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Point integrating

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  • 1. 20.005 POINT INTEGRATING Approval Date: 20 May 1998 Reviewed on : 23 October 2007 Version: 1 Equipment Specification: POINT INTEGRATING Version 1 20.005-1/4 Purpose The point integrating sediment sampler is to be used for taking suspended sediment samples at a fixed depth in rivers and canals. The instrument will be is winch operated from a bridge or a cable-way. Introduction Several streamlined, cable-suspended, point-integrating samplers are available on the market for use from a survey vessel, from a boat, from a bridge or from a cable-way. Operation of these medium- or heavy-weight samplers require special reels with depth indication. Sometimes, depth is measured directly on the cable, but this technique is not adequate because too much unreliable. The 50 kg heavy US P-61 is widely considered as a standard; it is suitable for most flow conditions. This medium-weight sampler has a cast bronze body, originally designed for use with a round, pint milk-bottle sample container. The head of the sampler is hinged to permit access to the sample container. Tail vanes align the instrument into the stream flow. A reel with a 3 mm cable is needed for safe operation. An intake nozzle extends horizontally from the nose of the sampler body. A valve mechanism enclosed in the head is electrically activated to start and stop the sampling. The valve- operating switch is located at the observer’s station on the vessel, bridge or cable-way. While sampling, the air present in the bottle escapes through a streamlined exhaust mounted on the side of the sampler head. The sampler is supported by a suspension bar attached to a 3 mm steel two-conductor electrical cable, wound on a reel, mounted on a crane. The crane’s protractor point must be high enough above vessel or bridge deck to allow an easy handling of the instrument when removing the sample bottle. The point-integration samplers may be used to take depth-integrated samples: • As for the depth-integrating samplers, if the depth is not over 5.5m with moderate flow velocity (see instructions for the US D-74). • If the stream is between 5m and 9m and/or has a high velocity, the sampler may be used to depth-integrate in one direction, i.e. from the stream bottom to the water surface. • Over part of the vertical only. The sampler is quite easy to operate and to maintain. This sampler was tested in India in the early 70’s. Conditions & Requirements • The sampler shall have a streamlined body. • No bolts or other parts, other then for taking the sample, shall protrude from the body. • The sample shall remain intact while hoisting the sampler. • The sampler shall have a well established and proven correction factor. • Spares and tools required for routine maintenance shall be part of the delivery. • The sampler shall be equipped with an exhaust in order to allow the air to escape from the sample container without disturbing the in-flowing sample. • The sampler shall be easy to handle.
  • 2. Equipment Specification: POINT INTEGRATING Version 1 20.005-2/4 • No sample shall leak from the container while hoisting and handling the instrument. • The suspension mechanism of the sampler and in particular the suspension bar shall be well designed, ensuring a perfect balance of the sampler at all stages of filling. The nozzle shall be kept horizontal and in the flow direction. • When the sampler touches the riverbed, then the nozzle shall remain horizontally and at a constant height above the riverbed. • When the sampler touches the riverbed, it shall produce little disturbance to the bed sediment. • The nozzle efficiency coefficients shall be made available. Specifications • water velocity up to 5 m/s • water depth up to 20 m • operation by winch from a boat or bridge • valve electrically operated by switch control
  • 3. 20.005 POINT INTEGRATING As per HP-I Approval Date: 20 May 1998 Version: 1 Equipment Specification: POINT INTEGRATING Version 1 20.005-3/4 Purpose The point integrating sediment sampler is to be used for taking suspended sediment samples at a fixed depth in rivers and canals. The instrument will be is winch operated from a bridge or a cable-way. Introduction Several streamlined, cable-suspended, point-integrating samplers are available on the market for use from a survey vessel, from a boat, from a bridge or from a cable-way. Operation of these medium- or heavy-weight samplers require special reels with depth indication. Sometimes, depth is measured directly on the cable, but this technique is not adequate because too much unreliable. The 50 kg heavy US P-61 is widely considered as a standard; it is suitable for most flow conditions. This medium-weight sampler has a cast bronze body, originally designed for use with a round, pint milk-bottle sample container. The head of the sampler is hinged to permit access to the sample container. Tail vanes align the instrument into the stream flow. A reel with a 3 mm cable is needed for safe operation. An intake nozzle extends horizontally from the nose of the sampler body. A valve mechanism enclosed in the head is electrically activated to start and stop the sampling. The valve- operating switch is located at the observer’s station on the vessel, bridge or cable-way. While sampling, the air present in the bottle escapes through a streamlined exhaust mounted on the side of the sampler head. The sampler is supported by a suspension bar attached to a 3 mm steel two-conductor electrical cable, wound on a reel, mounted on a crane. The crane’s protractor point must be high enough above vessel or bridge deck to allow an easy handling of the instrument when removing the sample bottle. The point-integration samplers may be used to take depth-integrated samples: • As for the depth-integrating samplers, if the depth is not over 5.5m with moderate flow velocity (see instructions for the US D-74). • If the stream is between 5m and 9m and/or has a high velocity, the sampler may be used to depth-integrate in one direction, i.e. from the stream bottom to the water surface. • Over part of the vertical only. The sampler is quite easy to operate and to maintain. This sampler was tested in India in the early 70’s. Conditions & Requirements • The sampler shall have a streamlined body. • No bolts or other parts, other then for taking the sample, shall protrude from the body. • The sample shall remain intact while hoisting the sampler. • The sampler shall have a well established and proven correction factor. • Spares and tools required for routine maintenance shall be part of the delivery. • The sampler shall be equipped with an exhaust in order to allow the air to escape from the sample container without disturbing the in-flowing sample. • The sampler shall be easy to handle. • No sample shall leak from the container while hoisting and handling the instrument.
  • 4. Equipment Specification: POINT INTEGRATING Version 1 20.005-4/4 • The suspension mechanism of the sampler and in particular the suspension bar shall be well designed, ensuring a perfect balance of the sampler at all stages of filling. The nozzle shall be kept horizontal and in the flow direction. • When the sampler touches the riverbed, then the nozzle shall remain horizontally and at a constant height above the riverbed. • When the sampler touches the riverbed, it shall produce little disturbance to the bed sediment. • The nozzle efficiency coefficients shall be made available. Specifications • water velocity up to 5 m/s • water depth up to 20 m • operation by winch from a boat or bridge • valve electrically operated by switch control

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