Verifying the quality of the gate valve installation
Once the mounting flange, gate valve and transducer dock have been installed, a quality inspection must take place. The inspection shall verify that the units has been installed correctly, and that the hull unit can be mounted on top of the transducer dock.
Prerequisites
Neither tools nor instruments are required.
Context
The mounting flange must be mounted so that its top mating surface is in parallel with the sea surface during normal operating conditions. The transducer dock on top of the gate valve must remain vertical during the same conditions.
The top mating surface of the transducer dock must be protected with a wooden cover at all times until the hull unit is installed. It is very important that this surface is clean and undamaged, because it must be watertight after the hull unit has been installed.
Objects protruding from the hull will generate turbulence and flow noise. This will reduce the CS90 performance. Protruding objects may be zinc anodes, transducers or even the vessel's keel. Holes and pipe outlets are also important noise sources, as well as rough surfaces caused by bad welding. Even traces of sealing compound, sharp edges, bolts or empty bolt holes will create noise.
The following requirements must be met:
•  All measurements are made and the results are written down.
•  The top of the transducer dock is in parallel with the water line.
•  The top mating surface on the transducer dock is clean without sand, dust or any other destructive particles. Is is even and smooth without scratches, dents or other physical damage.
•  The gasket or O-ring on the top of the transducer dock is not damaged.
•  The installation of the gate valve has left enough space to access end switches and (if relevant) hydraulic connections.
•  If relevant, the hydraulic system has been installed as specified in the relevant documentation.
•  The hull plating surrounding the mounting flange is even and smooth without protruding objects that can cause noise.
•  All necessary preparations have been made to design and install sufficient support brackets.
Procedure
1 Write down the key measurements.
This is for future reference.
2 Do a close visual inspection of the mounting flange, gate valve and transducer dock, and inspect the way they have been installed.
Check the upper surface of the transducer dock to ensure that it is level, undamaged and clean.
Refer to the applicable requirements.
3 Do a close visual inspection of the blister and the hull plating close to the mounting flange.
Check for any kind of objects that may cause noise.
4 Fill in the result tables.
Result
Horizontal distance from the keel to the centre of the installation trunk Height from the bottom of keel to the top of the installation trunk Height of transducer dock
 

   
Requirements Results
All measurements are made and the results are written down.  
The top of the transducer dock is in parallel with the water line.  
The top mating surface on the transducer dock is clean without sand, dust or any other destructive particles. Is is even and smooth without scratches, dents or other physical damage.  
The gasket or O-ring on the top of the transducer dock is not damaged.  
The installation of the gate valve has left enough space to access end switches and (if relevant) hydraulic connections.  
If relevant, the hydraulic system has been installed as specified in the relevant documentation.  
The hull plating surrounding the mounting flange is even and smooth without protruding objects that can cause noise.  
All necessary preparations have been made to design and install sufficient support brackets.  
Date and signature:
Further requirements
If the inspection reveals errors, inaccuracies or unfortunate dispositions related to units, devices or cables, use the Installation remarks form to document these. If necessary, write a full report, and attach high resolution photos.