OPERATION AND MAINTENANCE MANUAL
01-2016
3
1 TECHNICAL DESCRIPTION
1.1 PRODUCT NAME AND FEATURES
The subject of this O&MM is:
Pipeline flushing device, with single closure TYPE 8895
- With automatic water drainage activated by medium flow stoppage;
- Stainless steel knife (closer);
- Knife's drive elements may be replaced without cutting off flow;
1.2 PURPOSE
Pipeline flushing device is intended for fire protection systems, for chemically neutral pure water, free
of impurities and for industrial systems. For cleaning pipelines and for other types of inspections.
1.3 TECHNICAL SPECIFICATION
The device is designed for transferring both potable and industrial water at temperatures from +1
°
C
to +50
°
C.
- Available diameters (dimensions)
DN80 [mm]
- Maximum medium flow rate:
- liquid up to 4 [m/s]
- driving torque at opening start and closing end are listed below:
DN [mm]
80
Mmax [Nm]
60
- equipment control: closing direction in the standard version of hydrant:
clockwise closing sense of rotation.
The closing sense of rotation can be opposite on special order.
-
connection flanges are manufactured in accordance with PN-EN 1092-2:1999
with the dimensions adequate to the relevant nominal pressure of 1.6 MPa.
-
Fittings efficiency with nominal pressure 0.2 MPa is:
10 dm
3
/s – above ground DN80
-
Key for controlling valves and taps PN-63/M-74085
-
Manufactured in accordance with PN-EN 14339:2009
2 STRUCTURE
2.1 DEVICE DESIGN DESCRIPTION
The pipeline flushing device is a column with internal structure to enable drawing water from main
pipeline for monitoring or cleaning. The lower part of the device includes a body (no. 1) with flow gate (acting as
a closing component) and a drainage device. The lower chamber's body has a connecting flange for installing the
fitting on pipeline. In the top part of the fitting's column (no. 7) there is a saddle tee (no. 8) for connecting the
fitting stand. In parallel to the fitting's column (no. 7), there is a driving unit for the shut-off gate on bonnet
(no. 2). To close or open the fitting, the housing bolt must be rotated using a T key installed on the housing
(no. 6) with cap (no. 9) which activates transmission mechanism rotating eccentric plate located in the bonnet
(no. 2). The plate has a toothed connection with closing cover to effect reciprocating movement (i.e. closing-
opening). When the rotating gate moves the knife's plate positioned in perpendicular to the water flow direction
towards sealing socket with knife's seal, the water drainage opening opens and water flows out the hydrant's
column (no. 7).
