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LINE SERVICE IDENTIFICATION
SYMBOL SERVICE 符号 帮助 AIR SYSTEMS 空气系统 IA INSTRUMENT AIR 仪表风 PA PLANT AIR 工厂风 DA 烧焦空气
STEAM AND CONDENSATE SYSTEMS 蒸汽和凝液系统
HC HIGH PRESSURE CONDENSATE 高压蒸汽凝液
MC MEDIUM PRESSURE CONDENSATE 中压蒸汽凝液
LC LOW PRESSURE CONDENSATE 低压蒸汽凝液 SC SURFACE CONDENSATE 表面凝液 DS DILUTION STEAM 稀释蒸汽
HS HIGH PRESSURE STEAM 高压蒸汽 MS MEDIUM PRESSURE STEAM 中压蒸汽
LS SUPERHEATED LOW PRESSURE STEAM
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过热低压蒸汽
PS SATURATED LOW PRESSURE STEAM 饱和低压蒸汽
SHS SUPER HIGH PRESSURE STEAM 超高压蒸汽
DRAIN SYSTEMS 排放系统
CD CHEMICAL DRAIN 化污 LD LIQUID DRAIN 液体排放
ND NON-CONTAMINATED POLLUTION DRAIN 无污染排放 OD OILY DRAIN
油污
EXHAUST AND VENT SYSTEMS
AV ATMOSPHERIC VENT (NOT FROM PSV) 通大气（不从安全阀） SV SAFETY VALVE TO ATMOSPHERE 安全伐排大气
FLARE SYSTEMS 火炬系统
DF DRY FLARE 干火炬 WF WET FLARE 湿火炬
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GAS SYSTEMS 气体系统 FG FUEL GAS
燃料气
HG HYDROGEN 氢气 NG NITROGEN
氮气
SPECIAL LIQUID SYSTEMS 特殊液体系统 CL CAUSTIC 腐蚀性 QO QUENCH OIL
急冷油
SO SEAL OIL 密封油 WO WASHING OIL
冲洗油（压缩机）
PROCESS SERVICE (NORMAL) P PROCESS 工艺
REFRIGERANT SYSTEMS BR BINARY REFRIGERANT 二元制冷
PR PROPYLENE REFRIGERANT 丙烯冷剂
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常见的PID图例缩写符号
