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Simrad PI Catch monitoring system / Trawl hydrophone

22

851--164472 / Rev.B

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
in this manner may experience signal loss in heavy weather due
to bubbles or when pounding lifts the hydrophone out of the
water. Normally these types of interruptions are short and sensor
signals can be again received once the hydrophone(s) is
immersed.

Mounting the hydrophone (A) at the after end of a bulbous bow.

Hydrophones installed at the after end of bulbous bows should
be tilted and oriented horizontally as explained in the
corresponding sections of this manual. It is recommended that
other underwater acoustic equipment not be installed together
with the hydrophone(s).

Содержание PI

Страница 1: ...Simrad PI Catch monitoring system Trawl hydrophone installation Installation manual 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 A T S E A www simrad com ...

Страница 2: ......

Страница 3: ...851 164472 Rev B Simrad PI Catch monitoring system Trawl hydrophone installation ...

Страница 4: ...mages in connection with the furnishing performance or use of this document The equipment to which this manual applies must only be used for the purpose for which it was designed Improper use or maintenance may cause damage to the equipment or injury to personnel The user must be familiar with the contents of the appropriate manuals before attempting to operate or work on the equipment Simrad AS d...

Страница 5: ...on precautions 2 Considerations 3 Pre installation check list 8 Optimal location of trawl hydrophones 10 Coverage area orientation and tilt 13 Mounting arrangement 17 Dual hydrophone installation 23 Hydrophone protection 24 Hydrophone cable 27 Installation drawings 32 ...

Страница 6: ...Simrad PI Catch monitoring system Trawl hydrophone IV 851 164472 Rev B ...

Страница 7: ...OT install the hydrophone s as explained in this document Order numbers Trawl hydrophone complete HYD 205254 Trawl hydrophone without cable gland HYD 205826 Topics Precautions page 2 Considerations page 3 Pre installation checklist page 8 Location page 10 Coverage area orientation and tilt page 13 Mounting arrangement page 17 Dual hydrophones page 23 Hydrophone protection page 24 Hydrophone cable ...

Страница 8: ...drophone studs 2 Use only M8x35 socket countersunk head screws for mounting the hydrophone 3 Secure threaded hydrophone hardware with Loctitet 270 or the equivalent 4 Do not paint the hydrophone 5 Do not sand blast power or steam wash the hydrophone 6 Do not scrape the hydrophone with metal or other hard objects that may damage the polyurethane sheathing 7 Do not strike the hydrophone 8 Do not exp...

Страница 9: ...ich they absorb and reflect such energy vary but in some cases they can block hydrophone reception It is therefore recommended to mount the unit as deep as possible Pounding danger When a vessel is in ballast and pitching in heavy seas it is important that the hydrophone is not lifted out of the water Should a vessel pound so heavily that the hydrophone be exposed sound reception will be interrupt...

Страница 10: ...at hull with minimal deadrise is prone to trapping air bubbles no matter how little flare it has Regardless of a vessel s hull form hydrophones are generally recommended to be installed on the forward part of the hull to minimising the influence of both turbulence and air bubbles Bulbous bow The bulbous bow may be an acceptable hydrophone location Should this position be chosen the foremost part o...

Страница 11: ...he negative effect of cavitation noise on hydrophone performance installation is generally recommended as follows Single hydrophone if only one hydrophone is to be installed on a vessel with a clock wise rotating propeller it should be located on the port side of the hull Dual hydrophones if two hydrophones are to be installed they should be placed on either side of the vessel s keel When in doubt...

Страница 12: ...rotruding from the hull Equipment such as sonar hydrophones and pitot tubes Sea chests Overboard discharges Dents in the hull All appendages to the hull indentations and pipe outlets are potential sources of underwater noise They may act as resonant cavities amplifying noise at certain frequencies create cavitation or turbulence Hydrophones should not be located in the vicinity of such objects and...

Страница 13: ...l 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 ...

Страница 14: ...ers A separation of less than ten meters can reduce system range significantly 4 If thrusters are installed hydrophones should be located at least four meters from them 5 Avoid locating hydrophones behind thrusters where air bubbles from their tunnels generated when the vessel pounds can block sensor signals 6 Hydrophone should not be placed forward of other underwater acoustic equipment and prefe...

Страница 15: ...vertical plane 15 Hydrophones installed in blisters should be located away from the vessel s keel and as deep as possible on the hull 16 Hydrophones installed in shoes along the vessel s keel should be mounted as deeply as possible 17 Hydrophone cables that are run in conduit along the outside of the vessels hull should be arranged as to produce the least amount of underwater acoustic noise as pos...

Страница 16: ...e installation requirements contradict one an other and only an in depth knowledge of the principles involved can aid in deciding which should be given priority General rules of thumb Although individual vessel vary greatly with regard to physical construction and fishing methods the following rules of thumb apply under most circumstances Hydrophones should be located as far forward as possible no...

Страница 17: ...nd hydrophones should never be subject to their direct frontal transmission Objects protruding from the hull will generate noise the areas aft of which should not be used to mount hydrophones Thruster tunnels generate air bubbles which disrupt signals from the sensors The areas aft of thruster tunnels or other sunken areas of the hull should not be used to mount hydrophones If there is any doubt a...

Страница 18: ...hould extend vertically inside the vessel over the water line so that hydrophone cables can be safely passed through the hull without the danger of flooding in the event of gland failure Hydrophones with steel through hull fittings installed in this manner can be replaced without the necessity of dry docking The cable between the hydrophone and the cabinet must be properly shielded from other pote...

Страница 19: ...nducted in both deep and shallow water the hydrophones can be tilted differently Horizontal coverage area The hydrophone s beam sensitivity is concentrated within a 50 degrees horizontal and 30 degrees vertical sector By off setting hyprophones by 20 degrees each from the vessel s centre line an overlapping coverage area of 20 degrees is provided with a total coverage area of 90 degrees Horizontal...

Страница 20: ...r when the hydrophones have the same distance from bow The hydrophones may be installed in shoes or blisters A Using shoes top view B Using blisters top view C Port hydrophone tilted 10 to 20 degrees D Starboard hydrophone tilted 20 to 35 degrees K Keel The hydrophone on the starboard side of the hull should have the greater tilt of the two approximately 20 to 35 degrees The hydrophone on the port...

Страница 21: ...rophone on the starboard side of the hull should be tilted approximately 10 to 20 degrees Note The tilt angle is measures from the vessel s water line toward the bottom when in operation A vessel s hull and keel are normally not parallel with the water line and or the bow may lift when trawling These factors must be noted and taken into consideration when deciding on the best possible hydrophone c...

Страница 22: ...Theoretic penetration depth table Tilt Distance in meters 250 500 750 1000 1250 1500 1750 2000 10 deg 50 100 150 175 225 250 300 350 15 deg 70 150 200 250 350 400 450 535 20 deg 90 180 275 350 450 550 650 750 25 deg 120 225 350 450 600 700 800 925 30 deg 150 300 450 575 700 850 1000 1150 35 deg 175 350 525 700 875 1050 1200 1400 Theoretic penetration depths for hydrophone beams The table shows the...

Страница 23: ...tion is also described to compliment the rules and regulations of the respective vessel s classification society For easy mounting and access a mounting flange is suggested This is described in drawing 871 207229 and it has part number 599 207228 Other well founded information or previous experience with the installation of similar systems may also be evaluated even if not specifically described R...

Страница 24: ...n specially constructed blisters offset from the vessel s keel preferably 1200 mm but no less than 700 mm to avoid turbulence The picture shows an example of a freestanding hydrophone offset from the keel on a wooden vessel Approximate blister location view from stern All measurements are approximate and the drawing is not in scale A Outer hull B Keel P Port hydrophone blister S Starboard hydropho...

Страница 25: ...at hydrophones 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 The section regarding hydrophone coverage including horizontal orientation and tilt also applies to hydrophones mounted in blisters ...

Страница 26: ...g must be taken into consideration Hydrophones must have an unobstructed line of sight to the sensors attached to the trawl Hydrophones should be trained 20 degrees to either side of the vessel s centre line providing a 10 degree overlap and a horizontal coverage area of 90 degrees Hydrophones should be mounted as deeply as possible on the hull but not so deep that they may be damaged when docking...

Страница 27: ...terference Hydrophone mounted at the aft end of a echo sounder transducer shoe The drawing is shown from the side and it is not to scale A Outer hull B Towards the bow C Fairing D Hydrophone E Area allocated for echo sounder transducer s The illustration shows a PI hydrophone installed aft of an echo sounder arrangement for one or more transducers and or other underwater acoustic equipment Note th...

Страница 28: ...loss in heavy weather due to bubbles or when pounding lifts the hydrophone out of the water Normally these types of interruptions are short and sensor signals can be again received once the hydrophone s is immersed Mounting the hydrophone A at the after end of a bulbous bow Hydrophones installed at the after end of bulbous bows should be tilted and oriented horizontally as explained in the corresp...

Страница 29: ...to ensure the necessary horizontal and vertical coverage for proper system operation This also allow the respective coverage areas of the hydrophones located on opposite sides of the hull to overlap each other providing the system with the ability to be optimized for a specific type and method of fishing The use of dual hydrophones have the following benefits They provide a larger area of coverage...

Страница 30: ...re with Loctitet 270 or the equivalent 6 The PI cabinet should always be connected to the ship s ground to reduce the effects of electrical interference on the system Under installation Hydrophones must not be installed until all structural work specifically welding sandblasting and other potentially harmful operations are completed If hot work sandblasting spay painting or water blasting is to be...

Страница 31: ...romised must be thoroughly cleaned and repainted For steel vessels use polyester primer undercoat and top coat according to the manufacture s instructions then apply the same anti fouling paint used on the rest of the hull 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 Racing No...

Страница 32: ...dry docking the vessel It is very important to amend the docking plans of larger vessels to also reflect this information so that blocks will not be placed in the vicinity of hydrophones fins deflection plates or other associated appendages After installation Sea trials Once the installation is complete and the vessel afloat the system s performance should be documented Refer to the appropriate se...

Страница 33: ...ands 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 Some vessels may experience difficulties finding suitable areas of the hull for mounting hydrophone cable glands due to existing water tanks concrete ballast or other obstacle...

Страница 34: ...ith respective cables spliced in a junction box and run to the wheelhouse in a conduit Cable gland for steel hull vessels A Steel conduit B Stuffing tube DNV approved carbon steel st52 3 C Washers 24 x 8 x 2 mm D Rubber gasket E Packing nipple Make sure that you do not damage the hydrophone cable by tightening the packing nipple too hard F Cable to the PI Operator unit or a junction box The gland ...

Страница 35: ...nd GRP hulls A Packing nipple Make sure that you do not damage the hydrophone cable by tightening the packing nipple too hard B Washers C Rubber gaskets D Hole diameter 28 mm E Steel conduit F Hydrophone cable The gland gland kit includes all of the necessary parts needed to install the unit excluding screws Simrad recommends that a one inch conduit that the hydrophone cable will be run through wi...

Страница 36: ...box and run to the wheelhouse in a conduit Hydrophone cable gland for small vessels A Packing nut bronze Ensure that you do not to damage the hydrophone cable by tightening the packing nut too hard B Rubber gasket C Plastic disk D Rubber gasket E Stuffing tube F Backing nut bronze G Backing washer plastic H O ring 42 5 x 3 0 N I O ring 39 5 x 3 0 N J Hydrophone cable Stuffing tube hole diameter 36...

Страница 37: ... 1 1 The red cable in the input cable MUST be connected to the red cable in the output cable etc Cable specification If extension cables are used these must be supplied by the installation shipyard The following specifications must be regarded as a minimum 2 x 2 x 0 5 mm2 Twisted pairs Overall braided Observe the information regarding cable splicing Grounding and shielding Cable shielding must be ...

Страница 38: ...ng 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 PI Trawl hydrophone mounting flange page 36 Free standing hydrophone in blister page 38 Hydrophone in keel mounted shoes page 40 ...

Страница 39: ...Installation manual 33 851 164472 Rev B PI Trawl hydrophone Outline dimensions ...

Страница 40: ...Simrad PI Catch monitoring system Trawl hydrophone 34 851 164472 Rev B PI Trawl hydrophone Cut out Page 1 ...

Страница 41: ...Installation manual 35 851 164472 Rev B PI Trawl hydrophone Cut out Page 2 ...

Страница 42: ...Simrad PI Catch monitoring system Trawl hydrophone 36 851 164472 Rev B PI Trawl hydrophone Mounting flange Page 1 ...

Страница 43: ...Installation manual 37 851 164472 Rev B PI Trawl hydrophone Mounting flange Page 2 ...

Страница 44: ...Simrad PI Catch monitoring system Trawl hydrophone 38 851 164472 Rev B PI Trawl hydrophone in blister Arrangement drawing Page 1 ...

Страница 45: ...Installation manual 39 851 164472 Rev B PI Trawl hydrophone in blister Arrangement drawing Page 2 ...

Страница 46: ...Simrad PI Catch monitoring system Trawl hydrophone 40 851 164472 Rev B PI Trawl hydrophone in keel mounted shoes Arrangement drawing Page 1 ...

Страница 47: ...Installation manual 41 851 164472 Rev B PI Trawl hydrophone in keel mounted shoes Arrangement drawing Page 2 ...

Страница 48: ...E 2005 Simrad AS ISBN 82 8066 055 0 ...

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