squid 2000 seismic source operating manual csp...

SQUID 2000 SEISMIC SOURCE OPERATING MANUAL

CSP-1000-8010/3

SQUID 2000 CATAMARAN

Amended August 2009

Squid 2000 Operation Manual

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Table of Contents

1. Introduction 5 2. Parts Designation SQUID 2000 6 3. Theory of Operation 7 4. Deployment / Connections 9 5. Operational Maintenance 10 6. Maintenance Procedures 11 7. End of Life Recycling / Disposal 12 8. Fault Identification & Rectification 13 9. Technical Specifications 15

Thank you for choosing Applied Acoustic Engineering as one of your subsea equipment suppliers. We hope you experience many years of reliable operational use from our products.

If you do encounter any technical issues with any of our products then please don’t hesitate to

contact our Technical Team via the following methods.

Tel: +44 (0)1493 440355 Fax: +44 (0)1493 440720

Email: [email protected]

Applied Acoustic Engineering Ltd has made every effort to ensure that the information contained in this

manual is correct at time of print. However our policy of continual product improvement means that we cannot assume liability for any errors which may occur.

These written instructions must be followed fully for reliable and safe operation of the equipment that this manual refers to. Applied Acoustic Engineering Ltd cannot be held responsible for any issues arising from the improper use or maintenance of equipment referred to in this manual or failure of the operator to adhere to the instructions laid out in this manual. The user must be familiar with the contents of this manual before use or operation.


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1. Introduction

The SQUID 2000 Sparker is a multi-tipped sound source which produces a broad spectrum signature depending on discharge power and tip arrangement.

The SQUID 2000 is a traditional multi-tipped sparker, with added user flexibility, enabling the source to be ‘tuned’ to various applications.

The SQUID 2000 is designed to operate with our range of Hydrophone arrays (AH Series) and our range of Seismic Power Sources (CSP Series).


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2. Parts Designation SQUID 2000 (Underside View)

TOWING POINTS

SPARKER ARRAY

ELECTRODE MOUNTING

CRADLE


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3. Theory of Operation SQUID 2000

The sound wave is generated by the electrical energy in the capacitors of the CSP discharging across the sparker tips to the earth of the tow-body, through the sea water to produce a pressure wave. The energy density (Joules per m³) can be varied by selecting either 15 tipped or 30 tipped candles. By varying the energy level and density the array can be ‘tuned’, for example to achieve a high resolution source use a greater number of tips spread out to produce a sharp discharge pulse at 300J to 400J. However if greater penetration is required each cluster should have a smaller number of tips to minimise the spread and thus improve the energy density when supplied with higher energy levels typically 500-1500J. With increased energy levels a secondary discharge pulse is generated after the initial discharge. The time delay between initial and secondary is proportional to the level of energy being discharged. The result of the secondary discharge is a ‘ghosting’ effect on the received data usually evident as a secondary seabed. The secondary pulse is commonly known as the ‘bubble pulse’. This effect can have a desired effect by effectively lowering the frequency of the source pulse by further increasing the energy levels producing further ‘bubble pulses’ thereby increasing penetration.


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Typical Squid 2000 Pulse Signature

Vpp= 1.0V Source Level= 1.0(V) x 5(M) = 0.996V/B 5.02(V/B)

-20

-18

-16

-14

-12

-10

-8

-6

-4

-2

0

0 305 611 917 1222 1527 1833 2138 2443 2750 3055 3360 3666 3971

SQUID 2000

1.5KJ

ms 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

V

-1.0

-0.8

-0.6

-0.4

-0.2

0.0

0.2

0.4

0.6

0.8

1.0

16Apr2008 15:23

1.5KJ


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4. Deployment / Connections The Squid 2000 is designed to be connected to the Model SQUID 2000 cable and towed as a boomer catamaran. Two towing ropes should be secured to the catamaran using two stainless shackles on the two points (see diagram). These towropes can provide a degree of steerage by adjusting the tension on each rope. Other adjustments include altering the towing point position (fore and aft) to increase stability of the catamaran. Note: No stress should be applied to the electrical connections whilst the unit is undertow as this may cause failure during operation. Ensure that the CSP power source is switched off and isolated before connecting the cabling or SQUID 2000. Check that all power cables are in good mechanical condition and are fit for purpose before use (this includes the mains power supply lead and earth cable). Note: The black cables attached to the SQUID 2000 connectors are rated at 600 Volts continuous rated load (as stated by the manufacturer on the cable) and 4KV for transient voltage applications. Tape all cable connections together with self-amalgamating tape to prevent the connections becoming separated if locking collars are not available. For correct cable connector type see specification section of this manual. Always operate the system using a reliable earth bond to the ship and the sea. The vessel towing the sparker should have the CSP unit earthed to the ship and the ship should be earthed to the sea. This should be at least 10mm². A reliable sea earth can be achieved by using a length of 10mm² copper cable with 1m stripped bare and immersed in seawater. The cable will need to be weighted to ensure constant contact with the seawater. A quick sea trial should be undertaken to check the floatation characteristics of the sparker underway at roughly 2-3 Knots. If this proves successful, the unit should be checked for electrical continuity before power is supplied to the sparker system. Do not operate the sparker system until the sound source is fully deployed off the ship and avoid turning sharply (confined areas), which would allow the catamaran to come close in to the vessel. The SQUID 2000 does not operate in fresh water.


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5. Operational Maintenance

During the course of a survey the sparker tips will require trimming or replacement, the interval is dependent on repetition rate and power level.

See below table for minimum approximate candle life at various repetition rates and power levels:

POWER REPETITION RATE APPROX. MIN HOURS

OF OPERATION

200J 3PPS 330 HOURS *





* Calculation based upon 200mm candle burn in average salinity / water temperature. * Assuming regular tip trimming to ensure even burn

When tips are eroded, isolate from or switch off the energy source. Trim the sparker tips with a pair of electrical side cutters to equal length before testing. NB As soon as one or a few tips start to wear down, these tips will then were down even faster so equal tip length is important.


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6. Maintenance Procedures Sparker tip trimming and replacement are considered to be consumable items, please contact factory for replacement.

The below procedures are advisory guidelines that are recommended.

Inspection Intervals

Pre-Deployment: The recommended interval for a visual inspection is on every deployment of the sparker.

Monthly: It is recommended that the sparker system is electrically checked.

Visual Inspection (Pre Deployment)

Check condition of RMK connectors verify locking collars are secure.

Check for mechanical damage / insecure fastenings.

Check tips are even in length to ensure that the burn is even. Monthly Inspection (Pre Survey)

Check condition of HV power cable – electrical isolation and continuity of both earth and live connections.

Check condition of RMK connectors for signs of arcing / damage.

Check for mechanical damage / insecure fastenings.

The Applied Acoustic Engineering Squid 2000 unit does not require regular servicing with the exception above operational inspections. When storing for long periods it is recommended the unit is cleaned with fresh water.


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7. Product Recycling / Disposal

Within the EU all electronic components and batteries must be taken for separate collection at the end of their working life under EU WEEE directives. Applied Acoustics as a manufacturer within the EU will responsibly dispose of any returned end of life Applied Acoustics components / batteries through a registered WEEE scheme. In order to prevent uncontrolled waste disposal and promote re-cycling please return any end of life Applied Acoustic components postage paid by sender to our UK head office.

Please contact Tech Support for a RMA number prior to shipping.


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8. Fault Identification and Rectification

Loss of data quality and electrical failure are the main faults that occur as a result of mechanical damage or component failure. These are generally identified by inspection or whilst acquiring sub bottom data.

Periodic replacement of the sparker cluster is considered to be part of the operation maintenance procedure. Exact timing of servicing cannot be predicted as it is dependent on operational conditions.

Below is a simple guide to identifying common faults that can occur.

Symptoms

No data received on hydrophone. Possible Causes

Hydrophone damage.

Mechanical damage / Water Ingress to HV cable / connectors.

SQUID 2000 cabling failure. Solution

Verify operation of hydrophone by tap test / check battery.

Inspect tow cable for mechanical damage. Test for electrical isolation and continuity.

Inspect cabling and connections. Test for electrical isolation and continuity.

Symptoms

Drop in output power or no output upon CSP discharge. Possible Causes

Mechanical damage / Water Ingress to HV cable / connectors.

Mechanical damage / Water Ingress to transducer mouldings.

SQUID 2000 cabling failure. Solution

Inspect tow cable for mechanical damage. Test for electrical isolation and continuity.

Inspect cabling and connections. Test for electrical isolation and continuity.


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Fault Identification and Rectification Continued

Symptoms

Loss of data resolution. Possible Causes

Uneven tip wear.

Hydrophone fault. Solution

Trim sparker tips to ensure even burn and bubble.

Verify operation of hydrophone by tap test / check battery.

Contact factory if new mouldings are required on the SQUID.

Contact factory if new clusters are required for the SQUID.

Tips: If performance is poor, check that all cables or cable connections are electrically secure and sound. (Switch off CSP unit before checking). Ensure that all electrical connections are not arcing or breaking down to water. (Switch off CSP unit before checking). Check that the unit is sitting in the water at the recommended depth (see deployment). Rough sea conditions will cause signal deterioration. Check that the CSP unit power level is set correctly (Do not over drive the unit beyond its rated specification).

Please quote the serial number of the unit and model number when contacting the factory.


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9. Technical Specifications SQUID 2000

Maximum Energy rating : 1500 J Number of sparker tips : 8 sets of 15 (Black Clusters – superceding white clusters) : 8 sets of 30 (Blue Clusters)

Source Level : 224dB re 1uPa at 1M @ 1500J

: 220dB = 1 Bar Meter.

Pulse Width : 0.6mS @ 600J : 0.8mS @ 1500J

Overall length : 1280mm (50½ Inches) Overall width : 91.5mm (36 Inches)

Maximum Height : 670mm (26½ Inches)

Weight : 40 Kg (88 Lbs)

Material : A4 Stainless Steel Tubing & Fixings

: Other parts plastic

Fixings : A4 Stainless Steel, 13 & 10mm : Tooling Supplied


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UK Head Office

Applied Acoustic Engineering Ltd Marine House Marine Park Gapton Hall Road Great Yarmouth NR31 0NB United Kingdom

Tel: +44 (0)1493 440355 Fax: +44 (0)1493 440720

Email

General Enquiries: [email protected] Sales: [email protected] Technical Support: [email protected]

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