Hong Kong Regulations

AIR POLLUTION CONTROL (PETROL FILLING STATIONS) (VAPOUR RECOVERY) REGULATION - SCHEDULE 2

TEST REQUIREMENTS FOR VAPOUR RECOVERY SYSTEM OF PETROL FILLING STATION

(Past version on 01/04/1999).

[sections 8 & 8A]

PART 1

VAPOUR TIGHTNESS TEST FOR VAPOUR RECOVERY SYSTEM OF PETROL FILLING STATION

1. General

1.1 This procedure applies to the determination of the vapour tightness of the
vapour recovery system of a petrol filling station. 1.2 In this Part,
"pressure/vacuum valve" (調壓排氣閥) means a dual purpose valve which
allows relatively small pressure increases or decreases to occur within a
petrol storage tank or pipe to which it is connected without allowing vapour
venting to the atmosphere or air in-breathing into the tank or pipe.

2. Determination of compliance

2.1 The outlet of any vent pipe serving the vapour recovery system of a
petrol filling station shall be fitted with a pressure/vacuum valve with the
following pressure settings-

   (a)  positive pressure within the range from 0.872 kPa (88.9 mm water
        column, gauge) to 0.622 kPa (63.5 mm water column, gauge); and

   (b)  negative pressure within the range from -2.49 kPa (254.0 mm water
        column, gauge) to -1.49 kPa (152.4 mm water column, gauge). 2.2 The
        vapour tightness of the vapour recovery system of a petrol 
        filling station shall be tested in accordance with the Vapour Recovery
        Test Procedure TP-201.3—Determination of 2 Inch WC Static Pressure
        Performance of Vapour Recovery Systems of Dispensing Facilities
        ("TP-201.3 Procedure") adopted on 12 April 1996 and amended on 17
        March 1999 by the Air Resources Board of the California Environmental
        Protection Agency. 2.3 The final five-minute pressure performance of
        the vapour  recovery system shall not be lower than the minimum
        allowable final pressure set out in Table 1B of the TP-201.3
        Procedure.

PART 2

AIR TO LIQUID VOLUME RATIO TEST FOR VAPOUR RECOVERY SYSTEM OF PETROL FILLING
STATION

1. General

This procedure applies to the quantification of the air to liquid volume ratio
of the petrol pump nozzle of the vapour recovery system of a petrol 
filling station.

2. Determination of compliance

2.1 The air to liquid volume ratio of the petrol pump nozzle of the
vapour recovery system shall be tested in accordance with the Vapour Recovery
Test Procedure TP-201.5—Air to Liquid Volume Ratio Test adopted on 12 April
1996 and amended on 1 February 2001 by the Air Resources Board of the
California Environmental Protection Agency. 2.2 The air to liquid volume ratio
shall be within the range of 0.8 to 1.2. (Schedule 2 replaced L.N. 218 of
2004) "pressure/vacuum valve" (調壓排氣閥)