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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.
The pipe marker should have five sections:
Wording "AMMONIA" in black letters on an orange background
The physical state of the refrigerant located to the left of "AMMONIA":
a. If Liquid - Wording "LIQ" - in black or white letters on a yellow 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
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
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 |
HTRL
|
High Temperature Recirculated Liquid |
HTRS
|
High Temperature Recirculated Suction |
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 |
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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