High Grade Iron Pipe Fittings
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 Features of TM Pipe Fittings

   a) Standards

        TM fittings are produced in accordance with the following national or international standards depending on customers' requirements:

     American standards:

         *   ASME B16.3

               Malleable Iron Threaded Fittings

         *   ASME B16.39

                Malleable Iron Threaded Pipe Unions

         *   ASME B16.14

                Ferrous Pipe Plugs, Bushings, and Locknuts with  Pipe Threads

         *   ANSI / ASME B1.20.1


   British standards:

         *   BS143 & 1256

                Threaded pipe fittings in malleable cast iron and cast copper alloy

         *   BS 21

                Pipe threads for tubes and fittings where pressure-tight joints are made on the threads  (metric dimensions)

         *   BS EN 10242          

                Threaded pipe fittings in malleable cast iron  

    ISO standards:

         *   ISO 49

                Malleable cast Iron fittings threaded to ISO 7-1

         *   ISO 7/1

                Pipe threads where pressure- tight joints are made on the threads-Part 1:                                                                                      Dimensions, tolerances and designation

      b) Material

           TM fittings are manufactured of black heart malleable iron (the microstructure is shown on below picture). Our iron is melted and refined in electric induction furnaces, and annealed with extreme care.

    TM malleable iron has mechanical properties superior to those specified by various national / international standards for pipe fittings.

    This superiority is shown by the following two figures, in which the Tensile Strength and Elongation of TM malleable iron are compared with the specifications specified in some national standards.

(Figures of Comparison of Tensile Strength and Elongation)



     C) Coating

           TM fittings are available either galvanized or black. Galvanized fittings have an average coating thickness of 86 micrometers or average coatings weight of 610 g/m² or higher.

       D) Applications

           TM fittings are suitable to be used either for steam,air,water,gas and oil pipes or for many other fluids.

           The recommended working pressure under specified temperatures are rated as follows :

Constituents of Internal Fluid
Maximum Working Pressure
Steam,Air,Gas and Oil at 300 ° C
10 kg/cm²
Steam,Air,Gas Oil and water at 200 ° C
14 kg/cm²
Water Non-shock at 120 ° C
20 kg/cm²

Distance and Tolerances

    The important dimensions of TM pipe fittings are shown in the tables on Dimensions Specification  for  BS EN Standard, Dimensions Specification  for  American Standard, Quality and Economy Our Ultimate Goals.Except where stated as minimum dimensions, tolerances on face-to-face, face-to-centre and centre-to-centre dimensions shall be in accordance with below table.

End Shapes and Threads

     The end shapes of TM pipe fittings are illustrated on Dimensions Specification  for  BS EN Standard       and   Dimensions Specification  for  American Standard. Our Company manufactures quality pipe fittings with different     end-shapes,  mainly banded, but also beaded or plain,      which are supplied upon our customers' preference.

      TM pipe fittings are tapped according to BS 21 or ANSI / ASME B1.20.1 or ISO 7/1 standards, upon the customers' specifications and requirements.Threads can also be machined following German standard (DIN 2999) whenever requested by our customers. All the threads are chamfered to assist assembling and avoid "cross threading".  



    Tmis - High Grade Pipe Fittings
 © 2003 Thai Malleable Iron & Steel Co.,Ltd.. All rights reserved.