Decommissioning and abandonment

58

Decommissioning and abandonment

UO

U-ing, O-ing (SAW method of pipe manufacture) U-ing, O-ing and expanding (SAW method of pipe manufacture)

UOE

UPC URJ

Ultimate pull-in capacity

Upper riser joint United States

US

USA USBL

United States of America Ultra-short base line

UT

Ultrasonic testing or thickness (measurement)

UTA UTH UTM UTS

Umbilical termination assembly Umbilical termination housing

Universal transverse mercator (world projection)

Ultimate tensile strength

UV

Ultra violet

UVCE

Unconfined vapour cloud explosion

V

Vanadium Volt

VI

Visual inspection

VIV viz. VLA VLS VOC

Vortex-induced vibration Videlicit (= namely) Vertical load anchor Vertical lay system Volatile organic content

VP

Vapour pressure

VPR

Vertical production riser Tungsten (formerly Wolfram) Watt West Wide area augmentation system

W

WAAS

WD WF

Water depth

Wave frequency

WGS 84 WHSIP

World Geodetic System 1984 Wellhead shut-in pressure

WI WL

Water injection

Water line Water level

WoS WSA WSD

West of Shetland Wye sled assembly

Working stress design X52, X65, X80 API pipe steel grades XLPE Cross-linked polyethylene YAG

Yttrium aluminium garnet (laser) Yield stress (see SMYS)

YS ' P V eq

Change in pressure Equivalent stress

Hoop stress

V h V l

Longitudinal stress