Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
Substance
Definition(s)
Substance
The OSPAR Guidelines for Completing the HOCNF define substance: an element and its chemical compounds in natural form or as a result of a process, including added material needed to make the compound stable, and including contaminants from the production process, but excluding solvents which can be separated without interference with the substance’s stability or without altering the substance’s properties. Substances were previously also called components. Source: Guidelines Regarding the Activities Regulations, Norway, updated December 2012. Regulatory GuidanceSubstance
Substance includes a thing that is an organic material, whether living or not. Source: Health and Safety in Employment Act 1992, Public Act 1992 No 96, New Zealand, as of 1 July 2011. LegislationSubstance Hazard Index
Definition(s)
Substance hazard index (SHI)
The substance hazard index (SHI) is an index developed to identify objectively the toxic chemicals or substances that could be involved in a catastrophic release. The index is a simple function of vapor pressure and toxicity: the higher a substance’s vapor pressure, the more readily it will enter the atmosphere in the event of a release. The greater a substance’s toxicity, the lower the concentration required to present a hazard, and the higher its SHI. A more detailed definition, along with an illustrative list of substances and their SHIs, is presented in Appendix C. Source: API RP 750, Management of Process Hazards, First Edition, January 1990. Global StandardsSubstances that are Harmful to Reproduction and Mutagenic
Definition(s)
Substances that are Harmful to Reproduction and Mutagenic
Substances that are harmful to reproduction and mutagenic, mean mutagenic categories (Mut) 1 and 2 and reproduction categories (Rep) 1 and 2, cf. Appendix 1 to the Regulations regarding labelling etc. of hazardous chemicals or self classification (in Norwegian only). Source: Guidelines Regarding the Activities Regulations, Norway, updated December 2012. Regulatory GuidanceSubstandard Acreage
Definition(s)
Substandard Acreage
Less acreage than the smallest amount established for standard or optional drilling units. Source: Oil and Gas Division, Texas Administrative Code, Title 16, Chapter 3, February 2013. RegulationsSubstandard Ship
Definition(s)
Substandard Ship
A ship whose hull, machinery, equipment or operational safety is substantially below the standards required by the relevant convention or whose crew is not in conformance with the safe manning document. Source: IMO resolution A.1052(27), Procedures for Port State Control, 2011, 201 December 2011, International Maritime Organization. Regulatory GuidanceSubstantial Corrosion
Definition(s)
Substantial Corrosion
Substantial corrosion is wastage of individual plates and stiffeners in excess of 75 per cent of allowable margins, but within acceptable limits. Source: Rules and Regulations for the Classification of Mobile Offshore Units, Part 1, Regulations, June 2013, Lloyd’s Register, Global StandardsSubstantial Corrosion
Extent of corrosion such that assessment of corrosion pattern indicates wastage in excess of 75% of allowable margins, but within acceptable limits Source: Rules for Classification – Offshore units, DNVGL-OU-0101, Offshore drilling and support units, DNV GL, July 2015. Global StandardsSubstantial Modification
Definition(s)
Substantial Modification
Substantial modification of a marine diesel engine means: .1 For engines installed on ships constructed on or after 1 January 2000, substantial modification means any modification to an engine that could potentially cause the engine to exceed the applicable emission limit set out in regulation 13. Routine replacement of engine components by parts specified in the Technical File that do not alter emission characteristics shall not be considered a “substantial modification” regardless of whether one part or many parts are replaced. .2 For engines installed on ships constructed before 1 January 2000, substantial modification means any modification made to an engine which increases its existing emission characteristics established by the Simplified Measurement method as described in 6.3 in excess of the allowances set out in 6.3.11. These changes include, but are not limited to, changes in its operations or in its technical parameters (e.g., changing camshafts, fuel injection systems, air systems, combustion chamber configuration, or timing calibration of the engine). The installation of a certified Approved Method pursuant to regulation 13.7.1.1 or certification pursuant to regulation 13.7.1.2 is not considered to be a substantial modification for the purpose of the application of regulation 13.2 of the Annex. Source: Resolution MEPC.177(58), amendments to the Technical Code on Control of Emission of Nitrogen Oxides from Marine Diesel Engines, 10 October 2008, International Maritime Organization. Regulatory GuidanceSubstantial Repair or Alteration
Definition(s)
Substantial Repair or Alteration
A substantial repair or alteration means any repair and/or alteration carried out, which may, in the opinion of an inspection body, affect the primary elements of the offshore container, or elements which contribute directly to its structural integrity. Source: NOGEPA Industrial Guideline No. 02, Offshore Containers, Netherlands, Revision 4, January 2006. Global StandardsSubstantially Interested State
Definition(s)
Substantially Interested State
Substantially interested State means a State: .1 which is the flag State of a ship involved in a marine casualty or marine incident; or .2 which is the coastal State involved in a marine casualty or marine incident; or .3 whose environment was severely or significantly damaged by a marine casualty (including the environment of its waters and territories recognized under international law); or .4 where the consequences of a marine casualty or marine incident caused, or threatened, serious harm to that State or to artificial islands, installations, or structures over which it is entitled to exercise jurisdiction; or .5 where, as a result of a marine casualty, nationals of that State lost their lives or received serious injuries; or .6 that has important information at its disposal that the marine safety investigating State(s) consider useful to the investigation; or .7 that for some other reason establishes an interest that is considered significant by the marine safety investigating State(s). Source: IMO Resolution MSC.255(84), Code of the International Standards and Recommended Practices for a Safety Investigation into a Marine Casualty or Marine Incident (Casualty Investigation Code), 16 May 2008, International Maritime Organization. Regulatory GuidanceSubstantive Change
Definition(s)
Substantive Change
Change that potentially affects the performance or rating of the tool in the intended service as evaluated by a qualified person at the supplier/manufacturer.
Source:API SPECIFICATION 19TT, Specification for Downhole Well Test Tools and Related Equipment, First Edition, October 2016. Global Standards