General information and the need to assess the volume of goods in the pile by stockpile survey using a 3D laser total station

Companies and industrial corporations often store bulk goods in warehouses or open-air yards in the form of large piles. For purposes such as planning for commercial and production activities, financial statements, information for credit agreements; commercial forecasting, periodic inspection activities, quarterly/monthly/yearly summary reports of the factory to the Board of Directors...we always have the need to accurately determine the volume of the piles (raw materials) production materials, semi-finished products or finished products). However, with a large amount of goods in the pile (from tens to hundreds of thousands of tons), weighing to determine the volume becomes inconvenient, takes time, manpower, equipment (excavators, trucks, etc.) and accordingly no cost savings. To overcome these disadvantages of weighing, Stockpile survey by ITVC's 3D Laser equipment is used effectively and popularly. Stockpile survey is a technique to measure the volume and mass of goods stacked in a pile. This is a technique of using 3D laser total station equipment (Total station laser 3D Theodilite) to survey and determine the volume of piles based on software built and developed by ITVC. The density of goods is determined through sampling by vacuum sampling equipment (Vacuum Deep Sampler) or by specialized sampling devices. The Stockpile survey method is now widely used in many countries such as Malaysia, Thailand, India, China, Indonesia, Australia and Vietnam. Stockpile survey is a technique to measure the volume and mass of goods stacked in a pile. This is a technique of using 3D laser total station equipment (Total station laser 3D Theodilite) to survey and determine the volume of piles based on software built and developed by ITVC. The density of goods is determined through sampling by vacuum sampling equipment (Vacuum Deep Sampler) or by specialized sampling devices. The Stockpile survey method is now widely used in many countries such as Malaysia, Thailand, India, China, Indonesia, Australia and Vietnam. Stockpile survey is a technique to measure the volume and mass of goods stacked in a pile. This is a technique of using 3D laser total station equipment (Total station laser 3D Theodilite) to survey and determine the volume of piles based on software built and developed by ITVC. The density of goods is determined through sampling by vacuum sampling equipment (Vacuum Deep Sampler) or by specialized sampling devices. The Stockpile survey method is now widely used in many countries such as Malaysia, Thailand, India, China, Indonesia, Australia and Vietnam. The density of goods is determined through sampling by vacuum sampling equipment (Vacuum Deep Sampler) or by specialized sampling devices. The Stockpile survey method is now widely used in many countries such as Malaysia, Thailand, India, China, Indonesia, Australia and Vietnam. The density of goods is determined through sampling by vacuum sampling equipment (Vacuum Deep Sampler) or by specialized sampling devices. The Stockpile survey method is now widely used in many countries such as Malaysia, Thailand, India, China, Indonesia, Australia and Vietnam.

EODR (3D Laser Theodolite) Verification System

- Laser Motorized Reflectorless Theodolite with extended measuring range.

- Calibration Charts software

3D Laser Total Station TPS Leica

Specifications of the Leica Laser 3D Theodolite

- Non-explosive survey range – 2,000 meters

- Prism Range – 10.000 mét

- Accuracy of altimeter and length measurement 2mm + 2ppm/km

- Laser spot size 2cm at a distance of 50m

- Angle measurement accuracy - 0.0003 degrees

- Point measuring speed: Up to 30 points/minute

- Internal memory capacity - 64 Mb

- Electronic level compensation bridge (automatic balance adjustment)

International recognition of the method/legal basis

- The inspection is carried out according to the guidance of ISO7507 method (BS7723) part 4 (Internal) and part 5 (External).

- Method is registered and recognized by NATA

- The laser device uses a safe battery and does not pose a risk of harm to people in the area where the assessment is conducted. However, activities related to fire and explosion should be strictly prohibited during the inspection.

STOCKPILE SURVEY - STOCKPILE SURVEY

The stockpile survey using Stockpile survey is applied to all piles of any shape provided that the entire surface of the pile is visible/surveyed (not masked). . The process of surface surveying (surface scanning) using laser equipment in the field is carried out according to the program, the obtained data will be automatically saved in the device's memory/memory card according to the Data logger/data procedure. collector. The received data is a digital signal that includes the following information:

- Distance from the survey point to the default "0" point in the machine

- Measurement of the angle created by the laser with the horizontal and vertical directions.

- Elevation of the test point relative to the horizontal plane.

This data is entered into the computer and processed by a program built and developed by ITVC. The program will reconstruct the entire actual shape of the pile, on that basis, combined with the built-in algorithms, the program will accurately calculate the volume of the pile. The average density of goods is determined at the actual site through checking representative samples taken by vacuum sampling equipment or other specialized sampling devices. The mass of the stack is calculated by multiplying the volume by the density of the cargo just collected.

Notes:

a) Determining the density of the cargo at the field: The density of the cargo is determined by examining a representative sample taken at random from the pile under investigation. The equipment used is a vacuum sampler, a standard volumetric sample container, and a weighing scale. In the case of goods of non-uniform sizes, a truck with a standard size/geometry can be used as a means of density survey. Goods are picked at random at many points and then loaded onto trucks and then weighed to determine the weight. From the obtained mass combined with determining the actual volume of the trunk, we will calculate the density of the cargo.

b) In this case, the density of the cargo under investigation is limited to the surface layer only. After loading/unloading in the truck, the tightness of the goods is changed, leading to the error of the obtained density. To overcome this shortcoming, the density test was carried out many times at many different locations and averaged the density results of the tests to calculate the weight of the pile.

c) Actual shape of the pile is reconstructed by Topographic Survey software using survey data of 3D Total Station laser total station and the volume is calculated by Civil cad software.

d) The mass of the pile is calculated by multiplying the volume by the average density obtained through the actual survey.

e) All information about the pile and the boundary between the piles is declared by the customer before conducting the inspection.

f) The descriptions of the goods in the inspection report are based on the customer's declaration and are not ITVC's certification of the type/name/grade of the goods.

g) During the inspection, the goods must not be moved/unloaded. If movement/unloading activities occur at the surveyed pile, the inspection must be performed again. The loading/unloading/moving of goods will be done normally when ITVC finishes the inspection process.

h) All elementary layers are considered to be planar.

i) All information about the goods in the pile and the boundary between the piles is declared by the customer before conducting the inspection.

j) Do not carry out inspection of outdoor piles when it rains.

k) The weight of the cargo in the pile shown in the report is the weight of the cargo at the time of inspection as specified in the report (by date/time) and does not reference/relate to any other factors .

3D geometry of stockpile survey stockpile survey

Accuracy of determining the weight of goods in a pile by stockpile survey using a 3D laser total station

With the characteristics of the method described above along with the reference/summary of customer feedback through specific inspection cases, the error of mass of the stockpile survey can be achieved. is +/-1% for a high-uniformity-size row-in-heap and +/-3% for a low-uniformity heap.

Features of stockpile survey using 3D laser total station

- The survey data of the pile surface obtained in the field by using the total station TPS (3D laser theodolite) is a collection of survey points with very high accuracy in terms of distance, angle and elevation of the point. check. This data is automatically stored in the machine's memory, so there is no human error in recording and transferring data.

- The volume of the pile is given thanks to the professional graphics and data processing program, so the accuracy is very high

- The density of the goods is calculated through checking representative samples taken by high-tech sampling equipment (sampling by vacuum method) so it can be taken in layers from top to bottom. that the test sample is purely representative of the stack.

- This method is applicable to determining the volume of goods in a pile of many types of materials and goods such as scrap iron and steel, cast iron, ores of all kinds, clinker, loose cement, sand, limestone, and agar high quality, clay, agricultural products (cashew, rice, wheat, corn, wheat...) chopped wood, coal of all kinds...

- With this technique, we can determine the mass of piles of all different shapes.

- No need to weigh, quickly and safely, portable equipment has high mobility, so we can determine the mass of very large piles (several tens of thousands of tons) in a short time, saving money. time and cost.

To request the Stockpile survey service  - Contact ITVC Global to receive useful advice and the best service.