Related Manuals for Simrad PI PURSE SEINE HYDROPHONE - INSTALLATION REV D
Summary of Contents for Simrad PI PURSE SEINE HYDROPHONE - INSTALLATION REV D
- Page 1 Installation manual Simrad PI Catch monitoring system Purse seine 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 3 851-164149 / Rev.D Simrad PI Catch monitoring system Purse seine 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.
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Page 5: Table Of Contents
Installation manual Introduction ............Installation precautions . - Page 6 Simrad PI Catch monitoring system / Purse seine hydrophone 851-164149 / Rev.D...
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Page 7: Introduction
Installation manual Introduction The purpose of this document is to provide general guidelines for the installation of the PI hydrophone for purse seining. Note: If your vessel shall be fitted for trawl operations, DO NOT install the hydrophone(s) as explained in this document! Order numbers Purse hydrophone, complete: HYD-202711 Purse hydrophone, without cable gland: HYD-205075... -
Page 8: Installation Precautions
Simrad PI Catch monitoring system / Purse seine 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 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 / Purse seine 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 / Purse seine 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.
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Page 13: 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 14 Simrad PI Catch monitoring system / Purse seine hydrophone Conduit used to run hydrophone cables in the interior of a vessel’s hull should extend well over its water line. If you install both trawl and purse seine hydrophones, do not confuse the two types. The Trawl hydrophones are...
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Page 15: Optimal Location Of Purse Seine Hydrophones
Installation manual Optimal location of purse seine 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 16: Coverage Area, Orientation And Tilt
Simrad PI Catch monitoring system / Purse seine hydrophone Coverage area, orientation and tilt General Once the fore and aft placement of the purse seine 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. - Page 17 Installation manual Figure 1 Horizontal coverage area The illustration shows a hydrophone installed at an angle of 70 degrees to the vessel’s center line. (A) = The PI hydrophone (B) = The horizontal coverage area Vertical coverage area The hydrophone has a vertical beam width of -30_ and should be tilted so that the most important part of the seine is adequately covered.
- Page 18 Simrad PI Catch monitoring system / Purse seine hydrophone Tilt angle The tilt angle is a function of net length and depth and may be estimated as follows: α = - [arctan (depth/length π) - 15_+ β] α = tilt angle β...
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Page 19: Mounting Arrangement
Installation manual Mounting arrangement The PI purse hydrophone 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 20 Simrad PI Catch monitoring system / Purse seine hydrophone Keel mounted shoes The hydrophone shoe may be keel mounted to avoid creating an appendage to the hull which may foul the purse wire. Keel mounted hydrophone shoe: (A) = Tilt angel...
- Page 21 Installation manual Free standing hydrophone in blister If there is no risk that hull protrusions will be fouled by the purse wire, mounting the hydrophone in a freestanding blister is a viable option. Free standing hydrophone in blister: (A) = Tilt angel (B) = Vertical coverage area (C) = Free standing hydrophone in blister (pipe diameter 200 to 250 mm)
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Page 22: Dual Hydrophone Installation
Simrad PI Catch monitoring system / Purse seine hydrophone Dual hydrophone installation Large vessels and operations requiring a greater than normal coverage area can install two hydrophones with a vertical and horizontal overlap. Hydrophone selection is made with the help of a switch located in the wheelhouse. - Page 23 Installation manual Vertical coverage areas When the seine is normally located forward of the starboard beam when pursing the following information should be taken into consideration: • The optimal tilt angle for dual hydrophone installations is derived in the same manner as a for single hydrophone installations.
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Page 24: Hydrophone Protection
Simrad PI Catch monitoring system / Purse seine 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 purse seine hydrophone which may render the PI system inoperative. - Page 25 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 26 Simrad PI Catch monitoring system / Purse seine 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...
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Page 27: 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 28 Simrad PI Catch monitoring system / Purse seine 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 29 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 30 Simrad PI Catch monitoring system / Purse seine 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 31 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.
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Page 32: Installation Drawings
Simrad PI Catch monitoring system / Purse seine hydrophone Installation drawings Observe the following drawings. The drawings are also available on electronic format (DWG or PDF), consult your local dealer. → PI Purse hydrophone, outline dimensions, page 27 → PI Purse hydrophone, cutout, page 28 →... - Page 33 Installation manual PI Purse Seine hydrophone - Outline dimensions 851-164149 / Rev.D...
- Page 34 Simrad PI Catch monitoring system / Purse seine hydrophone PI Purse Seine hydrophone - Cutout 851-164149 / Rev.D...
- Page 35 Installation manual PI Purse Seine hydrophone - Keel mounted hydrophone, steel hull - Page 1 851-164149 / Rev.D...
- Page 36 Simrad PI Catch monitoring system / Purse seine hydrophone PI Purse Seine hydrophone - Keel mounted hydrophone, steel hull - Page 2 851-164149 / Rev.D...
- Page 37 Installation manual PI Purse Seine hydrophone - Keel mounted hydrophone, steel hull - Page 3 851-164149 / Rev.D...
- Page 38 Simrad PI Catch monitoring system / Purse seine hydrophone PI Purse Seine hydrophone - Keel mounted hydrophone, wooden hull - Page 1 851-164149 / Rev.D...
- Page 39 Installation manual PI Purse Seine hydrophone - Keel mounted hydrophone, wooden hull - Page 2 851-164149 / Rev.D...
- Page 40 Simrad PI Catch monitoring system / Purse seine hydrophone PI Purse Seine hydrophone - Keel mounted hydrophone, wooden hull - Page 3 851-164149 / Rev.D...
- Page 41 Installation manual PI Purse Seine hydrophone - blister installation on steel hull - Page 1 851-164149 / Rev.D...
- Page 42 Simrad PI Catch monitoring system / Purse seine hydrophone PI Purse Seine hydrophone - blister installation on steel hull - Page 2 851-164149 / Rev.D...
- Page 43 Installation manual PI Purse Seine hydrophone - blister installation on steel hull - Page 3 851-164149 / Rev.D...
- Page 44 E 2005 Simrad AS ISBN 82-8066-054-2...
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