Patent SG-11201908545Y-A (SG)
Title: Positive lock system for restrained joints of ductile iron spun pipes and fittings
Inventor: SHRIVASTAVA ANURAG
IPC: F16L17/00
Filed: 2018-03-20
Abstract: Title: POSITIVE LOCK SYSTEM FOR RESTRAINED JOINTS OF DUCTILE IRON SPUN PIPES AND FITTINGS (57) : This present invention relates to novel positive lock system for restrained joints of ductile iron spun pipes and fittings which are able to take all the thrust loads pro- duced due to transmitting fluids pressure and provide certain angular deflections to the axis of two pipes. For ductile iron pipe to be joined, a socket (bell shape) and a spigot (plain end) sections are provided in pipes. For joining plain end is inserted in bell shape end. As the water pressure surges, the joint tends to disengage due to increasing axial loads. To take these axial loads, a circumferential chamber is provided in bell shape end and plain end is provided with a weld bead of suitable size. Axial forces generated due to water pressure is transmitted to pipe socket through welding via locking segments. Locking segments are in- serted in circumferential chamber and they stays between chamber and welding bead. Cir- cumferential chamber has suitable clearances to provide the required angular deviations at the joint. W O 20 18/ 17 29 22 Al (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (43) International Publication Date 27 September 2018 (27.09.2018) WIPO I PCT omit VIII °nolo olo X11101111010111 ino ois (10) International Publication Number WO 2018/172922 Al (51) International Patent Classification: F16L 17/00 (2006.01) F16L 37/00 (2006.01) (21) International Application Number: PCT/IB2018/051843 (22) International Filing Date: 20 March 2018 (20.03.2018) (25) Filing Language: English (26) Publication Language: English (30) Priority Data: 201711009888 21 March 2017 (21.03.2017) IN (71) Applicant: JINDAL SAW LTD [IN/IN]; Jindal Centre, 12, Bhikhaji Cama Place, New Delhi 110066 (IN). (72) Inventors: SHRIVASTAVA, Anurag; Plot No. 95, Sec- tor 40, Gurgaon, Haryana (IN). RAJASEKARAN, V.; A-6 Jindal Saw Colony, Village- Samaghogha, Mundra Taluk, Kachch District, Gujarat 370415 (IN). BOSE, Partha; B -8/2 Savitri Vihar, Jindal SAW New Colony, Village-, Sa- maghogha, Mundra Taluk, Kutch District, Gujarat 370415 (IN). SUBRAMONIAN, K.; CS-OS, Old Housing Colony, Jindal Saw Limited (IPU), Samaghogha Village, Mundra Taluk, Kutch District, Gujarat 370415 (IN). (74) Agent: GARG, Vidisha et al.; Anand and Anand Advo- cates, B-41, Nizamuddin East, New Delhi 110013 (IN). (81) Designated States (unless otherwise indicated, for every kind of national protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (84) Designated States (unless otherwise indicated, for every kind of regional protection available): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG). Declarations under Rule 4.17: — of inventorship (Rule 4.17(iv)) Published: with international search report (Art. 21(3))