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Pipe Markers
IIAR Pipe Markers
IIAR Ammonia Refrigeration Pipe Markers
The International Institute of Ammonia Refrigeration (IIAR) standardizes pipe labeling for Ammonia Refrigeration Piping and System Components.
IIAR Marker Styles
Brady offers a variety of ammonia pipe markers that comply with the IIAR's established guidelines, including self-adhesive markers, snap-around marker styles and high performance pipe markers recommended for harsh environments.
Ammonia piping abbreviations
Abbr. System
BD Booster Discharge CD Condenser DC Defrost Condensate EQ* Equalizer ES Economizer Suction HGD Hot Gas Defrost HPL High Pressure Liquid HSD High Stage Discharge HSS High Stage Suction HTS* High Temp. Suction HTRL High Temp. Recirculated Liquid HTRS High Temp. Recirculated Suction
Abbr. System
LTRL Low Temp. Recirculated Liquid LTS* Low Temp. Suction LTRS Low Temp. Recirculated Suction LIC Liquid Injection Cooling LSS Low Stage Suction PO* Pump Out PU* Purge RV Relief Vent TSR Thermosyphon Return TSS Thermosyphon Supply
*Not currently covered in the IIAR standard Physical state of the refrigerant: Liquid (LIQ) black or white on yellow Vapor (VAP) black or white on sky blue Both (LIQ and VAP) both in colors listed above Pressure level of the refrigerant: HIGH black or white on red LOW black or white on green HIGH and LOW both in colors listed above Marker body AMMONIA in black letters on orange background Ammonia piping abbreviation *See chart below
Orange vs. Yellow
Orange was adopted by the International Institute of Ammonia Refrigeration (IIAR) for ammonia markers, instead of yellow, because it meets the ANSI A13.1 (2007) revised standard for toxic and corrosive fluids. Yellow will continue to be available for established facilities needing replacements. IIAR B-689 High Performance Wrap-Around Marker Styles and Sizes
Style Code Outside Diameter Letter Height Marker Size
Style: I 1.5 in. to 2.378 in. 0.75 in. 9 in. x 8 in. (uncoiled) Style: II 2.5 in. to 7.875 in. 1.25 in. 26 in. x 12 in. (uncoiled)
IIAR B-681 / B-883 HPHV Marker Styles and Sizes
Style Code Outside Diameter Letter Height Marker Size
Style: HPHV 8 in. or larger 3.5 in. 4 in. x 24 in. (includes 2 mounting clips)
B-946 Self-Sticking Marker Styles and Sizes
Style Code Style Example Outside Diameter Letter Height Marker Size
Style: 1HV 8 in. or greater 3.5 in. One 4 in. x 24 in. marker per card Style: 1 2.5 in. to 7.875 in. 2 in. One 2.25 in. x 14 in. marker per card Style: 4 0.75 in. to 2.378 in. 0.75 in. Four 1.125 in. x 7 in. markers per card*
* Use in conjunction with 1 in. arrow tape to meet the 8 in. marking required by ANSI standards.
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