Gran100

This is a portable rig capable of drilling upto 100m borehole
It is hydraulic driven with a diesel engine of 12hp
and an Eaton vane pump

It has a sturdy rotary head capable of carrying upto 2,800 kilograms of weight
Fitted with a hydraulic ram giving it a pullback of 2.5 tons

Its rotary head has a ration of 3:1 with a maximum of 200rpm this can be made high if the rig is to be used for geotechnical works where coring is required. The rig comes with 2m long drill rods

It has a sturdMud pump or compressor is not included when buying it however arrangements can be made if any is required This rig can easily be mounted on a pick up. Additional fee is charged for extra accessories

Gran100 drilling rig is the best rig where performance is required.
Reach us for a quotation today

GRAN100 Borehole Drilling Rig – Technical Specifications and FAQs

  1. General Description
    • Model: GRAN100
    • Manufacturer: GRANFI LTD
    • Machine Type: Portable borehole drilling rig
    • Maximum Drilling Depth: 100 meters
    • Designed for light to medium-duty borehole drilling
  1. Drilling Capability
    • Drilling Methods:
    o Air drilling (DTH – Down-The-Hole hammer)
    o Mud rotary drilling
    • Drilling Diameters:
    o 6 inches – Air drilling (standard bore)
    o 7 to 8 inches – Mud drilling (via reaming)
    • Suitable for:
    o Water wells
    o Rural and community boreholes
    o Farm irrigation systems
  1. Structural Design
    • Mast Type: Vertical steel mast (guide tower configuration)
    • Frame: Heavy-duty mild steel fabrication
    • Base: Reinforced chassis (skid or trolley adaptable)
    • Mounting Options:
    o Trolley-mounted
    o Vehicle-mounted (e.g., Land Cruiser, pickup)
  1. Feed & Hoisting System
    • Feed Mechanism: Hydraulic push/pull system
    • Main Cylinder: Vertical hydraulic cylinder for lifting and feed
    • Auxiliary Cylinder: Inclined stabilizer/tilt cylinder
    • Functions:
    o Raising and lowering drill rods
    o Applying controlled weight-on-bit
    o Stabilizing mast during operation
  1. Rotation System
    • Rotary Head: Hydraulic or mechanically driven
    • Provides torque for:
    o Rotary mud drilling
    o Driving DTH hammer (air drilling support)
  1. Hydraulic System
    • Type: Multi-cylinder hydraulic system
    • Controls: Manual hydraulic valve bank
    • Functions:
    o Mast lifting
    o Feed control
    o Structural stabilization
  1. Power System
    • Typically powered by:
    o Diesel engine (field standard) or
    o External hydraulic power pack
    • Supports:
    o Rotation system
    o Hydraulic actuation
  1. Mobility & Deployment
    • Portable and compact design
    • Can be:
    o Mounted on a trolley for short-distance movement
    o Installed on a vehicle (Land Cruiser/pickup) for field operations
    • Ideal for:
    o Remote locations
    o Off-road drilling environments
  1. Supporting Equipment (Required)
    To operate effectively, the rig works with:
    • Air compressor (for 6” air drilling)
    • Mud pump system (for 7–8” mud drilling)
    • Drill rods and bits (DTH hammer or tricone/drag bits)
  1. Key Features
    • Dual drilling capability (air + mud)
    • Variable bore diameter through reaming
    • Compact, mobile, and field-ready
    • Low setup and transport cost
    • Adaptable to mixed geological formations
  1. Advantages
    • Excellent for Kenyan geology (mixed soil + hard rock)
    • Cost-effective for small drilling contractors
    • Easy to mobilize compared to truck-mounted rigs
    • Flexible drilling diameter depending on method used

🧠 Engineering Insight
The drilling diameter configuration is particularly strategic:
• 6” (Air drilling):
o Faster penetration in hard rock
o Lower energy losses
o Ideal for deep sections
• 7–8” (Mud drilling via reaming):
o Used for surface casing zones
o Improves borehole stability
o Allows installation of larger casing
👉 This combination makes the GRAN100 a highly practical hybrid rig, capable of handling:
• Overburden (mud drilling + reaming)
• Hard rock (air drilling with DTH)

⚠️ Operational Limits
• Maximum efficient depth: ~100 m
• Not suited for:
o Large-diameter (>8”) boreholes
o Heavy industrial or deep (>150 m) drilling

Why GRAN100?
The GRAN100 is a portable, vehicle-mountable borehole drilling rig capable of drilling up to 100 meters, with 6-inch air drilling and 7–8 inch mud drilling (reamed), making it ideal for small to mid-scale water projects in varied ground conditions.

How Expensive is it?
Bare rig without rods and compressor will cost between Kshs.800,000 to Kshs.1,500,000
💡 Why cheaper?
• Locally fabricated (GRANFI)
• No import duty/shipping
• Simpler hydraulic system

To actually operate the rig (air + mud), you need:
A. Air Drilling System (for 6” holes)
• Air compressor (18–25 bar):
👉 KES 1.2M – 2.5M
B. Mud Drilling System (for 7–8” reaming)
• Mud pump: KES 150K – 400K
• Mud tank + hoses: KES 50K – 150K
C. Drill String & Tools
• Drill rods: KES 150K – 400K
• DTH hammer + bits: KES 200K – 500K
• Reamer bits (7–8”): KES 80K – 200K
D. Support Equipment
• Winch / hoist accessories: KES 50K – 150K
• Tools, spares, fittings: KES 50K – 100K