 psig or higher. There are some cases where the codes definition of “operating pressure” is not clear to me. Maybe best using a hypothetical: Let’s presume...
Since your tank is rated for full vacuum there is no reason to use a disk to protect the tank against vacuum.
Not sure what kind of "hot water tanks" were being referenced in the article you read.
Your vent filter should be properly sized to ensure that enough air can come through...
I don't know anything about your system, but for many pure water systems the reason that the system temperature is increasing is due to the heat input from the recirculation pumps. Almost all the brake horsepower of your pumps is converted to heating the water (for recirculating systems)...
The best approach is to eliminate the open overflow and provide a sanitary rupture disk on the top of tank with a discharge line to the floor/drain. This will prevent overfilling, or overpressure due to any problem. A high level switch will still help avoid high level problems and prevent the...
I would agree that the best approach is to look for the source of the hammer. A VFD on the pump(s) could be used to ramp up and ramp down may help. Slow (slower) closing valve actuators might help. Any chance that vaporization is occurring (and collapsing) in some part of the line?
The only...
PauloRibeiro is correct that if the system is stainless steel, then it must be passivated prior to sanitization, as I stated. The actual water spec for your “high purity” system may impact what really needs to be done. Stainless steel high purity water systems would normally use stainless...
