Why McLanahan Frac Sand Plants
McLanahan is the leader in creating complete wet processing solutions to produce frac sands needed in the oil and gas well drilling industry. In-house process engineers take each deposit’s unique characteristics into account and work directly with customers to determine layout and equipment requirements.
A major benefit of working with McLanahan is our in-house designed and manufactured equipment, which includes Attrition Cells, Hydrosizers™, Centrifugal Pumps, Hydrocyclones and Separators™, Dewatering Screens, Fine Material Screw Washers, Thickeners and Filter Presses.
McLanahan’s process engineering team is regularly engaged by companies to audit competitor plants. Reviews like this provide insights based on our unique expertise, along with recommendations for process improvement. Often, the result of this is that any modifications and future plants are of McLanahan’s design and supply.
How Frac Sand Plants Work
Frac Sand Plants can be engineered in many configurations, including high capacity multi-stage classification and long attritioning cycles, or the plants can be as simple as skid-based Cyclones and Dewatering Screens making a 140 mesh cut.
The final design of a plant will depend on the nature of the deposit and desired products. However, these decisions can also be influenced by downstream processing in the dry plant.
Before making the investment in a deposit or plant, it is necessary to test the deposit to see if it meets the American Petroleum Institute's (API) requirements for frac sand. The official standards can be found here. Examples of these requirements can include:
- Silica content of 99% or higher
- Size fractions typically 20 x 40, 40 x 70 or 70x140
- Sphericity and roundness of greater than or equal to 0.6
- Low acid solubility - solubles (CO3, fsp) usually washed out in processing
- Less than 2%wt 6x12 to 30x50 mesh
- Less than 3%wt 40x70 to 70x140 mesh
- High crush resistance - can withstand compressive stresses of 4,000 to 6,000 psi, with resultant maximum fines wt%:
- 20%wt for 6x12 mesh
- 14%wt for 20x40, 16x30 mesh
- 10%wt for 30x50 mesh
- 6%wt for 70x140 mesh
- Turbidity less than 250NTU – this is the amount of silt-clay sized minerals in sand that is usually washed out in the process, but occasionally needs attritioning
If your sand has been tested by an accredited lab and meets the API frac sand requirements, McLanahan can begin designing your plant immediately. If your sand has not yet been tested, our in-house laboratory can perform sieve analysis, as well as attrition and turbidity testing. For other API accredited test work, we can arrange for an accredited lab to perform the complete range of tests.
The various designs of plants may include the following processes featuring McLanahan designed and built equipment:
- Sizing – Screening off the unwanted coarse fractions
- Pumping – Transferring slurry from one plant/process to the next, pressuring Cyclones as part of a classification circuit, or in effluent disposal such as pumping Thickener underflow
- Desliming – Removing the deleterious <200 mesh (75µm) materials prior to classification
- Classifying – Making sharp separations with Hydrosizers™ or Cyclones; typically this might be at 40, 70 and 140 mesh
- Scrubbing – Utilizing Attrition Cells to scrub the surfaces of the particles to improve turbidity
- Dewatering – Applying Fine Material Screws, Dewatering Screens or Separators™
- Effluent Management – Thickeners can be built on the ground or Paste style for recovery of 85% of process water
- Waste Solids Management – Filter Presses to process fine waste solids from Thickener underflow into a cake that can be handled by conveyor or front end loader
- Sampling - Belt and slurry sampling can provide timely insight to the process performance.
Popular Applications for Frac Sand Plants
Every sand deposit that will pass API testing still requires some form of processing to create fractions for drying and discrete sizing into the final frac sand products used in the field.
The equipment is applied as appropriate in a complete system to benefit the yield from the deposit and the quality of the products being produced.
Benefits of McLanahan Frac Sand Plants
- Critical separations are made with field proven, state-of-the-art equipment
- Equipment is specifically designed for industrial sand applications
- Adjustable on-the-run separations
- Lowest moisture content products for shorter stockpile time
- Drier products result in better housekeeping and a safer operating environment
- Highest yield of primary products
- Unmatched process experience for optimized applications
Frequently Asked Questions
Do I need a multi-fraction wash plant?
There is not a simple answer to this question. What you need is the right plant. McLanahan does not have a single solution or an off-the-shelf module that answers every application. Our specialty is in using our in-house expertise and equipment range to create a plant that will help you meet your specification requirements and so that you have a single source contact. It may be that a multi-cut process is the answer; however, limits on available financing, permitting issues, environmental considerations and market changes will significantly influence the decisions.
Why use Hydrosizers™ instead of sizing screens?
Hydrosizers™ have an advantage of a smaller cross sectional area requirement per tph. This translates into a smaller footprint and fewer units required to process the same amount of throughput. The ability to make product specification changes without interrupting the process is an additional advantage, which allows more flexibility. Finally, when making a below 20 mesh cut, screens have much tighter feed condition requirements to ensure proper operation. With a screen, too much water in the feed will cause hydroplaning, while too little water will cause the bypass of material through the clumping of the material.
What flexibility will I have in my plant to make different products?
In general, all equipment has a range of operation, and the McLanahan team will work with site personnel to adjust the existing equipment to achieve the alternative requirements. McLanahan’s ability to provide the full solutions allows a better understanding of the process and allows for easier evaluation and modification to the application.
New applications can be designed with flexibility for the product specification built into the plant.