DM-0397 - Format

Format Description

UKOOA P5/94 Format Description

Executive Summary

The P5/94 format is available to members to facilitate the exchange of pipeline, other subsea flowlines, umbilicals and power cables’ position data.

Use of this format, which is a revision of the P5/86 format is not mandatory but it is strongly recommended that it be used wherever possible.

Comments and suggestions for improvement of the format are welcome and should be addressed to:

The Chairman
Surveying and Positioning Committee
UKOOA
3 Hans Crescent
London SW I X OLN

Introduction

UKOOA format P5/94 is intended to facilitate the exchange of position data for pipelines, flowlines, umbilicals and power cables offshore. (Collectively referred to here as pipelines). It allows the inclusion of some data in addition to pure coordinate data but is not intended to be used as an inventory of pipeline condition.

The data required for pipeline position are the Latitude and Longitude, Easting (E), Northing (N), Depth, Kilometre Point (KP), and feature where applicable, together with coordinate datum and projection parameters.

All coordinates within a file must be in a single coordinate system as given in the header records, i.e. if a pipeline crosses a grid zone boundary then a separate file for each zone is required. Similarly a separate file is required for each pipeline within a zone, i.e. if a feeder line is joined by tee-piece to a gathering line then one file is required for each pipeline.

Header Record Specification

Formats of parameter data fields for each of the header record types are: -

TYPES	ITEM	COLS	FORMAT
H31	"Name of pipeline:" Pipeline name (from - to)	5-21 33-80	A17 A48
H32	"Diameter of pipeline:" Pipeline diameter, e.g. 12 inch	5-25 33-80	A21 A48
H33	"Fluid in pipeline:" Pipeline contents (Oil/gas/condensate/water)	5-22 33-80	A18 A48
H34	"Pipeline operator:" Name of pipeline operator	5-22 33-80	A18 A48
H35	"Date of issue of tape:" Tape issue date (dd mm yyyy)	5-26 33-42	A22 2(I2,X),I4
H36X	"Positioning Contractor:" Details of positioning contractor	5-27 33-80	A23 A48
H37X	"Date of Survey:" Date survey carried out (mm yyyy)	5-19 33-39	A15 I2,X,I4
H38X	"Positioning system:" Description of positioning system	5-23 33-80	A19 A48
H39X	"KP Range for Survey:" KP limits of data for particular survey	5-22 33-48	A18 2F8.3
H40X	"Scale of Digitisation:" Chart scale if coordinates produced by digitisation	5-26 33-80	A22 A48
H411	"KP Origin:" Description KP origin	5-14 33-80	A10 A48
H412	"KP Origin Grid Coords:" KP origin grid coords (East, North) Grid description if different from file	5-26 33-56 57-80	A22 2(F11.2, A1) A24
H413	"KP Origin Lat/Long:" KP origin coords (Lat, Long)	5-23 33-56	A19 2 (I3, I2, F6.3, A1)
H42	"Spheroid:" Definition of spheroid used for data (name, semi-major axis, reciprocal flattening 1/f)	5-13 33-56 57-68 69-80	A9 A24 F12.3 F12.7
H43	"Geodetic datum:" Geodetic datum description	5-19 33-80	A15 A48
H44	"Vertical datum:" Description of vertical datum for water depths (offshore survey) or elevations (onshore survey)	5-19 33-80	A15 A48
H45	"Projection type:" Type of projection	5-20 33-80	A16 A48
H46	"Projection zone:" Projection zone (including hemisphere for UTM)	5-20 33-80	A16 A48
H47	"Grid units: " Description of grid units	5-15 33-56	A11 A24
H48	"Standard parallel(s):" Latitude of standard parallels (d.m.s N/S)	5-25 33-56	A21 2(I3, I2, F6.3, A1)
H49	"Central meridian:" Longitude of c.m. (d.m.s E/W)	5-21 33-44	A17 I3, I2, F6.3, A1
H501	"Grid Origin:" Grid origin (Latitude, Longitude, d.m.s hemisphere)	5-16 33-56	A12 2(I3, I2, F6.3, A1)
H502	"Coordinates at grid origin:" Grid coordinates at grid origin (E, N)	5-31 33-56	A27 2(F11.2, A1)
H511	" Scale factor:" Scale factor at point given in H512	5-17 33-44	A13 F12.10
H512	"Scale origin" Latitude/longitude at which scale factor is defined (d.m.s/hemisphere)	5-17 33-56	A13 2(I3, I2, F6.3, A1)
H526	"Initial line of projection:" Latitude/Longitude of two points defining initial line of projection	5-31 33-56	A27 4(I3, I2, F6.3, A1)
H527	"Bearing of initial line:" Circular bearing of initial line of projection (d.m.s)	5-28 33-44	A24 I3, I2, F7.4
H528	"Bearing of initial line:" Quadrant bearing, of initial line of projection (N/S, d.m.s, E/W)	5-28 33-44	A24 A1, 2I2, F6.3, A1
H529	"Skew angle:" Angle from skew to rectified grid (d.m.s)	5-15 33-44	A11 I3, I2, F7.4
H53	Any other relevant information	5-80	A76
Notes	Columns 1 to 4 of each Header Record are devoted to code for "type" of header e.g. H42, H501 etc. Header "types" H36X to H40X may be repeated to cater for different sections of pipeline surveyed at different times or with different positioning systems, or derived by digitisation. (X in the range 1 to 9) e.g. H361 to H401 may be first survey whilst H362 to H402 may be a second survey etc. H40X should be set to 1 if not applicable. Header record H53 may be repeated as often as necessary.

Data Record Specification

The general format for a data record is as follows:

Item	Description	Cols	Format
1	Record Identification for pipeline = "P"	1	A1
2	Pipeline Identification Number e.g. PL999	2-17	A16
3	Kilometre Post (KP) in kilometres to nearest metre	18-25	F8.3
4	Latitude (d.m.s N/S)	26-35	I2, I2, F5.2, A1
5	Longitude (d.m.s E/W)	36-46	I3, I2, F5.2, A1
6	Map Grid Easting (metres)	47-55	F9.1
7	Map Grid Northing (metres)	56-64	F9.1
8	Water depth in metres to local seabed level (datum defined in header)	65-70	F6.1
9	Feature code	71-73	I3
10	Buried (B) / Exposed (E) Indicator	74	A1
11	Trenched (T) / Untrenched (U) Indicator	75	A1
12	Coordinate accuracy factor (metres)	76-79	I3
13	Blank	80

Notes	Item 3. If KP distances are not computed for a particular pipeline columns 18-25 should be left blank. Item 9. Features are identified by a three figure code as given in list below. Feature code can be extended but only by mutual agreement between parties involved in data exchange. Item 12. An estimate of the absolute accuracy of the surveyed feature should be supplied since this will assist in planning future operations. Positional accuracy will obviously depend on methods employed to survey the pipeline and its features.

Feature Code and Description

Feature Code	Feature Description
000	Pipeline Position
001	Spool Piece
002	500 m point from platform
003	T piece

310	Debris

500	Anode
501	Buckle Arrester
502	Pipe bend
503	Flange
504	Valve
505	Protective structure (igloo)
506	Pipe clamp
507	Mechanical Connector
508	Other pipeline crossing over
509	Other pipeline crossing under
510	Grout Bag Support
511	Grout mattress
512	Anchor or saddle block
513	Remote CP potential monitor
514	Anode assembly (frame anode)

700	Other
701	Anchor scar

800	Field joint

Each feature must be assigned the most relevant code.

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