LH & LH-W (Tandem Operation)
LH & LH-W Tandem Operation Series
“Tandem operation” is an operation method that connects two pumps of the same model in series. This provides double pump head at the same flow rate in comparison with that of a single pump. The principle of tandem operation is the same as that with multistage pumps. The LH and LH-W series pumps adopt the center flange construction to align the discharge pipe with the cylindrical pump center axis.* Connecting the pumps in series with the tandem connector can provide higher pump head without affecting the advantage of the slim design. At construction sites, there are many cases where a higher pump head is required as construction work progresses.
In such cases, the addition of a tandem pump may meet the required pump head, instead of using a new pump.
* Available as an option for separately purchased LH33.0 and LH23.0W.
| Discharge Bore(mm) | 50 – 100 |
|---|---|
| Motor Output(kW) | 3 – 30 |
Note:
1. Not all the pumps listed in the catalogue are available for Australia. Models for Australia are listed below under ‘Models’
2. Product guides / catalogues may vary for Australia. Contact us for the latest technical data
The intermediate connection pipe is not required in the range indicated as a bold line on curves.
If the required total head exceeds the maximum head of the pump without an intermediate connection pipe (indicated as dashed line), an intermediate connection pipe of a length corresponding to the excess amount or more is required.
| Discharge Bore (mm) | Model | Motor Output (kW) | Phase | Starting Method | Max. Head in Tandem (m) | Max. Head w/o Intermediate Connection Pipe (m) |
|---|---|---|---|---|---|---|
| 80 | LH33.0 | 3 | Three | D.O.L. | 36 / 44 | 33 |
| 50 | LH23.0W | 3 | Three | D.O.L. | 78 / 86 | 50 |
| 50 | LH25.5W | 5.5 | Three | D.O.L. | 130 | 97.5 |
| 80 | LH311W | 11 | Three | D.O.L. | 162 | 121.5 |
| 80 | LH322W | 22 | Three | D.O.L. | 204 / 216 | 162 |
| 100 | LH430W | 30 | Three | Star-Delta | 246 / 254 | 190.5 |