www.ergil.com

Absorption of Excess Pressure

Types of Surge Tank

ERGIL manufactu

Key Features

Dual-compartment surge tank is able to empty one tank compartment while filling another tank’s compartment.

Possession of sight glasses or magnetic level indicators as well as high and low level alarm on each compartment.

Automatic pressure-control valve normally open on gas outlets. Compliant with ASME VIII, Div. 1

Bladder Surge Tanks BLADDER:

The bladder is often made from a high tensile rubbers 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 comply with a flange at the top as per client’s vessel details. ERGIL Bladder Surge Vessel is designed to control the surge with a butyl rubber inside the vessel. In order to provide 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. Thus, there will be no need for a permanent regulation system including compressors, etc.

Introduction Surge vessel is a stand pipe or storage reservoir at the downstream end of a closed aqueduct, feeder, dam or a barrage pipe to control negative pressure as well as provide extra water during brief drop in pressure.

ERGIL is international manufacturer of different types of surge tank for potable or waste water pipeline, desalination plants, crude oil pipelines and other applications in horizontal and vertical alignments.

www.ergil.com

OPERATION The hydraulic analysis (pre-charge either compressed air or nitrogen) will give the result of value adjusted to the pre-charge of pressure. The water will go inside the vessel under static conditions and start to compress once the gate valve is opened. 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 in the line will begin to reduce and the elastic energy inside the vessel will led 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. 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. Maximum operating temperature 60-70°

Fig. 1 – Bladder Surge Tank and its main equipment

ERGIL Bladder Surge Tanks are provided for vertical and horizontal positions due to per customer’s requirement.

www.ergil.com

SURGE VESSEL AIR IN B

Fig. 2 - Surge Vessel Vertical 2D

SURGE VESSEL AIR IN BLADDER TYPE (EXPANDABLE &COMPRESSIBLE TYPE)

ERGIL Air in Bladder Type is charged within bladder inside the tank, and the air losses due to absorption are minimal. When the air does not come into contact with the liquid in the tank, the bladder will typically be pre-charged at installation with a pre-determined pressure to give the correct operating level in the tank when the unit is connected to the main and at the operating pressure. The bladder with highly elastic rubber, such as butyl rubber and may be sized to expand to fit the entire vessel. The anti- extrusion plate and inlet size are so selected. Thus, they do not restrict the flow in and out of the vessel to prevent the bladder from being drawn into the main at low pressures an anti-extrusion plate is fixed at the outlet of the vessel. The tank material is chosen compatible with the liquid since it comes in contact with the tank inner surface while flowing in and out from the main line.

Fig.2 - Surge Vessel Air in Bladder Vertical Type Surge Vessel Air in Bladder Horizontal Type

ERGIL is the manufacturer of surge vessel in air bladder type with vertical and horizontal positions due to your applications.

ERGIL manufactures any kind of surge tanks as per client’s requirement for industrial plants and applications.

www.ergil.com

Fsfas

SURGE VESSEL WATER IN BLADDER VERTICAL TYPE (EXPANDABLE &COMPRESSIBLE)

ERGİL’s Surge Vessel Water in Bladder Vertical Type, the air/media charge is contained within the tank, whilst the liquid

from the mainline flows in and out of the bladder as it is in the air in bladder design, the liquid does not come into

contact with the tank as well as the air charge. In this way, the air charge cannot be absorbed by the pumped media and

so air losses according to absorption are minimal. The whole tank is pre-charged at installation with a pre-determined

pressure to give the correct operating level in the tank when the unit is connected to the mainline and at the desired

operating pressure for this design. The Bladders are fitted with a flange at the bottom as depend on Client’s vessel

details. The static line pressure will be higher than the pre-charge pressure of the Tank. The water/media entering the

Bladder will further compress the pre-charged Tank until a perfect balance is created between the Water in Bladder and

the compressed air in Tank. On pump tripping or shutting the surge created in the mainline will push the water into the

Bladder.

The Bladders are fitted with a flange at the bottom as depend on Client’s vessel details. The static line pressure will be

higher than the pre-charge pressure of the Tank. The water/media entering the Bladder will further compress the pre-

charged Tank until a perfect balance is created between the Water in Bladder and the compressed air in Tank. On pump

tripping or shutting the surge created in the mainline will push the water into the Bladder. Size capacity for Vertical

Type has shown in below table.

Fig. 3 -Surge Vessel Water in Bladder Vertical Type 2D Drawing (A,B,C,D,ØH indicated for below capacity table)

.

www.ergil.com

CAPACITY (lt) ØD (mm) H(mm) B (mm) A(mm) C (mm) No.of legs

3000 Ø1200 3900 1400 80 45 3

4000 Ø1200 4800 1400 80 45 3

5000 Ø1500 4100 1700 80 45 3

6000 Ø1500 4650 1700 80 45 3

7000 Ø1500 5250 1700 80 45 3

8000 Ø1500 5750 1700 80 45 3

9000 Ø1500 6350 1700 80 45 4

10000 Ø1900 4765 2100 80 45 4

10000 Ø2100 4165 2300 80 45 4

12000 Ø1900 5465 2100 80 45 4

12000 Ø2100 4465 2300 80 45 4

15000 Ø1900 6560 2100 80 45 4

15000 Ø2100 5665 2300 80 45 4

18000 Ø1900 7550 2100 80 45 4

18000 Ø2100 6465 2300 80 45 4

20000 Ø1900 7550 2100 80 45 4

20000 Ø2100 6465 2300 80 45 4

25000 Ø2100 8565 2300 80 45 4

25000 Ø2500 6475 2700 80 45 4

30000 Ø2100 9965 2300 80 45 4

30000 Ø2500 7475 2700 80 45 4

35000 Ø2500 8375 2700 80 45 4

35000 Ø3000 6435 3200 80 45 4

40000 Ø3000 7135 3200 80 45 4

50000 Ø3000 8735 3200 80 45 4

60000 Ø3000 10035 3200 80 45 4

70000 Ø3000 11435 3200 80 45 4 Fig. 4 - Size table for Surge Vessel Vertical Type

Depending on the level of cubage in the tank it is possible to design by using minimum 3, maximum 4 legs as optional.

Capacities are available from 3000lt to 70000lt

www.ergil.com

SURGE VESSEL WATER IN BLADDER HORIZONTAL TYPE (EXPANDABLE &COMPRESSIBLE) ERGİL’s Surge Vessel Water in bladder type, the air/nitrogen charge is contained within the tank, whilst the liquid from the mainline flows in and out of the bladder. Like the air in bladder design, the liquid does not come into contact with the tank as well as the air charge, so again, the air charge cannot be absorbed by the pumped media and so air losses due to absorption are minimal. For this design the whole tank is pre-charged at installation with a pre-determined pressure to give the correct operating level in the tank when the unit is connected to the mainline and at the desired operating pressure. The bladders are made from a High Tensile Rubbers with or without reinforcements, in Neoprene, Nitrile (Buna-N), Food Grade Butyl or Rubbers, and may be expanded to fit the entire vessel. The Bladders are fitted with a Flange at the Bottom as per Client’s vessel details. A grid Plate or diffuser can be placed at the outlet of the vessel to prevent the bladder from being sucked into the mainline at low pressures. They are provided with Lugs/Hooks at the Top for hanging support. When the mainline valve is opened, the water/media will enter the Bladder under static condition and begins to compress the Gas filled Tank. The static line pressure will be higher than the pre-charge pressure of the Tank. The water/media entering the Bladder will further compress the pre-charged Tank until a perfect balance is created between the Water in Bladder and the compressed air in Tank. On Pump Tripping or shutting the surge created in the mainline will push the water into the Bladder. This pressure will be absorbed by the compressed air in the Tank and effectively reflex pressure will be applied on the surge. After multiple hammerings & oscillations, it will even out the pressure of the mainline and create a static state, without damaging the pipeline. Eventually the entire system will return back to dynamic state for the next surge.

Fig. 5 - Surge Vessel Water in Bladder Horizontal Type Drawing (A,B,C,ØD indicated for below capacity table)

CAPACITY (lt) ØD (mm) L(mm) C (mm) B(mm) H(mm)

3000 Ø1200 3500 1500 300 3600

4000 Ø1200 4500 2300 300 4500

5000 Ø1500 3800 1600 300 3800

6000 Ø1500 4300 2100 300 4350

7000 Ø1500 5000 2400 300 4950

8000 Ø1500 5400 3100 300 5450

9000 Ø1500 5900 3600 300 6050

10000 Ø1900 4450 2100 300 4465

10000 Ø2100 3850 1500 300 3865

12000 Ø1900 5100 2900 400 5165

12000 Ø2100 4250 2100 400 4165

15000 Ø1900 6300 3600 400 6260

15000 Ø2100 5450 2900 450 5365

18000 Ø1900 7250 5000 450 7250

18000 Ø2100 6250 3800 450 6165

20000 Ø1900 7300 5400 450 7250

20000 Ø2100 6150 4300 450 6165

25000 Ø2100 8300 5400 450 8265

25000 Ø2500 6200 3100 600 6175

30000 Ø2100 9650 5600 500 9665

30000 Ø2500 7150 4100 600 7175

35000 Ø2500 8050 5300 600 8075

35000 Ø3000 6200 2900 600 6135

40000 Ø3000 6900 3500 600 6835

50000 Ø3000 8500 5100 600 8435

60000 Ø3000 9850 6100 600 9735

70000 Ø3000 11200 7500 600 11135

Fig. 6 – Size Table for Surge Vessel Water in Bladder Horizontal Type

Depending on the length of the tank it is possible to design by using minimum 2, maximum 5 legs as optional.

Capacities are available from 3000lt to 70000lt

ERG.CTLG.0005.15.REV2

Middle East & Africa Region Jumeirah Lake Towers, X2 Tower 1906 P.O. Box: 123661 Dubai, U.A.E. Phone: +971 4 450 8051 Fax: +971 4 450 80 41 Sales inquiries: sales@ergil.com Website: www.ergil.com

C.I.S. Region Nizami Street 96E Landmark 1 Building Suite 434 Baku, Azerbaijan

Phone : +994(12) 480 4964

Mob : +994(50) 471 3882

Sales Inquiries: sales@ergil.com

Website: www.ergil.com

Headquarters Mahmutbey Mah. Taşocağı Yolu Cad. Ağaoğlu My Office 212 İş Merkezi No: 3 B Blok Kat:11, Ofis: 175, Phone: +90 212 485 40 07 (pbx) P.K 34218 Güneşli – Bağcılar / İstanbul / Turkey Fax: +90 212 485 40 42 Sales inquiries: sales@ergil.com