Continental Trade Sp. z o. o.

Armature

Useful information

Pressure class and materials
PN pipeline components materialallowable working pressure in the pipeline (bar) at a temperature (°C)
armatura z kołnierzamiscrews acc. to
DIN 2507 s. 23)
Grey cast iron 4)ductile iron4)cast carbon steelsteel201)
(120)
200250300350400
6 GG-20 GGG-38 - St7-2 4D 6*) - - -    
6 5 4,5*) 3,6*)    
10 GG-20 GGG-38 GS-45 St7-2 4D 102)
- - -    
10 8 7*) 6*)    
16 GG-20 GGG-38 GS-45 St37-2 4D 162)
- - -    
16 13 11*) 10*)    
- - GS-C25 C22N C35 16 14 13 11 10 8
25 - GGG-38 GS-45.5 C22N 4D5) 252)
- - -    
25 20 18 16    
- GS-C25 C35 25 22 20 17 16 13
GS-22Mo4 15Mo3 24CrMo5     25 22 20 19
GS-17CrMo55 13CrMo44 24CrMoV55       25 24 23
40 - - GS-45.5 C22N 4D5) 40 32 28 24    
40 - - -    
GS-C25 C35 40 35 32 28 24 21
GS-22Mo4 15Mo3 24CrMo5     40 35 31 30
GS-17CrMo55 13CrMo44 24CrMoV55       40 38 36
63 - - GS-C25 C22N C35 63 36 29 24    
63 50 45 40    
63 - - -    
63 50 45 40 36 32
GS-22Mo4 15Mo3 24CrMo5     63 56 50 47
GS-17CrMo55 13CrMo44 24CrMoV55       63 61 58
100 - - GS-C25 C22N C35 100 80 70 60    
100 - - -    
100 80 70 60 56 50
GS-22Mo4 15Mo3 24CrMo5     100 87 78 74
GS-17CrMo55 13CrMo44 24CrMoV55       100 95 91
160 - - GS-C25 C22N C45 160 130 112 96    
160 - - -    
160 130 112 96 90 80
250 - - GS-C25 C22N C45 250 200 175 150    
250 - - -    
250 200 175 150 140 125
315 - - GS-C25 C22N C45 315 250 225 192    
315 - - -    
315 250 225 192 180 160
400 - - GS-C25 C22N C45 400 320 280 240    
400 - - -    
400 320 280 240 225 200
1) Pressure is allowed to carbon steels in the range of from -10 ° C to 120 ° C
2) resistance to 120 ° C: for liquid
3) the strength of the bolts is given to a temperature  15 ° C below the working temperature,
4) for valves of cast iron should be considered standard operating pressures (eg. to DIN 3201)
5) for soft gaskets or made of soft metal, screws C35 should be used,
*) allowable operating pressure for fittings with GG-20 and screws 5D take as up to 200 ° C.

 

Saturated Steam Table by Pressure
PressureSaturation temperaturePressureSaturation temperature
bar°Cbar°C
0,01
0,015
0,02
0,025
0,03
6,6
12,7
17,1
20,7
23,7
8,5
9,0
9,5
10
11
172,1
174,5
176,8
179,0
183,2
0,04
0,05
0,06
0,08
0,10
28,6
32,5
35,8
41,1
45,4
12
13
14
15
16
187,1
190,7
194,1
197,4
200,4
0,12
0,15
0,20
0,25
0,30
49,0
53,6
59,7
64,6
68,7
17
18
19
20
22
203,4
206,2
208,8
211,4
216,2
0,35
0,40
0,50
0,60
0,70
72,3
75,4
80,9
85,5
89,5
24
26
28
30
32
220,8
225,0
229,0
232,8
236,4
0,80
0,90
1,0
1,1
1,2
93,0
96,2
99,1
101,8
104,2
34
36
38
40
42
239,8
243,1
246,2
249,2
252,1
1,3
1,4
1,5
1,6
1,8
106,6
108,7
110,8
112,7
116,3
44
46
48
50
55
254,9
257,6
260,2
262,7
268,7
2,0
2,2
2,4
2,6
2,8
119,6
122,6
125,5
128,1
130,5
60
65
70
75
80
274,3
279,6
284,5
289,2
293,6
3,0
3,2
3,4
3,6
3,8
132,9
135,1
137,2
139,2
141,1
85
90
95
100
110
297,9
301,9
305,8
309,5
316,5
4,0
4,5
5
5,5
6,0
142,9
147,2
151,1
154,7
158,1
120
130
140
150
160
323,1
329,3
335,0
340,5
345,7
6,5
7,0
7,5
8,0
161,2
164,2
167,0
169,6
180
200
224
225
355,4
364,2
372,0
374,0
Installation, Operating, and Maintenance Manual for Sight Glass Fittings Type 520, 530, 531

Installation, Operating, and Maintenance Manual for Sight Glass Fittings Type 520, 530, 531


It is mandatory that you read this installation and maintenance manual ! It will be dangerous if you don’t read this !

This manual is also available as a PDF file available here.  Instrukcja montażu, użytkowania i konserwacji wzierników typu 520, 530 i 531 

1. Important Safety Information and Safety Instructions

1.1 Area of Application and Intended Use

The sight glasses may only be used as intended. Any applications beyond this will be considered to be usage not according to the intended purpose, and the manufacturer will not be liable for any resulting damage. Users will bear any risks in that case. Any unauthorized mechanical or structural modifications of the sight glasses will exclude any manufacturer liability for damage resulting from the modifications.
The intended use also includes compliance with manufacturer conditions for the intended installation, operation and maintenance (operating manual) as well as the consideration of foreseeable misconduct. The sight glasses have been supplied with information labels that must be observed.

1.2 Important Safety Information and Safety Instructions

1.2.1 Basic Safety Information

Statutory accident-prevention regulations as well as any other generally recognized safety-related, occupational health provisions must be observed. Any usage beyond this will be considered to be contrary to the intended use. The manufacturer shall not be liable for any damage resulting from this. The operating manual is part of the scope of delivery. If the sight glasses are resold, it must be handed over to the new owner.

To ensure safe operation, the sight glasses may only be used, maintained or repaired by specialized and trained staff members.
Qualified staff members include individuals who are aware of relevant standards, regulations, accident-prevention provisions through their training, experience and instruction, which entitles them to perform the necessary activities and enables them to recognize and avoid any potential hazards. 

The operator must make sure that the individuals assigned to operate, service, and maintain the sight glasses have read and understood the operating manual and that they will observe it in every respect, so:

  • they will avoid any hazards for health and lives of users and any third parties
    and
  • exclude any downtime and environmental impact by false handling.

Work responsibilities must be defined clearly and complied with, so there is no uncertainty where safety matters are concerned.

Any work on sight glasses may only be performed during a standstill of the system or when lines are free from any media. In places where lines can be opened or filled, signs must be set up which indicate clearly that work is being performed on the sight glasses.
After any maintenance work all disassembled protective devices must be properly reassembled. Protective devices and their protective effects must be checked by an expert before start-up of the machine.

Any warranty claims become void if:

  • Damage occurs because of improper operation,
  • Damage occurs because of improper storage,
  • Repairs or interventions are performed by unauthorized individuals,
  • Accessories and spare parts are used that are not compatible with the sight glasses,
  • If no original spare parts are used.

Any failures must be reported immediately upon their detection. The sight glasses must be labelled appropriately. Any defects must be repaired immediately, so the damage is kept to a minimum and the safety of the machine is not impaired. In the event of non-compliance any warranty claims will become void.

The manufacturer reserves the right to any modifications in the sense of technical improvements.

1.2.2 General Safety Instructions

These safety instructions are by no means exhaustive. If any questions or problems occur, please contact the manufacturer.
The sight glasses have been built using state of the art technology. They are delivered in a reliable state.

The sight glasses may only be installed and operated according to the conditions laid down in the performance and supply contract.

Any retrofitting, modification or conversion of the sight glasses is prohibited as a matter of principle. You should consult the manufacturer in any case.

1.2.3. Special Safety Instructions

Any instructions affixed directly on the sight glasses, such as type plate, warning instructions, etc. must be observed. They must be free from paint and dirt. Missing signs must be replaced.

Sight glass plates/fittings must be handled with special care:

Relevant safety regulations – particularly for pipes under pressure and temperature and their elements – must be observed.

Observe item 4 before the first start-up !
Observe items 5 and 6 when cleaning and maintenance are performed !

Any assembly and maintenance work may only be performed when pipes are not under pressure and when they have cooled down. Supply lines must be closed reliable. This also applies to discharge lines in case of back pressure.

Only use original spare parts.

Attention:
Under operation the sight glass fittings are under internal pressure. They are usually hot! If maintenance is performed during operation of the system, there is a risk of serious burns and acid burns from leaking medium.

Always wear protective clothing and goggles !

Explanatory figure of the sight glass

2. Product Description and Purpose

Sight glass fittings are built into pipes (flanged, screwed, or welded). Their purpose is to enable the operator of the plant to perform a visual inspection of the medium flowing through the piping - as far as quality and quantity are concerned. For that purpose the fittings have been provided with two opposite sight glass plates.
For information on the design, dimensions and materials please refer to the relevant data sheets.

Before leaving our company all fittings must have been examined in a "pressure test with sample pressure", acc. to the requirements of the DGRL (see appendix I, sections 3.2.2 and 7.4 of the DGR“ as presently valid) and the AD2000 flyer HP 30 for pressure vessels (section 4.17) with 1.43 times the highest permissible pressure.

For that purpose we apply the higher demands acc. to section 6 of the AD2000 flyer, but this “pressure test with sample pressure” for tightness is performed with water and 1.50 times the highest permissible pressure at 20°C (or appropriate special arrangements).

3. Storage and Transport

The fittings are to be packaged properly and transported and stored in a way to protect them against dirt and moisture. In particular, the glass plates must be protected against external impact and scratching.

Storage: Between 0° and +40°C in a clean and dry room.

Storage time: 2 years at the most. Then the seals must be checked and replaced as needed.

Varnish: Cast iron and cast steel fittings have been provided with a primer that is to protect them against corrosion through transport and storage only.
So, don’t damage the primer. Condensation of water must absolutely be avoided.
Don’t remove protective caps until just before the assembly, to avoid damaging the sealing surfaces. In case of improper storage any warranty claims become void.

4. Proper Use and Choice of Materials:

Operating area and choice of materials are subject to the operator’s or plant designer’s responsibility. Dimension regulations of the pressure equipment directive as presently valid must be observed !

4.1 Body Material and Seals

They must be selected carefully and the flow-through medium as well as the operating conditions (pressure and temperature) must be considered.

4.2 Glass Plates

4.2.1 Soda-lime glass acc. to DIN 8902: max. 150°C

4.2.2 Borosilicate glass acc. to DIN 7080: max. 280°C
In low temperature areas there are threshold values for the glass plates.
However, the AD2000 flyer W 10 for body and screw materials must be observed !

4.2.3[nbspThe additional protection of the sight glass place through mica discs is recommended, especially when a demineralised condensate/steam mixture and pH values higher than approx. 8 occur.

4.3 Pressure and Temperature Limits According to EN 1092

MaterialPN50°C100°C150°C200°C250°C280°C
EN-JL 1040 16 16 16 14,4 12,8 11,2 9,6
1.0619+N 16 15 14,9 13,9 12,4 11,4 10,3
1.0619+N 25 23 22 21,7 19,4 17,8 16,1
1.0619+N 40 38 37,3 34,7 30,2 28,4 25,8
1.4408 16 13,9 12,4 11,2 10,3 9,6 9
1.4408 25 22,8 21,1 19,6 18,3 17,2 16,1
1.4408 40 34,7 31,1 28,1 25,8 24 22,6
1.4541 16 13,5 12,5 11,7 11 10,3 9,7
1.4541 40 33,8 31,3 29,3 27,6 25,8 24,2
1.4571 16 14,6 13,5 12,5 11,7 11 10,3
1.4571 40 36,4 33,8 31,3 29,3 27,6 25,8

4.4 Attention

The lowest value in the combination “body – seals – glass plates” determines the maximum permissible threshold values as far as temperature and pressure are concerned. In case of doubt: Check with us !

5. Installation and First Start-up:

5.1 Installation Positions

The installation position is discretionary (except for designs with flap: Horizontal or vertical with upward flow-through).

5.2 Direction of Flow

Where an embossed or engraved directional arrow exists for the flow direction, this must be observed in any case.

5.3 Before the Installation

Before the installation of sight glass fittings you must make sure that pipes and fittings are free from any contaminations.

5.4 Transfers

Any transfers of piping tensions to the sight glass fittings through the assembly procedure must be avoided.

5.5 Protection of Sealing Surfaces

Don’t remove protective caps until just before the assembly, to avoid damaging the sealing surfaces.

5.6 Installation

5.6.1 Flanged Connection 
Piping flanges must be concentric and plane-parallel. The flange size and the shape of the sealing surface must match the sight glass fitting (refer to DIN 2526). Distance of piping flanges = overall length of the sight glass fittings + 2 x seal thickness. The connecting bolts must be tightened in a crosswise sequence, step by step and evenly (refer to the image in item 7). The torques mainly depend on the sealing material used.

5.6.2 Female thread connection
The female thread of the sight glass fitting must match the male thread of the piping, depending on the kind, size, and gradient. During the screwing in the sight glass fitting must be held with a suitable open-end wrench or pliers directly at the end to be screwed in. Never hold it on the sight glass lids, because the glass might break.

5.6.3 Welded fittings
Before welding the welding ends of the sight glass fittings and the pipes must be cleaned thoroughly and checked to see if they match (diameter, welding chamfer, etc.). Welding may only be performed by qualified staff members with appropriate welding procedures and welding materials according to welding regulations. Electric welding is to be preferred.


Attention: Sight glass plates and seals must be removed or covered on the inside and outside before welding, to protect them against welding gas and welding spatters. - Refer to item 7: Replacement of sight glass plates .

5.7 First Start-up

5.7.1 Before the first start-up the torques of the fastening screws of the two sight glass lids must be checked and corrected (especially after long storage times !). The procedures and torques listed in item 7 (replacement of sight glass plates) must be followed !

5.7.2 After the first load with pressure and temperature a certain “setting” of the seals is to be expected. Therefore the torques of the fastening screws of the sight glass lids, as described in item 7, must be checked and corrected again, as needed, in a cold and pressureless condition.

6 Maintenance and Servicing

6.1 Sight Glass Fittings don’t require any special maintenance.

6.2 Servicing of the Sight Glass Plates

If the sight glass plates are dirty on the outside they may be cleaned carefully. The glass surfaces must never be scratched (risk of breaking !). Conventional cleaning agents, especially glass cleaners, may be used. Use a clean and soft cloth !

6.3 Internal Contaminations

Internal contaminations of the sight glass plates may be removed as described under item 6.2. If the contaminations cannot be removed through cleaning the sight glass plates must be replaced.
The sight glass plates must also be replaced if they have been damaged by the flow or an aggressive medium and their surface has become rough (risk of breaking !).
For the new assembly of cleaned or new sight glass plates you must always use new seals in an appropriate quality. Refer to item 7 (replacement of sight glass plates) and item 1 (safety instructions)

6.4 General Instructions:

Even though sight glass plates are highly resistant acc. to DIN 8902 and DIN 7080 they are wear parts with a limited life. This depends in a high measure of the specific stress during operation.

6.5 Glass abrasion

A heavy glass abrasion may seriously impair operational safety. So, if glass abrasion becomes obvious (e.g. if the glass looks "milky" white) you must replace both sight glass plates with the seals.
It is recommended that you document the specific life of the glass plates, so you have empirical values on their life in the specific area of operation. This also means you are able to plan the routine replacement of glass plates in a timely and sufficient manner.

Glass abrasion depending on the operating conditions

7 Replacement of Sight Glass Plates

7.1 Attention:

All work must be performed by qualified staff members, and the safety instructions in item 1 and below must be observed ! - Glass plates must be handled with special care !

7.2 Disassembly

7.2.1 Removal of Cover Flanges
Loosen the fastening screws of the cover flanges in several steps and crosswise. Remove cover flanges.

7.2.2 Removal of the Sight Glass Plate
Remove the sight glass plate as well as the internal seal and the intermediate layer on the side of the lid.

7.2.3 Preparation of the sealing surfaces
Carefully clean the sealing surface on the body as well as the supporting surface in the cover flange, removing sealing remainders. Check for damage (grooves, erosions, impact spots, etc.). Both surfaces must be absolutely clean, level and free from damage !

7.3 Reassembly

7.3.1 Insertion of the new sight glass plate 
Insert the new internal seal (on the media side) and the new sight glass plate with proper dimensions and quality exactly in the centre. The marking on the seal and the glass plate must show outward. The seal may not project into the view diameter d1. - The glass plate must show a consistent gap with reference to the cylindrical sight glass cut out on the complete external diameter. It should be approx. 1 – 1.5 mm. The glass plate and the metal body may never touch each other !
Because of the different thermal expansion coefficients this would lead to damage and failure of the glass plates !

7.3.2 Insertion of the Glass Pad
Insert the external intermediate layer (cover side pad) and the sight glass lid exactly centred on the glass plate. The gap of approx. 1 – 1.5 mm mentioned above that must remain between the glass plate and the cover flange must always be observed.

7.3.3 Insertion of Cover Flanges
Screw in the fastening screws carefully and slightly tighten them manually. - The seal, the glass plate, the intermediate layer and the cover flange must not be moved ! The threads and the bearing surfaces of the fastening screws must have been lubricated with temperature-resistant thread paste (such as OKS ANTI-Seize paste), to avoid erosion and to guarantee defined friction values.

7.3.4 Tightening of the Screws

Now all screws must be tightened in several small steps and crosswise (according to the image), using a torque wrench and the torques listed in the table below. All screws must show exactly the same tightening torque to avoid glass tensions ! The sequence of screws tightening

Torques in [Nm] – for the cover screws for lubricated screws and for standard graphite seals.

Glass
ø d2 [mm]
View
ø d1 [mm]
4x M84x M104x M124x M144x M168x M16
45 32 11 13 -- -- -- --
63 48 13 20 23 -- -- --
80 65 -- 25 30 -- 55 --
100 80 -- -- 44 -- 73 55
125 100 -- -- -- 83 -- 55
150 125 -- -- -- -- 128 73
175 150 -- -- -- -- -- 80
200 175 -- -- -- -- -- 91

Correction factor for other seal materials:

PTFE:     above values x 0.5
Aramid fibre:   above values x 0.7
Viton, silicone, EPDM etc.   above values x 0.6
Other:   available on request

Note: When you use sight glasses with a PN > 40 or a special design, the torques must be obtained from the manufacturer.

7.3.5 Second, opposite side of sight glass 
Disassemble and reassemble as described under 7.3.1 through 7.3.4.

7.3.6 Final Inspection
Finally you must check the tightness of the fitting ! The fitting must at least be examined in a "pressure test with sample pressure", acc. to the requirements of the DGRL (see appendix I, sections 3.2.2 and 7.4 of the DGR“ as presently valid) and the AD-2000 flyer HP 30 for pressure vessels (section 4.17) with 1,43 times the highest permissible pressure.

7.3.7 After Start-up
After the first re-start-up you must check the cover screws acc. to item 5.7 in a cold and pressureless condition and correct them as needed, because new sealings may "set".

Material Designations
EuropeUSA
(AISI)
Japan
(JIS)

Unified
Numbering
System
(UNS)

Material NumberDIN naming schema
1.4000 X6Cr13 403 SUS403 S40300
1.4001 X7Cr14 429 SUS429 S42900
1.4002 X6CrAl13 405 SUS405 S40500
1.4005 X12CrS13 416 SUS416 S41600
1.4006 X12Cr13 410 SUS410 S41000
1.4016 X6Cr17 430 SUS430 S43000
1.4021 X20Cr13 420 SUS420J1 S42000
1.4028 X30Cr13 420 SUS420J2 S42000
1.4057 X17CrNi16-2 431 SUS431 S43100
1.4104 X14CrMoS17 430F SUS430F S43020
1.4113 X6CrMo17-1 434 SUS434 S43400
1.4125 X105CrMo17 440C SUS440C S44004
1.4301 X5CrNi18-10 304 SUS304 S30400
1.4303 X4CrNi18-12 305 SUS305 S30500
1.4305 X8CrNiS18-9 303 SUS303 S30300
1.4306 X2CrNi19-11 304L SUS304L S30403
1.4307 X2CrNi18-9 304L SUS304L S30403
1.4310 X10CrNi18-8 301 SUS301 S30100
1.4311 X2CrNiN18-10 304LN SUS304LN S30453
1.4319 X3CrNiN17-8 302 SUS302 S30200
1.4372 X12CrMnNiN17-7-5 201 - S20100
1.4401 X5CrNiMo17-12-2 316 SUS316 S31600
1.4404 X2CrNiMo17-12-2 316L SUS316L S31603
1.4406 X2CrNiMoN17-11-2 316LN SUS316LN S31653
1.4429 X2CrNiMoN17-13-3 316LN SUS316LN S31653
1.4435 X2CrNiMo18-14-3 316L SUS316L S31603
1.4436 X2CrNiMo17-13-3 316 SUS316 S31600
1.4438 X2CrNiMo18-15-4 317L SUS317L S31703
1.4439 X2CrNiMoN17-13-5 317LMN - S32726
1.4449 X3CrNiMo18-12-3 317 SUS317 S31700
1.4460 X3CrNiMo18-12-3 329 SUS329J1 S32900
1.4462 X2CrNiMon22-5-3 - SUS329J3L S31803
1.4510 X3CrTi17 430Ti SUS430LX S43036
1.4512 X2CrTi12 409 SUH409 S40900
1.4521 X2CrMoTi18-2 444 SUS444 S44400
1.4529 X1NiCrMoCuN25-20-7 - - N08926
1.4539 X1NiCrMoCuN25-20-5 - - N08904
1.4541 X6CrNiTi18-10 321 SUS321 S32100
1.4542 X5CrNiCuNb16-4 630 SUS630 S17400
1.4546 X5CrNiNb18-10 348 - S34800
1.4550 X6CrNiNb18-10 347 SUS347 S34700
1.4565 X2CrNiMnMoNbN25-18-5-4 - - S34565
1.4567 X3CrNiCu18-9-4 304Cu SUS XM7 S30430
1.4571 X6CrNiMoTi17-12-2 316Ti SUS316Ti S31635
1.4718 x45CrSi9-3 HNV3 SUH1 S65007
1.4828 X15CrNiSi20-12 309 SUH309 S30900
1.4841 X15CrNiSi25-20 310 SUH310 S31000
1.4842 X12CrNi25-20 310S SUS310S S31008
1.4845 X8CrNi25-21 310S SUS310S S31008
1.4864 X12NiCrSi35-16 330 SUS330 N08330
1.4878 X8CrNiTi18-10 321H SUS321 S32109
Note: Technical changes and errors reserved !

While every attempt has been made to verify the source of the information, no responsibility is accepted for accuracy of data.

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