Hello, I am looking to specify a DAF unit for process waste water treatment from an organic chemical process.
I would like to make inquiries with well known and trusted vendors, preferably ones that also offer lab/pilot evaluation services.
Could I get recommendations from this forum?
An...
This is my first time coming across these types of baffles in a heat exchanger. The service is cooling water (cold) & oily water (hot) in a 3 pass shell and 3 pass tube exchanger. One benefit that I can see is the reduced pressure drop on the shell side due to the non-segmented nature of the...
Hello, I am looking for an inline oil in water analyzer for an effluent stream to alarm on possible spill conditions. Typical oil content is 500-2000 ppm. I have received some information from Analytical Systems Keco for a continuous type of analyzer, and it looks promising. Does anyone have...
Hello,
I would like to size a N2 purge to clear a 3" diameter line, 500 ft in length. The material that I am trying to push out of the line is a molten rosin. Viscosity is 15 cP, and will solidify at ambient temperatures. This line is steam traced, but the preferred practice it to blow this...
Hello,
I am evaluating the flow regime of a 3" line that handles a 2 phase mixture. Aspen Plus predicts slug flow in the 3" line when I reach my destination pressure. The vapor volume fraction is 87% and the mixture velocity is 48 ft/sec at the end of the line. When I increase this line to 6"...
Hello,
I have a project that will be hanging a new heat exchanger off of a distillation tower. I've attached some structural drawings to give an idea, realizing that this isn't complete detail for an in depth analysis. The nozzle projection from the tower has changed and will move away from the...
thread124-420364
Hello, this question is related to my previous post above. For the buffer tank that has a dip pipe on the liquid fill line and a vent to a vacuum tower, what is the consequence of not sealing the dip pipe? I would imagine gas being drawn back to the tower via both the vent and...
Hello, I have a new reboiler that will be going into service in a few months. The tube side is AL6XN and is in oil service (pH=5), the shell side is 316L and is in Dowtherm A service.
I have heard of pickling exchangers before, but do not know when it should be applied.
Are there some...
thread1452-317354
Hello, I have a copy of this standard and was not clear on if it should be applied to fixed roof tanks as well with regards to the circulation vent requirements. I have several fixed roof tanks on site that have these vents. The fabrication drawings reference API 650 as the...
Hello,
I have a project to install a new storage tank. A question came up regarding the basis of several vents that are installed on existing tanks in the same service. The existing tanks have 12 vents installed all around the circumference of the roof. It was mentioned that these vents are to...
Hello, This was inspired by the recent thread on series vs parallel pumps.
I would like to understand in general terms when to worry about 2 pumps discharging into a common header fighting with each other?
If the two pumps and associated piping are identical, then they back up to the same...
Hello, I am trying to understand if the expansion joint for a new heat exchanger is being installed in the right location. I've attached a picture showing two supports that will be connected to the green structure above by hanger rods. The expansion joint on the shell of the exchanger is between...
Hello, I am trying to understand if the expansion joint for a new heat exchanger is being installed in the right location. I've attached a picture showing two supports that will be connected to the green structure above by hanger rods. The expansion joint on the shell of the exchanger is between...
Hello, I have a project that will be installing a set of centrifugal booster pumps in the middle of a feed train. These pumps will take suction from the first set of pumps after the fluid goes through several heat exchangers. My question pertains to the start up sequence of the new booster...
Hello,
I am reviewing a proposal to replace a 16" diameter nozzle with a 20" nozzle on a distillation column. The column has a carbon steel outer shell 39/64" thick, 316 SS clad liner 5/64" thick and then 904L strip lining 10 GA thickness. They are proposing to provide a carbon steel nozzle...
Hello, I am looking to size a relief valve for a case where we contaminate an organic feed with water. This feed would flow through several heat exchangers until it reaches the bubble point of water. Would this be calculated by simply taking the latent heat of vaporization of water at relief...
Hello,
I am currently working with a vendor on a design for a shell and tube heat exchanger. I have completed a design using Aspen EDR, and submitted a specification sheet based on that design for bids. One of the vendors has commented that my design is undersurfaced for the specified duty...
Hello,
I am currently evaluating options to stabilize a sidestream draw off of a vacuum distillation tower. The sidestream gravity drains to a buffer tank before being pumped to the next unit. The engineering firm has proposed to increase the residence time at the draw sump inside the column by...
I have a heat exchanger with Dowtherm A vapor on the shell side in condensing service. This is part of a closed heat transfer system with a fired heater maintaining the supply temperature and pressure. The outlet pressure increases over time on the return side of the Dow system. Is this any...
