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I am looking for some guidelines on how much heat leak is deemed reasonable for a -20°C glycol distribution system via the piping network. The piping network is mainly indoors and ranges from 4" sch. 40 pipe to 1" sch. 40 pipe (carbon steel) and will have 2" of either PIR or cellular glass type...

I'm working on a lab space project that has many HPLCs and the accompanying solvent supply and waste containers. The lab is on the second floor of the building. The amount of solvent associated with the HPLCs is causing an issue with the building occupancy classification and could require the...

Hi everyone, I'm trying to confirm my understanding of how to use spring loaded pressure regulators in parallel. My understanding of how to use regulators in parallel simultaneously, to deliver a flow rate that can't be achieved by one regulator alone, is shown in configuration B. My...

I have to provide 95 psig nitrogen gas to a LN2 dewar switching manifold as the pneumatic actuation gas for the valves that are part of the manifold. The vendor that is supplying this manifold has recommended a high pressure gaseous nitrogen cylinder (size 300) as the nitrogen source since the...

Hi everyone, I'm in the middle of sourcing a 450 gallon 304L IBC (intermediate bulk container) on short notice to meet a fast pace project. In order to get the IBC made quicker, the vendor has presented the option of not removing weld slag to decrease the lead time. I understand slag to be...

I'm working for a client that makes a powdered food product to write up a preliminary dust/powder hazard report for their operations. Unfortunately, the client doesn't have any test data on the powders they used and has stated they aren't able to get data from their suppliers. I was wondering if...

Hi everyone, I was trying to reproduce the result of the 4" condensate line size that users Chemtech2 and 25362 got for the 30 psig back pressure scenario here: thread124-86721 I couldn't find a resource that suggested formulas so I went to the following places: 1)...

Hi everyone, I have a pilot metal system where the burst discs (with a burst indicating strip) of the vessels are joined to a piping network leading to a crash tank via sanitary connections. I am able to perform outboard leak testing using helium on this system and have found that the sanitary...

Hi everyone, I'm looking at a 100 gallon tank wastewater tank (acidic but no solids) that is continuously re-circ'd through a 1" OD PVC pipe and pH adjusted before discharging to the sewer. The pH adjustment is controlled by operators via the DCS (dose in NaOH as needed) and there is an...

Hi everyone, I am designing a small system that will use a 10 gallon plastic carboy as a receiving vessel for IPA that we are using in the process. The source vessel for the IPA is a stainless steel canister (5 gal, filled with 2 gal of IPA) that is rated above 100 psig, though my house N2...

Hi everyone, I am researching ion trapping filters for use in solvent purification for semiconductor applications. I started my search with the current type of ion trapping filter we use on some of our systems (this filter here). The current use is point of use purification when dispensing...

Here is a link to a story about pipeline segments washing up on the shore in England. This is the first story of its kind I've seen. How common is this?

Hi everyone, What do you call the items/assembly used to cover spots on a glass lined vessel where a spark test failure has occurred. They are Teflon/Hastelloy/Tantalum disks that get mounted to the vessel interior to cover the failing area. For the life of me, I can't recall what this assembly...

Hi everyone and sorry in advance for a long post! I will be interviewing for a position with a company in a week and I wanted to get some advice about extra steps I should take given the company's current situation. I am interviewing with Company A for a standard process engineer position...

Hi everyone, I received a spec sheet for a HX on site from back in the early 90s. On the spec sheet was the following item: MTD (CORRECTED) °F 18.57 Is the wording MTD (CORRECTED) the same thing as log mean temperature delta (LMTD)? I have never seen anything but LMTD quoted or discussed...

Hi everyone, My situation is that I have 3 vessels that are all connected to one 2 stage liquid ring vacuum pump (Kinney, further info below) and this pump is used to pull methylene chloride (MeCl) from the batch. We are having performance issues such that the vacuum set points are not achieved...

Hi everyone, To my understanding, a conservation vent can be used on a low pressure tank to provide pressure gradient relief in the case of too much vacuum or too little vacuum but a vacuum break only works to eliminate vacuum after a certain threshold vacuum is reached. Am I missing something...

Hi everyone, I am starting a new position at a company making bulk antibiotic API primarily through crystallization. I now the basics of crystal chemistry and mass transfer from university; could anyone recommend references that deal specifically with crystallizer design/operation? I am looking...

Hi everyone, I have a sump pit (see attachment for details) that drains via a lead lag pumping system. The fluid being pumped out is 90oC WFI (water for injection/very pure water). I am taking the vapor pressure of the water at this temperature to be 526 mmHg. The pit is arranged such that the...

Hi everyone, Just curious if there are any credible scenarios where frictional losses would have to be accounted as a fluid drained out of a vessel. If I imagine an exaggerated case, I am thinking of a highly viscous fluid being gravity drained out of a vertically erected cylindrical storage...