Water $($containing some oil and gas$)$ is collected from different equipment and

sent to Closed Drain Vessel. In this vessel final separation of the three phases $($gas$,$

oil and water$)$ takes place.

$1.$ Gas separated from liquid is sent to LP Flare Header

$2.$ Oil rich water is recycled to First Stage Separator

$3.$ Water is sent to Hazardous Drain Caisson for safe disposal Question::::follow DNV$-$RP$-$G$101$ and do RBI analysis of offshore closed drain system, decribe of the process, what is happening $,$ what is flowing in the pipe and what material it is$,$ Year of installation $=2010$

Rate of corrosion for hydrocarbon $($gas or liquid$)$ corrosion of carbon

steel: Mean rate is $0,25$mm$/$year Standard deviation is $0,2$

$4.$rate of corrosion for hydrocarbon corrosion of carbon steel after addition of corrosion inhibitor: Mean rate is $0,025$mm$/$year Standard deviation is $0,2$

Operating temperature $=50$oC

Operating pressure $=20$ bar $1.$ Material data sheet $=$N ORSOK L$001$

$2.$Product Service Codes $=$ DNV$-$RP$-$G$101$

$3.$Insulation:

PP $$ Personal Protection

PFP $$ Passive Fire Protection

No Mention $$ No insulation