Best Odorant Injection Systems, Odorizers, and Odorization System

What is the best U.S. odorization system, odorizer, and odorant injection system, and how to select which technology to use for an application? Here is your selection guide for GPL, Preco, YZ Odorizer, King Tool, and Welker systems.

GPL 750 odorant injection system

GPL 750 Odorant Injection System

Odorization System Selection Guide

We usually classify natural gas odorization equipment into two categories, chemical injection and chemical vaporization. The following guide will assist in selecting the best odorization or odorant injection system for your application.

To begin, the operator will want to know:

  1. The gas type and application (e.g., the transmission line, methane producer, farm tap, and so on)
  2. Where will the equipment be installed?
  3. Understand the gas properties (e.g., pressure range, temperature range, flow range)

Reviewing these three factors and the advantages and disadvantages of the systems will help determine which equipment best suits your application.

Natural Gas Odorant Injection System

GPL 10000 odorant injection system with odorant tank

GPL odorizers are reliable, cutting-edge—yet simple, inexpensive to operate, and planet-friendly!

Odorant injection systems odorize natural gas at transmission pipelines, cities, municipalities, medium-size loads, city gate stations, methane producers, and low-volume applications. The chemical injection pumps are actuated differently depending on the manufacturer. However, they could be pneumatically actuated, solenoid-driven, or electrically driven to inject a known odorant volume into the gas. Most Preco and YZ Systems utilize the pipeline gas to actuate the system, though one manufacturer offers a sealed ventless design (GPL systems are eco-friendly). By adding small volumes of liquid odorant into flowing gas, the gas becomes odorized. In this odorant injection style, a computer controller monitors the flow, which will vary the injection rate.

Advantages of chemical Injection
  • Accurately odorizes gas over wide flow ranges.
  • Built-in alarms (GPL Odorant Injection has mobile alerts, also)
  • Remote control access from computers (GPL permits access from smartphones, too)
  • Audit trail to demonstrate proper odorization rate and proof of continuous odorization
  • Susceptible to lightning damage and backup power required for outages
  • It is not usually considered for low volumes as there may be too much time between injection doses; however, GPL Odorizers provide uniform odorant injection for low flow (even no-flow).
  • More costly than evaporative systems

Three top odorant injection system manufacturers in the United States:

  • GPL models: GPL 750 and GPL 10000 – Reliable, cutting-edge—yet simple, inexpensive to operate, and planet-friendly
  • PRECO Pump Injection – Providing systems for high volume and high pressure since 1969
  • YZ Systems – YZ NJEX – YZ is a top-selling and most popular odorant injection system.

Vaporization Systems

Two standard vaporization systems are the wick-type and bypass-type.

Wick Type Odorizer

The wick-style system is one of the oldest types for low volume applications of less than 500 SCFH. The wick-style unit is known as the “farm-tap” odorizer and perhaps the only way to odorize a single customer. They are for camps, trailers, instrumentation leak detection, and domestic farm taps. These small units are installed on a service line near the gas meter. A wick inserts into the odorant and becomes saturated, and the opposite end extends into the gas stream. The odorant draws up the wick and evaporates into the gas, creating the desired smell.

Advantages of wick type
  • Simple to use
  • Farm-tap
  • Inexpensive
  • Only suitable for low flow and consistent flow applications
  • Gas can become over odorized during the summer while the gas flow is low.
  • Gas can be under odorized in winter when gas flow is high.
  • No tracking ability and challenging to monitor
  • Susceptible to liquid contamination, and contamination will impede odorant vaporization.

Bypass Systems

The bypass unit is for a small or low-volume system. In this process, part of the gas stream diverts to a tank containing liquid odorant. Most of these systems include wicks to increase vaporization. The amount of gas diverted depends upon the gas flow. The gas flows through the odorant tank, and when exiting, it is saturated and returns to the gas pipeline, odorizing it.

Advantages of Bypass
  • Efficient
  • Economical
  • Easy to fill, install and replace
  • Not accurate during wide gas flow variations
  • Inaccurate when odorant is contaminated
  • Will stop odorizing in freezing temperatures if water contaminates the odorant.
  • Requires monthly inspection
  • Releases odorized gas to the atmosphere with each tank refill.

Top chemical vaporization manufacturers in the United States are:

  • King Tool – wick type and bypass
  • Peerless bypass

Pulse Bypass

The pulse bypass odorizer is a variation of the vaporization system worthy of mention.

The pulse bypass is a modified bypass unit that permits tracking the gas flow. Here, the higher pressure gas from a pipeline introduces odorant vapors into a lower pressure distribution line. By diverting non-odorized natural gas through an odorant tank, the gas is saturated, then returns to a downstream distribution pipeline. This style is suitable for lower flow applications, and while it is more expensive than the traditional bypass, it offers cost incentives over feature-rich chemical injection systems.

Top pulse bypass odorization system manufacturers in the United States include:

  •  Preco
  •  Welker Odoreyes

If you have questions about using an odorization or natural gas odorant injection system, contact us.


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