TECHNICAL DATA: The æ4" (Æ114.3 x 5.56) for the transport of liquefied petroleum gas (LPG – a mixture of propane and butane) was built originally from Ivanic Grad (ETAN plant) to the then oki factory. Approximately 25 years ago, the product was extended from the existing connection on the eastern side of the FACTORY OKI (stationary 0 ± 00) to the INA – GAS warehouse (now PROPLIN) on Radnička cesta 216 (stationary 4 + 834,50). The product is buried in the ground at an average depth of 1.2 –1.6 m. At the point of intersection with the drainage channel (GOK) the product flows over the water face on a purpose-built pipe bridge 30.70 m long . The current point of passage of the existing GOK (pipe bridge) is abandoned and as a new support is used a concrete bridge designed for the needs of the steel water supply pipeline DN 1000. The product is laid in a trench 0.60 m wide on the planned sand base 10 cm thick. In a belt 5 m wide on one side of the pipeline (calculated from its axis) it is forbidden to plant plants whose roots grow deeper than 1 m i.e. for which it is necessary to process land deeper than 0.5 m. After the construction of the productovoda is prohibited in the belt 30 m wide (left and right of its axis) to build buildings intended for housing or living of people, regardless of the degree of safety of the built pipeline. The minimum instillation depth of the pipeline, measured from the upper edge of the pipe, shall be: - from the bottom of the drainage ditches of roads>1,00 m - from the bottom of regulated water flow troughs>1,00 m - from the top edge of the road>1.35 m - from the upper edge of the railway threshold>1.50 m - from the upper edge of the industrial track>1.00 m - from the bottom of unregulated water flow troughs>1.50 m The projected pipeline will be made from (according to physical and chemical properties) of the corresponding steel pipes. For protection against corrosion, pipes are factory pre-insulated with extruded polyethylene of PE 80 or PE 100. Steel pipes and fittings intended for installation in the designed pipeline must correspond to Croatian or foreign standards and standards: All fittings and shut-off organs as well as safety and control equipment are designed with rated pressure NP 40, i.e. class 300 according to the US ANSI standard. In places of horizontal or vertical route turns, factory-made pipe arches are required to be installed. Outside the ground, the pipes rely on steel consoles and fasten the side wall of the concrete bridge for the DN 1000 water pipeline. Oslonci su konsturirani tako da ne oštećuju izolaciju. Thermal insulation of the open pipeline is performed with mineral wool cushions in the protective mantle of Al-lim. The overhead part of the pipeline is electrically separated from the underground part and must be grounded. Before the pipeline is buried, the insulation damage to the pipeline must be tested with a high-voltage detector. The strength and tightness product is tested on the basis of the pressure test. Pressure test is carried out only when all parts of the pipeline are completed and connected, including preferably, and reconnected to existing pipelines, and when they are half-cluttered. To prevent damage to any future works and to facilitate the location of the pipeline, a polyethylenic warning strip will be installed before the pipeline is finally buried at a depth of 0.5 m below the boiler course. When putting the product into operation it is necessary to disable the formation of an explosive gas-air mixture. This is achieved by inserting inert gas (nitrogen) at the beginning of the newly built section in the direction of gas flow, in this case sectional armature SA-1. At the end of the proplin production, the air or inert gas is On the projected part of the pipeline there are overhead installations that need to be protected from atmospheric discharges and accumulation of static electricity. According to the conditions of Croatian Railways it is necessary to ground the protective pipe at the crossing under the electrified railway line Sesvete - Velika Gorica. The pipeline built according to this project and if properly maintained in which the continuous operation of cathode protection can have durability for 30 to 40 years. The total length of the mixed product DN 100 is L = 144 m.
TECHNICAL DESCRIPTION: The new location of the Ministry of Justice and The Square of Justice, is located in the area of the former barracks, and borders the Selski Road, Baron Filipovic's Driveway and Cankareva Street. The DN 150 junction is connected to the existing main steamer DN 300 in pane No. 1, located in a green belt on the south side of Baron Filipovic's driveway. Under the roads (Access to Baron Filipović and Selska cesta) steam is led through the anti-security pipes DN 350. The steam is led in the classic concrete channel to the new pane No. 2 in the former barracks. The shaft is installed in the DN 65 detachment in the north direction. Connection pane No. 3 and No. 4 are scheduled for the installation of future drains to the thermal substations of existing buildings during their renovation. In pane No. 5, installs a condensed scolp, and the pane predicts a typed condensate bus. When performing the steam-operated connection for object "B", the condensate drainage will be taken to the heat substation in a condensate relief vessel. From pane No. 5 to the room of the heat substation is run steamwater DN 40. Izvan prometnice parovod DN 150 se polože u betonski kanal svijetlih dimenzija 500 x 400 mm, a parovodi DN 65, DN 50 i DN 40 su položeni u betonski kanalu 400 x 300 mm. The total length of the new junction DN 150 is 204 m and the connection is 292 m. For the construction of steam water, seamless steel pipes NP 2.5 MPa, made of material Č.1212, according to HRN C.B5.221 with the test. Pipe arches are made of the same material as pipes, with dimensions according to HRN M.B6.821 for R = 1,5 d. As an insulating material, mineral wool in pillows, in aluminium sheet wraps, with the thermal conductivity coefficient of lamda = 0.047 W/m°K is selected. Corrosion protection is provided by coating with two layers of temperature-resistant coating up to 250 C.