[Mike Vezina]

JOP is absolutely correct, that the foreman and the project engineering team, had no idea what they were doing.
In the real world, we do not know the actual length of any manufactured component, nor the actual cut length of pipe, due to the industry standard of manufacturing tolerances.
Until all components are assembled for final installation, the actual length is not known, hence the assembly crew, field or shop, must adjust the final cut length for piping.
Also if the assembly involves no piping, but a number of manufactured components, then there is no way to know the final overall length, until after final assembly on site.
Hence the old rule that at least one pipe spool must be included in any long assembly of manufactured components so the field has the ability to trim the assembly length to suit the overall required length.
Also the larger the pipe diameter, the larger the allowable manufacturing dimensional tolerances.

[Mike Vezina]

knives

Working on large scale facilities the platforming for equipment, control and operating valve stations, PSV valves, become quite large and a lot of them. The natural layout configurations produce a lot of dead end platforms.
…I got off track and since that posting and more research, the short answer would be:
– Dead-end platforms shall not be more than 6 meter long. (plus or minus using common sense)
– All elevated platforms within a hazardous work site classification shall have two means of emergency egress.
– Emergency egress facilities shall be positioned as far from each other as practicable provided that they are so arranged that travel distances in high hazard situations shall not exceed 75 feet (23 m).

Please excuse my previous rambling on
MNV

[Mike Vezina]

Thanks Anton

Your reasoning makes sense for the shorter dead end platform length.
Considering how long the old EC majors and old energy companies have been using this standard, it must have been well hashed out with actual operations and concern for personnel safety being paramount in setting the layout limitations.
I’m trying to establish a maximum acceptable to the industry to finalize an access layout specification, while also being able to have reasonable industry backup for my decision, since it involves redesign time for those who do not adhere to the layout rules.

MNV

[Mike Vezina]

On the subject of piping spans.
The petroleum industry has a standard of 1/2″ to 3/4″ maximum deflection, depending on the owner.

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