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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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