colour coding.doc

Eddy Current Inspection is a through coating technique for detection of surface cracks/defects much the same as MPI, that has been used for documented inspection of lifting points or other welds

SERVICE GUIDELINES

TITLE

MINIMUM GLOBAL INSPECTION GUIDELINESPOWERWELL SERVICES MANAGEMENT SYSTEM

DOCUMENT NUMBER

GD-GL-PWT-004

BUSINESS UNIT

Power Well ServicesREGION

GlobalFUNCTION

Power Well Testing

OWNER

Global AdvisorAPPROVED

Global HSEQ ManagerJOB REVISION

Global AdvisorREVISION DATE

06-Jan-06REVISION

BREVIEW DATE

PAGE

1 0f 8

Eddy Current Inspection is a through coating technique for detection of surface cracks/defects much the same as MPI, that has been used for documented inspection of lifting points or other welds. This method does not require the weld to be blasted to bare metal for inspection, but depends on good paint to metal bond.

Note: Eddy Current method may not be available in all locations.6. Union Identification and Colour Coding

All equipment will have Alpha-Numeric bands indicating pressure rating, colour bands to indicate hammer union type/fig, and service rating. All wing nuts will be painted to indicate union type/fig.

Note: Equipment that does not have the appropriate colour coding for service, union type/fig, alpha-numeric pressure rating shall NOT be placed in service.

The colour bands are to be 1 or 2 wide (1 wide for elbows, crossovers etc. 2 wide for straight pup joints 3ft or greater in length, pressure vessels etc) placed immediately behind the union. The 2 or 1 colour bands for service, union type/fig may be applied by painting or use of all weather tape. The alpha-numeric pressure rating may be applied by stenciling or use of all weather tape. All alpha-numeric pressure rating is to be applied in a contrasting colour to the background colour. For equipment painted PWS Maroon, this is to be WHITE lettering. For pipework the lettering is to be a minimum of 0.75 inch high for small items (crossovers, elbows), and 1.5 inch high for larger items (pipe, vessels, etc) and placed in minimum of 3 positions around the circumference of the pipe.

Part numbers for the various colour and pressure identification have been set up.

IDENTIFIER

COLOUR

SIZE

SERVICE

H2S/CORROSIVE

GREEN

1.000

2.000

SWEET/STANDARD

NO COLOR

Note: If no Green Band applied pipe is to be treated as Sweet/Standard Service. This should prevent any potential for placing Sweet Service pipe in H2S applications.UNION TYPE/FIG2202

WHITE

1.000

2.000

1502

BLACK

1.000

2.000

1002

RED

1.000

2.000

602

YELLOW

1.000

2.000

206

LIGHT BLUE

1.000

2.000

PRESSUREWhite stenciled MAWP on PWS Maroon background 1440 psigIdentification of union figure of hammer unions that can be mismatched and assembled, must be done by multiple methods. A single method alone cannot be trusted as previous experience has shown that threads can be cut as one figure, but unit stamped as another.The first way of identification is to find the stamped/embossed size, figure and pressure rating information on each component of the union (wing nut, male sub, female sub). See examples below. Shows size and figure

Shows working pressure

Size, Figure and pressure rating stamped into female (thread) sub.

Size, Figure and pressure rating stamped into male (wing) sub.

If any of the components do not have this information visible, then the component is to be removed from service and destroyed.

The second way of identification to be used to verify the information found above is to:

a. Use thread gauges to identify thread type and pitch.

b. Use Go/No Go gauges to identify ID/OD sizes of the wing nut, male sub, female sub (i.e. 2 602 OD is smaller than 2 1502 OD).

c. Physically measure the unions and verify these measurements against manufactures dimensions.

Only once confirmation from both methods has been completed are hammer unions to be colour coded.

Any hammer union that has the potential to be screwed together and mismatched are also to be marked with warning labels. These labels are to be applied to the union end of the unit that has the potential to be mismatched.

Prior to make up of these unions to another union, the connections must be verified, each and every time.

Unions that we may use that can be mismatched are as follows:

2 602 Thread with 2 1502 Wing Nut


2 602 Standard Male Sub with 2 1502 Wing Nut

2 602 Detachable Male Sub with 2 1502 Wing Nut and Segments




Warning label applied to a 2 Fig 602 thread union.

Identification and colour coding of unions is a continuous process and is to be conducted each time maintenance is carried out on a unit. The Global Maintenance Checklists have been updated to include this requirement.Colour Coding of Wing Nuts and Hammer Unions

Figure 206 LIGHT BLUE

Figure 602 - YELLOW

Figure 1002 - RED

Figure 1502 - BLACK

Figure 2202 - WHITE

Below are examples of acceptable and unacceptable ways/locations of applying the colour codes and pressure ratings. Equipment that has multiple pressure ratings (i.e. Tanks inlet/bypass manifold 1440WP, vessel 250psi or 10k x 5k choke manifolds etc), must have each different pressure rated area identified and marked.The MAWP rating of an assembly will be no greater than the MAWP of the lowest pressure rating component used to make up the assembly. (i.e. a 3 sch 80 2,000psi pipe with 3 1502 10k unions will be rated to no more than 2,000psi WP).Acceptable / Not Acceptable CodingAcceptableNot Acceptable

Unions colour coded in correct place, H2S service colour band in place, pressure rating stenciled along the length of the crossover in 3 places around circumference, allowing personnel to see pressure rating no matter the orientation of the crossover.Incorrect wing nut colour (light blue) for male sub colour (yellow). Potential mismatch of unions resulting in catastrophic failure.

Applies to pipe, tees and elbows also.

AcceptableNot Acceptable

Unions colour coded in correct place, H2S service colour band in place, pressure rating stenciled along the length of the pipe in 3 places around circumference, allowing personnel to see pressure rating no matter the orientation of the pipe.Incorrect direction of pressure rating. Pressure rating cannot be seen when pipe in certain orientations.

Applies to elbows, tees and crossovers also.


Unions colour coded in correct place, H2S service colour band in place, pressure rating stenciled along the length of the elbow in 3 places around circumference, allowing personnel to see pressure rating no matter the orientation of the elbowIncorrect positioning of male and female sub colour coding. Colour coding of unions is to be immediately beside union.

Applies to elbows, tees and crossovers also.


Unions colour coded in correct place, H2S service colour band in place, pressure rating stenciled along the length of the tee in 3 places around circumference, allowing personnel to see pressure rating no matter the orientation of the tee.Mixed unions and subs from different manufacturers. Potential mismatch and failure, due to different sizes.

Insert links to examples of vessels etc here7. StencilingAll Power Well Testing equipment will have the QA Trace Number and Safe Working Load, Tare Weight (Payload), Gross Weight stenciled on visible area.

The stencil will be in as large as possible lettering and in contrasting colour (i.e. white lettering on PWS Maroon background) so that it is highly visible.

On skids or frames the QA Trace Number is to be stenciled on four sides, on the upright box beams. The Gross Weight is to be stenciled on one side.

On skids with enclosed tops (separator, heat exchanger, etc) the QA Trace Number and Gross Weight are to be stenciled on the top roof in lettering size that allows these numbers to be easily seen from a distance of 50ft.

QA Trace Number stenciled on roof

QA Trace Number stenciled on uprights of each sideGross Weight stenciled on at least one side

Equipment that does not have frames or skids will have the QA Trace Number and Gross Weight visible by either stencil and/or stamped plate attached to the unit.

Once printed this document becomes uncontrolled, refer to Power Well Services Management System for controlled copy.

colour coding.doc

Documents