api 551
api 551
(OP)
I am in the middel of reading api 551, process measurement and instrumentation.there some unclear points I faced with.I needed some helps in this regard. For example in sec. 2.2.2 the last sentense is unclear.
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RE: api 551
The last sentence of the 1993 version reads, "Insulation and heating of long lines to prevent freezing are also minimized or eliminated by the use of transmission systems."
This refers to a side benefit of pneumatic/electrical measurment signaling because pneumatic/electric signaling does not require the costs and maintenance of insulation and heat trace that piping some hydrocarbons might require.