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Questions about VAG Hydrants
Choose a question:
How high is a hydrant's flow rate ... when the inlet pressure is x bar?
Can the hydrant claw on the UH DN 100 be reduced to the more frequently used claw on the UH DN 80?
How is a hydrant connected to a service pipeline?
What kind of maintenance do hydrants require?
A list of spare parts for hydrants ....?
How high is a hydrant's flow rate ... when the inlet pressure is x bar?
This question cannot be answered because it does not provide enough information. The question cannot be answered based on the inlet pressure alone. The flow rate adjusts itself according to the hydrant's differential pressure.
The dependence between differential pressure and flow rate output is measured and characterised by the Kv value. The Kv value can be used as the flow rate output's reference value because the supply system's dynamic output has to be at least high enough to achieve this value (at ?p = 1 bar).
The actual flow rate depends less on the hydrant than on the supply system's dynamic conditions.
Can the hydrant claw on the UH DN 100 be reduced to the more frequently used claw on the UH DN 80?
Yes. There is an adapter claw, but it raises the connection, and there is a replacement claw that is interchangeable with the VAG UH DN 10.
Does the upper column of the NOVA standpost hydrant fit on the lower pillar of model 266/166 and/or model 38?
No, but model 166/266 comes with a complete upper column as spare parts set.
How is a hydrant connected to a service pipeline?
The DVGW Guidelines W 331 apply when connecting a hydrant.
Hydrants are usually connected through a (preferably short) branch line and a
duck-foot bend. The duck-foot bend must consist of an N-piece or an EN-piece. When an EN-piece is used, a PE-duct can be directly connected.
Moreover, the hydrant can also be directly placed on a T-piece on the service pipeline.
What kind of maintenance do hydrants require?
The maintenance requirements are described in the DVGW Guideline W392:
This Guideline describes the maintenance and inspection measures that must be carried out every four years.
A list of spare parts for hydrants ....?
The spare parts lists for hydrants can be downloaded as PDF files from VAG's website.