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Types of Chemical Injection Quills
To meet the demand for handling various chemical substances, there are a wide variety of injection quills that are found in industrial applications. All these chemical injection quills are categorized into one of the following two types:
Retractable Quills allow the operator to retract the injection quill without fully depressurizing the vessel or pipeline. These types of injection quills are complex in design and highly beneficial for clog-prone systems requiring frequent maintenance but where frequent shutdown is not feasible.
All retractable injection quills have the following components:
- Solution Tube that carries the treatment chemical.
- Restraint system to keep the solution tube in place.
- Isolation valve assembly consists of a valve and compression gland.
Non-Retractable Quills where the vessel or pipeline must be depressurized to remove the chemical injection quill. Non-retractable types of injection quills are widely used for chemical systems that do not form frequent deposits to clog the quill.
Depending on the number of Ports, injection quills are classified as follows:
- Dual Port Injection Quill: These types provide a uniform and rapid dispersal of two chemicals injected into one port.
- 3-port Injection Quill: Deaerators, boilers feed water tanks, etc use this type of injection quill for more uniform and rapid dispersal of chemicals into the center of the process pipe.
- 4-port Injection Quills: These are specially designed injection quills to disperse four chemicals into one port.
Advantages and Disadvantages
Advantages of Injection Quills
Precise Chemical Injection : Injection quills allow for accurate and controlled dosing of chemicals into a system, ensuring the proper mixing and distribution of additives.
Corrosion Protection : By injecting corrosion inhibitors directly into the flow stream, injection quills help protect the integrity of the system and equipment.
Reduced Maintenance : Proper chemical injection can help prevent scale buildup, biofouling, and other issues that may require costly maintenance and downtime.
Improved Efficiency : Injection quills promote efficient mixing of chemicals, leading to better process performance and overall system efficiency.
Versatility : Injection quills are versatile and can be used in various industries and applications where precise chemical dosing is required.
Disadvantages of Injection Quills
Initial Cost : The upfront cost of purchasing and installing injection quills may be a disadvantage for some operations, especially for smaller systems.
Maintenance Requirements : While injection quills can reduce maintenance in some cases, they require regular checks and maintenance to ensure proper functioning.
Compatibility Concerns : Ensuring the compatibility of the injection quill material with the chemicals being injected is crucial to prevent degradation or failure.
Flow Restrictions : Improperly sized or installed injection quills can cause flow restrictions in the system, leading to pressure drops or uneven distribution of chemicals.
Risk of Clogging : Injection quills may be susceptible to clogging if not properly maintained or if used with chemicals that can precipitate or solidify.
Overall, the advantages of using injection quills, such as precise dosing and improved system efficiency, often outweigh the disadvantages when implemented correctly and maintained properly.
Application fields
Chemical injection is used in many application such as injecting additives, chemical/bio treatment, and removal/separation process. To mention a few, below are examples of chemicals used in the oil/gas injection process:
Methanol
Used as hydrate inhibitors. Hydrate solidifies and can cause flow restriction or plugging in wells and flowlines.
Corrosion inhibitor
Used to mitigate the corrosion in wells and pipelines to reduce downtime.
H2S scavenger
Used to treat oil/gas in reducing H2S levels, to reduce health risk and corrosion.
The injection quill could come in various configuration, connections and fittings: From a simple fabricated tube/probe to an integrated assembly with isolation valves and non-return valves. As part of our specialty, we manufacture an integrated chemical injection quill, complete with probe, double block & bleed assembly (2 isolation valves + 1 bleed valve) and an integral non-return check valve, all in one compact assembly. Looking at the illustration above, this injection quill can also be converted into a sampling quill by a redesign on the probe and without the integral check valve. Sampling quill is used to safely take out fluid samples from the process line for analytical or laboratory purpose.
This type of quill is mounted into the pipeline through a fitting in such a way that the quill/probe is inserted and extends down to the center of the process line. The other end is connected to the chemical feed line by pipe or tubing connections all the way back to the chemical injection skid or chemical Dosing packages that house the pump and chemical tank.<
Chemical Injection Quill design standard
API 674: This standard covers the design, materials, and testing requirements for injection quills used in the oil and gas industry.
ANSI/ISA-78.00.01: This standard covers the design, materials, and testing requirements for injection quills used in the process industries.
MSS SP-69: This standard covers the design, materials, and testing requirements for injection quills used in the chemical industry.
BS 8062: This standard covers the design, materials, and testing requirements for injection quills used in the UK.
- Material: The injection quill must be made of a corrosion-resistant material that is compatible with the chemical that will be injected
- Diameter: The injection quill must have a small diameter to minimize the pressure drop in the fluid stream.
- Length: The injection quill must be long enough to ensure that the chemical is distributed throughout the fluid stream.
- Surface finish: The injection quill must have a smooth surface finish to minimize the risk of corrosion and blockage.
- Testing: The injection quill must be tested to ensure that it meets the design requirements.
It is important to follow the relevant design standard when selecting and installing an injection quill. This will help to ensure that the injection quill is safe and effective for the intended application.
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