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IIAR Ammonia Pipe Marker Reference Guide

IIAR Ammonia Pipe Marker Reference Guide

IIAR Ammonia Pipe Marker

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:

IIAR Ammonia Pipe Marker Guidelines

1. Ammonia System Identification

Wording "AMMONIA" in black letters on an orange 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 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

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
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

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.