To cope with VACUUM which is occurred in the sloshing condition of ballast byrolling and pitch-

ing of the vessel, it is desinged to combine the advantages of boththe half ball float and BOX

TYPE AIR VENT HEAD.

AIR VENT HEADAIR VENT HEAD

G.S Hightecher Co., Ltd.

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Certi ed Type Approvals by international classi cation societies

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Box type Air Vent Head consists of a body and a chamber. Because CASTING type and PIPE formtype Air Vent Head

need much space in installation with heavy weight, the box type Air Vent Head isrelatively developed with lowering in

weight and size accordingly enhanced the work e ciency.When sea water comes into the tank through chamber of

Air Vent Head, The oat preventsseawater from coming into the tank by sealing the seat of chamber. We have developed

SNAP LIPSEAL for sealing tightly. Two openings are designed above 100A to be owed o well and the designmeets

class regulation with IACS. FLAME SCREEN is provided to prevent the ame from entering intothe tank. The kinds of

FLANGE or length of PIPE is adjustable according to customer request.

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Air Vent Head which is installed on the vessel is required strict design and function according toclassi cation regulation

and IACS P3 in order not to be in owed in tank by seawater.As the exisiting method is that the face of gasket and oat

is touched directly, The leakage occursbetween gasket and oat. For the vessel safety, the junction method of gasket

and oat has beenconsequently improved. Therefore an exible snap lip is seated in the lower part of gasket,

sealedtightly and prevented from ooding of the vessel.

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The half ball oat is made of disc shape in the lower part, the upper part is shape of circle, and itis increased of FLOW AREA, it is

reinforced the volume of the upper part, and it is satis ed withFLOW RATE to enlarge cross section area rate of regular capacity.

It is solved the VACCUM problem to increase the FLOW VOLUME due to having suction crosssectional area enlarge and VACUUM

sectional area rate to become small.

In the condition of satisfying the FLOW RATE, the safety was jumped up due to adjusting utmostheight of R in chamber and in-

creasing FLOW AREA volume.

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Having the damage of oat to be prevented to reduce the resistance of ow material due tothe design as circle in the upper

of half ball oat.

When the vessel is rolled left and right, it is enlarged the suction cross sectional area rate inthe contrast of vaccum by sloshing

of water careen, and it is prepared the safety due to putdown the buoyancy.

Disc oat is occurred pin hole by the corrosion which is contaminated other material, chipdue to the plane in the upper part,

but half ball oat is rolled down other material due to thecircle in the upper part.

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FLOW AREA RATE VACUUM AREA RATE

AREA RATE

1. Structure and principle of half ball oat

2. The merit of half ball oat

FRICTIONREDUCTION

FLOTAGEREDUCTION

FRICTIONREDUCTION

FRICTIONREDUCTION

105

120

135

232

276

318

425

520

588

678

758

840

917

1001

1091

1229

170

212

235

255

304

346

444

551

644

738

835

916

163

186

221

254

286

330

409

514

598

674

767

848

904

1026

1121

1248

134

146

162

237

291

345

441

552

646

733

737

820

8.8

10.6

12.6

18.1

23.6

31.3

49.1

71.4

86.2

118.2

151.4

182.1

216.2

265.8

318.6

371.7

9.8

11.6

13.6

18.0

27.0

38.0

71.0

102

143

191

273

306

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We developed the Air Vent Head-Box type with a steel plate which is satis ed FLOW RATE and the rule ofworld classi -cation societies comparable to existing air vent head of CASTING TYPE, PIPE FORM TYPE.Thus, we designed its compactweight of the air vent head must be light for her dead weight as an out ttingsof ship with minimization of body size toenlarge the available space which is required for reducing a deadspace of passage way.

As our quali ed products which acquired type approvals (ABS,DNV,RINA,KR,NK,BV,GL,LR), the existingproducts whichis heavy weight, irregular thickness, corrosion and brittleness are not economical. Thus, wedesigned the Air Vent Head-Box type with a steel plate in the rule of IACS P3, S27 and regular thickness whichresulted in the notable weight reduction,strong structure and easy application.

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165.2

(Bonnet Type)

216.3

216.3

267.4

318.5

355.6

457.2

558.8

660.4

711.2

850

920

997

1074.6

1151.1

1228.7

152

158

179

256

285

338

412

513

601

677

770

875

937

1074.6

1151.1

1228.7

AIR VACUUM(REVERSE FLOW)

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●FLOATFLOAT COMPARISON

●COMPARISON OF FLOW VELOCITY, VOLUME AS PER FLOATFLOAT

THE COMPARISON OF FLOAT

SECTION DISC HALF BALL BALL

FUNCTION

• Air proof is large and other material-sticked

• Afraid of damage by the shock over-owed

• Unstable by vaccum when thecareencondition of ballast water inrolling andpitching of vessel.

• Design as shape of ball in theupper partto ow down of othermaterial and to re-duce air proof andexclusion of shock.

• Exclusive design of vaccum topreparecareen condition of ballastwater whenrolling and pitching ofvessel.

• Safe oat against vaccum condition-when rolling and pitching of vessel.

• Prevent the condition which isstickedother material in the upperpart and min-imum of air proof.

SAFETY

• Using the guide and not to hit thecham-ber when the vessel rolling

• Gasket & oat damaged due tovaccumcondition repeatly.

• As the junction surface of gasketandoat is at, the oat is movableand the

leakage occurs regardless ofbuoyance

• Using the guide and not to hit thecham-ber when the vessel rolling.

• No damage with exclusion ofvaccumcondition.

• Afraid the damage by hit thechamber asrolling of vessel.

• Exclusion of vaccumECONOMY

ECONOMY • Good• Good(two times of DISC FLOAT and par-allel with ball oat)

• Being inferior

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Box Type Disc Float : 40A~80A

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Box Type Disc Float : 100A~650A

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Box Type Halfball Float : 40A~80A

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Box Type Halfball Float : 100A~650A

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Box Type Ball Float : 40A~80A

193 130 8.9

193

219

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Box Type Ball Float : 100A~600A

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Box Type Over Flow Half Ball Float : 100A~500A

※NOTE 1.Lifting lug to be for 150A and above size.

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Box Type Over Flow Ball Float : 100A~500A

※NOTE 1.Lifting lug to be for 150A and above size.

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Air Vent Head Double Check Valve Type

Having flow over in lower part, after installation double venthead to prevent flowingthe fluid from Air Vent Head.

※NOTE 1.Standard coating : Hot dip Gal'v (only carbon steel part) 2.Flame screen with wire mesh #30 to be fitted for oil & F.W.tank and W.B.T of oil & chemical carrier or wire mesh #4 for other tanks.

※NOTE 1.Lifting lug to be for 150A and above size.

GOOE NECK AIR VENT HEAD

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GOOSENECK WALL MOUNT TYPE

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GOOSENECK AIR VENT HEAD DECK TYPE

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G.S Hightecher Co., Ltd.91, Mijeononggongdanji-gil, Samrangjin-eupMiryang-si, Gyeongsangnam-do, KOREATEL : + 82-51-832-0456 FAX : + 82-51-316-3339e-Mail: gsht0235@naver.com Web: http://gshightecher.koreasme.com