Installing an Intrinsically Safe Liquid Sensor in a Class 1, Div 1 Location

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Wow, all this is surprising to me. Morrison is not some small, local operation; they are a major national petroleum equipment manufacturer.

Morrison Bros. Co. History
Morrison Bros. Co. started making boilers in Dubuque, Iowa in 1855. By the turn of the century the company was
fabricating tanks and equipment for the oil business and the name Morrison was well established in the industry and
became known as the "Oil Equipment Headquarters."

Today the company remains one of the more recognized and respected producers of petroleum marketing equipment
in the United States and abroad.

Product Line
Morrison Bros. Co. has over 1200 different products forming the most complete line of AST Equipment manufactured
in the world. The products cover a broad spectrum of the industry, including tank trim for retail service stations,
aboveground storage tank equipment, transportation, environmental monitoring, bulk fuel storage, and certain industrial
applications for fuel and water systems.
​


I can't believe I'm the first person in their 161 year existence to come across this issue with their equipment and instructions. I'm not trying to be argumentative, I'm just bewildered.
 
Jon456 said:
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I can't believe I'm the first person in their 161 year existence to come across this issue with their equipment and instructions. I'm not trying to be argumentative, I'm just bewildered.
Click to expand...
It's hard to explain the current situation without a fairly long history lesson. I will say that any manufacturers that have not been intimately involved with ISA for the last 25 years or so are at a distinct disadvantage with respect to intrinsically safe (IS) or nonincendive (NI) installations.

If you read ANSI/ISA 12.06.01 or it cousin ANSI/ISA 12.12.01 carefully, you will find a hidden relationship between IS, NI and Article 505 (NEC Zones). The original ISA documents were developed in the early 1990s with the hope of introducing a new Division 0 for locations that were always hazardous to the NEC. The hidden intent was to relax Division 1 requirements and permit IEC type enclosures. The ultimate reason was to reduce weight for offshore rigs which have many enclosed rooms that are Division 1 locations.

This isn't the whole history but I'm busy taking care of other business ATM. I may try to finish later.
 
Division 0 didn’t fly; it scared the bejabbers out of FedOSHA and the IAEI.

In the meantime, ISA managed to become the US representative on the IEC Standards Committee for Hazardous Atmospheres; not NFPA, not NEMA, not IEEE, ISA. Two very influential members from the ANSI/ISA SP12 Special Projects Working Group became the US Delegate and Alternate to the IEC Tech Committee. I want to be clear – they were both very qualified; however, they also both had vested interests in offshore rigs. Every ounce on marine facilities is costly. Lighter weight IEC wiring methods for classified locations is very attractive.

This began the road to Article 505 and it’s dependence on IS where flammable atmospheres are always present or for long periods of time (Zone 0). If analyzed properly, Zone 1 is actually a moderately “super” Division 2.

IEC demands some fairly rigorous analysis for IS and wants to be certain it isn't haphazardly applied and CMP14 has historically been paranoid about bonding. Thus all the hoops for Articles 504 and 505. With all the bells and whistles required for classifying per Zones [Sections 505.5 and 505.7(C)] the NEC originally required classification documents to be made by licensed engineers.
 
Jon456 said:
Wow, all this is surprising to me. Morrison is not some small, local operation; they are a major national petroleum equipment manufacturer.

Morrison Bros. Co. History
Morrison Bros. Co. started making boilers in Dubuque, Iowa in 1855. By the turn of the century the company was
fabricating tanks and equipment for the oil business and the name Morrison was well established in the industry and
became known as the "Oil Equipment Headquarters."

Today the company remains one of the more recognized and respected producers of petroleum marketing equipment
in the United States and abroad.

Product Line
Morrison Bros. Co. has over 1200 different products forming the most complete line of AST Equipment manufactured
in the world. The products cover a broad spectrum of the industry, including tank trim for retail service stations,
aboveground storage tank equipment, transportation, environmental monitoring, bulk fuel storage, and certain industrial
applications for fuel and water systems.
​


I can't believe I'm the first person in their 161 year existence to come across this issue with their equipment and instructions. I'm not trying to be argumentative, I'm just bewildered.
Click to expand...
I'm not surprised, Morrison Bros is known for their hardware, ie, valves, sumps, E-vents, gauges etc and not electronics. You'd think if they were selling it they would do their homework. Good job catching it, I probably would have assumed it was ok and installed it

I've been to several different training classes on the install of IS systems. Veeder Root and Incon used to put on 3 or 4 days classes on installation, programming etc, now its probably all on the Net but... Anyway I've never seen a control drawing from either of these 2 manufacturers. I found one for a popular Veeder Root system. They do not include a control drawing in their install manuals that I've been able to find but they are available online http://www.veeder.com/gold/gold_public_access.cfm?section_id=210 Haven't looked for Incon yet but I will. I've installed 100s of these systems but little did I know.
 
I note that in the Veeder list you linked to, drawings that were listed as control drawings were also self identified as control drawings in the body of the document.
 
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