(19)
(11) EP 0 507 619 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
06.10.1993 Bulletin 1993/40

(43) Date of publication A2:
07.10.1992 Bulletin 1992/41

(21) Application number: 92302981.3

(22) Date of filing: 03.04.1992
(51) International Patent Classification (IPC)5: C21D 9/08
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB GR IT LI LU MC NL PT SE

(30) Priority: 03.04.1991 GB 9106924

(71) Applicant: Tubular Industries Scotland Limited
Airdrie, Lanarkshire ML6 9BL (GB)

(72) Inventors:
  • Findlay, Stuart Ian
    Lanarkshire ML9 2MG, Scotland (GB)
  • McKelvie, John
    Lanarkshire ML4 2AR, Scotland (GB)

(74) Representative: Heath, Peter William Murray et al
FRY HEATH & SPENCE The Old College 53 High Street
Horley Surrey RH6 7BN
Horley Surrey RH6 7BN (GB)


(56) References cited: : 
   
       


    (54) Hardening pipes


    (57) A method of and apparatus for hardening a heated pipe by applying a quenching liquid to the interior surface of the pipe through a tubular lance in line therewith and over which the pipe is moved, the lance having a terminal guide member generally matching the section of, but spaced from, the said interior surfac, in which the liquid is propelled through a series of jets passing through the wall of the lance at positions along the lance and being directed away from the terminal guide member, the angle of the jets progressively being more acute to the wall of the lance in the direction of movement of the pipe the further the jets are disposed from the guide members whereby to promote the entrainment of the atmosphere through the space between the guide member and the said interior surface such as to enhance the unidirectionality and uniformity in the flow of water in the said direction.






    Search report