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      Bolt Torques

      Lined Pipe and Fittings

      Bolting Materials should be of good quality, clean and well lubricated and to the site standard. The use of washers is recommended to ensure correct even torque. Bolts should be brought finger tight and then tightened through the use of a torque wrench in strict sequence of diagonally opposite pairs. This, and all subsequent torquing, of bolts should be undertaken at ambient temperature.


      *Torque bolts diagonally opposite each other in pairs

      Please note that PTFE is suject to cold flow or "creep".  It is therefore strongly recommended that all bolts are retorqued a minimum of 24 hours after commissioning or following the initial full process cycle. The torque of all bolted joints should then be rechecked at least annually thereafter.

      The following table gives recommended torque levels for flange to flange connections.

      Nominal Bore

      Torque

      Bolts/Studs

      Imp

      Metric

      Ft Ibs

      Nm

      Qty

      (Metric)

      (UNC)

      1"

      25

      14

      19

      4

      M12

      1/2"

      1.1/2"

      40

      20

      27

      4

      M12

      1/2"

      2"

      50

      35

      47

      4

      M16

      5/8"

            2.5"     
       65
      39
       53
      M16
       5/8"

      3"

      80

      54

      73

      4

      M16

      5/8"

      4"

      100

      40

      54

      8

      M16

      5/8"

      6"

      150

      80

      108

      8

      M20

      3/4"

      8"

      200

      100

      136

      8

      M20

      3/4"

      10"

      250

      94

      127

      12

      M24

      7/8"

      12"

      300

      107

      145

      12

      M24

      7/8"

      The torque values given above are a guide; they may be exceeded by a value of 50% to effect a seal.  If once this torque level has been reached a seal has not been achieved, it is likely that there is another cause.

      This may be due to joint misalignment or strain, or it may be that the PTFE flare face has suffered mechanical damage.  Small scratches can be removed with the use of a fine abrasive without detriment.  If damage is significant, overtightening is not a solution and the component should be rejected.

      Contact Details

      Corrosion Resistant Products Ltd
      Todmorden Road
      Littleborough
      OL15 9EG

      Phone: +44(0)1706 756400
      Fax: +44(0)1706 379567
      Email:

       

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