Standard Technical Features of BTG System for Supercritical 660 ...

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Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsv) For cavitation service, only valve with anti cavitation trim shall beprovided. Applications like CEP minimum recirculation valve shallhave anti-cavitation trim with tight shut-off. The deaerator levelcontrol valve shall have characterized trim cages to have a cavitationprotection at minimum flow as well as good rangeability.18.3 Thermal Insulation18.3.1 General requirementsi) Thermal insulation shall be provided mainly for conservation of heatand maintenance of temperature as per design cycle and personnelprotection.ii)iii)iv)Insulation alongwith aluminum cladding shall be provided for all theequipments/surfaces (excluding coal pulverisers) having skintemperature more than 60 0 C.For the piping and the equipment with surface operating temperature of60 0 C and above, the personnel protection insulation shall be appliedsuch that the temperature of protective cladding is below 60 0 C.An insulation thickness schedule shall be prepared covering both thecases of heat conservation and personnel protection based on thefollowing design data:a) Design ambient temperature : 40 0 Cb) Maximum cladding temperature : 60 0 Cc) Wind speed : 0.25m/sd) Emissivity of cladding : 0.2e) Thermal conductivity : As per relevant ISf) The minimum acceptable : 1. 75 mm for Boiler & TGinsulation thickness2. 70 mm for ESP surfaces3. 25 mm for other surfacesg) Pipe/equipment wall temperature : Fluid design temperaturev) The insulation thickness to be provided shall be calculated as perASTM C-680 or BS- EN-ISO 12241 subject to minimum thicknessvalues as mentioned above.vi)The material and application of insulation material, protectivecladding, wire mesh etc. shall conform to the latest edition of thefollowing standards/ codes:181
Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsa) IS 280 Mild steel wires for general engineeringpurposes.b) IS 3144 Methods of test for mineral wool insulationmaterials.c) IS 3677 Unbonded rock and slag wool for thermalinsulation.d) IS 5696 Loose mineral wool.e) IS 8183 Lightly bonded mineral wool for thermalinsulation.f) IS 9428 Pre-formed calcium silicate insulation.g) IS 9742 Sprayed mineral wool thermal insulation.h) IS 9842 Preformed fibrous pipe insulation.i) IS 4164 Code of practice for thermal insulation on coldsurfaces.j) IS 15402 Ceramic fibre blanket insulation.k) IS 737 Wrought aluminum and aluminum alloy sheetand strip for general engineering purposes.l) ASTM C 892 Standard specification for high-temperaturefiber blanket thermal insulation.m) ASTM B 209 Standard specification for aluminum andaluminum- alloy sheet and plate.18.3.2 Technical requirementsi) All insulating materials, accessories and protective covering shall benon-sulphurous, incombustible, low chloride content, chemically rotproof, non-hygroscopic and shall be guaranteed to withstandcontinuously and without deterioration the maximum temperature towhich they will be subjected under the specified conditions.ii)Insulation materials containing asbestos in any form shall not be used.iii) Insulation mattress/section shall be in thickness of 25, 40, 50 and 75mm. Insulation of higher thickness shall be made up in multiple layersusing these mattress/slabs. If required, the mattress/slabs in incrementof 5mm thickness may be used to achieve the required thickness ofinsulation.iv) Special fire protection measures shall be taken for the steam linesrunning in the immediate vicinity of oil lines. The sheet metaljacketing shall be made oil proof by inserting self-adhesive flexibletapes.v) Rock wool insulation mattress shall be of long fibered rock processedinto fibrous form bonded with a binder. No kind of slag woolinclusion is acceptable.182
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