AN ANNULUS REFERENCE TRAP SYSTEM USED IN DRILL STEM TESTING. THE SYSTEM IS USED TO TRAP A PRESSURE IN THE REFERENCE SECTION OF THE PRESSURE OPERATED TESTER VALVE. THE PRESSURE OPERATED TESTER VALVE CAN THEN BE OPERATED THROUGH APPLICATION AND REMOVAL OF APPLIED ANNULUS PRESSURE. THE SYSTEM FUNCTIONS AS A CHECK (NON RETURN) VALVE. IT HAS A SAFETY FEATURE IN-BUILT WHERE THE CHECK NON RETURN FEATURE CAN HOLD A GIVEN AMOUNT OF PRESSURE BEFORE IT STARTS LEAKING OFF PRESSURE. THIS MEANS THAT THE TOOL IS BACK AT ORIGINALLY STORED PRESSURE ENERGY WHEN IT IS BACK AT THE SURFACE, MAKING IT SAFER TO HANDLE ON THE DRILL FLOOR. THE MAIN COMPONENTS ARE MADE OF CARBON STEEL, SOME PARTS ARE MADE OF STAINLESS STEEL. TOOL WEIGHT: 133 KG. OD: 127MM.

CLASSIFICATION HAS BEEN DETERMINED IN ACCORDANCE WITH THE FOLLOWING:- GENERAL INTERPRETATIVE RULES (GIR)S GIR 1 HAS BEEN USED TO CLASSIFY THIS PRODUCT BY THE TERMS OF HEADING 8481 FOR TAPS, COCKS, VALVES AND SIMILAR APPLIANCES FOR PIPES, BOILER SHELLS, TANKS, VATS OR THE LIKE, INCLUDING PRESSURE-REDUCING VALVES AND THERMOSTATICALLY CONTROLLED VALVES GIR 6 HAS BEEN USED TO CLASSIFY THE GOODS TO SUBHEADING LEVEL 8481 30 FOR CHECK (NON-RETURN) VALVES CN CODE 848130 91 FOR OF CAST IRON OR STEEL TARIC 84813091 99 FOR OTHER THAN ELSEWHERE SPECIFIED IN THIS SUBHEADING ALSO CLASSIFIED IN ACCORDANCE WITH:- HARMONISED SYSTEM EXPLANATORY NOTES (HSEN) (3) TO HEADING 8481