Folks,
I would like some input on correctly assigning a tag for a DCS alarm point that is associated with a bypass switch.
I have a manual bypass switch, that when placed in bypass position will be a discrete input to a PLC. I am tagging the bypass switch "HS".
When that one switch is placed...
I have an application that includes a horizontal pipe with orifice flanges in a piperack that is about 15 feet in the air. The product is an Offgas and we need the transmitter mounted at grade, which is against the norm of mounting transmitters in gas service above the process taps.
Would this...
All,
I am presented with the task of adding (3) 2" nozzles to an existing coded vessel (ASME Section VIII). The vessel is a Flash Drum in a Crude Unit - Design P&T 48PSI @ 650degF. I am unfamiliar with the process and would like to know the correct procedure to do this.
These new nozzles...
Hi folks,
Would like some comments on installing a VRLA (valve regulated lead acid) battery in an explosion proof enclosure that will be installed outdoors. The area is Class I Div 2 Group D.
Originally planned to install in a louvered battery box.
Client questioned classification of battery...
Thanks pennpiper. I was on the fence with this and your guidance helped tremendously. I will go with the pipe shoes on steel as discussed.
Sincerely!!!!
One end will be flanges on a skid that is being prefabricated and delivered. The skid is basically two 2" control valves in parallel in a symmetrical horizontal configuration. The outlet of each control station comes together and leaves the skid in a single 3". The piping on the skid will be...
Hi Folks,
I'd like to know if you can share your opinions with me on some basic pipe support questions?
Summary:
Will be running a few 2" and 3" CS pipes with max 450 deg F (hot insulated - 2" calcium silicate). Spec calls for 2" to be socketweld and 3" to be buttweld. Route of each is...
Folks,
I am seeing instances on P&ID's where people are using "UT" to, I think, represent a multivariable transmitter. For example Honeywell SMA125 provides MV transmitter that requires a temperature input and it outputs flow, pressure, temperature and compensated flow. This seems like a...
Thanks for the feedback. I too was thinking of looking at a LOPA without the ESD's to see whether the node "required" the ESD, which in my understanding would mean its purpose is for risk reduction and therefore would make it fall under ISA84.
You agree?
On a related note, what if we consider...
We will soon be going throughout our facility to determine whether our safety systems are ISA84 compliant and I would like to get some of your thoughts on what they audit process should consist of.
1) I suppose the first thing is to make sure we can identify which items fall under ISA84. I put...
Are there instances where codes call for ESD's just because it is good safe practice as opposed to ESD's that are installed to reduce risk to a quantified level?
If so, can you provide your insight on the differences between standard ESDs for code and ESDs for specific risk reduction?
We have...
I need to get sample gas from a Hot Oil Heater stack and would like advice determining how fast the gas cools after it leaves its source.
The 20 burner (fuel gas) heater has stack gas about 750 deg F at the elevation I need to sample. I intend to use an existing 4" nozzle and attach a 4" to 3"...
To all-
I am adding 4 - 24VDC power supplies (Pheonix QUINT) to an existing NEMA 4X non-purged enclosure that exists within a Class 1 Div 2 Groups B&D environment. I am putting a non-arcing (rated) DIN rail mounted disconnect on the 120VAC primary side.
The QUINT has internal 5A protection...
Thanks for the comments.
There are numerous examples of lights on conduit, vents, cameras, etc at many facilities. However, I was looking for a sound basis.
Any other feedback and information is welcome!!!
Thanks again,
Charles
