Ammonia Pipe Labeling Guide

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Identification Guide for Ammonia Refrigeration Piping

1. Use Arrows to Indicate the Direction of Flow in the Pipe.

2. Use the Following Abbreviations to Properly Identify System Components.

	BD	Booster Discharge
	CD	Condenser
	DS	Defrost Condensate
	ES	Economizer Suction
	HGD	Hot Gas Defrost
	HPL	High Pressure Liquid
	HSD	High Stage Discharge
	HSS	High Stage Suction
	HTRL	High Temperature Recirculated Liquid
	HTRS	High Temperature Recirculated Suction
	LTRL	Low Temperature Recirculated Liquid
	LTRS	Low Temperature Recirculated Suction
	LIC	Liquid Injection Cooling
	LSS	Low Stage Suction
	RV	Relief Vent
	TSR	Thermosyphon Return
	TSS	Thermosyphon Supply

3. Indicate Whether the Refrigerant is a Liquid, Vapor, or Both.

	LIQ - Orange Color Band Indicates Liquid State
	VAP - Blue Color Band Indicates Vapor State
	Use both color bands if both liquid and vapor may be present.

4. Print "Ammonia" in Black Letters on a Yellow Background.

5. Indicate Whether Internal Pipe Pressure is High or Low.

	High - Red Color Band Indicates High Pressure
	Low - Green Color Band Indicates Low Pressure

This guide is intended for general information purposes only. This guide is not a substitute for review of applicable government regulations and standards.

Ammonia Pipe Marking Guide
Shows the IIAR ammonia pipe marking standards, Can be used as a wall chart or desk reference. No cost. It's yours just for asking.

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