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 1
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
2
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
3
WATER SYSTEMS 水系统
BFW BOILER FEED WATER 锅炉给水 FW FIRE WATER 消防水
IW INTERMEDIATE WATER 二次水
CWR COOLING WATER RETURN 冷却水回水
CWS COOLING WATER SUPPLY 冷却水
PW POLISHED WATER 工艺水
QW QUENCH WATER
急冷水
UW UTILITY WATER 工业水 WW WASTE WATER 废水
MISCELLANEOUS ABBREVIATION AND SERVICE 各种缩写和符号
A AIR MOTOR 空气马达 ACC ACCESSIBLE 可接近的
SYMBOLS 4
ATM ATMOSPHERE 大气
BL BATTERY LIMIT 界区
BTS BUBBLE TIGHT SHUT-OFF 缓慢紧密切断 BV BY VENDOR 由供应商提供 CONN CONNECTION 连接
CSC CAR SEAL CLOSED 关闭锁定
CSO CAR SEAL OPEN 打开锁定
DEC DETAIL ENGINEERING CONTRACTOR 工程承包商详细资料 EOR END OF RUN 运行结束 SOR
EW EYEWASH 洗眼 FLG FLANGE 法兰
LC LOCKED CLOSED 锁定关闭
LO LOCKED OPEN 锁定打开
NC NORMALLY CLOSED 正常情况下关闭 NNF NORMALLY NO FLOW
5
常见的PID图例缩符号
