The Grouting Pressure


For the majority of geotechnical applications except when drilling through clay, a maximum pressure of 7 – 20 bar is normally sufficient to ensure full placement of grout when using simultaneous drilling and grouting. Where pressures  do not exceed these pressure, standard grout pumps with direct mixing and screw pumps (e.g. Metis MAI grout pump M400 NT) are sufficient.

For larger pressures of 20 bar (300 psi), as sometimes needed in clay or larger circulation of grout volumes for dill bit diameter larger then 100 mm, or where grouting is performed as a subsequent operation following drilling, e.g. mining and tunneling, higher pressures are also required. Typically pressures ranging up to 28 bar (400 psi) are sufficient, although pressures upt to 60 bar (860 psi) have been used in some underground applications. For these applications a double action piston pump with volume control should be selected .

As a general rule all grouting equipment, components and hoses must meet hydraulic specifications.


About Metis

Luoyang Metis Mechanical Equipment Co., Ltd.


Metis is a professional self-drilling manufacturer, which adopts the advanced production equipment and strictly quality control system, to ensure that we can provide customers low-cost, and high quality construction materials, so that the equipment used in the construction is safe and efficient. Meanwhile, we devote ourselves to provide clients with a one-stop solution for ground anchor.

Below are our fields of expertise:

  • SDA Bolt
  • Anti-corrosion Rock Bolt
  • IMT Bolt
  • MTS Bolt
  • Anchor Net
  • Rock Drill
  • Injection Pump

These rock bolts are available in a range of sizes and lengths. Also some products can be customized according to customer’s demand. As a rapid and cost-effective solution, the bolts and equipment can be used in a wide variety of projects, such as tunneling support, hydroelectric station, soil nailing, micro piles, mining, and others.

About Metis

2.Brand Competitiveness

  • Powerful EquipmentWe have many advanced machines for rock bolts. Some of them are designed & developed by our ourselves. Now, we have applied for the patent about our machines.
  • Reliable ProductsWe have got the ISO & CE certificates now. And in order to provide reliable products, we have build a set of mature, integral quality control system in the whole process.
  • Excellent ServicesA: Emails will be replied in 8h; All the inquiry & problem will be replied & solved in timely.
    B: 24h on Line; We are on line 24h. Clients’ question will be replied immediately.
    C: After-sales services: If necessary, we can send our engineers to the project site providing installation & operation direction.
  • Technology & InnovationFor providing more safe & efficient products, we are also devoted to the research and development to new products & machines.
  • Professional TeamMetis have a professional, powerful & creative team of marketing, sales, research & development and production team to provide excellent services.

3. Brand Value

  • Profession
  • Innovation
  • Integrity
  • Efficiency