Dredge equiment OH

DRAGHEAD AND INTERMEDIATE GANTRY (PORT & STBD):

a) All four draghead and intermediate gantries to be dismantled completely after removing of all mountings, disconnecting hyd cylinder ram and kept ashore for inspection by shipstaff. To be fitted back with new/reconditioned heel-bush-housings after overhauling and to fit back all montings. All spares ship supply.

b) Lock plate of head roller shaft to be removed. Head roller to be overhauled and fitted back.

c) Gantry heel bushes, worn out, if any, to be renewed. The bushes to be shrunk fit on the heel pins and the gantry heel cups to rotate on the bush. Bushes ship supply.

d) Gantry heel pins and housings worn-out portions to be built-up and machined to original sizes.

i) Built-up of heel pin as per requirement

ii) Built-up of heel pin housings as per requirement

f) Grease lines to be renewed with adaptors/unioin fittings and fitted with new PVC clamps. All materials contractor supply.

i) Renewal of greasing line upto 25mm dia along with adaptors/unioin/PVC clamps

g) Gantry head tumbler blocks to be removed from position, opened up and overhauled. Pins & bushes to be renewed whereever required and fitted back. Greasing lines/passages to be cleaned, freed and made good. All spares ship supply.

i) O/H of gantry head tumbler blocks

i) Gantries steel to be cropped and renewed as per UTG report. UTG yard scope.

j) Wooden fender brackets to be renewed and existing/ new wooden block to be fitted on the chocks. Brackets material contractor supply.

GANTRIES PULLEYS:

Following pulleys/tumbler blocks are to be removed from the place after removing locking plate. Complete pulleys are to be thoroughly dismantled, inspected, cleaned and overhauled. Pins and bushes are to be removed. After inspection and overhauling, pulleys are to be fitted back with new /reconditioned pin and bushes. New locking plate to be welded (including drilling/tappling of bolt-holes/threads on tumbler block). Greasing lines/passages to be cleaned, freed and made good. Pulley to be chipped & painted with one coat of primer & paint. All spares ship supply. Primer & paint contractor supply.

a) Gantry pulley (800mm diax 85mm thick)

b) Pulley (450mm diaX50mm thick) pin dia

c) 4 sets pulleys (dia 275 mmx25mm thick) -4 Nos in each set

d) 2 set pulleys (dia275mmX75mm thick)-8 Nos in each set.

P & S SUCTION TUBE ON DECK:

a) Removing & transporting of draghead to workshop and to transport back after repairs. To refit same/reconditioned draghead with new bolts and nuts (ship supply) to suction tube. Packings (contractor supply) for jet pipe to be renewed with ship supply bolts & nuts.

b) Dismantling and removing the 700 NB suction pipes assembly (upper & lower pipes along with jet pipes), 16000mm long (approx) from position along with 2500x2500 gimble ring (cardan ring) and 2500 long/300NB & 1000mm long/300dia jet hoses, fork arms, jet pipes and suction & jet hoses etc. from the suction bend fork arm and to be kept on deck side/transported to workshop. After repairs (to various items), suction tube assembly & associated all mountings, fixtures are to be fitted to their respective original position on deck including pipe sections, suction pipe to be assembled with new/existing/reconditioned turning gland, gimble ring, fork arms, flexible rubber hoses etc. All sensors to be fitted back in respective positions & connections given fitted / welded in position.

c) Complete overhauling of gimble ring assembly (gimble ring with 2 fork arms) and housing of bushes to be built up & machined (line boring), if enlarged. Locking plates (200x100x20mm) to be removed & renewed. Pins & bushes to be renewed, if required.

i) Overhauling of gimble ring assembly

ii) Build-up

iii) Line boring of all holes of 1 Gimble ring

iv) Renewal of pins. Pins ship supply.

v) Renewal of bushes. Bushes ship supply.

vi) Renewal of locking plate (200x100x20mm). Material contractor supply.

d) Suction bend with fork arm - housing of bushes to be built up and machined, if enlarged.

e) Pins & bushes to be renewed, assemble back and locking plates to be renewed.

i) Pins. Pins ship supply.

ii) Bushes. Bushes ship supply.

f) Thinned down, wasted and corroded portion of the fork arms to be cropped and renewed as per drawing. Material contractor supply.

h) Fabrication of new suction pipe to the required length, and welding butt joint and making suction tube as per sample with existing flange out of 16 mm thick Lloyds Gr.A steel plate including new packing (contractor supply), new bolts & nuts & removal & fitment of all other fittings. Dia of pipe - 700 mm. Size of pipe renewal to be clearly mentioned in Workdone certificate. Suction pipe & flange - ship supply. Bolts & nuts yard supply.

i) Lifting hook to be cropped and renewed size 350 x 230 x 30mm (Approx.) each. Material contractor supply.

k) MS Channel for suction tube pneumatic depth indicator air pipe of approx. size 100 x 50 mm, on suction tube is to be cropped and renewed. Material contractor supply.

m) Renewal of 2" PVC saddle (heavy duty) clamps on suction tube. Material contractor supply.

TURNING GLAND (P & S):

a) Remove both the turning gland flange bolt & nuts (36 dia x 120mm - 48 Nos) shift the turning gland from ship to jetty with shore crane. Turning glands (700mm dia) to be completely dismantled. Calibration of inner pipe, outer-pipe, wearing rings, etc. to be done. 'L' rubber ring/seal to be renewed. Proper clearances as per drawings to be ensured. Rubber L-ring/seal to be renewed. Turning gland to be assembled back. Stoppers/arresters to be fitted back to respective positions as per ship staff instructions. All spares DCI supply.

b) Worn-out portion of the male collars (of inner pipe) & female groove (of outer pipe) to be built-up and machined to required dimensions as per drawing. Electrode: ESAAB - Terro weld DBL/DMS or equivalent.

SUCTION BEND TRUNION AND SUCTION BEND (P&S): 2 Nos

a) Both P & S gantries along with service frame & APRON (H-FRAME) to be dismantled and kept ashore for inspection. To be fitted back after repairs.

b) H-FRAME & A-Gantry heel pins and top pins are to be checked for wear and tear. Worn out pins to be renewed / reconditioned to original size. Hell bush housing and cover to be built up and machined to original size. Lower-half bush housing to be renewed, as required as per ship staff instructions. Locking plates to be renewed as required. All greasing lines of gantry heel bushes & H-frame to be cleaned, freed and made good. Heel pin bushes,all pins & bushes ship supply.

i) Heel pin bushes renewal

ii) Pins renewal of A-gantry & H-FRAME

iii) Bushes renewal of A-gantry & H-FRAME

c) ii) Grease lines to be renewed with adaptors/union-fittings and fitted with new PVC clamps. Cu-pipe OD 12mm approx. All materials contractor supply.

d) Suction bend gantry & A-FRAME all bushes to be renewed as per instructions. Pins & bushes ship supply.

i) Pin renewal.

ii) Bush renewal

e) Gantry head tumbler blocks to be removed from position, opened up and overhauled. Pins & bushes to be renewed wherever required and fitted back. Greasing passages to ensure clear. All spares ship supply.

f) ii) Gantry and H-FRAME steel to be cropped and renewed as per UTG report. UTG yard scope.

h) STPM service frame pin and bush to be renewed. Pins & bushes ship supply. New lock plates to be made & fitted. Lock plate material contractor supply.

i) STPM service frame and gantry wasted areas to be renewed

SUCTION BEND & SUCTION SLIDE:

a) Both port & stbd suction slides and suction bends to be taken out from position and completely dismantled & boxed back with new / reconditioned internal parts, studs & nuts (ship supply). After completion of repair of suction slide as above, all parts of the slide are to be assembled and brought back to the vessel, and with crane’s help, same to be slide/tried-out in the ship side rails for checking the alignment of the slide with the shipside mouth. Wedge of the slide to be adjusted for proper alignment & working clearances with ship's side mouth face and slide face to be checked and shown to the ship staff. All spares ship supply.

b) Wedge pieces to be renewed along with the rod and adjusting position of slide with suction mouth in docked condition. All spares ship supply.

c) Worn out areas of slides to be built up with suitable electrodes & machined including studs area, as per instructions and wearing plates to be renewed as per instructions.

i) Build up using L&T 2B or equiivalent electrode

ii) Wearing ring and wearing bushes. Studs, nuts, CSK screws to be inspected and renewed as necessary. All spares DCI supply.

d) Locking plates to be welded for all the studs as per ship staff instructions. Material contractor supply.

e) Suction Bend arm piece bush and pin to be renewed and secured with new locking plates. Pin & bush ship supply.

i) Pins

ii) Bushes

iii) Locking plates to be renewed. Material contractor supply.

f) Both port and starboard suction bends pipes (inner portion) to be applied with layer of plastic carbide putty for wear-protection as advized by SS/Superintendent, if required. Plastic carbide putty ship supply.

g) Suction bend pipe rotating gland collar retaining half ring washer to be renewed if found worn out or broken. All spares ship supply.

h) Jet Manchet (rubber) & spacer ring to be renewed. All spares ship supply.

i) P & S suction mouth liners to be renewed (Dia 700mm, Length Approx.1700mm, 16mm Thk). Material contractor supply.

j) Worn out/ thinned down portions of ship-side rails (port & stbd) to be build-up with LH (MS) electrodes and ground evenly for smooth working/ sliding of suction slide & minimum clearances

k) Both port and starboard suction mouth flat ring to be renewed, if found worn out. To be properly aligned maintaining required clearances. Approx Size : 700 ID x 1100 OD x 25 mm thick - 200 Kg. Material contractor supply.

l) Jet discharge mouth collar outside face to be build-up and machined for ensuring proper alignment and minimum clearances all around, when the suction slide in position.

HYDRAULIC WINCHES: Following winches including rope drum, hydraulic brakes and hydraulic motors to be dismantled, inspected, overhauled and assembled back with new seals, bearing, brakes etc. with painting. Complete gear boxes to be thoroughly overhauled and DP / MPI tested. Renew all bolts and nuts including foundation bolts. All hyd. lines to be connected with new washers, 'O' rings and secure with new brackets. All Hyd. unions, relief v/v, shuttle v/v, hyd. line cocks and valves are to be covered with DENSO tape for protection. All spares ship supply.

a) Draghead winch (P&S)

b) Intermediate winch (P&S)

c) Trunion winch (P&S)

d) Winch foundation thinned/wastred plates to be renewed. Material contractor supply.

APTGLOBAL MARIN EENGINEERING PVT LTD