About Down-the-hole drilling rig National IV emission standards
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6 FAQs about [Down-the-hole drilling rig National IV emission standards]
What emission reduction techniques can be used during construction & drilling?
Emission reduction techniques that may apply during construction and drilling include selecting engines such as recently-available diesel engines with lower emissions or natural gas engines. Tech-nology in this area is continually changing.
Do rigs need a Category IV inspection?
Category IV inspections are required for rigs that are disassembled for transport from one drilling location to another drilling location, such as those used on fixed platforms or tension-leg platforms.
Should state air quality control agencies be notified during construction and drilling?
It is important that State air quality control agencies be notified of planned operations during construction and drilling. Emission reduction techniques that may apply during construction and drilling include selecting engines such as recently-available diesel engines with lower emissions or natural gas engines.
How do engine manufacturers meet Tier 4 emission standards?
To meet these Tier 4 emission standards, engine manufacturers will produce new engines with advanced emission control technologies. Because the emission control devices can be damaged by sulfur, we have also adopted requirements for in-use diesel fuel to decrease sulfur levels by more than 99 percent.
What are the survey requirements for a classed drilling system?
Surveys of classed systems are based on the classification designation and the listing of the equipment on the unit’s survey status. All requirements apply where all drilling systems covered in this Guide are classed. Where class has been adjusted to one or more sub notations per 1-2/3, periodic surveys of the applicable systems will apply.
What is the commissioning date of a drilling system?
For purposes of this Section, the commissioning date of the drilling system will be the date on which a Surveyor issues an Interim Class Certificate for the drilling unit with the applicable CDS notation. Surveys of classed systems are based on the classification designation and the listing of the equipment on the unit’s survey status.


