Tubular Supporting Structure

Structures are designed to support plant and other equipments in borosilicate glass 3.3. These structures are available in the form of modular system that not only meet standard requirement but also facilitate solutions for problems of unique nature. These structures consist of steel tubing’s, which are connected using the appropriate fittings.


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Tube Size

Since there are various terminologies in common uses to determine tube size, the following table is given to compare and relate them to the fitting size reference.



TUBE INCHES DIAMETER NOMINAL BORE mm EXTERNAL DIAMETER mm
½” 15 19.5
1” 25 32.5
1 1/4” 30 41.5
1 1/2” 40 48.3
2” 50 60.3


Supporting Column

In the design of tubular structure to support glass process plant and pipeline equipment, a number of basic rules should be followed.

  1. The structure should be stiff and should always be braced back to the nearest building or other stiff feature to give lateral support.
  2. All glass units are built up from a fixed point on which whole weight of the column should be taken. If a total load exceeds the allowable limits, counter balance supports should be used to relieve excessive weight.
  3. All Glass unit and their structures expand at different rate as a result of change in temperature. The unit must, therefore, not be subjected to any vertical restraint above the fixed point. Due to this guide are used which give lateral support without affecting vertical movement of the glass relative to the supporting structure. The distance between guide frames must not exceed 3 meters.


Structures Fittings

Following structure fittings are available to use with galvanized lron or SS tubes in order to form a tubular structure of a glass plant. This fittings are made of cast iron and stainless steel are suitable to the tubes described as earlier.

These slidable fittings are provided with grub screws to fix it at required position on tubes.

These fittings are specially made to provide enough flexibility for future modification without involving any hammering and welding.



General Data


JMR

NB TUBE DIA ID OD d
25 32.5 35 45 1/2”
30 42.5 45 55 1/2”
40 48.3 51 61 1/2”
50 60.3 63 73 1/2”








Base

These are to be used with vertical tubes. Holes are provided for foundation.


JMR

NB Reference For C.I. Reference For S.S.
25 SBS 25 SBS 25/SS
30 SBS 30 SBS 30/SS
40 SBS 40 SBS 40/SS
50 SBS 50 SBS 50/SS




Coupler

These are generally used to couple the vertical tubes where more length is require.


JMR

NB Reference For C.I. Reference For S.S.
25 SCL 25 SCL 25/SS
30 SCL 30 SCL 30/SS
40 SCL 40 SCL 40/SS
50 SCL 50 SCL 50/SS




Bend

These are used to build frames on vertical tubes.


JMR

NB Reference For C.I. Reference For S.S.
25 SBN 25 SBN 25/SS
30 SBN 30 SBN 30/SS
40 SBN 40 SBN 40/SS
50 SBN 50 SBN 50/SS



Tee


JMR

NB Reference For C.I. Reference For S.S.
25 ST 25 ST 25/SS
30 ST 30 ST 30/SS
40 ST 40 ST 40/SS
50 ST 50 ST 50/SS


Double Bend


JMR

NB Reference For C.I. Reference For S.S.
25 SDB 25 SDB 25/SS
30 SDB 30 SDB 30/SS
40 SDB 40 SDB 40/SS
50 SDB 50 SDB 50/SS



Double Tee


JMR

NB Reference For C.I. Reference For S.S.
25 SDT 25 SDT 25/SS
30 SDT 30 SDT 30/SS
40 SDT 40 SDT 40/SS
50 SDT 50 SDT 50/SS





Equal Bracket


JMR

NB Reference For C.I. Reference For S.S.
25 SEBT 25 SEBT 25/SS
30 SEBT 30 SEBT 30/SS
40 SEBT 40 SEBT 40/SS
50 SEBT 50 SEBT 50/SS




Unequal Bracket


JMR

NB Reference For C.I. Reference For S.S.
25 SUBT 25/15 SUBT 25/15/SS
30 SUBT 30/15 SUBT 30/15/SS
30 SUBT 30/25 SUBT 30/25/SS
40 SUBT 40/25 SUBT 40/25/SS
50 SUBT 50/25 SUBT 50/25/SS



Cross


JMR

NB Reference For C.I. Reference For S.S.
25 SX 25 SX 25/SS
30 SX 30 SX 30/SS
40 SX 40 SX 40/SS
50 SX 50 SX 50/SS



Support


JMR

NB Reference For C.I. Reference For S.S.
15 SFSPT 15 SFSPT 15/SS
25 SFSPT 25 SFSPT 25/SS
30 SFSPT 30 SFSPT 30/SS
40 SFSPT 40 SFSPT 40/SS
50 SFSPT 50 SFSPT 50/SS



Plugs

These are used to plug the open ends of galvanised tubes.


JMR

NB Reference For C.I. Reference For S.S.
15 SPL 15 SPL 15/SS
25 SPL 25 SPL 25/SS
30 SPL 30 SPL 30/SS
40 SPL 40 SPL 40/SS
50 SPL 50 SPL 50/SS



Studs

These are used as screwed rods with supports


JMR

d Reference For C.I. Reference For S.S.
5/6” SST 5/16-200 SST 5/16-200/SS
3/8” SST 3/8-200 SST 3/8-200/SS
½” SST 1/2-200 SST 1/2-200/SS



Grub Screw


NB Reference For C.I. Reference For S.S.
15 SGS 15 SGS 15/SS



Structure Dimension


Column DN Cylindrical Vessels DN Spherical Vessel Contents Ltr Structure L x W
80 - - 400 x 400
100 - - 500 x 500
150 - 5,10 600 x 600
225 - 20 700 x 700
300 450 50 800 x 800
450 600 100,200 1000 x 1000
600 - - 1100 x 1100



Counter Balance Supports

When the total weight of the column is more and it cannot be supported on fix support at the bottom, excessive weight is relieved by counter balance supports. The maximum load which can be supported on fix support and minimum force require to support the sealing of coupling are as under



JMR

DN of Column Permissible weight (kgs) Force require for sealing (kgs)
225 200 25
300 380 35
400 500 55
450 700 70
600 1000 110



The counter weight acts through two levers on the lower backing flange. The maximum lever ratio is 1:10. More than one counter balance supports can be used to relieve the excessive load keeping minimum force required to support the sealing of coupling.


PCD L Reference
310 800 SLCB 225
395 800 SLCB 300
495 1000 SLCB 400
585 1000 SLCB 450
710 1200 SLCB 600





GROUTING OF BASE




JMR

1. Take one Cast Iron BASE and four foundation Bolts, each with 2 nuts.


2. Fit the bolts in BASE so that base is raised up to 150mm from head of bolts.


3. Put this assembly on the floor and prepare a rough surface for proper bonding of grouting.


4. Make a Concrete block over the bolts of about 200 x 200 mm up to the base of BASE i.e. 150 mm high.


5. Prepare separate block for each BASE instead of making one big common block. For all BASES.
















Assembling of Structure

  • Mark the position of required fittings on all the Vertical tubes, slide them in correct sequence and lightly Tighten.
  • Assemble one side frame of the structure by adding the cross tubes between two vertical tubes.
  • Assemble other side frame of the structure by adding the cross tubes between other two vertical tubes.
  • Build up the cross tubes in one side frame and Tighten lightly.
  • Add the other side frame on it and tighten all the fittings firmly.
  • Hoist the structure and brace it to some existing rigid feature.
  • Grout the foundation bolts and fix the structure bases with that.
  • Adjust bracing to obtain a correct plumb in structure.
  • Adjust the horizontal frames in correct level.
  • Assemble the support tubes at their positions.


  • Assembling of Structure



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