This is another take on using the mini low pressure blower pump as an air compressor.
In Mr. Merriman's SAS/MSD air at atmospheric pressure inside the dry space is used to partially/fully blow the ballast tank surfacing the boat. Negative pressure inside the SD is then relieved through the snorkel when the sail is clear.
Would it be possible to pressurized the air inside the dry space and use it to blow the ballast tank? I'm not talking of very high pressure here. To displace water out of the ballast tank at depth of 1 meter just takes about 16 psi (1 atm) of air pressure. Just above the limit of little air pump employed as a LPB.
Pre-deployment, the dry space is pressurized to about 15 psi by the air compressor ( LPB pump). Diving is done through the usual vent valve. To surface, the boat is brought up to a depth of 1 m. Air ( now pressurized) inside the the dry space (using a servo operated valve in the bulkhead) blows the ballast tank clear. At the surface the air compressor is run to repressurize the dry space ready for the next dive.
Question is, can the SD bulkheads seals handle the increase in internal pressure? Will they pop out? I'm sure this won't be a problem with other wtc that use bolts to hold the endcaps firmly in place but I've seen wtc with water pumps/ bags ballast system that use traditional o-ring sealed bulkheads with no problems.
In Mr. Merriman's SAS/MSD air at atmospheric pressure inside the dry space is used to partially/fully blow the ballast tank surfacing the boat. Negative pressure inside the SD is then relieved through the snorkel when the sail is clear.
Would it be possible to pressurized the air inside the dry space and use it to blow the ballast tank? I'm not talking of very high pressure here. To displace water out of the ballast tank at depth of 1 meter just takes about 16 psi (1 atm) of air pressure. Just above the limit of little air pump employed as a LPB.
Pre-deployment, the dry space is pressurized to about 15 psi by the air compressor ( LPB pump). Diving is done through the usual vent valve. To surface, the boat is brought up to a depth of 1 m. Air ( now pressurized) inside the the dry space (using a servo operated valve in the bulkhead) blows the ballast tank clear. At the surface the air compressor is run to repressurize the dry space ready for the next dive.
Question is, can the SD bulkheads seals handle the increase in internal pressure? Will they pop out? I'm sure this won't be a problem with other wtc that use bolts to hold the endcaps firmly in place but I've seen wtc with water pumps/ bags ballast system that use traditional o-ring sealed bulkheads with no problems.
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