Pipeline Class Locations
Pipeline Class Locations
(OP)
This is just a general question but where do the requirements for the class location originate from? So for example, a class 1 is intended for 10 or fewer buildings or dwellings. My question is why is it 10 and not 11 or no? Who made the decision that it was 10 for class 1 and 46 for class 2, etc?





RE: Pipeline Class Locations
I really don't know. Good question.
RE: Pipeline Class Locations
RE: Pipeline Class Locations
Remember - More details = better answers
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RE: Pipeline Class Locations
You got that one backwards. Part 192 took the table from ASME B31.8 table 841.114B. Project B31 was started by an organization that became the American National Standards Institute) in 1926 at the request of ASME (this is from the B31.8 Forward). The first edition was published in 1935 with a fairly stable version being published in 1942. The pipe thickness calculations changed in 1947, and then the whole thing was reorganized into the sections we know and love today (as best I can tell, that was when Location Class was introduced, but I'm not certain). The first edition of B31.8 was in 1952 built almost entirely from the 1951 Section 2, 6, and 7. 49 CFR 192 became law in 1970.
The table in ASME B31.8 came from the fertile minds of the committee and the companies they represent(ed). They wanted Class 1 to represent "sparse population" and being mostly engineers felt obligated to stick a number to "sparse" and it became "less than 10". As it was related to me many years ago there was zero science or statistical risk assessment that went into that number. They just wanted "sparse". Same way with the upper limit of Class 2 being 46.
David Simpson, PE
MuleShoe Engineering
In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist
RE: Pipeline Class Locations
RE: Pipeline Class Locations
There are a couple of references which don't come up in a search but it seems authentic.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Pipeline Class Locations
Looks like it gets as close as we can to the answer. Looks obvious to me it was just a number out of thin air that the committee picked
RE: Pipeline Class Locations
I don't think they plucked it from thin air exactly, but made a reasoned study - there is mention that some consulting engineers were involved - to turn what was agreed to be "typical" low density - 1 - low to medium -2 - and high density from the aerial photos into numbers people could use. There also seems to have been some investigation into how this would affect design in terms of percent of a route that would be affected.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Pipeline Class Locations
http://www.penspen.com/wp-content/uploads/2014/09/...