Hello,
If possible, can I get some thoughts on the use of Nitrogen as a motive fluid for the pneumatic positioner on the control valve? The valve is located inside a building that has some air movement. It also has a O2 analyzer for oxygen deficient atmospheres.
Is it really better utilizing...
Hello,
If possible, can I get your thoughts on if it is better to have one big tank of a toxic material onsite or several small tanks??
Is there any process safety guideline (or standard) that can help me with that?
Thanks in advance!
Hello,
our plant has the maximum intended inventory on all the chemicals we have on site (includes vessels, piping, etc.).
I am trying to find out if there is a limit on how many Chlorine railcars we can have on site.
Under Title 40 C.F.R. Part 68 - Chemical Accident Prevention Provisions it...
Hello,
One of our plants has a nitrogen tank that is not padded with nitrogen, it is a in-ground tank.
And similarly, another toluene tank, above ground does have a nitrogen pad.
Are toluene tanks required to have a nitrogen pad to protect against fire potential?
Thank you,
sarah
Hello!
I have some questions regarding the requirements on lifting levers for relief valves as it applies to a project I am working on.
The relief device in question features a packed lifting lever. The devices intent is to protect a positive displacement pump and its piping...
Hello,
We are in the process of designing a system to hold Hexyltrichlorosilane (HTCS), which is a flammable and combustible liquid. Vapors can form explosive mixture with air (it can liberate Hydrogen gases).
The "Safe Handling of Chlorosilanes" indicates that "operational vents from nitrogen...
Hello,
During cold weather conditions we are experiencing freezing on a system that is injected downstream of a toluene line installation. It has gotten too cold and the incoming line freezes at the injection point even so it is heat traced and insulated. (the toluene line is not heat traced and...
Hello,
If possible, can you help me develop a list of topics to include on a best practice document for relief devices? From design, material selection, installation, maintenance...
Thank you,
Hello,
We are in the process of installing a larger tank inside a dike.
The Dyke Containment Structure needs to be extended and or heightened to accommodate the new larger tank installed.
The new installed tank has twice the capacity then the old tank, 500 vs 250 gallons.
We need to make...
Hello,
There is some discrepancy between our tank UBRS and the Tank Data sheet, (both call out no external pressure) but the engineering drawing states -.22 psig.
I was wondering when I would need a tank to be built for the external design pressure of -0.22 psig?
This will most likely rise the...
Hello, we had a large release of TiCl4 at work due to a pipe failure and we were unable to identify the leak for 10 minutes due to fog.
TiCl4 when in contact with air/moinsture releases HCl. I was wondering if somebody would have a suggestion of a suitable HCl monitor I could use for TiCl4 leak...
We were having a discussion here at work regarding the need of a bypass around a PCV.
I have a 3" steam line with a PCV in between but a 6" bypass around it. Picture is attached. This is an old system, installed sometime in the 70s'. The relief valve downstream of this system, was sized based on...
I need to install a PSV in Nitrogen line. A different model relief valve was received (27EA34-120 is flanged) instead of 27EA34-M20, which is threaded.
Would it be okay to install a flanged PSV in nitrogen service?
The company where I work has several relief valves identified as having inlet line losses greater than 3%.
- What kind of engineering analysis can be done to show that the installation will not chatter?
- What guidelines can be used to ensure the installations will not chatter?
Thank You!
Hello,
I received a request to verify if a Farris valve (27DA23-M20), which is currently used in water service can be used in nitrogen service. Would this be possible?
Thank you
Hello,
Would somebody have a way of calculating the TNT (level of explosion) of a substance?
Say I have 100 lb of ammonia, if released, how much of an area would be affected? Is there a way of calculating this?
Thank you!
Dear All,
I am in the process of installing a pressure transmitter on a toluene tank (highly flammable).
A question came up regarding the fact that when opening the 4" nozzle to install the transmitter sparks could develop by something being dropped.
The technicians already use no-spark tools...
I have a relief valve in nitrogen service (line provides a N2 pad to a tank).
what is the difference between a Packed Lever and a Open Lever relief valve? Would that make any difference in my service?
Thanks in advance!
I am in the process of creating a procedure and a checklist that should handle startups after abnormal shutdowns in our chemical plant. I need to have a multidisciplinary team sign off authorizing the startup.
We will consider as "abnormal shutdowns" only those that are historically...
We currently purchase a PTFW Core hoses with double layer & chlorinated Polyethylene (CPE) jacket and sch 80 Monel MNPT fittings.
A question arouse about more cost effective options that lead a vendor to offer a visit today to offer alternate solutions.
What questions do I need to ask in...
