Valmet Flowrox Expulse Series, Installation, Operation And Maintenance Instructions

4EXP70EN - 9/2023

10

5.2  Flow direction and support 

Do not step on a dampener installed in horizontal or 

angled position.

The dampener does not have an intended flow direction; 

therefore it can be freely installed to the pipeline.

The pipeline needs to be supported before and after the 

dampener.

Figure 5.  Pipeline supports in horizontal installation.

Figure 6.  Pipeline supports in angled installation.

5.3  Dampener installation

At least the following must be ensured before Expulse 

dampener installation:

•  The pipeline is isolated from the process and there is no 

pressure in it.

•  The pipeline is empty, clean, and cooled down.
•  The pipeline connectors are with proper distance to 

enable installation of dampener.

•  The connector size is correct.
•  The pump is locked in OFF position.
•  The dampener is not pressurised.

1.  Lift the dampener on place with appropriate lifting 

equipment.

2.  Apply pipe tape or hemp on the connector threads.
3.  Tighten the connectors between the dampener and 

pipeline.

Figure 7.  Maximum dimension between the pipeline 

center axes.

Dim X = 1 x DN size, for example for DN65 dampener 

dimension X is 65mm (2.56 in).

Figure 8.  Maximum angle between the pipeline center 

axes.

Dim Y = 10º

6  Operation

6.1  Commissioning and decommissioning

Before the dampener is operated within the pipeline, ensure 

that it has been installed in accordance with this manual and 

applicable safety regulations. 

The following must also be ensured:
•  Parameters on the type plate are suitable for the process 

and environment

•  The dampener is used for the purpose specified at the 

time of sales

1.  Turn on the pump and drive it at the design pressure. 
2.  Slowly pressurise the dampener through the valve (part 

7). Use compressed air with no oil. The maximum filling 

air pressure is 6 bar (0,6 MPa).

3.  Observe the effects and add more pressure until the 

wanted dampening effect is reached. Normally the 

needed pressure is 25-40% from the pipeline pressure.