Grundfos iGRID P-Zone, Installation And Operating Instructions Manual, Page: 8 / 80

English (GB)
8
3.2.2 Avoiding tension in pipe connections
The pipe sections between the isolating valves must not be
removed due to tension in the pipes. See pos. 2 in fig.
7 .
Fig. 7 Avoiding tension in pipe connections to the pit
Compact the backfill around the pit up to the lower part of a pipe
connection before connecting the pipes.
Before connecting the pipes, check the following:
• The pipes must be clean and protected with plastic plugs.
• The inlet pipes must be properly aligned in relation to the pipe
connections.
3.2.3 Backfill
Fig. 8 Even pressure on all sides of the pit
Observe the following conditions when you carry out the backfill:
• The backfill must meet the same requirements as those for the
bedding layer. See section 3.1.2 Bedding layer .
• The backfill must provide sufficient support of the pit on all
sides and ensure that the load can be transferred without
detrimental point impacts or similar impacts.
Fig. 9 Even pressure on all sides of the pit
• The backfilling must be carried out so that the pit is not
damaged or deformed.
TM
07
52
1
2
35
19
Pos. Description
1 Existing return pipe
2 Existing supply pipe without flow
3 New supply pipe, low temperature
4 New supply pipe, high temperature
5 T-Zone
The connection of district heating pipes must be
carried out by trained persons. The connection must
be done according to local technical regulations from
the local utility company and according to regulations
from the supplier of the district heating pipes.
4 5
3 2 1
WARNING
Risk of collaps
Death or serious personal injury
- Ensure the specified size of gravel is used for the
backfill.
The plate compactor must not have mechanical
contact with the pit and the connected pipes.
Use either a plate compactor or earth rammer when
working in proximity to the pit.
T
M
06
3
6
0
2
06
15
TM
0
6
3
60
3 0
615
Use mechanical compacting equipment and compact
the backfill to minimum proctor density = 97 %.
1
Max.
25 kN
Max.
150 kg
1a
2