Common codes for HVAC pipeline design

Codes commonly used in HVAC mapping



Code

Chinese name

English name



ATM

Atmospheric (pressure)

Atmosphere



B.B

Buyer Supply

By Buyer



BL

Device area boundary

Battery Limit



BOD

Duct bottom

Bottom of Duct



BOP

Tube bottom

Bottom of Pipe



B.S

Vendor supply

By Seller



B.V

Factory supply

By Vendor



CC

Medium to medium

Center to Center



CE

Mid to endpoint

Center to End



CF

Mid to noodle

Center to Face



CE

D

Center Elevatial



CL

Centerline

Center Line



C.S

Carbon steel

Carbon Steel



DEG

degree

Degree



D

diameter

Diameter



DBT

Dry bulb temperature

DryBulb Temperature



DN

Nominal diameter

Nominal Diameter



DR

Discharge

Drain



EL

elevation

Eleration



GL

elevation)

Ground Level



H.P

high pressure

High Pressure



Id

the inside diameter of

Inside Diameter



IN

inch

Inch



ISO

Axonometric

Isometric Drawing



L.P

Low pressure

Low Pressure



MAX

maximum

Maximum



MIN

Minimal

Minimum



N

north

North



N.W

net weight

Net Weight



OD

Outer diameter

Outside Diameter



PID

Pipeline flow chart

Piping Instrument Diagram



PN

Nominal pressure

Nominal Pressure



PN

Factory North

Plant North



QTY

Quantity

Quantity



R

radius

Radius



REF

reference

Reference



REV

modify

Revision



S

south

South



S.S

stainless steel

Stainless Steel



STD

standard

Standard



STL

steel

Steel



STM

steam

Steam



TEMP

temperature

Temperature



TOD

Duct roof

Top of Duct



TOP

Tube top

Top of Pipe



TOS

Bracket top surface

Top of Support



VAC

vacuum

Vacuum



VOL

Volume. Capacity. Volume

Volum



WBT

Wet bulb humidity

WetBulb Temperature



H

Heating system

Heating System



SA

Air supply system

Supply Air System



EA

Exhaust system

Exhaust Air System



AC

Air Conditioning System

Air Conditioning System



RA

Return air system

Return Air System



PA

Fresh air system

Primary Air System



SE

Exhaust system

Smoke Exhaust System



DR

Dust removal system

Dust Removal System



PS

Positive pressure air supply system

Positive Pressure Supply Air S



EV

Accident ventilation system

Emergency Ventilat System

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