Set Of Plate Weirs, Four Types
Product Code : EL-EFFCA-11068
Quick answer: The set of plate weirs, four types, gives the Lab Exports experimental flume a rectangular weir with optional aeration plus Thomson (triangular), Cipoletti (trapezoidal) and Rehbock (rectangular) sharp-crested weirs. All share one weir height, so students can compare head-discharge curves and discharge coefficients directly. Lab Exports manufactures it in Delhi for engineering colleges, polytechnics and TVET institutes.
Specifications
| Item | Specification |
|---|---|
| Weirs included | Rectangular weir (with optional aeration), Thomson weir, Cipoletti weir, Rehbock weir |
| Thomson weir | Triangular opening |
| Cipoletti weir | Trapezoidal opening |
| Rehbock weir | Rectangular opening |
| Weir plates | Stainless steel |
| Holder and rectangular weir | PVC, with lateral sealing lips |
| Rectangular weir (L x W x H) | 150 x 86 x 270 mm |
| Weir height | Identical for all four weirs |
How the weir comparison experiment is done
A sharp-crested weir turns a depth reading into a flow rate. For a rectangular notch Q = (2/3) Cd b sqrt(2g) H^1.5; for a triangular (Thomson) notch of angle theta, Q = (8/15) Cd tan(theta/2) sqrt(2g) H^2.5, which gives better resolution at low flows. The trapezoidal Cipoletti notch has sloping sides that offset the end contractions, so its discharge stays close to that of an uncontracted rectangular weir.
Because all four weirs have the same height, the approach conditions in the flume stay the same when a plate is swapped, and differences in the results come from the notch geometry alone. The aeration option on the rectangular weir shows why the space under the nappe must be vented for the standard equations to hold.
- Fit the holder in the flume and insert the first weir plate.
- Set a steady discharge and read it on the rotameter.
- Measure the head H over the crest or notch vertex upstream of the weir.
- Repeat at several discharges, then change to the next plate.
- Plot log Q against log H for each weir and work out Cd.
Key features
- Four sharp-crested geometries in one set: rectangular, triangular, trapezoidal and Rehbock
- Same weir height on every plate for a fair side-by-side comparison
- Stainless steel weir plates held in a common PVC holder
- Lateral sealing lips keep all the flow passing over the weir
- Optional aeration on the rectangular weir to study ventilated and unventilated nappes
Documentation and supply
Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the set of plate weirs at its works in Laxmi Nagar, Delhi, and supplies it to engineering colleges, polytechnics and TVET institutes in India and 60+ countries, handling the export documents for each shipment. More about the company is on the About Lab Exports page.
Related Experimental Flume Flow Channel Apparatus products
- Extension Element of the Experimental Flume (EL-EFFCA-11069)
- Venturi Flume (EL-EFFCA-11066)
- Broad Crested Weir (EL-EFFCA-11070)
- Ogee-Crested Weir with Pressure Measurement (EL-EFFCA-11065)
- Pitot Static Tube (EL-EFFCA-11071)
- Velocity Meter (EL-EFFCA-11072)
The full range is in the Experimental Flume Flow Channel Apparatus section of the Engineering Lab range.
Frequently asked questions
Which weirs are in the set?
A rectangular weir with optional aeration, a Thomson weir with a triangular opening, a Cipoletti weir with a trapezoidal opening and a Rehbock weir with a rectangular opening.
Why is a Thomson weir used for small flows?
Its V-shaped opening narrows towards the vertex, so the head changes more for a given change in flow, which makes low discharges easier to read.
Why do the weirs have the same height?
Equal height keeps the approach flow the same for every plate, so the discharge coefficients of the different shapes can be compared directly.
What is the price of the set of plate weirs?
Prices are not published on the website. Add the set of plate weirs to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code EL-EFFCA-11068 and the quantity, to receive a quotation.
Does Lab Exports manufacture the set of plate weirs?
Yes. Lab Exports manufactures the set of plate weirs at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code EL-EFFCA-11068.
Request a quote
Email [email protected] with the house code EL-EFFCA-11068 and the quantity, or add the set of plate weirs to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
