1、 RULES FOR BUILDING AND CLASSING OFFSHORE SUPPORT VESSELS 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 Rules for Building and Classin
2、g Offshore Support Vessels 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 noted. (See 1-1-4/3.3.) PART 3 HULL CONSTRUCTION AND E
3、QUIPMENT CHAPTER 2 HULL STRUCTURES AND ARRANGEMENTS SECTION 14 RUDDERS AND STEERING EQUIPMENT 17 Double Plate Rudder (Revise Paragraph 3-2-14/17.1 and add new 3-2-14/Figures 5, 6, and 7, as follows:) 17.1 Strength (1 July 2017) Rudder section modulus and web area are to be such that stresses indicat
4、ed 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 greater than twice the extreme athwartship dimension of the rudder in way of horizontal section being considered. Bolted cover plates on acc
5、ess or inspection openings to pintles or nuts 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 confirmed suitable by non-destructive testing method. Smooth
6、curvature or radii are to be provided at abrupt changes in section where stress concentrations occur, 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 permitted in way of cutouts. Moments, shear forces and re
7、action forces are to be obtained by direct calculation, which is to be submitted. Guidance for calculation of these values is given in Appendix 3-2-A4. 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 modu
8、lus of the rudder at the top of the 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 rudde
9、r blade at the aftermost vertical 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 3-2-14/Figure 5. ABSRULES FOR BUILDING AND CLASSI
10、NG OFFSHORE SUPPORT VESSELS .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 fin
11、ite thickness or diameter (see 3-2-14/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 ah
12、ead at the 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
13、, in m (ft) FIGURE 6 (1 July 2017) Thickness or Diameter of Rounded End2 ABSRULES FOR BUILDING AND CLASSING OFFSHORE SUPPORT VESSELS .2017 Notice No. 1 July 2017 ii) For a rudder trailing edge with a flat insert plate (see 3-2-14/Figure 7), the insert plate thickness, t0, is to be no larger than 1.5
14、Vdin mm, where Vdis the design speed in ahead condition, in knots, as defined in 3-2-14/3.1. The extension beyond the weld to rudder plate, , is to satisfy the following 3-2-14/Figure 7 and with consideration of possible local vibratory bending of the insert plate. FIGURE 7 (1 July 2017) Insert Plat
15、e 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 method such as CF
16、D or testing for ballast and full draft at 85% and 100% Vdas defined in 3-2-14/3.1. (Renumber existing 3-2-14/Figures 5 through 11 as 3-2-14/Figures 8 through 14.) (Revise Subparagraph 3-2-14/17.1.2, as follows:) 17.1.2 In way of Cutouts Allowable stresses for determining the rudder strength in way
17、of cutouts (see 3-2-14/Figure 8) are as follows: Bending stress b= K/Q N/mm2(kgf/mm2, lbs/in2) Shear stress = K/Q N/mm2(kgf/mm2, lbs/in2) Equivalent stress e= 223 +b= Ke/Q N/mm2(kgf/mm2, lbs/in2) 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 ordinary s
18、trength hull steel = as defined in 3-2-1/5.5 for higher strength steel plate ABSRULES FOR BUILDING AND CLASSING OFFSHORE SUPPORT VESSELS .2016 3 Notice No. 1 July 2017 FIGURE 8 Z6r26r16r1r26r2XNote:r1= corner radius of rudder plate in way ofportable bolted inspection holer2= corner radius of rudder
19、plateIn way ofcutoutsr1PART 4 VESSEL SYSTEMS AND MACHINERY CHAPTER 2 PRIME MOVERS SECTION 1 DIESEL ENGINES 13 Testing, Inspection and Certification of Diesel Engines 13.9 Shop Tests of Internal Combustion, I.C. Engines (1 July 2016) 13.9.2 Engines Driving Propellers or Impellers Only (Revise Item 4-
20、2-1/13.9.2iv), as follows:) iv) (1 July 2017) 90% (or normal continuous cruise power), 75%, 50% and 25% of rated power, in accordance with the nominal propeller curve (the sequence to be selected by the engine manufacturer). 4 ABSRULES FOR BUILDING AND CLASSING OFFSHORE SUPPORT VESSELS .2017 Notice
21、No. 1 July 2017 (Revise 4-2-1/Table 1, as follows:) TABLE 1 Required Material and Nondestructive Tests of Diesel Engine Parts(1)(1 July 2017) Engine Part Material Properties (2)Nondestructive Tests for which purpose, plans and data as required by 4-2-2/1.5 are to be submitted to ABS for approval, sh
22、owing compliance with the requirements of this Section. A unit of the same type is to be satisfactorily containment and type tested, as required by 4-2-2/5.3 and 4-2-2/5.7. ABSRULES FOR BUILDING AND CLASSING OFFSHORE SUPPORT VESSELS .2016 9 Notice No. 1 July 2017 ii) Turbochargers of category C are
23、to be surveyed during its construction for compliance with the design approved, along with, but not limited to, material tests, hydrostatic tests, dynamic balancing, performance tests, etc., as indicated in 4-2-2/11.1, all to be carried out to the satisfaction of the Surveyor. iii) Each turbocharger
24、 required to be certified by 4-2-2/1.1 is to be delivered with certificates indicating compliance with the requirements of this section and the applicable type approval. 11.3.2 Approval Under the Type Approval Program 11.3.2(a) Product Design Assessment. Upon application by the manufacturer, each mo
25、del of a type of turbocharger is to be design assessed as described in 1-1-A3/5.1 of the ABS Rules for Conditions of Classification (Part 1). For this purpose, each design of a turbocharger type is to be approved in accordance with 4-2-2/11.3.1i). Turbochargers so approved may be applied to ABS for
26、listing on the ABS website as Products Design Assessed. Once listed, and subject to renewal and updating of the certificate as required by 1-1-A3/5.7 of the ABS Rules for Conditions of Classification (Part 1), turbocharger particulars will not be required to be submitted to ABS each time the turboch
27、arger is proposed for use onboard a vessel. 11.3.2(b) Manufacturing Assessment for Turbochargers. A manufacturer of turbochargers, who operates a quality assurance system in the manufacturing facilities, may apply to ABS for quality assurance assessment described in 1-1-A3/5.3.1(a) (Manufacturers Pr
28、ocedure), 1-1-A3/5.3.1(b) (RQS) or 1-1-A3/5.5 (PQA (IACS UR Z26 Alternative Certification Scheme) of the ABS Rules for Conditions of Classification (Part 1). Upon satisfactory assessment under 1-1-A3/5.5 (PQA) of the ABS Rules for Conditions of Classification (Part 1), turbochargers produced in thos
29、e facilities will not require a Surveyors attendance at the tests and inspections indicated in 4-2-2/11.3.1ii). Such tests and inspections are to be carried out by the manufacturer whose quality control documents will be accepted. Certification of each turbocharger will be based on verification of a
30、pproval of the design and on continued effectiveness of the quality assurance system. See 1-1-A3/5.7.1(a) of the ABS Rules for Conditions of Classification (Part 1). Audits under PQA are to include: Chemical composition of material for the rotating parts Mechanical properties of the material of a re
31、presentative specimen for the rotating parts and the casing UT and crack detection of rotating parts Dimensional inspection of rotating parts Rotor balancing Hydrostatic pressure testing Overspeed testing. 11.3.2(c) Type Approval Program. Turbocharger types which have their designs approved in accor
32、dance with 4-2-2/11.3.2(a) and the quality assurance system of their manufacturing facilities approved in accordance with 4-2-2/11.3.2(b) will be deemed Type Approved and will be eligible for listing on the ABS website as Type Approved Product. 10 ABSRULES FOR BUILDING AND CLASSING OFFSHORE SUPPORT
33、VESSELS .2017 Notice No. 1 July 2017 PART 4 VESSEL SYSTEMS AND MACHINERY CHAPTER 3 PROPULSION AND MANEUVERING MACHINERY SECTION 4 STEERING GEARS 13 Control Systems 13.1 General (1 July 2011) (Add new Subparagraph 4-3-4/13.1.9, as follows:) 13.1.9 System Response Under Failure (1 July 2017) The failu
34、res (as listed, but not limited to those items in 4-3-4/Table 1) 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/neu
35、tral position. Failure Mode and Effect Analysis methodology may be used to identify the failures. (Revise 4-3-4/Table 1, as follows:) TABLE 1 Steering Gear Instrumentation (1 July 2017) Monitored Parameters Display/Alarm Location a) Rudder angle indicator (1)Display Navigation bridge Steering gear c
36、ompartment b) Power unit motor running Display Navigation bridge Engine room control station c) Power unit power supply failure Alarm Navigation bridge Engine room control station d) Power unit motor overload (2)Alarm Navigation bridge Engine room control station e) Power unit motor phase failure (2
37、), (3)Alarm Navigation bridge Engine room control station f) Control power failure Alarm Navigation bridge Engine room control station g) (1 July 2017) Hydraulic oil reservoir low level (2)Alarm Navigation bridge Engine room control station h) Hydraulic lock (4)Alarm Navigation bridge i) Auto-pilot
38、running (5)Display Navigation bridge j) Auto-pilot failure (5)Alarm Navigation bridge k) Steering mode (autopilot/manual) indication Display Navigation bridge l) Automatic autopilot (5)override failure Alarm Navigation bridge m) Automatic autopilot (5)override activated Alarm Navigation bridge n) (1
39、 July 2011) Loop failures (6)Alarm Navigation bridge o) (1 July 2011) Computer-based system failures (7)Alarm Navigation bridge p) (1 July 2017) Earth fault on AC and DC circuits Alarm Navigation bridge q) (1 July 2017) Deviation between rudder order and feedback Alarm Navigation bridge (Notes remai
40、n unchanged.) ABSRULES FOR BUILDING AND CLASSING OFFSHORE SUPPORT VESSELS .2016 11 Notice No. 1 July 2017 PART 4 VESSEL SYSTEMS AND MACHINERY CHAPTER 3 PROPULSION AND MANEUVERING MACHINERY SECTION 5 THRUSTERS 1 General (Revise Paragraph 4-3-5/1.1, as follows:) 1.1 Application (1 July 2017) The provi
41、sions of this Section apply to maneuvering thrusters not intended to assist in propulsion, and to azimuthal and non-azimuthal thrusters (and to alternative propulsion and steering systems without a rudder, as applicable) intended for propulsion, maneuvering or dynamic positioning, or a combination o
42、f these duties. Maneuvering thrusters intended to assist maneuvering and dynamic positioning thrusters, where fitted, may, at the request of the owners, be certified in accordance with the provisions of this Section. In such cases, appropriate class notations, as indicated in 4-3-5/1.3, will be assi
43、gned upon verification of compliance with corresponding provisions of this Section. Thrusters intended for propulsion with or without combined duties for assisting in maneuvering or dynamic positioning are to comply with appropriate provisions of this Section in association with other relevant provi
44、sions of Part 4, Chapter 3. Thruster types not provided for in this Section, such as cycloidal propellers, pump or water-jet type thrusters, will be considered, based on the manufacturers submittal on design and engineering analyses. Thrusters are to be constructed with sufficient strength, capacity
45、 and the necessary supporting systems to provide reliable propulsion and steering to the vessel in all operating conditions. Special consideration will be given to the suitability of any essential component which is not duplicated. For a vessel fitted with multiple steering systems, each steering sy
46、stem is to be so arranged that the failure of one of them will not render the other one inoperative. Each of the steering systems is equipped with its own dedicated steering gear, provided that each of the steering systems is fulfilling the requirements for main steering gear (as given in 4-3-5/5.12
47、.1) and each of the steering systems is provided with an additional function for positioning and locking the failed steering system in a neutral position after a failure of its own power unit(s) and actuator(s). 1.5 Definitions (Add new Subparagraph 4-3-5/1.5.6, as follows:) 1.5.6 Steering System (1
48、 July 2017) “Steering system” is a vessels directional control system, including main steering gear, auxiliary steering gear, steering gear control system and rudder, if any. 12 ABSRULES FOR BUILDING AND CLASSING OFFSHORE SUPPORT VESSELS .2017 Notice No. 1 July 2017 5 Design 5.12 Arrangements (1 Jul
49、y 2016) 5.12.2 Auxiliary Steering Gear Arrangements (Revise Item 4-3-5/5.12.2(b), as follows:) 5.12.2(b) In a vessel fitted with multiple steering systems, such as but not limited to azimuthing thrusters or water jet propulsion systems, an auxiliary steering gear need not be fitted, provided that: i) For a passenger vessel, each of the steering systems, is capable of satisfying the requirements in 4-3-5/5.12.1ii) while any one of the power units is out of operation; ii) For a cargo ves
