SCHEDA TECNICA. Sospensione per cavo 13,5 mm MS214A00 Sospensione per cavo 16,5 mm MS220A00. Description: Suspension clamp for cable 13,5mm and 16,5mm

Transcription

1 SCHEDA TECNICA Sospensione per cavo 13,5 mm MS214A00 Sospensione per cavo 16,5 mm MS220A00 Code : MS214A00 MS220A00 Description: Suspension clamp for cable 13,5mm and 16,5mm Material: Clamp body, keeper, roll pin Aluminium alloy Rubber insert EPDM Bolt, nut M10 Galvanized steel Flat washer, spring washer M10 Stainless steel O ring Elastomer Mechanical test: Visual inspection (no defect, good manufctured, etc) Dimensional test inspection Marking test inspection Assembling test

2 MS214A00 Suspension clamp for cable 13,5mm MS220A00 Suspension clamp for cable 16,5mm

3 1. Material and components description part code reference quantity Dimension material Clamp body 1 See drawing Aluminium alloy Keeper 1 See drawing Aluminium alloy Roll pin 1 See drawing Aluminium alloy Rubber insert 2 See drawing EPDM Bolt Gr M10 x 45 Galvanized Steel Nut Gr. 8 1 M10 Galvanized Steel Flat washer 1 M10 Stainless Steel Spring washer 1 M10 Stainless Steel O-ring 1 Elastomer

4 2. Dimension [mm] 2.1 Clamp body

5 2.2 Keeper 2.3 Roll pin

6 2.4 Rubber insert for cable 13,5mm 2.5 Rubber insert for cable 16,5mm 3. Material and elements features The suspension clamp must be composed by a metal sleeve with eyelet coupling in oxidationresistant material (example aluminium alloy), it can be opened, formed of two halves hinged with an rubber insert inside (EPDM). The kit is composed as below: sleeve (clamp body, keeper); roll pin; rubber insert; bolt, nut; flat and spring washers; O-ring

7 4. Processing 4.1 Aspect The suspension clamp must present the dimensional characteristics and visible aspect defined on the drawing. The aluminium alloy parts must not show cracks, flakes, inclusions, incomplete parts, straws, pores, distortions, fractures, rifling, burner and any other defects that can damage the functionality. The EPDM rubber insert must not show cracks, flakes, inclusions, incomplete parts, straws, pores, distortions, fractures, rifling, burner and any other defects that can damage the functionality. The suspension clamp must be complete and functional. 4.2 Assembling Clamp body and keeper Clamp body and keeper are assembled together by roll pin (image only for reference) Screw with washers and gasket ring Screw M10 x 45 mm Gasket ring Flat washer Spring washer

8 4.2.3 Rubber insert The two parts rubber insert must be assembled in the aluminium alloy clamps body and keeper. Once inserted and fitted in the aluminium parts, the EPDM punch that comes out from the relative holes, must be cut (see drawings below). EPDM punch EPDM punch cut off EPDM punch cut off EPDM punch Nut The nut must be placed in its relative hexagonal hole and must be fixed using an hammer to press the seal fins (see drawings below). Seal fins to be pressed after nut inserting 4.3 Marking All the materials composing the product must be marked to ensure their identification. Plastic parts are made according to standard ISO "Plastic generic identification and marking of plastic product. Identification and Marking of Plastic Product. The suspension clamp must be accompanied by the following:

9 Symbol of the supplier; Identity number for the traceability of the month, year and batch production. The number must be reported to the set of all the components of the finished product. Marking indicating the type or types of material / constituents / the product; Rubber insert for cable 13,5mm both parts Rubber insert for cable 16,5mm both parts NOTE 1: XX / XX will be month / year Example: EH - 06/11 - EPDM for June 2011 NOTE 2: The same meaning will have the marking on the keeper, EH for June 2011 Keeper

10 5. Test 5.1 Material Must be verified the material of the components: you have to ship us the material certificate. 5.2 Mechanical test Wind vibration test Purpose of test is the check of the behaviour of system amarre + cable + suspension clamp when subjected to wind vibration; the equipment is schematically represented in figure below. At the end of a section of cable of suitable length (minimum 30 m), which is intermediate to 1 km line length, are applied two amarre (4). In order to have repeatable results is necessary that the active span is at least 20 m and the total stretch is at least 30 m with suspension placed in 2 / 3 of span (6). At the end of the line, the optical fibres must be fixed properly to prevent movements on the cable. The tensile force is measured with a dynamometer (2) and the cable is subjected to a constant voltage of 90kg. The angle of the active span with the horizontal line must be between 1 and 2. The vibrator (5) must be used to vibrate the wire in the vertical plane at a frequency close as possible to the resonance frequency corresponding to a wind speed of 5 m/s, this frequency must be calculated using the following formula: where d is the outer diameter of the cable expressed in mm and V is wind speed in m / s. The peak-peak amplitude of oscillation will be equal to 0.5 d. The vibrator is placed to have at least six complete oscillations of the suspension clamp and the vibrator itself. The cable must be subjected to cycles by monitoring the amplitude of antinodo oscillation.

11 During the test the optical power must be monitored and will not detect increases of attenuation according to IEC Deviation angle test The purpose of the test is to verify that the suspension clamp does not cause increases in localized attenuation due to mechanical stress induced off by the suspension itself. The test should be performed on a section of suitable length of cable (10 15m) which is intermediate to 1km line length; at the ends of the cable must be applied two amarre and in the centre is placed a suspension. At least two optical fibers are welded in loop on the cable ends and secured properly to prevent movement relative to the cable, any increases in attenuation are detected by an OTDR measurement with a pulse of 100ns. The suspension should be anchored to a pulley (or similar equipment) and then raised to form with the cable an angle of 20 (see figure below). Subsequently, the cable system + accessories is put under traction, with a ramp 500N/min up to 90kg. On the suspension clamp has first applied a load of 270kg, than a load of 540kg; the shot is held constant for a period of at least 60 min. The two tests (suspension + 270kg and suspension + 540kg) are performed at environment temperature. During the loading ramp and at the value of 270kg, should not be detect increases in attenuation (IEC ). At 540kg should not be detected breakings or damages to the cable structure. Load Cable Deviation angle Suspension Terminations Differential load test The purpose of this test is to verify, according to the device in figure below, the reliability of the suspension clamp in case of an unbalanced load on one of the two spans. Load Cable Suspension Terminations

12 On a piece of cable of appropriate length (10 15 m) shall be applied to the two ends its relative amarre, and shall be applied at the centre a suspension, that must be fixed, through the loop coupling (1), to a support (simulating the installation phase). Later, at one end amarre must be applied a load (500N/min) parallel at longitudinal axis of the cable to slip. The test is performed with the following temperature: +20 C, -30 C, +60 C. The shift of the cable on suspension must be checked with a load between 110 and 150kg. 5.3 Resistance to atmospheric and chemical agents Salt spray The suspension clamp must be exposed in appropriate salt spray chamber according to ISO 9227, NSS method for 720 hours. At the end of the test the suspension will be put through differential load test (see 5.2.3) Acid solution The suspension must be immersed in H 2 SO 4 (PH ~ 5) solution for 720 hours. After the test, the suspension will be put through differential load test (see 5.2.3) UV resistance The insert rubber must be subjected to 2160 hours of exposure to UV according to the Standard ISO (method A, 65 C ± 3 C, 65% RH, with the second spray cycle.6.3). At the end of the test, the rubber insert must be assembled in the suspension clamp, and the suspension must be put through differential load test (see 5.2.3). 5.4 Visual inspection The absence of defects and other possible deformities must be verified. 5.5 Dimensional inspection The correct dimensions according to the drawings in para 2 must be verified