Dome Mechanical Seal Fiber Optic Splice Closure (FOSC) SNR-H

- Dec 17, 2018-

The process of installing FOSC.

1.1   Step One - Open the closure

1.1.1      Cleaning the locale and determine where to install the FOSC and then place

           fiber cables required.

1.1.2      Check whether the main components and accessories have been well prepared

           inside the package.

1.1.3      Open the closure

      Demount hoop fixing bolt and pull hoop locking system out, then proceed in

    demounting the hoop.

    Pull the left and right housings out to two ends, installation could begin.   

1.1.4       See Drawing 1

Important issues: If the weather condition is not good enough, then a tent must be pitched for waterproof and dustproof.


1.2  Step Two -Determine length of fiber cable to be fixed and stripped inside FOSC

1.2.1   . Fiber cable in 90mm length: the distance from small gasket ring to fiber cable pressboard

. Fiber cable in 2000mm length: it is used to be winded and spliced after stripping.

    . Fiber with protective coat in 400mm length: the distance from the fixing point of fiber cable to the fixing point of FOST (fiber optic splice tray).

 . Fiber in 1600mm length: after stripping off the protective coat, it is to be winded inside the FOST after splicing with other fibers

1.2.2   See Drawing 2

Important issues:

1.       Reserve enough length of fiber cable to be spliced.

2.       Stripping length also could be decided by customer according to installation requirement.


1.3  Step Three – Strip off fiber protective coat of fiber cable and fiber

  1.3.1 Strip off protective coat of fiber cable from the temp. locating mark with the cutter and the

         stripper, please refer to Drawing 2 for stripping length. Stripping length also could be

                decided according to installation requirement

1.3.2  See Drawing 3.

Important issues:  If it is difficult to strip off all the protective coat of fiber cable at one time, strip it off section by section to avoid fiber breakage.




1.4  Step Four – Separate fiber cores and prepare work prior to fixing fiber.

1.4.1          Wind 2 layers of insulation tape on protective coat of fiber. Meanwhile, get rid of the stuffing to separate fiber and clean them. Form a ring with the diameter of 100mm or so and fix it on the fiber temporarily by adhesive tape.

     1.4.2   This FOSC is provided with 4 inlet/outlet ports. Number of fiber cables is determined

by the customers according to their actual requirements and the corresponding number

of port plugs should be taken out. The max number of fiber cables to be installed is 4. , The max diameters of fiber cables are all 16mm.

1.4.3  This FOSC is suitable for fiber cables with diameter ф16mm.

  1.4.4  The corresponding inlet/outlet ports are to be selected according to fiber cables actually

               installed. When the diameter of fiber cable is smaller than that of the inlet/outlet port,

               then the sealing tape should be used to enlarge the diameter of fiber cable.

1.4.5  Reserve reinforced core in 60mm length and cut off the unnecessary ones.

1.4.6  See Drawing 4.

Important Issues: 1. Before the seal tape is used for enlarging the fiber cable diameter, it should be scratched and to be cleaned with abrasive cloth and ethyl alcohol.

2. Cut off reinforced core with a special cutting plier.  



1.5  Step Five - Fix reinforced core and fiber cable

       1.5.1  Upon finishing the above steps, then demount port plugs, pressboard and fixing nut of

               reinforced core. Make sure to check whether the fiber cable stripped fits in with the

               fixing ports or not. If not, the adjustment should be done in time. Otherwise it will affect

               installation quality.

    1.5.2  Insert fiber cable prepared into the FOSC.

1.5.3  Tighten fiber cable pressboard. If the diameter of fiber cable is not long enough, then

        enlarge it with insulation tape.

1.5.4  Tighten nut of reinforced core with the special wrench (plastic) and then retighten it with

        the metal wrench (the metal wrench should be provided by operator). 

1.5.5  See Drawing 5


1.6  Step Six - Splice fibers

         1.6.1     Follow user manual of fusion splicing machine to splice fibers.

Important issue: pay attention to the twist and bend of fiber.


1.7   Step Seven -Install heat shrinkable protective sleeve and house fibers

         1.7.1  When having completed splicing the fibers, the first fiber ring should be housed

                   on the farthest side of FOST, the remaining fiber should be winded, forming a ring

                   with diameter not less than 80mm. then put it into FOST (Fiber Optic Splice Tray)

 together with heat shrinkable protective sleeve.

( Firstly fix heat shrinkable protective sleeve into the slot, then enlarge the diameter of

fiber ring properly.)

     1.7.2  See Drawing 6

Important issue: pay attention to the twist and bend of fiber.


1.8  Step Eight - Check up comprehensively

To ensure the technical requirements, the following instructions must be followed:

1.8.1 The fibers in the FOST are spliced and installed orderly. The curved diameter

              of fiber meets with the technical requirements.

1.8.2    The internal tighteners are tightened.

1.8.3    The inlet/outlet ports without fiber cables must be blocked up with the original port


1.8.4      Control the amount of seal tape within a proper range.

1.8.5      Seal fitting is installed neatly and smoothly. If not, level it up with seal tape.

1.8.6      See Drawing 7


1.9  Step Nine – Assemble FOSC housing

  1.9.1  Insert one end of foundation into one end of orbit of FOSC, then hitch another end of

    orbit of FOSC to another end of foundation properly.

         1.9.2  Install plastic hoop between left and right housing,  tighten hoop locking system,

 which is to be fixed by hoop fixing bolt then.

           1.9.3  Please refer to Drawing 8.




1.10  Step Ten – Fix FOSC

1.10.1  Fix FOSC by tightening octagonal nut.

1.10.2  If for aerial application, hanging hook is to be installed.


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