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...
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...
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...
I've found plenty guidance on horizontal pipe supporting, but very little to none on vertical.
Can anyone please help me determine how far the following pipe sizes can extend beyond the last support if they are installed VERTICALLY? Basically, how high can I extend a vent pipe after the last...
Folks:
I see plenty info on horizontal spans and distance between supports, but nothing so far on what I need.
I will be tasked with installing some small diameter vent piping (1" - 2") and would like to get input from the more experienced people.
Q1) Is there a guideline to use for...
If I am doing a simple load calculation on a steel member that was made of two pieces welded together, do I consider the member as a single piece or do I have to give special consideration to the weld?
Does the weld weaken the member and prevent me from looking at the member as a single piece...
Hi all,
Process conditions:
1. Compressor Engine Exhaust
Press: 1-2 psig
Temp: 1500 F (max) w/ a 1250 F shutdown
Material: 316 SS
Spec: Class 150
a. We are shop fabricating new sections of 316SS piping (approx 10' long) that will have multiple nozzles. I planned on specifying...
Good morning,
As my handle states, I am a new mechanical engineer and I need assistance from you experienced engineers.
I need to determine if I can branch off an existing natural gas line that currently supplies gas to boilers on the 18 floor of a hotel. I have to tie in a 1-1.5" line for a...
I am new to this website as well as engineering. I originally posted this last night to the Controls Engineering page, but am not sure if that was the best site. I have a specific question regarding inserting a sample probe in a relatively high pressure line.
We have a 400 psig line that was...
I am new to this website as well as engineering. I have a specific question regarding inserting a sample probe in a relatively high pressure line.
We have a 400 psig line that was hot tapped and valved. We now have a retractable probe that will mount to the 1-1/2" full port valve. After...
