http://www.legislation.gov.uk/uksi/2001/1426/schedule/7/paragraph/wrapper90n1The Transportable Pressure Vessels Regulations 2001texttext/xmlenStatute Law Database2020-01-20HEALTH AND SAFETY2001-07-01The Transportable Pressure Vessels Regulations 2001RegulationsThe Carriage of Dangerous Goods and Use of Transportable Pressure Equipment Regulations 2004Sch. 14reg. 1SCHEDULE 7 CONFORMITY MARKINGThis minimum dimension may be waived for small vessels.