Vertical Shaft Impactor   

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Application of Artificial Sand

V S I Application Video

We, at NCM-SHOAVA Engineers Pvt. Ltd, are immensely proud to have indigenously designed, manufactured, validated and commercialized the Vertical Shaft Impactor (VSI) in India. After designing and validating in 1997, we introduced the first VSI in CONSTRO 1997. Since then we have installed over 85 machines of various capacities.

Application of Vertical Shaft Impactor :
Sand has found its use in construction since ages. Sand or Fine aggregates play an important role in achieving the correct size, shape and mix of concrete and mortar in meeting the standards laid down for the construction Industry.

Natural sand is a result of weathering process followed by collision of rocks over each other for number of years, finally accumulating on the river banks. In modern times the way concrete jungles are mushrooming, the reservoirs of sand, which took many years to develop, are diminishing very fast.

The construction companies are starving of sand. This situation was anticipated well in advance by intellectuals from all over the world, who developed the process of manufacturing sand by mechanical means.


  • . Well graded sand.
  • . Control over particle size.
  • . Converts grit to graded sand.

VSI- 615 (10 TPH)     VSI- 800 (20 TPH)    VSI- 1000 (30 TPH)         

Vertical Shaft Impactor Special Features :

  • 1. Well graded sand.
  • 2. Control over particle size.
  • 3. Rock on Rock crushing, hence minimum wear and tear.
  • 4. Converts grit to graded sand.
  • 5. Slit free sand.

COMPARATIVE COMPRESSIVE STRENGTH ( Based on 28 days, M 150, Concrete Cubes )
( Laboratory Test Results )
Natural Sand 228 Kg/
VSI-Crushed Sand 248 Kg/

Sr.No Description VSI – 615 VSI – 615(S) VSI – 800 VSI – 1000
1 Max Feed Size (-) 10 MM (-) 12 MM (-) 12 MM (-) 15 MM
2 Rotor Dia 600 MM 600 MM 800 MM 1000 MM
3 RPM 2100 2100 1545 1275
4 Rotor Speed 66 M/Sec 66 M/Sec 65 M/Sec 67 M/Sec
5 Electric Motor 30 KW 45 KW 55 KW 110 KW (55 kw * 2)
6 Throughput Capacity 30 TPH 40 TPH 40 TPH 50 TPH
7 Weight of the Machine 3626 KGS 3700 KGS 6000 KGS 11400 KGS
8 Output Capacity (Sand Only) 10 TPH 12 TPH 20 TPH 30 TPH
Q.1 What is the difference in strength of natural sand and artificial sand?

A.1. Compressive strength of M15 concrete cube of 28 days curing is 10 % higher than the natural sand.

Q.2 Is artificial sand acceptable to government authorities?

A.2. Yes, in fact artificial sand is recommended as a good alternative to natural sand. Excessive dredging/extraction of natural sand has been causing environmental hazards and is being gradually banned.

Q.3.Has the artificial sand been incorporated in Indian standard specifications?

A.3. Yes.

Q.4.What is the range of VSI machines offered by NCM SHOAVA Engineers Pvt Ltd?

A.4. We manufacture the following range of VSI machines.

Sr.No VSI Model Production Tons per Hour Production Brass per Hour
1 VSI – 615 10 2.25
2 VSI – 615(S) 12 2.75
3 VSI - 800 20 5.00
4 VSI - 1000 30 5.75 – 6.75

Q.5.What is the power requirement for the VSI machines ?


Sr.No VSI Model Power Requirement kW Power Requirement HP
1 VSI – 615 30 40
2 VSI – 615(S) 45 60
3 VSI - 800 55 74
4 VSI - 1000 112 150

Q.6 What is the correct feed size for the VSI machines?


Sr.No VSI Machine Max Feed Size
1 VSI – 615 0 to 10 MM
2 VSI – 615(S) 0 to 12 MM
3 VSI - 800 0 to 15 MM
4 VSI - 1000 0 to 15 MM

These VSI models are only for production of artificial sand. These should not be used for shaping of coarse aggregates.

Q.7. What will be my conversion cost per brass?

A.7. Refer the VSI calculator.

Q.8. Are these VSI machines grease lubricated or oil lubricated?

A.8. These are grease lubricated machines.

Q.9 What is the availability of service engineers?

A.9. Service Engineers will report on site anywhere in India within 48 hrs.

Q.10. What is the approximate cost of spares per ton of crushing?

A.10. . Rs 5.

Q.11. When should the greasing be done?

A.11. Greasing should be done
          1. During recess time at Lunch/dinner.
          2. Immediately after the shutdown.

Q.12. What is the delivery period?

A.12. 4 to 6 weeks from the date of confirmed order along with advance.

Q.13. Which motor and starter should be used for these VSI machines?

A.13. Any motor of correct capacity and standard make can be used. We recommend ABB or Crompton motors. Any             Starter of correct capacity and standard make can be used. We recommend VFD (Variable Frequency Drive) for VSI             1000 and Star Delta for other models.

Q.14. What maintenance procedures should be followed?

A.14. Operation and Maintenance manual will Our installation team will coach and brief you on all required maintenance             procedures to be followed for better output and long life of the VSI machines.

Q.15. How is the availability and delivery of spares?

A.15. We are the OEM for VSI machines and always have stock of regular consumable spares ready to be delivered on             order.

Q.16. What is the cost of the VSI machines and what are the payment terms?

A.16. Details of the same will be provided in the quotation.