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A/G above ground ATM atmosphere B bend BBP bottom of base plate BE beveled end BF blind flange BL battery limit BOP bottom of pipe BW butt weld Centerline COD continued on drawing CONC concentric CONN connection CS carbon stell DIA diameter DIM dimension DISCH discharge DN design north DR drain DWG drawing ECC eccentric E east EL elevation ELECT electrical FF flat face FLG flange FOB flaton bottom FOT flaton top GALV galvanized GAS gasket HOR horizontal HS hose station INST instrument LJ lap joint µØÉÏ ´óÆø ÍäÇú µ×°åµ×Ãæ ÆÂ¿Ú ä°å·¨À¼ ±ß½ç ¹Üµ× ¶Ôº¸ ÖÐÐÄÏß
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M meters Ã× MM millimeters ºÁÃ× MH manholes ÈË¿× MIN minimum ×îС ML match line ½ÓͼÏß N north ±± OD outside diameter Íâ¾¶ OPER operating/operator ²Ù×÷ PE plain end ƽ¶Ë PLATF platform POS point of support RF raised face RO restriction orifice S south SCH schedule SPEC specification SW socket weld STD standard SUCT suction THD threaded TL tangentline TN true north TOC top of concrete TOS top of steel TYP typical U/G underground VT vent VERT vertical W west W/ with WP working point ¹¤ÒÕÁ÷³Ìͼ ¹ÜµÀÒDZíÁ÷³Ìͼ ¹«ÓÃÁ÷³Ìͼ ¿òͼ
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process flow diagram (PFD) process piping & instrument utility flow diagram block flow diagram
utility balance diagram (UBD) plot plan
general arrangement general plot plan planning drawing
piping study drawing
piping arrangement drawing key plan
piping routing study drawing
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·§ÃźŠµÈ¼¶·Ö½ç ÖØÒª¹ÜµÀ ×Ü¹Ü underground piping drawing piping special parts drawing piping hanging drawing prefabrication drawing reference drawing typical drawing vendor¡¯s drawing
isometric piping drawing as-built drawing model
line schedule
calculation sheet drawing schedule issue stage
revision number numbering system scale
plant north
over-sea mean level [OSL] elevation [EL]
existing structure loading area utility station column number headroom access way cat way
top of structure elevation bottom of piping elevation run size
eccentric reducer elevation center to face
working point elevation hanging marking cold spring line symbol
line connection stream NO.
(1) class designation (2) spec designation valve No.
specification break critical piping header pipe
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restriction orifice flow nozzle mixing tee spray nozzle strainer
temporary strainer steam trap rupture disk
steam-traced piping jacketed piping underground piping steel pipe threaded pipe flanged pipe swage
smooth bend U-bend
bending pipe
expansinon bellows flexible pipe
pipe fitting joint mechanical joint lapped joint ring type joint flare type joint flareless type joint bell and spigot