The Oil Heaters (Safety) Regulations 1977

(Regulation 14(1) and (2))

SCHEDULE 1 Standards for pressure heaters

PART I

Pressure heater fuel container pressures

1.  An internal pressure of 2.1 bar.

2.  Any internal pressure capable of being produced by operating the pump connected to the container through sixty complete strokes in one minute with the container full to the full fuel level.

3.  The lesser of the two pressures calculated in accordance with the formulae set out in Part III of this Schedule.

PART II

Pressure heater burner pressures

1.  An internal pressure of 4.2 bar.

2.  An internal pressure equal to any capable of being produced in the fuel container of the heater by operation of the pump in the manner described in Part I of this Schedule.

3.  An internal pressure equal to the lesser of the two pressures calculated, in relation to the fuel container of the heater, in accordance with the formulae set out in Part III of this Schedule.

PART III

Formulae for calculating pressures

No math image to display

No math image to display

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.

(Regulation 20)

SCHEDULE 2 Maximum surface temperatures

Column 1	Column 2
Description of part of oil heater	Maximum temperature Degrees centigrade
Any part made of metal or of a material of a thermal conductivity not lower than that of steel and not higher than that of aluminium being a part which it may be necessary to touch in order to extinguish the heater or to adjust its flame or to move it	60
Any part made of a material whose thermal conductivity is substantially lower than that of steel, being a part such as is described above	85
Any part of the surface of a portable heater, being a part which is liable to be touched by accident	120

(Regulation 24)

SCHEDULE 3 Test for draught resistance

1.  The oil heater shall be operated in accordance with the provisions of Appendix C to the British Standard Specification of 1974 in a wind tunnel constructed and operated in accordance with the provisions of Appendix J to that Specification.

2.  After the heater has been finally adjusted as specified in Appendix C to the British Standard Specification of 1974 it shall be exposed for 5 minutes to a steady frontal horizontal draught at a velocity not exceeding 8 metres per second. During this 5 minute period not more than 10 flashes of flame shall appear outside the heater, none of which shall last as long as one second or exceed 50 millimetres in length.

3.  If, in the case of a heater fitted with a short drum burner, the flame is displaced during the 5 minute period specified in paragraph 2 of this Schedule so that the flame burns at the base of the heater, the heater shall be exposed to the draught specified in that paragraph for a further 30 minutes. During this further period no flame shall appear outside the heater.

4.  After the end of the tests specified in paragraphs 2 and 3 of this Schedule the draught shall be stopped and the heater allowed to burn for 15 minutes. During this 15 minute period no flame shall appear outside the heater.

5.  If during either of the tests specified in paragraphs 2 and 3 of this Schedule the flame is extinguished the draught shall be stopped immediately. During the following 15 minutes no flame shall appear outside the heater.