# The Oil Heaters (Safety) Regulations 1977, Part III


Formulae for calculating pressures
Pressure 1 in bars = 1330 × the mechanical advantage the internal cross-sectional area of the pump in millimetres Pressure 2 in bars = 1.03 × the compression ratio of the pump.
In this Part of this Schedule “the mechanical advantage” means the factor by which the force applied to the pump handle is multiplied between the point at which the force is applied and the pump piston.

---
Source: https://www.legislation.gov.uk/uksi/1977/167/schedule/1/part/III (the official version)
Page: https://openlegislation.uk/oil-heaters-safety-regulations-1977/schedule-1/part-III
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.