One lesson per day: Understanding PID diagrams – Lesson 2

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Process materials: PA process air, PG process gas, PGL gas-liquid two-phase flow process material, PGS gas-solid two-phase flow process material, PL process liquid, PLS liquid-solid two-phase flow process material, PS process solid, PW process water； Air: AR air, CA compressed air, IA instrument air ； Steam, Condensate Water: HS high-pressure steam, LS low-pressure steam, MS medium-pressure steam, SC steam condensate water, TS heat-tracing steam ； Fuel: FG fuel gas, FL liquid fuel, FS solid fuel, LPG liquefied petroleum gas, NG natural gas, LNG liquefied natural gas ； Water: BW boiler feed water, CSW chemical wastewater, CWR circulating cooling water return water, CWS circulating cooling water supply water, DNW desalinated water, DW drinking water, domestic water, FW fire water, HWR hot water return water, HWS hot water supply water, RW raw water, fresh water, SW soft water, WW production wastewater ； Oils: DO waste oil, FO fuel oil, GO dressing oil, LO lubricating oil, RO crude oil, SO sealing oil, HO heat transfer oil ； Refrigerant: AG – gaseous ammonia; AL – liquid ammonia; ERG – gaseous ethylene or ethane; ERL – liquid ethylene or ethane; FRG – Freon gas; PRG – gaseous propylene or propane; PRL – liquid propylene or propane; RWR – return water of chilled brine; RWS – supply water for chilled brine ； Others: H – hydrogen, N – nitrogen, O – oxygen, DR – drainage or condensate, FSL – molten salt, FV – flare emissions, IG – inert gas, SL – slurry, VE – vacuum emissions, VT – venting, WG – waste gas, WS – waste residue, WO – waste oil, FLG – flue gas, CAT – catalyst, AD – additives.