26525315
retubing of shell and tube type heat exchanger and fin fan coolers in plant 205 , 206 , 207 and other utilities during refinery iii m and i shutdown at cpcl manali refinery , part a retubing of exchangers & fin fan , part a retubing of exchangers & fin fan coolers . , retubing of exchangers , coolers , condensers , air fin fan coolers , etc . , any size & any length ( refer scope for the list exchangers planned for retubing ) the job includes reclamation of tubesheets , transverse baffles . etc . , from the tube bundle by cold cutting the tubes using band saw or by hot arc cutting & removal of the stubs inside the tubesheet portion , mechanical cleaning of the salvaged tubesheets , baffles , etc . , the job also includes transportation of new tubes from the owners storage point to the retubing maintenance shop or at work site ( for inposition retubing at site ) , cutting the extra lengths , bending of tubes , as per required , preparing the tube ends to match with tubesheet and baffles . the job also includes cutting & welding of tie rods to the required length , insertion of new tubes into the reclaimed or new tube sheet & baffles , expanding the tubes with tubesheet , attending roll leaks by re expanding , if any at exchanger site during hydrotesting , preparing both the tubesheet surfaces with necessary edge / groove preparation for seal welding ( wherever required ) , seal welding the tubes with tubesheet on both the tubesheets using suitable filler wire / electrodes , providing assistance to rotate the bundle for doing seal welding on the next tubesheet , assistance for dpt of seal welds , reaming & re expansion of the seal welded tubes , transporting the scrap material to the designated place . the job also includes supply of sufficient number of the following machineries with manpowers to carryout and complete retubing job as per the enclosed scope of work 1 . tube cutting machines 2 . tube pulling machines 3 . welding machine 4 . drilling machines 5 . tube expanders 6 . grinding machines 7 . welding machines . and any other tools and takles along with all accessories and consumables to complete the job with in the stipulated time duration . , retubing of shell & tube type heat exchanger ( floating head type ) , retubing of shell & tube type heat exchanger ( excluding seal welding ) floating head type , unit ea = per tube tube size: up to 1 od tube thick: up to 2 . 5 mm tube moc: cs , as , ss , brass . , retubing of fixed tube bundle at equipment site , retubing of fixed tube bundle at equipment site . including shell hydro testing . unit ea = per tube tube size : up to 1 od tube thick : up to 2 . 5 mm tube moc: cs , as , ss , brass . , fin fan cooler retubing , fin fan cooler bundle retubing including tube hydro testing at retubing yard . unit ea = per tube , lube oil coolers coolers retubing , lube oil coolers no . of tubes less than 75 , length of tube upto 2 mtr , tube size lessthan 3/4 retubing . unit ea = per bundle , seal welding ( strength welding ) of tubes with tube sheet of exchangers / coolers note: all welding electrodes , machine & other consumables and accessories are in contractor scope . notes for retubing: ( 1 ) refer detailed scope of work & list of exchangers for tube size , material details for retubing in plant 205 , 206 & 207 . ( 2 ) for measurement , number of tubes for any exchanger shall be as per the relevant drawings . in case of non availability of drawings , actual no . of tubes on the equipment shall be taken for measurements . ( 3 ) for retubing u tube bundle exchangers , the number of tubes for measurement shall be 1 . 5 times the number of u tubes retubed . ( 4 ) hydro testing of the retubed fixed tube bundle and fin fan coolers are included in this contractor scope . , carry out seal welding of tubes with tubesheet using er70s2 filler wire . , seal welding of tubes with tubesheet using er80s 2 b2 filler wire . ea = per side of tube to tube sheet joint , hydrogen baking out / diffusion , hydrogen bake out ( hydrogen diffusion ) of seal welded exchanger tube sheet ( 205 e 07 ) a ) heating shall be carried out by electrical resistance elements . b ) heating coil shall be installed from the outside of the shell . c ) thermocouples shall be placed in sufficient nos . both from inside as well as from outside . d ) sufficient amount of insulation shall be applied from both the sides so that uniform heating is ensured throughout the thickness of the shell . e ) vendor shall carryout hydrogen diffusion/ stress reliving as per cpcl standard procure . h ) if required vendor will have to carry out stress relieving of different weld joints as per applicable code or as required by cpcl inspection . i ) any minor changes in the hydrogen diffusion process if advised by mi , should be accommodated without any additional cost to cpcl . j ) preheating of tube sheet during seal wedling also to be done , tube sheet machining for removal of the old seal weld bead in tube sheets in stationary and floating tube sheets the job inlcudes collection of tube sheet and transportation to vendor work shop or out side cpcl with proper cisf returnbale material gate pass and carryout machining of the old seal weld bead in tube to tube sheet area of all tubes and remove all the tubes from tube sheets and clean the groove areas as per eic instructions . job includes to and fro transportation of the tube sheets . , carryout machining of tube sheet od above 1201mm and upto 1300mm , and thickness up to 100mm . ( unit of measurement ea = per tube sheet ) , carryout machining of tube sheet od above 1301 mm and upto 1400mm , and thickness up to 100mm . ( unit of measurement ea = per tube sheet ) , bending of u tubes using hydraulic machine & stress relieving of tubes for retubing of u tube bundles . cpcl will provide straight tubes only . contractor shall collect the same and carryout bending of straight tubes in to u tubes to the required radius as specified in the drawing & standards by using hydraulic machine . the job includes loading , transport of all tubes to the vendor site / outside cpcl permises with valid e way bill ( for bending ) transport back the u bended tubes back to cpcl site and unloading . the job also includes stress relieving at u bend portion as per eil spec 6 15 006 rev 2 to be carried out . hardness to be verified after stress relieving . necessary tractor trailer & loading / unloading at the vendor site is included in the contractor scope . , bending of straight tubes to the radius 35 mm to 100mm . , bending of straight tubes to the radius101 mm to 150 mm . , bending of straight tubes to the radius: 151 mm to 200 mm . , bending of straight tubes to the radius: 201 mm to 300 mm . , bending of straight tubes to the radius: 301 mm to 400 mm . , bending of straight tubes to the radius: 401 mm to 550 mm . , heat treatment / stress relieving of bend u tubes as per eil spec 6 15 006 rev 2 heat treatment / stress relieving of the bended tubes at u bend poriton as per the eil standard . heating to be carried out in furnace or by using an electric resistance or indution heating euipment ensuring uniform temperature atainment at all points of the portion being heat treated . the portion under heat treatment shall be wrapped suitably under insulation to avoid any harmful temperature gradient . the temperature thus attained in the portion under heat treatment shall be recorded by means of thermocouples , pyrometer and an automatic temperature recorders suitably calibrated should be employed . the calibration chart of each recorder along with hardness test results shall be submitted to engineer in charge for approval . the details of heat treatment such as heating rate , soaking temperature pause period and cooling rate etc to be carried ou...
Due Date : January 12, 2021
Tender Value : ₹ Ref. Documents
