Technology and Operations
This forum is for discussing technological & operational matters pertaining to U-boats.
Compressed Air System VII
Posted by:
Scott
()
Date: January 01, 2002 04:37PM
Starting Air System:
The starting air system consists of a line from the high pressure air manifold which leads, by way of a stop valve, a filter, a 205 to 75 atmosphere (2920 to 1066 psi) reducing valve and a relief valve to a starting air flask with a pressure gauge. The 1066 pound line to the air bottle also has a branch to each engine, which reaches the engine by way of a pressure gauge, a stop valve, the main engine starting valve, a 75 to 30 atmosphere (1066 to 427 psi) reducing valve, a second gauge and the air starting and reversing arrangements on the engine. The reducing valve are similar in principle to those described under the low pressure air system.
The starting air flask is normally kept charged to 1066 psi, act as a volume tank and supplies air which is admitted to the desired engine by opening the related main starting valve. It also serves as an emergency source of air in case air from the high pressure manifold is not available.
Starting air for the diesel compressor is supplied when a starting air flask for the main engines is installed, from a branch on the discharge line from the compressor to the high pressure air manifold, which in this case acts as a supply line to the diesel compressor, and is fitted with a stop valve, filter, a 205 to 30 atmosphere (2920 to 427 psi) reducing valve and a releif valve. Opening of the stop valve admits air to the starting mechanism of the diesel compressor.
In lieu of the arrangements desrcibed in the foregoing three paragraphs, some vessels of this type have no starting air flask for the main engines, but instead, via a regulating valve, a filter and a parallel arrangement of two 205 to 30 atmosphere reducing valves (2920 to 427 psi) with stop valves on the high and low side of each reducer, to a common line serving the main engines and the diesel compressor. In this case one reducer acts as a standby for the other, and, if the system is in opration, the opening of the starting valve to an engine or the compressor admits air to the desired unit for starting.
The starting air system consists of a line from the high pressure air manifold which leads, by way of a stop valve, a filter, a 205 to 75 atmosphere (2920 to 1066 psi) reducing valve and a relief valve to a starting air flask with a pressure gauge. The 1066 pound line to the air bottle also has a branch to each engine, which reaches the engine by way of a pressure gauge, a stop valve, the main engine starting valve, a 75 to 30 atmosphere (1066 to 427 psi) reducing valve, a second gauge and the air starting and reversing arrangements on the engine. The reducing valve are similar in principle to those described under the low pressure air system.
The starting air flask is normally kept charged to 1066 psi, act as a volume tank and supplies air which is admitted to the desired engine by opening the related main starting valve. It also serves as an emergency source of air in case air from the high pressure manifold is not available.
Starting air for the diesel compressor is supplied when a starting air flask for the main engines is installed, from a branch on the discharge line from the compressor to the high pressure air manifold, which in this case acts as a supply line to the diesel compressor, and is fitted with a stop valve, filter, a 205 to 30 atmosphere (2920 to 427 psi) reducing valve and a releif valve. Opening of the stop valve admits air to the starting mechanism of the diesel compressor.
In lieu of the arrangements desrcibed in the foregoing three paragraphs, some vessels of this type have no starting air flask for the main engines, but instead, via a regulating valve, a filter and a parallel arrangement of two 205 to 30 atmosphere reducing valves (2920 to 427 psi) with stop valves on the high and low side of each reducer, to a common line serving the main engines and the diesel compressor. In this case one reducer acts as a standby for the other, and, if the system is in opration, the opening of the starting valve to an engine or the compressor admits air to the desired unit for starting.
| Subject | Written By | Posted |
|---|---|---|
Compressed Air System VII
|
Scott | 01/01/2002 04:37PM |
|
Re: Compressed Air System VII
|
Nathan Greenfield | 01/06/2002 10:35PM |
|
Re: Compressed Air System VII
|
Scott | 01/07/2002 02:20AM |
|
Re: Compressed Air System VII
|
roark | 01/15/2002 05:00PM |