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Surge Vessel

NO MORE RISK FOR THE NEGATIVE PRESSURE!

ERGIL Surge Vessels is a powerful and user-friendly control system that protects your pipeline systems against water hammer & pressure transient.

Why do you need surge vessels in your applications?

Surge vessels (surge tanks) are important assets in the water treatment process, though incorrect maintenance and management can lead to issues in pipelines costs and the water industry millions every year, causing burst pipes, structural damage, negative pressures and colossal water wastage. Negative pressure directly contravenes Drinking Water Inspectorate (DWI) legislation due to the risk of contamination.

 

What is a surge vessel?

A surge vessel or water hammer is a standpipe or storage reservoir at the downstream end of a closed aqueduct or feeder or a dam or barrage pipe to absorb sudden rises of pressure, as well as to quickly provide extra water during brief drop in pressure.

Features:

  • Renowned company understanding of surge system design
  • Ensures compliance with Product Equipment Directive & ASME regulations
  • Reduces water leakage
  • Pipeline fatigue and bursts analyze
  • Minimizes risk of contamination in potable water pipes caused by negative pressures
  • Accommodates variable pumping regimes without dumping compressed air
  • Improves your company’s environmental social responsibility and public image

What types of surge vessels does ERGIL manufacture?

An Äager Brand, ERGIL is a global specialist in designing, engineering and manufacturing surge vessels with an extensive experience. ERGIL manufactures two types of surge vessel which are categorized as Bladder type and Compressor type for the water pipeline, desalination plants, crude oil pipelines and other applications. ERGIL provides surge vessels in horizontal and vertical types are available and orifice plates, butterfly valves, level instruments, pipeline etc. are provided as required.

Bladder Type Surge Vessel

The internal bladder is often made from high tensile rubber with or without reinforcements, in Neoprene, Nitrile (Buna-N), Food Grade Butyl or Hypalon Rubbers, or expanded to fit the whole vessel. The bladders are complying with a flange at the top as per client’s vessel details.

ERGIL Bladder Surge Vessel ( also called hammer tank, hydropneumatic surge control vessel or expansion tank )  is designed to control the surge with a butyl rubber inside the vessel. In order to provide the required elasticity to push the water into the system following a pump trip, calculation of pre-charge pressure will be vital. If there is no contact between the compressed air and the water, there will be no dissolution. In this way, there will be no need for a permanent regulation system including compressors, etc. When the vessel has been stimulated and correct the pre-charge has been introduced, the vessel will operate automatically, depressurizing once called upon and refilling with the return waves until naturally reaching its steady-state balance. The internal bladder is often made from high tensile rubber with or without reinforcements, in Neoprene, Nitrile (Buna-N), Food Grade Butyl or Hypalon Rubbers, or expanded to fit the whole vessel. The bladders are complying with a flange at the top as per client’s vessel details.

Features & Specifications:

  • Vertical or horizontal types are available
  • A bladder is fixed to the outlet/inlet connection orifice located on the bottom or the side of the vessel.
  • The bladder is designed so it can expand to the full size of the vessel. This allows for greater drawdown volumes and less stress on the bladder.
  • The air is trapped in the space between the outside of the bladder and the wall of the vessel. Therefore the liquid is not in contact with the steel walls of the vessel.
  • Depending on the level of cubage in the tank it is possible to design by using minimum 3, maximum 4 legs as optional
  • Design code: ASME and others
  • Capacities are available from 3000lt to 70000lt
  • Service Pressures Range: up to 25bar

 How does the surge occur?

Surge is expected when pumping water; it can occur when the flow rate of pumps at a pumping station is altered, valves opened/closed along the pipeline or uncontrolled pump-trips due to power cuts. These can lead to extreme pressures fluctuations which, if not controlled, can lead to disastrous consequences including burst pipes, unnecessary water loss, and supply disruptions. Negative pressures are far more prevalent than high pressures, considerably more destructive, as well as contravening Drinking Water compliance on potable water systems. 100% leakage reduction of any pumping main is impossible until potential surge pressures in the pumping main are reviewed.

 

Compressor Type Surge Vessel

 

 

OPERATION PRINCIPLE

First of all, the hydraulic analysis (pre-charge either compressed air or nitrogen) will give the result of value adjusted to the pre-charge of pressure. Then, the water will go inside the vessel under static conditions and start to compress once the gate valve is opened. Thus, the water will entire the vessel and led further compress the pre-charged gas until a balance between the liquid and the compressed gas is reached.  Right after a pump trip, the pressure in the pressure line will start to reduce and the elastic energy inside the vessel will lead the discharge of water from the vessel into the line. This situation prevents risky low pressure along the pipe. In the pipeline, pressure might become too low and the flow will reverse. Then the water will go into the vessel via reduced diameter (drilled non-return valve or bypass) if hydraulically required. Before the static state is reached, several oscillations may occur.

 

SOME OF OUR REFERENCE PROJECTS FOR SURGE VESSEL

 

 

Year

 2015

Location

 Kenya

Specification

 Supply of Horizontal Surge Vessel (Air in Bladder Type) 8000L

 
 
 
Year 

 2015

Location

 Malaysia

Specification

 Supply of Horizontal Surge vessel (Bladder Foam storage Tank with a capacity of 4000L. – 16Bar

 

Year

 2016

Location

 Malaysia

Specification

 Supply of Horizontal Surge vessel (Bladder Foam storage Tank with a capacity of 4000L. - 16Bar

Client

 2016

Location

 Nigeria

Specification

 Supply of Horizontal Surge vessel (Bladder Foam storage Tank with a capacity of 4000L)

Year

 2017

Location

 UAE

Spec.

 Vertical Surge vessel with a capacity of 20m3.

 


 

Year

 2018

Location

 UAE

Specifications

 Vertical Surge vessel with a capacity of 15 m3


 

Year

 2018

Location

 Jordan

Specifications

Vertical Surge vessel with a capacity of 5m3 x 5 Nos. m3.X 2 Nos. 

 

 

Documentation:

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