1、 RULES FOR BUILDING AND CLASSING STEEL VESSELS UNDER 90 METERS (295 FEET) IN LENGTH 2017 NOTICE NO. 1 JULY 2017 The following Rule Changes were approved by the ABS Rules Committee on 30 May 2017 and become EFFECTIVE AS OF 1 JULY 2017. (See http:/www.eagle.org for the consolidated version of the Rule
2、s for Building and Classing Steel Vessels Under 90 meters (295 feet) in Length, 2017, with all Notices and Corrigenda incorporated.) Notes - The date in the parentheses means the date that the Rule becomes effective for new construction based on the contract date for construction, unless otherwise n
3、oted. (See 1-1-4/3.3 of the ABS Rules for Conditions of Classification (Part 1).) PART 3 HULL CONSTRUCTION AND EQUIPMENT CHAPTER 2 HULL STRUCTURES AND ARRANGEMENTS SECTION 11 RUDDERS AND STEERING EQUIPMENT 17 Double Plate Rudder (Revise Paragraph 3-2-11/17.1 and add new 3-2-11/Figures 5, 6, and 7, a
4、s follows:) 17.1 Strength (1 July 2017) The section modulus and web area of the rudder mainpiece are to be such that the stresses indicated in the following Subparagraphs are not exceeded. In calculating the section modulus of the rudder, the effective width of side plating is to be taken as not gre
5、ater than twice the athwartship dimension of the rudder. Bolted cover plates on access openings to pintles are not to be considered effective in determining the section modulus of the rudder. In order for a cover plate to be considered effective, it is to be closed using a full penetration weld and
6、confirmed suitable by non-destructive testing method. Generous radii are to be provided at abrupt changes in section where there are stress concentrations, including in way of openings and cover plates. When inspection windows are located in the panel below the rudder hub, the stress is to be as per
7、mitted in way of cutouts. Moments, shear forces and reaction forces are to be as given in 3-2-11/7.5 and 3-2-11/13.5. For spade rudders and rudders with horns, the section modulus at the bottom of the rudder is not to be less than one-third the required section modulus of the rudder at the top of th
8、e rudder or at the center of the lowest pintle. Special attention is to be paid in design and construction of rudders with slender foil sections in the vicinity of their trailing edge (e.g., hollow foil sections, fishtail foil sections). Where the width of the rudder blade at the aftermost vertical
9、diaphragm, w, is equal or less than 1/6of the trailing edge length measured between the diaphragm and the trailing edge, , finite element vibration analysis of the rudder blade is also to be submitted for review. See 3-2-11/Figure 5. ABSRULES FOR BUILDING AND CLASSING STEEL VESSELS UNDER 90 METERS (
10、295 FEET) IN LENGTH .2017 1 Notice No. 1 July 2017 FIGURE 5 (1 July 2017) wSpade rudders with an embedded rudder trunk are to have a trailing edge with dimensions that satisfy the following requirements: i) For a rudder trailing edge having a monotonous transition to a rounded end with a finite thic
11、kness or diameter (see 3-2-11/Figure 6), the vortex shedding frequency calculated using the equation given below is to be higher than 35 Hz. fs= TDUSTDt +where fs= vortex shedding frequency, in Hz U = flow velocity, in m/s (ft/s), which is taken as vessels design speed with vessel running ahead at t
12、he maximum continuous rated shaft rpm and at the summer load waterline St= nominal Strouhal number = 0.18 D= 0.27 C = minimal chord length of rudder cross section profile, in m (ft) D = nominal boundary layer thickness at trailing edge = 0.01C T= 0.77 T = thickness or diameter of rounded end, in m (
13、ft) FIGURE 6 (1 July 2017) Thickness or Diameter of Rounded End2 ABSRULES FOR BUILDING AND CLASSING STEEL VESSELS UNDER 90 METERS (295 FEET) IN LENGTH .2017 Notice No. 1 July 2017 ii) For a rudder trailing edge with a flat insert plate (see 3-2-11/Figure 7), the insert plate thickness, t0, is to be
14、no larger than 1.5Vdin mm, where Vdis the design speed in ahead condition, in knots, as defined in 3-2-11/3.1. The extension beyond the weld to rudder plate, , is to satisfy the following 3-2-11/Figure 7 and with consideration of possible local vibratory bending of the insert plate. FIGURE 7 (1 July
15、 2017) Insert Plate Thicknesst0Rudder Plate Thicknesst1 (t0+ 2t1)Alternatively, a vibration analysis is to be carried out to confirm that the natural frequency of the rudder is to be at least 20% away from the vortex shedding frequency preferably determined using either a detailed numerical analysis
16、 method such as CFD or testing for ballast and full draft at 85% and 100% Vdas defined in 3-2-11/3.1. (Renumber existing 3-2-11/Figures 5 through 8 as 3-2-11/Figures 8 through 11.) (Revise Subparagraph 3-2-11/17.1.2, as follows:) 17.1.2 In Way of Cutouts Allowable stresses for determining the rudder
17、 strength in way of cutouts (see 3-2-11/Figure 8) are as follows: Bending stress b= K/Q N/mm2(kgf /mm2, psi) Shear stress = K/Q N/mm2(kgf /mm2, psi) Equivalent stress e= 223 +b= Ke/Q N/mm2(kgf/mm2, psi) where SI units MKS units US units K75 7.65 10,900 K50 5.1 7,300 Ke100 10.2 14,500 Q = 1.0 for ord
18、inary strength hull steel = as defined in 3-2-1/7.5 for higher strength steel plate ABSRULES FOR BUILDING AND CLASSING STEEL VESSELS UNDER 90 METERS (295 FEET) IN LENGTH .2017 3 Notice No. 1 July 2017 FIGURE 8 (2009) Z6r26r16r1r26r2XNote:r1= corner radius of rudder plate in way ofportable bolted ins
19、pection holer2= corner radius of rudder plateIn way ofcutoutsr1The mainpiece of the rudder is to be formed by the rudder side plating (but not more than the effective width indicated above) and vertical diaphragms extending the length of the rudder or the extension of the rudder stock or a combinati
20、on of both. PART 4 VESSEL SYSTEMS AND MACHINERY CHAPTER 3 PROPULSION AND MANEUVERING MACHINERY SECTION 3 STEERING GEAR 11 Steering Gear Control System 11.3 General (1 July 2011) (Add new Subparagraph 4-3-3/11.3.5, as follows:) 11.3.5 System Response Under Failure (1 July 2017) The failures (as liste
21、d, but not limited to items in 4-3-3/11.9) likely to cause uncontrolled movements of rudder are to be clearly identified. In the event of detection of such failure, the rudder should stop in the current position. Alternatively, the rudder may be set to return to the midship/neutral position. Failure
22、 Mode and Effect Analysis methodology may be used to identify the failures. 11.9 Instrumentation and Alarms (Revise Subparagraph 4-3-3/11.9.7, as follows:) 11.9.7 Low Oil Level Alarm (1 July 2017) A visual and audible alarm is to be given on the navigation bridge and engine room control station to i
23、ndicate a low oil level in any power unit reservoir. The operation of this alarm is not to interrupt the power supply circuit. 4 ABSRULES FOR BUILDING AND CLASSING STEEL VESSELS UNDER 90 METERS (295 FEET) IN LENGTH .2017 Notice No. 1 July 2017 (Add new Subparagraph 4-3-3/11.9.12, as follows:) 11.9.1
24、2 Earth Fault (1 July 2017) A visual and audible alarm is to be given on the navigation bridge to indicate an earth fault on AC and DC circuits (Add new Subparagraph 4-3-3/11.9.13, as follows:) 11.9.13 Deviation (1 July 2017) Where arrangements discussed in 4-3-3/11.9.8, 4-3-3/11.9.9, 4-3-3/11.9.10
25、and 4-3-3/11.9.11 can lead to reduced or erroneous system performance of the commanded change in rudder angle, a deviation alarm visible and audible at the navigating bridge shall be initiated if the rudders actual position does not reach the set point within acceptable time limits for the closed lo
26、op control systems (e.g., follow-up control, computer based systems, and autopilot). Deviation alarm may be caused by mechanical, hydraulic or electrical failures. See 4-3-3/11.9.8, 4-3-3/11.9.9, 4-3-3/11.9.10 and 4-3-3/11.9.11 for acceptable time limits or angle deviations, as applicable. PART 4 VE
27、SSEL SYSTEMS AND MACHINERY CHAPTER 4 PUMPS AND PIPING SYSTEMS SECTION 1 GENERAL 9 General Installation Details 9.19 Flexible Hoses (2006) 9.19.3 Design and Construction (Revise Item 4-4-1/9.19.3(c), as follows:) 9.19.3(c) Fire Resistance (1 July 2017). Flexible hose assemblies constructed of non-met
28、allic materials intended for installation in piping systems for flammable media and sea water systems where failure may result in flooding are to be of a fire-resistant type*, except in cases where such hoses are installed on open decks having no fire risk, and not used for fuel oil lines. Fire resi
29、stance is to be demonstrated by testing to ISO 15540 and ISO 15541. * Note: The installation of a shutoff valve immediately upstream of a sea water hose does not satisfy the requirement for fire resistant type hose. ABSRULES FOR BUILDING AND CLASSING STEEL VESSELS UNDER 90 METERS (295 FEET) IN LENGT
30、H .2017 5 Notice No. 1 July 2017 PART 4 VESSEL SYSTEMS AND MACHINERY CHAPTER 6 ELECTRICAL INSTALLATIONS SECTION 2 SHIPBOARD SYSTEMS 7 Distribution System (Revise Paragraph 4-6-2/7.9, as follows:) 7.9 Harmonics (1 July 2017) The total harmonic distortion (THD) in the voltage waveform in the distribut
31、ion systems is not to exceed 8% and any single order harmonics not to exceed 5%. Other higher values may be accepted provided the distribution equipment and consumers are designed to operate at the higher limits. This relaxation on THD limits is to be documented (harmonic distortion calculation repo
32、rt) and made available on board as a reference for the Surveyor at each periodical survey. Where higher values of harmonic distortion are expected, any other possible effects, such as additional heat losses in machines, network resonances, errors in control and monitoring systems are to be considere
33、d. See also 4-6-2/9.18 and 4-6-2/9.19. 9 Circuit Protection System (Add new Paragraph 4-6-2/9.18, as follows:) 9.18 Harmonic Distortion for Ship Electrical Distribution System including Harmonic Filters (1 July 2017) 9.18.1 Monitoring Where the electrical distribution system on board a ship includes
34、 harmonic filters, such ships are to be fitted with facilities to continuously monitor the levels of harmonic distortion experienced on the main bus bar as well as alert the crew should the level of harmonic distortion exceed the acceptable limits. Where the engine room is provided with automation s
35、ystems, this reading is to be logged electronically, otherwise it is to be recorded in the engine log book for future inspection by the Surveyor. However, harmonic filters installed for single application frequency drives such as pump motors may be excluded from the requirements of this section. 9.1
36、8.2 Measurement As a minimum, harmonic distortion levels of main bus bar on board such existing ships are to be measured annually under seagoing conditions as close to the periodical machinery survey as possible so as to give a clear representation of the condition of the entire plant to the Surveyo
37、r. Harmonic distortion readings are to be carried out when the greatest amount of distortion is indicated by the measuring equipment. An entry showing which equipment was running and/or filters in service is to be recorded in the log so this can be replicated for the next periodical survey. Harmonic
38、 distortion levels are also to be measured following any modification to the ships electrical distribution system or associated consumers by suitably trained ships personnel or from a qualified outside source. Records of all the above measurements are to be made available to the surveyor at each per
39、iodical survey in accordance with the ABS Rules for Survey After Construction (Part 7). 9.18.3 Validation of Calculated Harmonic Where the electrical distribution system on board a ship includes harmonic filters, the system integrator of the distribution system is to show, by calculation, the effect
40、 of a failure of a harmonic filter on the level of harmonic distortion experienced. The system integrator of the distribution system is to provide the ship owner with guidance documenting permitted modes of operation of the electrical distribution system while maintaining harmonic distortion levels
41、within acceptable limits during normal operation as well as following the failure of any combination of harmonic filters. 6 ABSRULES FOR BUILDING AND CLASSING STEEL VESSELS UNDER 90 METERS (295 FEET) IN LENGTH .2017 Notice No. 1 July 2017 The calculation results and validity of the guidance provided
42、 are to be verified by the Surveyor during sea trials. 9.18.4 Filter Protection Alarm Arrangements are to be provided to alert the crew in the event of activation of the protection of a harmonic filter circuit. A harmonic filter is to be arranged as a three-phase unit with individual protection of e
43、ach phase. The activation of the protection arrangement in a single phase is to result in automatic disconnection of the complete filter. Additionally, there is to be installed a current unbalance detection system independent of the overcurrent protection alerting the crew in case of current unbalan
44、ce. Consideration is to be given to additional protection for the individual capacitor element as (e.g., relief valve or overpressure disconnector) in order to protect against damage from rupturing. This consideration is to take into account the type of capacitors used. (Revise first paragraph of Pa
45、ragraph 4-6-2/9.19, as follows:) 9.19 Protection of Harmonic Filter Circuits (1 July 2017) Notwithstanding the requirements of 4-6-2/9.18 above, harmonic filters circuits shall be protected against overload and short-circuit. An alarm is to be initiated in a continuously manned location in the event
46、 of an activation of overload or short-circuit protection. (Following text remains unchanged.) PART 4 VESSEL SYSTEMS AND MACHINERY CHAPTER 6 ELECTRICAL INSTALLATIONS SECTION 4 MACHINERY AND EQUIPMENT 13 Cables and Wires 13.1 Cable Construction (Revise first paragraph of Subparagraph 4-6-4/13.1.1, as
47、 follows:) 13.1.1 General (1 July 2017) Electric cables are to have conductors, insulation and moisture-resistant jackets, in accordance with IEC Publication 60092-350, 60092-352, 60092-353, 60092-354, 60092-360, 60092-370, 60092-376, or IEEE Std. 45. Other recognized marine standards of an equivale
48、nt or higher safety level, will also be considered. The tests may be carried out by the manufacturer whose certificate of tests will be acceptable and is to be submitted upon request from ABS. Network cables are to comply with a recognized industry standard. Cables such as flexible cable, fiber-opti
49、c cable, etc., used for special purposes may be accepted provided they are manufactured and tested in accordance with recognized standards accepted by ABS. Conductors are to be of copper and stranded in all sizes. Conductors are not to be less than the following in cross sectional size: (Following text remains unchanged.) ABSRULES FOR BUILDING AND CLASSING STEEL VESSELS UNDER 90 METERS (295 FEET) IN LENGTH .2017 7 Notice No. 1 July 2017 PART 4 VESSEL SYSTEMS AND MACHINERY CHAPTER 7 SHIPBOARD AUTOMATIC OR REMOTE CONTROL AND MONITORING SYSTEMS SECTION
