(19)

(11)

EP 0 215 774 A1

(12)

(43) Date of publication: 01.04.1987 Bulletin 1987/14 (21) Application number: 84903190.0 (22) Date of filing: 03.09.1984

(51) International Patent Classification (IPC):  F16L 58/ 18( . ) (86) International application number: PCT/GB1984/000307 (87) International publication number: WO 1986/000384 (16.01.1986 Gazette 1986/02)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 22.06.1984 GB 19840016005 (71) Applicant: ASHBY SCOTT & COMPANY LIMITED Ascot, Berkshire SL5 7RP (GB)	(72) Inventors: WICKINS, Brian James Pinner, Middlesex HA5 1TW (GB) GROVES, Frank George Crudden Bay, Aberdeen AB4 7NW (GB)