Berkefeld TWA 6 Operating Instructions Manual

Operating instructions TWA 6

Please keep for future use!

Contents

I Description TWA 6

II Standard dosing plan

“Berkefeld EMERGENCY EXERCISE and ACTION (full) SDP“

III Short operating instructions TWA 6

IV Operating instructions TWA 6

V Trouble-shooting

VI Maintenance work and repair work

VII Operating instructions and spare parts lists for aggregates

VIII Loading list, loading plan

I Description TWA 6

Process description in general

The Berkefeld drinking water purifier serves for provision of hygienically perfect,

crystal-clear drinking water.

Every normally polluted and germ-contaminated surface or well water can be

treated. The unit is not suitable for desalination of brackish or sea water.

Berkefeld drinking water purifiers operate acc. to the precoat filtration process.

The raw water from rivers, lakes or wells is pumped into 4 pre-treatment tanks (8

m³ each) by means of a motor pump or electr. pump. In the single raw water tank

the chemicals acc. to the Berkefeld EMERGENCY EXERCISE or ACTION SDP

(standard dosing plan) are added. The addition is effected in four steps with

corresponding retention time. The water pre-treated this way is supplied to the

precoat pump via the surface suction device and via the raw water collector.

In the beginning of the filtering process a certain quantity of filter material (Berkesil

KE) is fed to the precoat filter by the precoat pump. By the following pre-treated raw

water stream the filter material is precoated to the special Berkefeld filter candles

located in the precoat filter, and there it forms the filtering layer. Flow direction in

the precoat filter is upwards (see attachment 6).

After the filtration the required chlorine value in the pure water is adjusted by

means of a chlorine dosator being connected in subsequent position. The

chlorinated pure water is supplied to the pure water tank, and after a retention time

it is supplied as drinking water to tanks or distributors by a pure water pump. By the

secondary chlorination a re-infection is prevented.

With increasing pollution of the filter layer the filter head loss increases. If a filter

head loss of about 3 bar is reached, the filter process is interrupted and the plant is

backwashed. The flow direction in the precoat filter is now downwards. After

backwash, new filter material is precoated and the filter process starts again.

The pure water reservoir facilitates short-term output peaks of about twice the

capacity of the plant.

Since drinking water treatment is of utmost importance it is advisable to

follow these instructions exactly and to practise all processes described in

practice operation with starting and stopping the operation repeatedly.

A reliable operation can only be expected if the manual operation of the

plant has been thoroughly trained on exercises and the operating staff is

well acquainted with the functioning of the plant.

The exercises must be repeated every three months since an absolute

reliability in operating such appliances is only guaranteed by constant

repetition.

Attention

!

II Standard dosing plan

“Berkefeld EMERGENCY EXERCISE and ACTION (full) SDP“

1. The Berkefeld SDP is used in case of disaster abroad with unknown waters and - in

reduced extent - for exercises.

2. The EMERGENCY EXERCISE SDP is used with extremely strongly polluted,

unknown waters or in case of chemical disasters.

3. The ACTION SDP is exclusively used in case of defence.

The respective SDP is handled acc. to the time and dosing schedule.

Use of the chemicals acc. to the dosing and time schedule

Required chemicals for the TWA 6 raw water pretreatment per 8 m3 tank

1. HTH chlorine: Dissolve 800 g (100 g/m3) in 10 litres of water and fill it with the first

raw water into the tank. Filling time + 10 min reaction time

1.2 After reaction time, add 800 g (100 g/m3) ferric chloride, dissolved in a bucket,

evenly distributed into the tank. (Pay attention to the carbonate hardness!) Reaction

time 15 min

2. In the meantime assemble the other tanks, start filling and addition of chemicals as

described under 1.

3. After reaction time, add 1600 g (200 g/m3) activated carbon, mix in two buckets and

add in two steps with continuous intensive stirring. Reaction time 20 min

4. After reaction time, adjust pH-value. When required, add about 400 g (50g/m3)

calcium hydroxide, dissolved in a bucket, add into the tank evenly distributed.

Sedimentation approx. 30 min

5. Measuring of pH-value and chlorine content

Required values: pH-value between 7.0 and 7.5

Chlorine below 1.0 mg/l

Time required in total: filling time + 90 min

After this time the discharge from the first raw water tank via the precoat filter is

possible.

Hinweis für den Benutzer dieser Datei:

Einheitsdosierplan unter

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TWA 6 alt, englisch

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III Short operating instructions TWA 6

1. Filling the raw water pump with raw water and installation of a raw water tankincl.

all suction and delivery hoses.

2. Prepare the required chemicals for the TWA 6 per 8 m3 tank.

2.1 Dissolve chlorine acc. To the corresponding dosing plan in approx. 10 litres ofwater

and fill into the tank with the first water.

2.2 Keep the reaction time. Then dissolve ferric chloride acc. to the dosing plan in

approx. 10 litres of water and add into the tank. Keep the reaction time.

3. In the meantime, install the other raw water tanks and start with filling and addition

of chemicals as described in point 2.

4. Addition of activated carbon acc. to the dosing plan (in approx. 10 litres of water),

stir well, keep the reaction time.

5. After pH-measuring, adjust the pH-value by addition of lime (in approx. 10 ltrs. of

water), keep the reaction time and allow settling for about 20 - 30 min.

5.1 After each addition of chemicals one has to stir vigorously for about 5 min.

6. Installation of the precoat pump:

6.1 Prepare 2 kg Berkesil KE with about 10 ltrs. of treated water from the first raw water

tank (distributed to two precoat buckets, additionally provide another bucket of

water for rinsing).

6.2 Deaerate the precoat pump via raw water collector, 4-way suction valve and

precoat hose, precoat (approx. 4 - 5 m3/h; throttle slide valve).

6.3 3-way tap is on position “Filtration“. Only switch over to “Circulation“ if the water

drains off the pure water outflow.

6.4 Operate “Circulation“ for about 5 - 7 min. Then switch over to filtration. Rinse the

hose pipes incl. the water inflow pipe with pure water for about 30 sec.

6.5 Then switch to “Circulation“ and hang the pure water inflow pipe into the covered

pure water tank and install the chlorine dosator. Now switch to “Filtration“ again

and operate the plant with max. 6 m3/h.

7. Prepare chlorine for the chlorine dosator as follows:

Mix approx. 90 g HTH chlorine with approx. 9 ltrs. of water, stir well and fill this

solution into the chlorine dosator, deaerate and adjust to capacity (l/h = 1 mg Cl2/l).

Adjust with needle valve below the flow meter.

8. If the precoat filter reached a differential pressure of approx. 3 bar (difference

between the manometers being installed before and after the flow rate meter), the

plant has to be backwashed as follows:

9. The backwash of the precoat filter has to be carried out with the pure water pump

and the pure water via the connection “pure water". Quench for about six times

(about three times per tank), then precoat again via raw water.

IV Operating instructions for

Berkefeld drinking water purifier

TWA 6

Capacity 6 m3/h

Contents

IV 1. Colour of hoses and pumps

IV 1.1. Installation, pumps, hoses, raw water tank

IV 1.2. Operation/pretreatment unit

IV 1.3. Precoat filter

IV 1.3.1. Pure water tank and pure water distributor

IV 1.3.2. Operation of the precoat filter

IV 1.3.3. Backwash of the filter plant

IV 1.3.4. Backwash process of the precoat filter

IV 1.4. Chlorine dosator

IV 1.5. Checks during operation

IV 1.6. Dismounting of the unit and storage

IV 1.7. Important information

IV 1. Colour of hoses and pumps

All hoses and pumps are coloured.

All red hoses and pumps are raw water conducting plant components and may only

be coupled with this colour marking.

All white hoses and pumps are pure water conducting plant parts and may only be

coupled with this colour marking.

All black hoses are sludge water conducting plant parts can be coupled with red

hoses for extension if required.

Red and white plant parts must not be coupled.

The circulation hose is the only hose which is coloured red-

white because this conducts pure water and pretreated raw

water.

IV 1.1. Installation, pumps, hoses, raw water tank

Open supporting ring (see annex 1) in such a way that the supporting ring hinges

show to the bottom. Put 8 supports into the supporting ring and protect with the

chains. Bring the supporting ring as near as possible to the discharge point.

Take raw water tank from the packing (packing see annex 3), unfold and suspend

into the supporting ring in such a way, that the outflow hose shows to a discharge

possibility (pit, at running waters below the water discharge point etc.).

Suspend discharge hose into the supporting ring. Install the other three raw water

tanks in the same way and place as near as possible to the first.

Assemble the suction sets (see Attachment 2) correspondingly and couple them to

the raw water tanks from inside. Suspend suction sets with the end support into the

supporting ring.

Attention

!

Install the raw water pump as close to the intake place as possible. Connect one or

two raw water suction hoses with strainer, protective basket and plastic float with

chain on suction side. Secure the suction valve and hoses with an arrester cable.

Hang the raw water inflow pipe into the first raw water tank and connect it to the raw

water pump with a corresponding number of raw water pressure hoses. The raw

water inflow pipe is alternately hung into all raw water tanks which are then being

filled.

Now the four raw water tanks have to be coupled to the raw water collector with

additional raw water suction hoses. It has to be checked that all four ball valves of

the raw water collector are closed.

IV 1.2 Operation/pretreatment unit

The raw water pump can be started acc. to the operating instructions for filling of

the first raw water tank (see VII).

While the first tank is being filled, one prepares the treatment chemicals (chlorine,

ferric chloride, activated carbon, lime) acc. to the respective standard dosing plan

in the 17 l buckets filled with raw water. Take care that the chemicals are never

added to the raw water tanks in undissolved condition. They should always be

dissolved and stirred in a 17 l bucket filled with pure water or, if not otherwise

possible, with raw water.

First fill in the water (approx. 10 l), then add the chemicals.

If the water level in the first tank has reached the knee at the raw water inflow pipe,

one adds the first chemical (chlorine). One proceeds with the other chemicals

(ferric chloride, activated carbon, lime) acc. to the standard dosing plan. Each time

adding chemicals one has to stir vigorously with the paddle so that the chemicals

are well distributed. (If available, the stirring can also be carried out with an air

pipe.)

If the raw water tank is filled, one throttles the raw water pump and hangs the raw

water inflow pipe into the next raw water tank. Here one proceeds just as with the

first raw water tank. The same applies to the third and fourth raw water tank.

After each filtration of a raw water tank a sludge layer remains. The new filling can

then be carried out as described in point IV 1.2 (use of the contact sludge). After

about 5 - 10 new fillings the sludge is drained off the tank.

IV 1.3 Precoat filter

The precoat pump has to be connected with the four-way suction valve. A raw water

suction hose has to be connected from the raw water collector to the four-way

suction valve (C-Storz).

The precoat hose which is 2 m long and which is equipped with one Storz coupling

D only has to be connected to the four-way suction valve. On the other side of the

four-way suction valve the circulation hose (red-white, length 5 or 10 m) has to be

connected with the circulation outlet (three-way tap) of the precoat filter.

On delivery side, a 5 m (or 2 x 5 m) raw water pressure hose has to be connected to

the precoat pump to the raw water inflow of the precoat filter. The raw water inflow is

always at the flow rate meter of the precoat filter.

The distances should be as short as possible (5 m circulation hose and 5 m raw

water pressure hose). The precoat filter should be installed as horizontally as

possible so that a proper deaeration can be effected.

The sludge hose (only equipped with one Storz-C coupling) is coupled to the Storz-

C outlet of the precoat filter. An extension can be effected by means of red suction

hoses.

The pure water pressure hose is coupled to the pure water outlet (three-way tap) of

the precoat filter.

Take care that the pure water hoses are not thrown into the dirt

as this is the drinking water side.

At the end of the pure water pressure hose the chlorine dosing is connected and

supplied to the covered 8 m³ pure water tank with a further pure water pressure

hose via the pure water inflow pipe.

The pure water inflow pipe to the pure water tank is not hung into the tank but

attached to the outside of the pure water tank so that the first pure water can be

discharged (rinsing of the pure water pipes - about 30 sec).

Installation of the chlorine dosator only after the pure water side has been rinsed.

IV 1.3.1 Pure water tank and pure water distributor

The pure water tank has to be installed just as the raw water tanks (see point IV 1.1;

packing see Attachment 3). After hanging-in of the tank into the supporting ring, the

support for the cover has to set into the tank, braced by a “spider” with the

Attention

!

supporting ring and the cover has to be laid on the bracing (see annex 1). Brace the

cover with the cords at the supports of the supporting ring.

Pay attention to utmost cleanliness at the pure water tank.

Then on suction side the pure water pump is coupled with a pure water suction hose

and a gate valve to the pure water tank (Storz C). On delivery side of the pure water

pump, a corresponding pure water pressure hose is connected to which either a

pure water distributor, a tapping pistol or the socket for the tank filling (truck) can be

connected.

IV 1.3.2 Operation of the precoat filter

The raw water pretreated in the raw water tank can now be supplied to the precoat

pump by opening the first ball valve at the raw water collector. Open main ball valve

and precoat ball valve of the four-way valve, deaerate the precoat hose and fill both

precoat buckets with approx. 10 l of water. This is also the easiest way to deaerate

the pump. Then close both ball valves.

Then add the precoat material to both buckets (2 kg Berkesil KE, 1 kg per bucket).

Another bucket with pretreated water is required for washing down the mixed precoat

material. The precoat material has to be well stirred and wetted with a wooden stirrer.

At the beginning of the precoat process the slide valve being placed before the flow

rate meter of the precoat filter has to be opened a little (2 - 2 ½ rotations) so that the

precoat process can be carried out with a capacity of approx. 4 - 5 m³/h.

The deaerators of the precoat filter are opened, the sludge discharge ball tap is closed

and the 3-way-tap is in position „filtration“. The precoat pump is started, the ball tap of

the 4-way device at the precoat hose is opened and the precoating mass is sucked. If

this process is finished, the ball tap of the 4-way suction device at the precoat hose is

closed and the main ball tap of the 4-way device is opened for raw water feed.

The circuit ball tap of the 4-way device is always open. The pump construction allows

that the precoating process can be carried out with low motor speed (fuel saving). As

soon as water flows out through the deaerators of the precoat filter, they have to be

closed. If the water flows through the pure water pipe at the precoat filter after a short

time, the 3-way tap has to be turned to position „circuit“.

Attention

!

The deaerators have to be opened from time to time, so that entered air can escape.

After approx. 5-7 min. circuit operation the 3-way tap is brought to position „filtration“

again.

The first water (approx. 30 sec.) should be used for rinsing of the pure water pipes.

Only hereafter the pure water inflow pipe is put in the pure water tank. The full capacity

of 6 m³/h is adjusted with the slide valve preceding the flow rate meter of the precoat

filter. The pump pressure before the flow rate meter should be adjusted to 1 bar above

filter resistance with the adjustment of the pump speed.

The minimum capacity shall not fall below 1000 l/h. The filter loss of head is readable

at the pressure manometers of the precoat filter. The filter loss increases with

increasing pollution. The adjusted capacity reduces, so that readjustment has to be

carried out at the slide valve. If a filter loss of head of approx. 3 bar is reached at a

capacity of approx. 2 m³/h and at full pump capacity, the filtration process has to be

interrupted, as otherwise the plant operates uneconomically.

IV 1.3.3. Backwashing of the filter plant

During backwashing, the precoat filter is backwashed shock-wise in reverse

direction, i.e. downwards. By shocking in batches (see annex 4) the solid filter layer

is separated from the cartridges and flushed out through the sludge outflow hose.

The precoat filter must be backwashed with pure water.

IV 1.3.4. Bachwashing process of the precoat filter

Turn the 3-way tap of the precoat filter to position „circuit“. Close slide valve

preceding the flow rate meter of the precoat filter. Switch-off precoat pump. Close

main ball valve of the 4-way fitting. Open ball valve of the sludge outflow hose at the

precoat filter. Open de-aeration taps of the precoat filter. Uncouple circulation hose

at the circulation outlet of the precoat filter and wait until the precoat filter is

emptied. Then connect the circulation hose again.

Close de-aeration taps and ball valve of the sludge outflow hose. Couple pure water

pump with the pure water pressure hose (which is coupled with the pure water outlet

of the precoat filter). Set 3-way valve of the precoat filter to position "Filtration" and

start pure water pump. The pump has to be operated with full capacity. If the slide

Attention

!

valve and ball valve are closed, the pressure manometer on precoat filter side

shows approx. 3 - 4 bar. The ball valve at the sludge outflow hose is opened

suddenly and remains open for approx. 5 sec., then close slowly. This process must

be repeated 6 times. The rinsing water flowing off the sludge outflow hose must then

be clear. The sludge discharge hose must be held on to during the backwashing

process or it has to be tied-up.

Switch-off pure water pump, let ball valve of the sludge outflow hose open, open de-

aeration valves and uncouple circulation hose at the circulation outlet and hold until

precoat filter is empty.

The precoat filter is backwashed and can be started again as described under item

IV 1.3.2.

Complete backwashing should not exceed 4 - 6 min.

IV 1.4. Operating instructions

for

chemical displacement dosator LC 9

for

Berkefeld drinking water purifier TWA

Contents

IV 1.4.1. Purpose of the unit

IV 1.4.2. Working method

IV 1.4.3. Addition of chemicals in proportion to the water supply

IV 1.4.4. Preparation of chemical solution

IV 1.4.5. Commissioning

IV 1.4.6. Shut-down

IV 1.4.7. Chlorine definitions

IV 1.4.1. Purpose of the unit

The unit is used for dosing of water treatment chemicals in mobile drinking water

purifiers. Installation can be carried out preceding or after a Berkefeld precoat filter

plant by coupling the unit with the connections between 2 hoses. Dosing is carried

out continuously into the treated pure water.

IV 1.4.2. Operation method

The dosator operates according to the back pressure displacement process, i.e. a

firmly installed jam screen is installed between two connections in the main water

flow, by which different pressure ratios arise in the two by-pass connections (∆ p).

∆ p

_____é ___________ê __



P 1 P 2

____________ ____________

By this the required quantity of water is supplied to the displacement tank via the

motive water pipe with flow meter and adjusting valve. The same quantity of

chemical solution is displaced and pressed into the main water flow. The adjustment

of the chemical quantity to be added is carried out by an adjusting valve at the flow

rate meter. The chemical solution is in a bag, which is housed in the displacement

tank and which fills it out completely.

Annex 5 shows the dosing unit. It consists of the following parts:

01 Dosing tank (displacement tank)

02 Displacement bag

03 Filling and dosing connection

04 Main connections (retarding disc pipe)

05 Flow meter with adjusting valve

06 De-aerator

07 Drain

including the required connection pipes.

IV 1.4.3. Chemical addition in proportion to the water supply

The quantity of the chlorine added is determined by the corresponding responsible

man in each single case. If no instruction has been given, we recommend to adjust

chlorination of the water having a chlorine excess of

0.5 - 1 mg Cl2/l.

The following mentioned common chlorinous chemicals are used:

1. Chlorine bleaching solution chlorine contents approx. 12 %

(sodium hypochlorite) (take care on temperature, gas evolution)

2. Chloramin chlorine contents approx. 28 %

3. HTH-chlorine (C8 powder) chlorine contents approx. 60 % - 65 %

(calcium hypochlorite)

If a chlorine addition of 1 mg/l is demanded and an operation of the drinking water

purifier with a capacity of 6 m³/h, the chlorine quantity to be added per hour would

be 6 g Cl2/h. The flow rate meter has a measuring range of 0.5 - 5.4 l/h.

The dilution ratio of the chemical solution has been chosen in such a way that a

chlorine quantity of 1 mg/l is added, if a flow rate of 1 l/h is adjusted at the control

valve. The ratio between adjusted flow rate and dosing quantity remains the same at

each adjustment.

For example: demanded chlorine addition of

0.5 mg Cl2/l = 0.5 l/h at adjusting valve

or

2.5 mg Cl2/l = 2.5 l/h at adjusting valve

If the drinking water purifier is operated with a lower capacity, the dosing capacity

reduces in the same ratio (∆p).

IV 1.4.4. Preparation of the chemical solution

Wear protection clothes!

When preparing the solution, 9 l pure water and the chlorine media (corresponding

to the concentration) in the following mentioned quantities have to be stirred well.

Chlorine bleaching solution 12 % 450 g

Chloramin 28 % 190 g

HTH-chlorine 60 % 90 g

After removal of the screwing, the prepared solution is filled (funnel) into the

chlorine solution bag. The tank deaerator must be opened.

Before refilling the empty dosator, the motive water has to be discharged through

the tank drain.

Before coupling the dosator into the pure water, the filter plant is switched again to

circuit.

IV 1.4.5 Commissioning

During commissioning of the dosator, the following points have to be carried out

exacty:

1. Close chlorine solution gate valve or separate quick-coupling

respectively

2. Close tank drain

3. Open adjusting valve completely

4. Open tank de-aeration until motive water flows out

5. Close tank de-aerator

6. Open chlorine solution gate valve or connect quick-coupling respectively and

wait until chlorine solution flows from the chlorine solution bag through the

transparent overflow pipe

7. Adjust control valve to demanded value

Attention

!

8. Control function of the dosing unit at the control valve and overflow

pipe

If the outflow for filling of a tanker has been elevated, the dosing quantity has to be

changed. Re-adjustment at control valve is absolutely necessary.

If no pure water is given and the filter plant is switched to circuit, the control valve

and gate valve have to be closed or the quick-coupling has to be separated

respectively. The dosator is switched off.

The dosator has to be uncoupled during backwash of the

precoat filter.

IV 1.4.6. Shut-down, storage

After shut-down the plant has to be discharged thoroughly. Open all valves, so that

the water can flow out from the displacement tank.

Especially the flow meter has to be protected against frost and has to be

stored in the box for accessories (blow through at opened adjusting valve).

Then unscrew the filling socket and pour out the residual chemical solution.

It is not allowed to take the full chemical bag from the tank,

as it would crack from its holding.

Attention

!

Attention

!

IV 1.4.7. L E A F L E T

“Chlorine Definitions“

„Effective chlorine“ (total chlorine)

The sum of the elementary chlorine (free effective chlorine), available in the water at

the point of time of analysis and its sterilizing acting compounds (bound effective

chlorine) is called „effective chlorine“ (total chlorine).

„Free effective chlorine“

Chlorine, which is available in a water in form of dissolved elementary chlorine (free

chlorine), hypochlorous acid or hypochlorid ions, is called as „free effective

chlorine“.

„Bound effective chlorine“

Chlorine, which is available in a water in form of oxidizing acting chlorine substitution

compounds (anorganic and organic chloramines) is called as „bound effective

chlorine“.

Calculation as follows:

total chlorine

-free effective chlorine

= bound effective chlorine

=====================

IV 1.5. Controls during operation

All units operated with fuel must be checked at regular intervals on fuel and oil level

during operation, so that a perfect operation is guaranteed. If the precoat pump

would fail due to a leakage of fuel, the complete backwashing and precoating

process would have to be repeated.

The same situation would occur with the electrical pumps. The current generators

have to be checked continuously.

The quantity flow rate meter has to be controlled continuously during operation of

the precoat filter. Should - for any reason - the precoat filter suck air or should the

precoat pump fail, one would recognize this at the float of the flow rate meter and

one could switch the 3-way tap to „circuit“, so that the pure water cannot be

polluted.

The flow rate meter of the chlorine dosator also has to be controlled continuously,

so that no excess or less dosing can occur.

The motor pumps and the electrical pumps must in no case

operate in dry condition. This would cause a defect at the

axial face seal or stuffing box.

IV 1.6. Dismounting of unit and storage

Thoroughly drain the plant after backwashing, with special care the flow meters at

the filter tank and at the dosator (frost!).

Let all slide valves open, so that the air has free entry into the inside of the tanks.

Connections provided with blind couplings to be closed only during the drive, open

again in the depot.

The pumps have to be thoroughly drained before packing. Open the tap or screw at

the bottom of the casing and incline the pump correspondingly (frost!).

Before packing, all plant parts have to be cleansed. If a thorough cleaning cannot

be carried out at site, it has to be repeated in the depot or at any suitable place.

Before packing the raw water and pure water tanks have to be hung up at the small

rings. the raw water tanks can be flushed with pure water, then dry and folded acc.

to the attached plan (Attachment 3).

The plant is resistant to frost, provided that all plant parts have been thoroughly

drained.

The foldable tanks are made of rot-proof, artificial material coated textile. The hose

material is rot-proof as well. Despite this, hoses and tanks should be packed only

after air drying. All plant parts have to be checked on completeness and readiness

for use after each use.

Attention

!

IV 1.7. I M P O R T A N T N O T E S

If the first pre-treatment tank is pumped-off, one has to change-over to the second

one in time. This is carried out by opening the ball valve at the raw water collector of

tank 2 and only after that the ball valve of tank 1 is closed. The plant can be

operated continuously.

It is not allowed to interrupt the started filtration, as the filter layer would fall from the

filter cartridges if the water flow is interrupted. If, however, during or shortly after the

commissioning the water flow is interrupted due to any reason, the unit can be

started again (circuit approx. 5 - 7 min.)

The filter material fallen from the cartridges embedds by new start. If the plant had

already been switched to filtration, one has to operate again in circuit during restart.

But if the plant had been in operation for more than 1 hour, backwashing of the filter

material has to be carried out as well as new precoating.

The operation time of the plant strongly depends on the quality of the raw water in

the pretreatment tanks. In case of poor waters or at a very bad flocculation, the plant

can show already after 1 hour a differential pressure of 3 bar and has to be

backwashed. If the pretreatment is very good, running times of 5 - 7 hours and more

can be reached at full capacity.

Operation interruptions:

If no pure water discharge is required for a short period, i.e. for 30 min., the plant

capacity can be lowered by throttling the motor pump to approx. 1 m³/h. Then one

switches to circuit, by which a water loss is avoided and the filter is not polluted. If

water shall be given again, one only has to switch the 3-way valve from „circuit“ to

„filtration“.

The filter material Berkesil KE has to be prepared already during operation for the next

precoating. The precoating material only has to be stirred then and can immediately be

used for further precoating after backwashing of the precoat filter.

Take care that during operation of motor pumps, the fuel

tanks are refilled in time. Careful refilling of the motor

pumps with fuel is absolutely required. The same applies for

operation with electric pumps for the current generators.

Important

+

V Trouble shooting

Trouble

Reason Remedy

Electr. pump or motor

pump does not prime water

Pump not deaerated Deaerate pump by filling up

with water

Precoat pump does not prime water in

spite of deaeration Main ball valve of the 4-

way suction

device is closed Open corresponding ball

valves

Precoat ball valve of the 4-way

suction device is closed

Ball valve of the raw water collector

is closed

Suction device is still hanging on

the suspender ring Hang suction device into the

raw water tank

Electr. pump is operating,

is deaerated, but does not

supply water

Direction of rotation of the electr.

pump is wrong Change poles of direction of

rotation

Electr. pumps do not operate though

protective switch is switched on and

motor cable is plugged

Fault current protective switch in

the electric distribution box has

released

Switch on FI switch in the

distribution box again after

having checked it for

defective cables

One of the electr. pumps

does not operate though

the motor cable is plugged

Motor protective switch has

released Check pump for smooth

running (foreign matter,

damage at the bearing).

Restart motor protective

switch.

Precoat material does not adhere to

the filter candles Circulation ball valve of the 4-way

suction device is closed Open ball valve

Float of the flow rate meter „flutters“

during precoating Precoat filter not deaerated Open deaeration valve at the

precoat filter

Precoat pump failed Restart precoat pump

Chlorine dosator does not yield

chlorine Chlorine dosator is not deaerated Deaerate chlorine dosator

Needle valve of the flow rate meter

is clogged Clean needle valve

Bag without filling

Refill chlorine lye

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Berkefeld TWA 6 Operating Instructions Manual

Berkefeld TWA 6 Operating Instructions Manual

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