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Interspiro DCSC
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Interspiro DCSC
The Interspiro DCSC is a semi-closed circuit nitrox rebreather manufactured by Interspiro of Sweden for military applications. Interspiro was formerly a division of AGA and has been manufacturing self-contained breathing apparatus for diving, firefighting and rescue applications since the 1950s.
The first Interspiro rebreather was the ACSC - the alternating closed and semi-closed circuit rebreather which was developed and marketed in the 1980s. In the 1990s this design was developed further to become the DCSC, also intended for mine countermeasures.
Gas supply is carried in a 5l 200bar aluminium cylinder mounted horizontally at the bottom of the unit with the valve to the diver's left. The reserve valve and bypass valve are also on the left.
The fairing case holding the components is clipped to the tubular harness frame and can be released by pulling a knob on the lower right.
The scrubber is a radial flow cylindrical design, with inward flow. It carries a 2.5 kg charge of absorbent.
The counterlung is a wedge shaped bellows, hinged on the lower edge, and the angle between the top and bottom covers is proportional to the internal volume. The change in top plate angle, as the diver breathes, controls the gas addition mechanism.
The top plate of the bellows is ballasted, so that the lifting force of the air inside is balanced by the weights: when the diver is trimmed horizontally, face down, the weights create a slight positive pressure relative to ambient. This compensates for the depth difference between the counterlung and the diver's lungs, reducing the effort required to breathe. When the diver is upright the effect of the weights is cancelled as the weight is carried by the hinge, and when the diver is horizontal, face up, the weight causes a slight negative pressure in the bellows, which compensates for the increased hydrostatic pressure on the counterlung compared with the lungs.
The dump valve for the loop and also functions as a drain for water. The counterlung is in the exhalation side of the loop. Water from condensate and leakage is trapped in the bellows before it can reach the scrubber, and can be discharged through the exhaust valve for the loop, which is mounted on the lower plate of the bellows.
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Interspiro DCSC
The Interspiro DCSC is a semi-closed circuit nitrox rebreather manufactured by Interspiro of Sweden for military applications. Interspiro was formerly a division of AGA and has been manufacturing self-contained breathing apparatus for diving, firefighting and rescue applications since the 1950s.
The first Interspiro rebreather was the ACSC - the alternating closed and semi-closed circuit rebreather which was developed and marketed in the 1980s. In the 1990s this design was developed further to become the DCSC, also intended for mine countermeasures.
Gas supply is carried in a 5l 200bar aluminium cylinder mounted horizontally at the bottom of the unit with the valve to the diver's left. The reserve valve and bypass valve are also on the left.
The fairing case holding the components is clipped to the tubular harness frame and can be released by pulling a knob on the lower right.
The scrubber is a radial flow cylindrical design, with inward flow. It carries a 2.5 kg charge of absorbent.
The counterlung is a wedge shaped bellows, hinged on the lower edge, and the angle between the top and bottom covers is proportional to the internal volume. The change in top plate angle, as the diver breathes, controls the gas addition mechanism.
The top plate of the bellows is ballasted, so that the lifting force of the air inside is balanced by the weights: when the diver is trimmed horizontally, face down, the weights create a slight positive pressure relative to ambient. This compensates for the depth difference between the counterlung and the diver's lungs, reducing the effort required to breathe. When the diver is upright the effect of the weights is cancelled as the weight is carried by the hinge, and when the diver is horizontal, face up, the weight causes a slight negative pressure in the bellows, which compensates for the increased hydrostatic pressure on the counterlung compared with the lungs.
The dump valve for the loop and also functions as a drain for water. The counterlung is in the exhalation side of the loop. Water from condensate and leakage is trapped in the bellows before it can reach the scrubber, and can be discharged through the exhaust valve for the loop, which is mounted on the lower plate of the bellows.
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