boiler retubing and steam header supply , replacement of old , weak , worn out tubes of texmaco boiler no . 1 up 3644 & boiler no . 2 up3645 , 20 ton/hr capacity as per our drawing no . blr-41 , a ) dismantling , fabrication & erection of 44 . 45 mm od super heater coil as per our drg . /sample including ss support for maintain the gap with hydraulic at desire pressure , b ) dismantling , fabrication & erection of 63 . 5mm od drum to drum tube as per drg/sample with hydraulic testing at desire pressure , c ) dismantling , fabrication & erection of 76 . 2 mm od boiler tube as per details: , 1 . drum to drum tube , 2 . drum to drum screen tube , 3 . riser tubes ( mud drum tube to front header ) , 4 . side wall tubes/front bank tube ( header to header ) , 5 . roof tubes ( steam drum to front header ) , 6 . relief tube ( steam drum to side wall header ) , 7 . soot blowing elecment 3 nos each boiler with material , dismantling , fabrication & erection of old weak/worn out tubes & super heater coils of lipi boiler no . up-4045 , 20 ton capacity as per our drg . no . blr-68 , blr-90 , a ) drum tube size 50 . 8 mm x 3 . 66 , b ) drum tube size 63 . 5 mm x 3 . 66 , c ) super heater coil 44 . 5 mm x 3 . 66 x 43 . 5 m , erection & welding of boiler feed water/steam line as per ibr , a ) size 2 nb , b ) size 3 nb , c ) size 6 nb , rate of per welding joint of boiler tubes . , a ) 63 . 5 mm od , b ) 76 . 2 mm od , rate of steam line work as per ibr , 1 ) bend , a ) size 2 nb , b ) size 3 nb , c ) size 6 nb , 2 ) flange , a ) size 2 nb , b ) size 3 nb , c ) size 6 nb , 3 ) joint , a ) size 2 nb , b ) size 3 nb , c ) size 6 nb , reclaimation of 63 . 5 mm od drum to drum tube for texmaco make boiler pressure 21 kg/cm2 , cap- 20 tphthe work includes dismantling of old tube , fabrication of new bends form new tube with welding at both end after that fiting of tubes including expend in drum with hydraulic testing at desire pressure . , replacement of damaged/leaky fin type economizer gilled coils ( elements ) by new gilled coil economizer ( heat surface area-77 m2 ) of texmaco make boiler . dismantaling of old coils & fabrication & erection of new gilled coils after repair necessary modification as per site requirement complete ibr work with hydraulic testing and ibr test certificate . specification:- design as per ibr regulation and its latest amendmintsworking test pressure= 21 kg/cm2 , hydraulic pressure= 32 kg/cm2total heating surface area= 77 m2 , size of tube 4/101 . 6 mm dia x 5050 mm long x 5 swg thick with 100 fins of 216 mm od x 3 mm thick and 42 . 8 mm pitch . material of the tubes should be ibr approved . , a ) supply of new steam distribution header size- 457 . 2 mm od x 14 . 2 cm th with inlet , outlet & drain connection ( 15 nos ) of mocsa-106 grade b with ibr test certificate as per drawing no . blr-87d , b ) erection of above steam distributor at site with necessary connection and successful trial .