http://www.legislation.gov.uk/id/uksi/2001/1426/schedule/4/paragraph/wrapper74n1

SCHEDULE 4 MODULES TO BE FOLLOWED FOR CONFORMITY ASSESSMENT

The following table indicates which modules are to be followed when undertaking conformity assessment procedures.

Category of transportable pressure vessel	Modules
Vessels for which the product of the test pressure and the capacity is no more than 30 Mpay litre (300 barylitre)	A1, D1, or E1
Vessels for which the product of the test pressure and the capacity is more than 30 and no more than 150 Mpay litre (300 and 1500 bary litre respectively)	H, B in combination with E, B in combination with C1, B1 in combination with F, or B1 in combination with D
Vessels for which the product of the test pressure and the capacity exceeds 150 Mpay litre (1500 bary litre)	G, H1, B in combination with D, or B in combination with F

Category of transportable pressure vessel

Modules

Vessels for which the product of the test pressure and the capacity is no more than 30 Mpay litre (300 barylitre)

A1,

D1, or

Vessels for which the product of the test pressure and the capacity is more than 30 and no more than 150 Mpay litre (300 and 1500 bary litre respectively)

B in combination with E,

B in combination with C1,

B1 in combination with F, or

B1 in combination with D

Vessels for which the product of the test pressure and the capacity exceeds 150 Mpay litre (1500 bary litre)

H1,

B in combination with D, or

B in combination with F