Seton Identification and Safety Products
IIAR Pipe Marker Regulations
Ammonia System Identification
Physical State
Pressure Rating
Ammonia System Abbreviations
Directional Flow Arrows
IIAR Ammonia Pipe Marker Reference Guide(view printable PDF of this page here)
Summary of IIAR Standard

The purpose of this standard, developed by the International Institute for Ammonia Refrigeration (IIAR) is to create a uniform system for identification of ammonia refrigeration piping and system components.
Pipe Markers
The pipe marker should have five sections:
1. Ammonia System Identification:
Wording "AMMONIA" in black letters on a yellow background
2. Physical State:
The physical state of the refrigerant located to the left of "AMMONIA":
    a. If Liquid - Wording "LIQ" - in black or white letters on an orange background
    b. If Vapor - Wording "VAP" - in black or white letters on a sky blue background
    c. If Both - Wording "LIQ" "VAP" - both printed in the colors designated above

3. Pressure Rating:

The pressure level of the refrigerant located to the right of "AMMONIA":
    a. If High Pressure - Wording "HIGH" - in black or white letters on a red background
    b. If Low Pressure - Wording "LOW" - in black or white letters on a green background

4. Ammonia System Abbreviations:
Abbreviation
System
BD
Booster Discharge
CD
Condenser Drain
DC
Defrost Condensate
ES
Economizer Suction
EQ*
Equalizer
HG
Hot Gas
HGD
Hot Gas Defrost
HPL
High Pressure Liquid
HSD
High Stage Discharge
HSS
High Stage
HTRS
High Temperature Recirculated Liquid
LIC
Liquid Injection Cooling
LSS
Low Stage Suction
LTRL
Low Temperature Recirculated Liquid
LTRS
Low Temperature Recirculated Suction
PO*
Pump Out
PU*
Purge
RV
Relief Vent
TSR
Thermosyphon Return
TSS
Thermosyphon Supply
* Not currently covered in the IIAR standard
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5. Directional Flow Arrows:
To indicate ammonia refrigerant flow direction, directional arrows are illustrated on the pipe marker. 2 of Seton’s 3 ammonia pipe marking options, Setmark® and Ultra-Mark® ammonia pipe markers, come with directional arrows on the marker. The Opti-Code™ version does not include arrows, thus making Seton’s Arrows-On-A-Roll tape a great accessory.
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