Hawke Transit System catalogo

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T H E H A W K E E M C T R A N S I T S Y S T E MStainless SteelStayplatesInstalled to anchor insertand filler blocks into theframe and ease assembly.They also increase theconductance throughoutthe frame.The CompressionSystemSeals the penetration whenall the services have beeninstalled. The 3 partendpacker transmits anevenly distributed pressureonto the compression plateand ensures an effective sealaround the cables.The materials:Packing blocks - intumescentflame retardant elastomercoated with a silver loadedspray and wrapped withcopper strip for effectiveshielding. End packer plates- Electro zinc plated steel orstainless steel.Compression plates-Electrozinc plated cast steel.Tolerant insert andfiller blocks.Made from an intumescentflame retardant elastomercoated on all surfaces witha silver loaded spraywhich is highly conductiveand provides the excellentshielding ability. Inaddition, a layer ofadhesive copper strip isapplied around the blockto aid conductivity. Hawkeblocks can accommodatecables ranging from 3mmto 100mmdiameter, and includetolerant blocks which allowfor variations in cablediameters by using fiveindividual sealing faceswhich take up the cablevariations within their ownindividual areas.Note:Block module size should besuffixed E (e.g. 3012/E). Theadhesive EMI Shielding Tape isavailable in the followinglengths:Size 18 = 16.5mSize 36 = 32.9mAdhesive Copper StripProvided to build up to theinsertblocks and the strippedcable. The cable outersheath should be strippedto a maximum width of2cm to expose the cablescreen. All the cablesrequire the removal of theouter sheath toachieve contact betweenthe cable screen and theblocks. The copper EMIshielding tape withconductive adhesive iswrapped around thecable screen until thenominal outside diameterof the cable is achieved.This is important to ensurecomplete conductance ofthe electromagneticpulses/fields in the innerwalls of the steel frameagainst earth.The FrameThe electro zinc plated steelor stainless steel frame isattached to the structure andforms thesurround for the penetration.32PERFECTION INVITES CLOSER INSPECTION
F O R C A B L E S A N D P I P E STesting ProceduresHunting Communication Technology Limited, Electromagnetic Assessment Group, werereferred to as specialists with extensive testing facilities. A series of three specified tests wererecommended to assess the transit performance and provide design data.HawkeEMC Transit Systemfor Cables and PipesFig 1.– Test for Shielding Effectiveness(No. U2501/TR/6660)The aim of the test was to measure theshielding effectiveness of the Transit by amethod generally in accordance with MILSTD 285. The testing was actually performedusing a swept measurement techniqueemploying a spectrum analyser with trackinggenerator to 1GHz and a Scalar networkanalyser from 1GHz to 10GHz.Conclusion:The Transit showed good shielding results being inexcess of 70dB over much of the tested frequencyrange.Fig 2.–Test for Current Leakage(No. U2501/TR/6661)The test was designed to assess theconductivity of the Transit when used with avariety of cables. As there is not a standardspecification for this assessment, a test methodwas formulated which measured theconductivity in terms of current leakage fromthe cable shield to earth within a frequencyrange of 100KHz to 500MHz.Conclusion:Based upon the worst case data obtained, itwas observed that the current leakage wasbetter than 35dB over the frequency range100KHz to 500MHz. Infact, for most of thefrequency range the current leakage was atleast 50db.Fig 3.– Test for transient (pulse) conductivity(No. 2501/TR/6662)The tests involved assessing the transientconductivity of the Transit when used with avariety of cables. The method used measuredthe conductivity in terms of current leakagefrom the cable shield to earth under thetransient conditions. The test was based uponDEF STAN 59-41 using transients consisting ofa 100KHz damped sinusoid applied by acurrent transformer.Conclusion:The current leakage under transient conditionsfor the cable set ups tested show a minimuminsertion loss of 30dB.Fig 1.– Test for Shielding Effectiveness(No. U2501/TR/6660)Fig 2.–Test for Current Leakage(No. U2501/TR/6661)Fig 3.– Test for transient (pulse)conductivity(No. 2501/TR/6662)Fig 3.– Test for transient (pulse)conductivity(No. 2501/TR/6662)The Hazards of RFI/EMPThe need to protect sensitive electronicequipment against extraneouselectromagnetic and radio frequencyradiation is an increasing and criticalfactor in the design of equipment andinstallations.A major concern is to ensure the integrityof operation of the equipment such ascomputers, signalling control andcommunication systems by effectivesealing and low resistance earthcontinuity bonding at cable and pipeentry points of a low ‘noise’ environment.Electromagnetic Compatibility (EMC).This is the term used to express theability of electronic equipment or systemsto operate satisfactorily in a givenenvironment without responding toelectrical noise or emitting unwantednoise.The Hawke EMC Cable Transit System.Hawke’s system has been furtherdeveloped from the highly successfulCivil and Marine Transits which areequally suitable for cables or pipes.Electromagnetic compatibility isachieved by reducing theElectromagnetic interference (EMI) to alevel which in most applications willnot disrupt the proper operation of theelectronics.www.hawke-hts.com33
Page 2 and 3: H A W K E R O U N D , M A R I N E A
Page 4 and 5: WHAT IS A CABLE TRANSIT SYSTEM?A Tr
Page 6 and 7: TOLERANT BLOCK SIZE RANGEThis enabl
Page 8 and 9: SELECTION AND SPECIFICATION PROCEDU
Page 10 and 11: COMPRESSION SYSTEM COMPONENTSCompre
Page 12 and 13: H A W K E C I V I L T R A N S I T S
Page 14 and 15: C I V I L T R A N S I T S Y S T E M
Page 16 and 17: C I V I L F R A M E - D I M E N S I
Page 18 and 19: C I V I L T R A N S I T S Y S T E M
Page 20 and 21: H A W K E M A R I N E T R A N S I T
Page 22 and 23: MARINE FRAME INSTALLATION INSTRUCTI
Page 24 and 25: M U L T I P L E F R A M E A P PFRAM
Page 26 and 27: MARINE FRAME - DIMENSIONAL DATA26ww
Page 28 and 29: 28H A W K E R O U N D T R A N S I T
Page 30 and 31: T R A N S I T I N S T A L L A T I O
Page 34 and 35: EMC TRANSIT SYSTEM INSTALL ATION GU
Page 36: HAWKE TRANSIT SYSTEM - HTSHead Offi

Hawke Transit System catalogo

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