What does HDD mean for road construction?
Horizontal Directional Drilling (HDD) has become a favorable method of pipeline installation in urban areas and for crossing obstacles such as rivers and roads. HDD is defined as a steerable system for the installation of pipes, conduits and cables in a shallow arc using a surfacebalanced drilling rig.

What is the horizontal directional drilling HDD technology?
What is horizontal directional drilling? Horizontal Directional Drilling (HDD) is a construction technique whereby a tunnel is drilled under a waterway or other designated area, and a pipeline or other utility is pulled through the drilled underground tunnel.

What is horizontal directional drilling used for?
Horizontal Directional Drilling (HDD) is a method of installing underground pipelines, cables and service conduit through trenchless methods. It involves the use of a directional drilling machine, and associated attachments, to accurately drill along the chosen bore path and back ream the required pipe.

What are the different types of horizontal directional drilling?
Horizontal directional drilling machines are divided into three categories largediameter HDD (maxiHDD), mediumdiameter HDD (midiHDD), and smalldiameter HDD (miniHDD). There is no significant difference in the operation of these systems.

What is an advantage of horizontal drilling?
The two main advantages from horizontal wells are: a. more effective drainage of the reservoir (i.e. increased overall reserves recovery) b. reduced water and gas coning. The drainage of a reservoir is increased by horizontal drilling through increasing the amount of reservoir that is exposed to the wellbore.

What type of pipe for HDD?
Choosing the large diameter pipe material for the HDD method
A pipe can be made of materials like polyethylene, polypropylene, ductile iron, steel, and PVC—essentially anything capable of being pulled through the drill path..

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Description: This Video is the second step to get familiar with a Welding Procedure Specification. How It looks, What are the basic components of WPS? Essential Non Essential variables, From where to pick the data? Comparison of the International Qualifying Standards in relation with the WPS Variables. ASME B 31.3, ASME B31.4, ASME B31.8, API 1104 Comparison of the WPS requirements. Discussion of all modules of a WPS taking a sample example.


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