Monday, 20 November 2017

Conductor Pipe Hammers

Conductor Pipe Hammers Types

Conductor pipe hammering
Conductor pipe hammering
Conductor Pipe (CP) is necessary to provide a riser and flow path for drilling mud from the well to the surface pit system. The outside diameter and the wall thickness of conductor pipe should be chosen according to previous experiences in the area and the selected casing profile.

Conductor Pipe can be installed either by driving with a pile hammer or by pre-drilling a hole and cementing.

Conductor Pipes Pile Hammers

Diesel pile hammers are used for surface driving operations on conductor pipe. The driving depth of the conductor pipe is a function of the sediments in the ground.

The most common used system is the ‘Delmag - D44 or D46’ which has a hammer weight of 18t with a variable delivery fuel pump. Below table, shows the specifications of others types of Delmag Hammers. The Manufacturer's Operating Procedures must be followed when planning driving operations.


Delmag Diesel Hammer Specifications
Delmag Diesel Hammer Specifications


Typical Diesel Pile Hammer
Typical Diesel Pile Hammer


Below table, shows the normal and maximum blows/ft for different Conductor Pipes and different hammer sizes.
Blows/ft for Various CPs and Hammers
Blows/ft for Various CPs and Hammers

Conductor Pipe Hydro-Hammer

Frank’s S-90 Hydrohammer
Frank’s S-90 Hydrohammer
The Frank’s Hydro-hammer is an ‘intelligent hammer’ due to the sophisticated electronic control design. This control system is capable of regulating the energy for each impact.

The net energy applied to the pile, which is measured during every blow, is monitored and can be regulated from the maximum to 5% or less. Since the measure of energy is precisely known, the force applied to the pile can be accurately computed.

One particularly unique advantage of the Hydrohammer is the control system’s ability to shut off the ram automatically if the pile starts to run ahead of the hammer in soft soils, e.g. due to:

  • The hammer is not positioned correctly on the pile.
  • Stroke rate becoming too high.
  • Blow energy is too high.

Other advantages unique to this hydraulic hammer are:

  • It can operate at any angle, even horizontally.
  • It has an optional printer available to produce a report of the piling operation.
  • It can be used onshore or offshore, in air or submerged under water.

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