Chemical Injection Quills


Chemical injection quills are specialized devices widely utilized in industries such as power, oil & gas, offshore, and desalination. They play a crucial role in the treatment, mixing, and neutralizing of process fluids, ensuring complete mixing between the main fluid stream and the introduced chemicals. This article explores the significance of chemical injection quills, their benefits, materials of construction, and their applications in various industrial sectors.



Chemical injection tubes are specialized equipment widely used in the power, oil and gas, Marine and desalination industries. They play a vital role in the handling, mixing and neutralization of process fluids, ensuring complete mixing between the main stream and the introduced chemicals. This article explores the significance of chemical injection quills, their advantages, building materials, and their applications in various industrial sectors.

What is a Chemical Injection Quill?

The chemical injection pipe serves as the interface between the chemical feed pipe and the processing pipe. Its main function is to safely and efficiently inject chemicals into pressurized pipes, tanks or containers. By injecting process fluid in the center of the main header, injection of the plume promotes uniform mixing and prevents cross-flow effects along the pipe sidewalls. They are widely used in petrochemical, chemical, petroleum, power and related industries.

chemical injection quill

Benefits of Using Chemical Injection Quills:

The use of chemical injection needles has a double advantage. First, they provide a safe and effective means of connecting liquid chemical feedstocks to pipes or containers, reducing the risks associated with corrosive, flammable or hazardous substances. Second, these spines improve the efficiency of the chemical feed system by ensuring the uniform dispersion and optimal mixing of chemicals in the pipeline.

Flow Direction and Mounting Types:

When installing an injection tube in a liquid stream, the end of the 45 degree Angle should face downstream. For larger pipes, the end of the quill should be placed at the midstream or at least 2 inches from the bottom of the pipe. The injection tubes are available in different mounting options, including 2 “flanges, 2” welded joints, and 1 “NPT welded base. These changes are adapted to the specific installation requirements of different industries.

chemical injection quill

Materials of Construction for Injection Quills:

Injection quills are manufactured using various materials, including Inconel 825, Inconel 625, Hastelloy, Monel, Stainless Steel, and Forged carbon steel. These materials are selected for their chemical resistance and durability, ensuring the quills can withstand the corrosive nature of the process fluids they come into contact with.

When to Use a Chemical Injection Quill:

Chemical injection quills are particularly useful in the following scenarios:

– Connecting a liquid chemical feed to a pipeline or vessel, especially when dealing with corrosive substances to prevent damage to the side port or pipe wall.

– Ensuring chemicals are evenly dispersed in the center of the pipeline, promoting uniform mixing and preventing corrosion on the inside of the process pipe.

– Dosing chemicals into a higher velocity interior section of the flow, which improves mixing through flow dynamics and prevents sidewall and fitting corrosion.

chemical injection quill 4

Types of Chemical Injection Quills:

There are two main types of chemical injection needles: retractable and non-retractable. Both types serve the same purpose, but the retractable quill offers the added advantage of being easy to retract for easy maintenance. The retractable quill allows the maintenance team to clean and clean the quill, ensuring its continued effectiveness. Regular maintenance is essential because handling chemicals can form deposits that may eventually clog the feather tube. Removing these deposits is essential for the quill to perform its function effectively.

Maintenance and Clearing of Chemical Injection Quills:

To maintain optimum performance, chemical injection needles must be regularly maintained and cleaned. Deposits from handling chemicals, such as sodium hypochlorite, ammonia, and polymers, can build up over time, leading to blockages. Just like cleaning toilets on a small scale, maintenance teams have to clean these deposits regularly to make sure the quills are working effectively.


Chemical injection quills are an essential part of various industries, facilitating the safe and efficient addition of chemicals to pipes, tanks or ships. By ensuring even mixing and preventing damage to infrastructure, these feather tubes improve the safety and efficiency of industrial processes. With a wide range of materials and installation options, chemical injection feather tubes can be customized to suit specific applications. Regular maintenance and cleaning are necessary to ensure its continued performance. Leveraging the benefits of chemical injection tubes enables the industry to effectively manage chemical treatments, avoid risks, optimize processes, and increase productivity and service life.





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