3613_242_A.PDF
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TP: 3613
(HM&E MANUAL)
TECHNICAL MANUALS
FLEXIBLE COUPLING
AMERICAN VULKAN CORPORATION
DISTRIBUTION STATEMENT D. - Distribution authorized to Department of Homeland Security, DoD and their contractors to protect publications required for official use or for administrative or operational purposes only, determined on 7 January 1997. Other requests for this document shall be referred to Commander, USCG Surface Forces Logistics Center, ESD - Tech Info Mgmt Br, 2401 Hawkins Point Road (M/S 25), Baltimore, MD 21226
WARNING – This document contains technical data whose export is restricted by the Arms Export Control Act (Title 22, U.S.C., Sec 2751, et seq.) or the Export Administration Act of 1979 (Title 50, U.S.C., App. 2401 et seq.), as amended. Violations of these export laws are subject to severe criminal penalties.
DESTRUCTION NOTICE. - For unclassified, limited documents, destroy by any method that will prevent disclosure of contents or reconstruction of the document.
PUBLISHED UNDER AUTHORITY OF THE U.S. COAST GUARD
SWBS 242
SECTION: A
Department of Homeland Security
UNITED STATES
COAST GUARD
Individual Manual Application Sheet
Technical Publications Number
Section Applicability
SWBS Number 242 SWBS Element Title PROPULSION CLUTCHES AND COUPLINGS
Section Identifier A
Equipment Functional Description FLEXIBLE COUPLING
CI Functional Description ESWBS Code Remarks
Planset Hulls
175-WLM 551, 552, 553, 554, 555, 556, 557, 558, 559, 560, 561, 562, 563, 564
MAINTENANCE
SEE SECTION 2 FOR SAFETY PRECAUTIONS
5-4 AVC RATO-R SM 6 / 97
5.4.1.3 Torsional Set
When torque is applied to a RATO-R flexible coupling, one side of a coupling segment will be displaced in the direction of the applied torque relative to the other side (see figure 5-3). If the permanent torque set exceeds the criteria in Table 5-1, in the stationary condition, the RATO-R rubber elements must be replaced. If the torque set does not exceed the criteria, the elements are acceptable for further service provided there are no other indications of distress. It is advisable to determine and eliminate the cause(s) of torsional set in excess of the values for S in Table 5-1 before installing replacement elements.
Table 5-1 Limits of Torsional (S)et in RATO-R Flexible Elements.
RATO-R SIZE Stiffness 1 Stiffness 2 Stiffness 5 Stiffness 7 inch mm inch mm inch mm inch mm 161x 0.91 23.0 0.55 14.0 0.82 20.8 0.98 25.0 171x 0.98 25.0 0.59 15.0 0.88 22.3 1.06 27.0 191x 1.06 27.0 0.63 16.0 1.06 26.8 1.14 29.0 211x 1.14 29.0 0.71 18.0 0.95 24.1 1.26 32.0 231x 1.22 31.0 0.75 19.0 1.09 27.8 1.38 35.0 251x 1.38 35.0 0.83 21.0 1.17 29.7 1.54 39.0 271x 1.50 38.0 0.91 23.0 1.27 32.2 1.65 42.0
271x* 0.91 23.0 0.55 14.0 1.25 31.8 1.02 26.0 291x 1.57 40.0 0.94 24.0 n/a n/a 1.77 45.0
291x* 0.98 25.0 0.59 15.0 1.00 25.5 1.06 27.0 311x 1.77 45.0 1.06 27.0 1.48 37.5 1.97 50.0 331x n/a n/a n/a n/a 1.06 27.0 n/a n/a
331x* 1.18 30.0 0.71 18.0 1.05 26.6 1.30 33.0 341x 2.01 51.0 1.18 30.0 1.15 29.2 2.20 56.0
341x* 1.54 39.0 0.91 23.0 1.15 29.2 1.65 42.0
* 3 Row Elements
NOTE
Measure the amount of torsional set S at the outer diameter of the coupling segment.
Fig. 5-3 Torsional set in RATO-R elements
Amendment 9
| BACK TO FRONT MATTER |
| COVER PAGE |
| INDIVIDUAL MANUAL APPLICATION SHEET |
| 242 - A - FLEXIBLE COUPLING |
| TABLE OF CONTENTS |
| SECTION 1 - RATO-R FLEXIBLE COUPLING |
| 1.1 Features and Benefits |
| 1.2 Performance |
| 1.2.1 Selection |
| 1.2.2 Installation |
| 1.2.3 Alignment |
| 1.2.4 Temperature |
| 1.2.5 Environment |
| 1.2.6 Severity of Service |
| SECTION 2 - SAFETY |
| 2.1 Notes, Cautions, Warnings |
| 2.2 Precautions |
| SECTION 3 - ALIGNMENT |
| 3.1 Purpose of Alignment |
| 3.2 Types of Misalignment |
| 3.3 Alignment Criteria |
| SECTION 4 - INSTALLATION |
| 4.1 Preliminary Steps |
| 4.2 Installing RATO-R Flexible Couplings |
| 4.2.1 RATO-R Series 2210 |
4.3 Element Assembly
| SECTION 5 - MAINTENANCE |
| 5.1 Service Interval |
| 5.2 Access to RATO-R Flexible Couplings |
| 5.3 Dismantling RATO-R Flexible Couplings |
| 5.3.1 RATO Series 2210 |
| 5.4 Inspection |
| 5.4.1 RATO-R Flexible Elements |
| 5.4.1.1 Temperature |
| 5.4.1.2 Environment |
| 5.4.1.3 Torsional Set |
| 5.4.1.4 Cracks |
| 5.4.1.4.1 Crack Assessment |
5.4.1.5 Complete Separation of Rubber
| 5.4.2 Inspecting Metal Components |
| 5.4.2.1 Cracks, Porosity & Other Signs of Distress |
| 5.4.2.2 Bolt Holes No Longer Round |
| 5.4.2.3 Damaged Fasteners |
| 5.5 Replacement Parts for RATO-R Couplings |
| 5.6 Assembling RATO-R Flexible Couplings |
| 5.6.1 RATO-R 2210 Series |
5.7 Coupling Alignment
| APPENDICES |
| A - Alignment Technique |
| A.1 Purpose of Alignment |
| A.2 Factors Affecting an Alignment |
| A.2.1 Foundation or Baseplate |
| A.2.2 Adjucting Screws |
| A.2.3 Thermal Expansion |
| A.2.4 Resilient Mounts |
| A.3 Alignment Criteria |
| A.4 Axial Alignment |
| A.4.1 Shaft Hubs |
| A.4.2 Position Equipment |
| A.4.3 Position Shafts |
| A.4.4 Shaft-to-Shaft |
| A.4.5 Flywheel-to-Shaft |
| A.5 Radial and Angular Alignment |
| A.5.1 Total Indicator Reading (TIR) |
| A.5.2 Dial Indicator Bracket Sag |
| A.5.3 Apparatus for Measuring Rim Displacement |
| A.5.4 Apparatus for Measuring Face Displacements |
| A.5.5 Taking Rim and Face Displacement Readings |
| A.5.6 Corrected Displacement Readings |
| A.5.7 Validity Check |
| A.5.8 Comparing Displacement Reading with Alignment Criteria |
| A.5.9 Equipment Movements |
| A.5.10 Secure Equipment |
| H - Hub |
| H.1 Hub Installation |
| H.1.1 Preliminary Steps |
| H.1.2 Hub with Interference -- Shink--Fit |
| H.1.3 Hub with Interference--Hydraulic--Fit |
| H.1.4 Hub with Tapered Bore |
| H.1.5 Finishing an Unbored Hub |
H.2.1 Hub Removal, Figure H-2
| S - Assistance |
| S.1 Coupling Identification |
| S.2 Contact AVC |
| S.3 Product Support |
| S.4 Spare Parts |
| S.5 Returns |
| T - Bolt Torque |
| T.1 Torquing Bolts and Nuts |
| T.1.1 Procedure for Tightening Joints |
| T.2 Torque Values for Metric Bolts |
| T.3 Torque Values for Metric Bolts |
| T.4 Torque Values for SAE Bolts |
| TERMS |
| AVC Terms and Conditions of Sale |
| DRAWING |
| Drawing No. 1G17204004, Coupling RATO-R 1720-2210/18 |
| Parts List |
| LIST OF FIGURES |
| Fig. 3-1 Types of Misalignment |
| Fig. 4-1 Installing RATO-R 1721 Series 2210 |
| Fig. 4-2 Installing RATO-R 1721 |
| Fig. 4-3 Installing RATO-R 1721 |
| Fig. 4-3 Element Assembly |
| Fig. 4-4 Orient the Match Markings of the Elements |
| Fig. 4-5 Install the Inner Stop Ring |
| Fig. 5-1 Element Removal |
| Fig. 5.2 Membrane Clamping Bolt (DO NOT REMOVE) |
| Fig. 5-3 Torsional Set in RATO-R Elements |
| Fig. 5-4 Bulges and Cracks due to Thermal Overloading |
| Fig. 5-5 Complete Separation of RATO-R Element |
| Fig. A-1a Shaft-to-Shaft |
| Fig. A-1b Flywheel-to-Shaft: "A" Reading |
| Fig. A-1c Flywheel-to-Shaft: "B" Reading. |
| Fig. A-1d Flywheel-to-Shaft: Thickness Reading |
| Fig. A-2a Rim Displacement Readings |
| Fig. A-2b Face Displacement Readings |
| Fig. A-3a Rim Bracket Sag |
| Fig. A-3b Face Bracket Sag |
| Fig. A-4a Rim Displacements |
| Fig. A-4b Face Displacements |
| Fig. A-5a Rim Displacement Readings including Rim Bracket Sag |
| Fig. A-5b Face Displacement Reading including Face Bracket Sag |
| Fig. A-6 Validity Checks |
| Fig. H-1 Advance of a Hub on a Tapered Shaft |
| Fig. H-2 Removing a Hub |
| Fig. S-2 Return Material Tag |
| LIST OF TABLES |
| Table 3-1 Alignment Specification for RATO-R Couplings |
| Table 5-2 Limits of Torsional (S)et in RATO-R Flexible Elements |
| Table 5-2 Limit of Crack Depth in RATO-R Flexible Elements |
| Table T-1 Torque Values for Grade 8.8 Metric Bolts, Unlubricated |
| Table T-2 Torque Values for Grade 10.9 Metric Bolts, Unlubricated |
| Table T-3 Torque Values for Grade 8.8 Metric Bolts, Lubricated |
| Table T-4 Torque Values for Grade 10.9 Metric Bolts, Lubricated |
| Table T-5 Maximum Torque Values for Metric Bolts through Cast Aluminum Housings, Unlubricated |
| Table T-6 Maximum Torque Values for SAE Bolts through Cast Aluminum Housings, Unlubricated |
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