Decommissioning and abandonment

54

Decommissioning and abandonment

MSV

Multi-support vessel

N

North Northing Number Nitrogen

N° N 2

NA

Neutral axis

NACE NAD27

National association of corrosion engineers

North American Datum 1927

NAM

Nederlandsche Aardolie Maatschappij (Dutch Petroleum Company) Nieuw Amsterdams Peil (Dutch land survey height datum) Non-destructive examination (see NDT) Non-destructive testing (AUT or radiography) Neodymium

NAP

Nd

NDE NDT

NE

North east

NFPA NGL NGO

National fire protection association

Natural gas liquid

Non-governmental organisation

NH 3 NNF

Ammonia

Normally no flow

NORSOK

Norsk Sokels Konkurranseposisjon (Norwegian Contracting Guidance and Standards)

NPSH

Net positive suction head Normally unattended installation

NUI

NWECS (UK)

Northwest European continental shelf (United Kingdom)

NW

North west

O&M

Operations and maintenance

OCIMF

Oil companies international marine forum

OD

Outer diameter Ordnance datum

ODN

Ordnance datum Newlyn (UK land survey height datum) Organization of Petroleum Exporting Countries Out of straightness (pipeline survey) Oil and Pipelines Agency (UK) Operating expenditure (through-life costs) Overall heat transfer coefficient Operating

OHTC OPEC OOS OPA OPEX ORQ OTDR PA 11 PCPT PCR op. OS

Oil rig quality (wire rope) Offshore standard

OSGB 36

Ordnance Survey of Great Britain 1936 triangulation

Optical time-domain reflectometry

Polyamide 11 (Nylon)

Piezometer cone penetration test (see CPTU)

Pipeline cost reduction

PD

Positive displacement (flow meters) Published document (BSI) Pipeline defect assessment manual Probability density function

PDAM

PDF PDQ

Production, drilling and quarters (platform area s)

PE

Polyethylene