Main products of «TMM-ENERGOBUD MANAGEMENT LTD» pipeline production are I-IV category steam and hot-water pipelines according to Federal norms and rules in the field of industrial safety “Industrial safety rules for hazardous production facilities that use equipment operating under excessive pressure” and Standards for thermal power plant steam and nuclear power plant pipelines elements according to Codes and standards for nuclear-power engineering NP-089-15, ASME, EN, OST 108.030.123-85, OST 10.030.124-85
Pipelines are delivered as packaged details, assembly units and aggregative units (blocks) of pipelines. A block consists of two and more shaped elements or assembly units jointed with each other by means of welding according to design documentation (block draft). We supply our pipelines abroad according Harmonized Commodity Description and Coding System, code 7308 90 98.
Shaped elements and assemblies of pipelines are:
As primary parts for manufacturing are used seamless pipes, forged pieces and profiled iron. For pipelines transporting steam with the temperature to 545°C and under the pressure of 255 kg/cm2 are used steel types 20, 15GS, 16GS, steel 12H1MF, 15H1M1F, 08N18N10T etc. and for pipelines with heightened parameters of working medium (temperature to 650°C, pressure 350 kg/sm2) are used high-temperature materials such as P-91, P-92 (Germany, the USA), 10H9MFB (Russia). Wall thickness of raw material reaches 80 mm, external diameters reach 1000mm, designed speed of working medium inside the pipeline is 40-60 m/sec. All in the production used materials have to correspond to the Rules of setup and safe use of steam and hot water pipelines.
Bent branches Dy 10-200 mm with R≥3,0Dн are made by cold bending with winding on sectors. Short radius bent branches Dy 50-500mm with wall thickness to 75 mm and bend radius R≥1,4Dн and branches Dy 200-1000 mm with wall thickness to 100 mm are get by bending with induction heating.
Conditions of bending processes on all the benders are accompanied by automatic check and bending protocol.
Welded transitions Dy 400-2440 mm and cylinder courses with wall thickness to 20 mm are made from parent sheets by cold bending on sheet-bending machines with the further joint welding.
For cutting out tubular and sheet billets are used in manufacture plasma-arc and oxygen cutting NC machines and also machine-made severing with the following edge machining. Interior and external surfaces and edges are treated for welding on lathes, mills, horizontal borers and purpose-designed edge-milling machines.
Thermal treatment of details is carried out in 56 m3 gas and 10 m3 electric bogie furnaces and by local heat treaters with devices for automatic process monitoring.
Manual electric-arc welding with coated electrodes, manual and automatic argon-arc welding, machine argon–arc welding with consumable electrodes and automatic hidden arc welding are also used at the Plant. Welding of pipelines elements is carried out with the equipment, which meets the legal requirements RD 03-614-03.
Welding procedures are certificated for M1 and M02 materials of pipelines for thermal power plants RD 03-615-03.
Welding superintendent and welders are certified in compliance with the PB 03-273-99 requirements.
Shaped elements, assembly units and blocks of pipelines are delivered according to the standards and standard drawings of Design Service the customers to erection site, aggregated and assembled into a pipeline in compliance with the project. After assembly and checking the pipeline is brought into operation.