Title of Invention | A METHOD OF CERAMIC COATING ON STEEL SECTIONS |
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Abstract | This invention relates to a method of coating of refractories on the inside and outside surface of a steel pipe comprising the steps of : Dimensional checking, Surface Preparation, Coating Preparation, Coating 1, Curing 1, Coating 2, Curing 2, Thread Cleaning, Coupling and Inspection of the pipes randomly for their thickness of the coating using a thickness gauge. |
Full Text | FORM 2 THE PATENTS ACT, 1970 (39 of 1970) PROVISIONAL SPECIFICATION (Section 10) A METHOD OF CERAMIC COATING ON STEEL SECTIONS AND THERE OF THE PRODUCT SUNIL SHANTISARUP GUPTA FLAT NO-1,3rd FLOOR,MITRA KUNJ 16, PEODER ROAD, MUMBAI-400026 MAHARASTRA, INDIA INDIAN THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE NATURE OF THE INVENTION This invention relates to a method of ceramic coating on steel sections, the product manufactured by this method, particularly steel pipe. The process involves the coating of refractories on the inside and outside surface of a pipe using a specially manufactured machine. The process is as under: 1 .Dimensional Checking: The range of pipes is ΒΌ " NB to 3" NB . The black pipes are purchased from a pipe manufacturer. They are checked for physical dimensions as per standards. The length is then cut to size. Both ends are threaded as per BSP standards. 2.Surface Preparation; The pipes are degreased in a degreasing tank filled with a degreasing solution. They are water rinsed thereafter. The pipes are then pickled in a light acid tank. After pickling they are water washed twice. They are then transferred to hot phosphating tank at 70 deg. C. This is followed by water rinse and drying in air. These surface prepared pipes are then transferred to the coating section. 3.Coating Preparation: Refractories like Calcined Bauxite, Ball Clay, Fire Clay, Bentonite, Green Chrome Oxide and Sodium Alginate are dry sieved and mixed, for the first coat. Refractories like Calcined Bauxite, Ball Clay, Fire Clay, Bentonite, Chrome Ore and Sodium Alginate are dry sieved and mixed, for the second coat. The dry mix is then transferred to the wet mixer. Here sodium silicate binder is added and thoroughly mixed to a stiff paste consistency. 2 4.Coating 1: A specially designed machine is used for the coating operations. The inside and outside coating heads are made ready by fixing the new rubber coating rings. The prepared wet coating mix is transferred to the outside and inside coating cylinders on the coating machine and the hydraulic ram lowered on the mix. Two surface prepared pipes are placed on the coating machine and pushed into the coating stations/ heads. The pipe ends are clamped with special threaded clamps. The hydraulic pump is started. As soon as the Hydraulic Ram starts descending into the refractory filled cylinder, the pipe retracting motor is started. As the pipe starts reversing out of the coating heads, the outside coating and the inside coating is done by their respective heads. The coating thickness and uniformity is achieved by adjusting the speed of the hydraulic ram and the withdrawal speed of the pipe. After the coating the pipes are lifted manually onto the air drying table. 5.Curing 1: The coated pipes are transferred to the trolley stands and arranged in the arms of the trolley so that each coated pipe does not touch any other pipe. The loaded trolley is pushed into the drying oven. The oven is locked and the hot air blower is switched on. The hot air is circulated within the oven at a temperature of 130 Deg C for 2 hours. Intermediate exhausting is done to exhale the moisture laden air. After 2 hours the drier is switched off and the trolley is removed. The pipes are unloaded from the trolley and the second trolley is pushed into the drier for the curing process. The first batch of cured pipes are taken back to the coating machine for the second outer coating over the first coating. 6.Coating 2: The second coating is done in the same way as the first coating. The difference being that this time the refractory mix is different as mentioned above and the coating is done only on the outside. Rest of the process is the same as in the case of the first coating. 7.Curing 2: The second curing is exactly the same as the first curing. After that there is thread cleaning 3 8.Thread Cleaning: After cooling of the pipes, the pipes are visually checked for any peeling of the coating. They are then taken to the thread cleaning stand. This consists of a wire brush mounted motor running at motor speed. The pipe threads are cleaned with this wire brush. Two motors are mounted at two ends of the stand, one each for both the ends. A drip of water is used to help in the faster and smoother cleaning of the threads. 9.Coupling: The coupling is non standard. As the pipes are thin in their wall thickness the threads are kept straight and the depth of the threads is less than standard. Standard couplings are suitably modified to give a hand tight joint. After thread cleaning the prepared couplings are screwed on to the pipe. 10.Inspection: The pipes are randomly checked for their thickness of the coating using a thickness gauge. The outside coating is in the range 0.8 to 0.95mm and the inside coating is in the range 0.5 to 0.65 mm. Any coating defects are removed with manual touch up. ll.Packing; Packing is done in bundles of approximately 50 to 75 Kgs each in HDPE Bags. 12.Other Sections: Similarly other steel sections are coated. Solid sections are coated only on the outside. Hollow sections can be coated on the inside or outside or both the sides. DATED THIS 12th DAY OCTOBER 2006 SUNIL SHANTISARUP GUPTA ( SIGNATURE OF APPLICANT) 4 |
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1701-MUM-2006-ABSTRACT(26-5-2009).pdf
1701-MUM-2006-ABSTRACT(9-4-2007).pdf
1701-MUM-2006-ABSTRACT(COMPLETE)-(16-10-2006).pdf
1701-mum-2006-abstract(complete)-(17-10-2006).pdf
1701-mum-2006-abstract(granted)-(21-4-2011).pdf
1701-MUM-2006-CANCELLED PAGES(26-5-2009).pdf
1701-MUM-2006-CLAIMS(26-5-2009).pdf
1701-MUM-2006-CLAIMS(9-4-2007).pdf
1701-MUM-2006-CLAIMS(AMENDED)-(10-2-2011).pdf
1701-MUM-2006-CLAIMS(AMENDED)-(14-3-2011).pdf
1701-MUM-2006-CLAIMS(COMPLETE)-(16-10-2006).pdf
1701-mum-2006-claims(complete)-(17-10-2006).pdf
1701-mum-2006-claims(granted)-(21-4-2011).pdf
1701-MUM-2006-CORRESPONDENCE(10-2-2011).pdf
1701-MUM-2006-CORRESPONDENCE(14-3-2011).pdf
1701-MUM-2006-CORRESPONDENCE(26-5-2009).pdf
1701-mum-2006-correspondence(9-4-2007).pdf
1701-mum-2006-correspondence(ipo)-(25-4-2011).pdf
1701-mum-2006-correspondence(ipo)-(27-5-2009).pdf
1701-mum-2006-description (provisional).pdf
1701-MUM-2006-DESCRIPTION(COMPLETE)-(16-10-2006).pdf
1701-mum-2006-description(complete)-(17-10-2006).pdf
1701-MUM-2006-DESCRIPTION(COMPLETE)-(26-5-2009).pdf
1701-MUM-2006-DESCRIPTION(COMPLETE)-(9-4-2007).pdf
1701-mum-2006-description(granted)-(21-4-2011).pdf
1701-MUM-2006-DESCRIPTION(PROVISIONAL)-(16-10-2006).pdf
1701-MUM-2006-FORM 1(26-5-2009).pdf
1701-MUM-2006-FORM 18(9-4-2007).pdf
1701-mum-2006-form 2(26-5-2009).pdf
1701-mum-2006-form 2(complete)-(17-10-2006).pdf
1701-MUM-2006-FORM 2(COMPLETE)-(9-4-2007).pdf
1701-mum-2006-form 2(granted)-(21-4-2011).pdf
1701-MUM-2006-FORM 2(PROVISIONAL)-(16-10-2006).pdf
1701-MUM-2006-FORM 2(TITLE PAGE)-(26-5-2009).pdf
1701-mum-2006-form 2(title page)-(complete)-(16-10-2006).pdf
1701-MUM-2006-FORM 2(TITLE PAGE)-(COMPLETE)-(9-4-2007).pdf
1701-mum-2006-form 2(title page)-(granted)-(21-4-2011).pdf
1701-MUM-2006-FORM 2(TITLE PAGE)-(PROVISIONAL)-(16-10-2006).pdf
1701-MUM-2006-FORM 26(10-2-2011).pdf
1701-MUM-2006-FORM 3(26-5-2009).pdf
1701-mum-2006-form 5(16-10-2006).pdf
1701-MUM-2006-FORM 9(9-4-2007).pdf
Patent Number | 247573 | ||||||||
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Indian Patent Application Number | 1701/MUM/2006 | ||||||||
PG Journal Number | 17/2011 | ||||||||
Publication Date | 29-Apr-2011 | ||||||||
Grant Date | 21-Apr-2011 | ||||||||
Date of Filing | 16-Oct-2006 | ||||||||
Name of Patentee | SUNIL SHANTISARUP GUPTA | ||||||||
Applicant Address | FLAT NO-1, 3RD FLOOR, MITRA KUNJ 16, PEDDER ROAD, MUMBAI-400026, | ||||||||
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PCT International Classification Number | C23D5/00 | ||||||||
PCT International Application Number | N/A | ||||||||
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