Simrad PI TRAWL HYDROPHONE - INSTALLATION REV B Installation Manual
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Simrad PI TRAWL HYDROPHONE - INSTALLATION REV B Installation Manual

Simrad PI TRAWL HYDROPHONE - INSTALLATION REV B Installation Manual

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Simrad PI
Catch monitoring system
Trawl hydrophone installation
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Summary of Contents for Simrad PI TRAWL HYDROPHONE - INSTALLATION REV B

  • Page 1 Installation manual Simrad PI Catch monitoring system Trawl hydrophone installation www.simrad.com M A X I M I Z I N G Y O U R P E R F O R M A N C E S E A...
  • Page 3 851-164472 / Rev.B Simrad PI Catch monitoring system Trawl hydrophone installation...
  • Page 4 Simrad AS. The information contained in this document is subject to change without prior notice. Simrad AS shall not be liable for errors contained herein, or for incidental or consequential damages in connection with the furnishing, performance, or use of this document.

  • Page 5: Table Of Contents

    Installation manual Introduction ............Installation precautions .
  • Page 6 Simrad PI Catch monitoring system / Trawl hydrophone 851-164472 / Rev.B...

  • Page 7: Introduction

    Installation manual Introduction The purpose of this document is to provide general guidelines for the installation of the PI hydrophone for trawling. Note: If your vessel shall be fitted for purse seine operations, DO NOT install the hydrophone(s) as explained in this document! Order numbers Trawl hydrophone, complete: HYD-205254 Trawl hydrophone, without cable gland: HYD-205826...

  • Page 8: Installation Precautions

    Simrad PI Catch monitoring system / Trawl hydrophone Installation precautions Caution: The following precautions must be observed. Failure to do so can result in damage to the hydrophone which may render the PI Trawl hydrophone system inoperative. Observe the maximum allowable torque warning of 5 Nm when tightening the hydrophone studs.

  • Page 9: Considerations

    Note: Simrad strongly suggests that this information is read thoroughly, and that the instructions are understood and followed. Proper hydrophone placement is difficult to achieve, but essential for correct system operation.
  • Page 10 Simrad PI Catch monitoring system / Trawl hydrophone Boundary water layers: (A) = Turbulent flow (B) = Laminar flow (C) = Air bubbles in the water Air bubbles may also be introduced into the boundary layer. If the vessel’s hull has little flare and is relatively narrow, bubbles may escape to the sea surface without incident.
  • Page 11 Installation manual Propeller noise A vessel’s main propeller is the dominant source of underwater acoustic noise. When ever possible, hydrophone(s) should be located as far a way as possible from the main propeller and never closer than ten meters. Hydrophone(s) should not be mounted in the direct acoustic path (line-of-sight) of the main propeller unless absolutely necessary.
  • Page 12 Simrad PI Catch monitoring system / Trawl hydrophone When not in operation, bow/sternthruster tunnels create turbulence and hence underwater noise when a vessel is under way. Also, as a vessel pitches in heavy weather, thruster tunnels may fill with air or aerated water which can disturb hydrophone reception when released.
  • Page 13 Installation manual Drop keel In the event the vessel is equipped with a drop keel, the hydrophones should be mounted aft of it. The choice between installing a one, or two hydrophone system should be based on the same horizontal and vertical coverage requirements for vessels operating under similar conditions with fixed keels.

  • Page 14: Pre-Installation Check-List

    To aid in this evaluation process Simrad recommends that this installation manual be read thoroughly and the following check list completed before deciding on a final installation strategy for the PI system.
  • Page 15 Installation manual The hydrophone that is closest to the main propeller should be located on the port side of the vessel and have the greatest tilt. If both hydrophone are located equally distant from the main propeller, but are tilted differently, the starboard hydrophone should be tilted the most because underwater acoustic noise is more prevalent on that side of the vessel.

  • Page 16: Optimal Location Of Trawl Hydrophones

    Simrad PI Catch monitoring system / Trawl hydrophone Optimal location of trawl hydrophones The most influential factors effecting hydrophone reception common to most vessels are: • Noise from cavitation generated by the main propeller. • Air bubbles in the water around the hydrophone which impede acoustic signals.
  • Page 17 Installation manual 1200 mm, but no less than 700 mm) to avoid turbulence. To also aid in reducing the effects of turbulence, hydrophones should be installed as deeply as possible (preferably 600 mm, but not less than 400 mm) from the vessel’s outer hull. When ever possible, the distance from the keel to the bottom of the hydrophone blister should not exceed 50 mm which can be adjusted by countersinking the installation.
  • Page 18 Simrad PI Catch monitoring system / Trawl hydrophone degrees. To maximise coverage using two hydrophones when trawling in both deep and shallow water tilt one preferably 15 degrees and the other preferably 30 degrees. The hydrophone closes to the propeller should be tilted the most and care should be taken with regard to underwater acoustical noise.

  • Page 19: Coverage Area, Orientation And Tilt

    Installation manual Coverage area, orientation and tilt Once the fore-and-aft placement of the hydrophone is decided, it is equally important to carefully consider its horizontal and vertical orientation. Hydrophone orientation can have a large influence on system performance. Hydrophones must be configured so that they overlap one an other in the horizontal plane.
  • Page 20 Simrad PI Catch monitoring system / Trawl hydrophone Vertical coverage area I Dual hydrophone installation with hydrophones equally distant from the bow, but tilted differently. Typical tilt configuration for operation in both deep and shallow water when the hydrophones have the same distance from bow.
  • Page 21 Installation manual Vertical coverage area II Dual hydrophone installation with hydrophones different distances from the bow, and tilted differently. Typical tilt configuration for operation in both deep and shallow water when hydrophones have different distances from bow. (A) = Port hydrophone tilted 20 to 35 degrees (B) = Starboard hydrophone tilted 10 to 20 degrees The hydrophone closest to the main propeller should be on the port side of the hull and have the greater tilt of the two,...
  • Page 22 Simrad PI Catch monitoring system / Trawl hydrophone Simrad recommends that hydrophone tilt be preferably 20 degrees for normal trawling. If the vessel plans to operate in deep water the tilt can be increased to approximately 30 to 35 degrees or reduced to 10 degrees if trawling will be performed at or near the surface.

  • Page 23: Mounting Arrangement

    Installation manual Mounting arrangement The PI trawl hydrophones are delivered ready for installation in either freestanding or keel mounted shoes (which are to be built by the shipyard responsible for the installation). Several alternatives with corresponding detailed drawings have been included in this manual to cover the majority of installation options available.
  • Page 24 Simrad PI Catch monitoring system / Trawl hydrophone Freestanding hydrophones in blisters For trawlers that do not have to take a pursing wire into consideration, hydrophones can be mounted in specially constructed blisters offset from the vessel’s keel (preferably 1200 mm, but no less than 700 mm) to avoid turbulence.
  • Page 25 Installation manual The farther away from the hull a hydrophone is mounted the more the effects of turbulence are reduced. Simrad recommends that hydrophones be installed as deeply as possible (preferably 600 mm, but not less than 400 mm) from the vessel’s outer hull.
  • Page 26 Simrad PI Catch monitoring system / Trawl hydrophone Keel mounted shoes Hydrophones can be keel mounted to avoid creating appendages to the hull that could foul the purse wire. Keel mounted hydrophone shoes, top view. (A) = Keel (B) = Towards the bow...
  • Page 27 Installation manual Mounting at the aft end of a shoe Hydrophones can be mounted at the after end of a transducer shoe for an echo sounder or other underwater acoustic equipment. The distance between the hydrophone and such equipment must not be less than one meter and the greater the separation, the better.
  • Page 28 Simrad PI Catch monitoring system / Trawl hydrophone Mounting at the after end of a bulbous bow Trawling hydrophones have been successfully installed at the after end of bulbous bows (for vessels trawling in deep water and require tilt angles from 25 to 35 degrees). Vessels equipped...

  • Page 29: Dual Hydrophone Installation

    Simrad recommends the use of two hydrophones to ensure the necessary horizontal and vertical coverage for proper system operation. This also allow the respective coverage areas of the...

  • Page 30: Hydrophone Protection

    Simrad PI Catch monitoring system / Trawl hydrophone Hydrophone protection Warning: Do not perform hot work near, paint, scrape, hit, pry, force, sandblast, high-pressure wash or otherwise subject hydrophones to excessive force. Installation precautions The following precautions must be observed. Failure to do so can result in damage to the trawl hydrophone which may render the PI system inoperative.
  • Page 31 Hydrophone face This is Simrad’s list of approved antifouling paints for hydrophone faces. From Jotun Paints, Sandefjord Norway: • Antifouling Seamate HB 33, HB 66 and HB 99 •...
  • Page 32 Simrad PI Catch monitoring system / Trawl hydrophone Location and marking After installation, the location of hydrophones should be clearly marked on the vessel’s hull (above the water-line) directly over them. This information will help prevent hydrophone damage when dry-docking the vessel. It is very important to amend the...

  • Page 33: Hydrophone Cable

    Note: Simrad strongly recommends that a length of conduit be fitted around hydrophone cable glands made of steel or bronze and extended over the water-line inside the vessel. This precaution reduces the danger of flooding in the event of gland failure and hydrophones installed in this manner are also easier to replace.
  • Page 34 Simrad PI Catch monitoring system / Trawl hydrophone Cable gland installation for steel hulls The cable gland kit for steel vessels is included with standard deliveries. The drawing shows a single hydrophone, but normally a typical installation includes two hydrophones with respective cables spliced in a junction box and run to the wheelhouse in a conduit.
  • Page 35 Simrad recommends that a one inch conduit (that the hydrophone cable will be run through) with an inside threaded diameter of three-quarter inches be attached to the gland’s packing nipple. This connection must be watertight, and the conduit must extend to over the vessel’s water line and...
  • Page 36 Simrad PI Catch monitoring system / Trawl hydrophone Cable gland installation for smaller vessels Cable glands made of plastic for those smaller vessels that do njot need to be classified are optional equipment for standard deliveries. This cable gland kit is not included in the standard delivery, and must be ordered separately.
  • Page 37 Cable shielding must be continuous. The shielding is terminated in the cabinet and must not be grounded in the junction boxes. In order to minimize electrical interference, Simrad strongly recommends that the hydrophone cable is installed in a metal conduit between the hydrophone and the PI cabinet.

  • Page 38: Installation Drawings

    Simrad PI Catch monitoring system / Trawl hydrophone Installation drawings Observe the following drawings. The drawings are also available on electronic format (DWG or PDF), consult your local dealer. → PI Trawl hydrophone, outline dimensions, page 33 → PI Trawl hydrophone, cut-out, page 34 →...
  • Page 39 Installation manual PI Trawl hydrophone - Outline dimensions 851--164472 / Rev.B...
  • Page 40 Simrad PI Catch monitoring system / Trawl hydrophone PI Trawl hydrophone - Cut-out - Page 1 851--164472 / Rev.B...
  • Page 41 Installation manual PI Trawl hydrophone - Cut-out - Page 2 851--164472 / Rev.B...
  • Page 42 Simrad PI Catch monitoring system / Trawl hydrophone PI Trawl hydrophone - Mounting flange - Page 1 851--164472 / Rev.B...
  • Page 43 Installation manual PI Trawl hydrophone - Mounting flange - Page 2 851--164472 / Rev.B...
  • Page 44 Simrad PI Catch monitoring system / Trawl hydrophone PI Trawl hydrophone in blister - Arrangement drawing - Page 1 851--164472 / Rev.B...
  • Page 45 Installation manual PI Trawl hydrophone in blister - Arrangement drawing - Page 2 851--164472 / Rev.B...
  • Page 46 Simrad PI Catch monitoring system / Trawl hydrophone PI Trawl hydrophone in keel mounted shoes - Arrangement drawing - Page 1 851--164472 / Rev.B...
  • Page 47 Installation manual PI Trawl hydrophone in keel mounted shoes - Arrangement drawing - Page 2 851--164472 / Rev.B...
  • Page 48 E 2005 Simrad AS ISBN 82-8066-055-0...

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