Γείωση Εγκαταστάσεων

Transcription

1 ΤΕΧΝΙΚΗ ΠΡΟΔΙΑΓΡΑΦΗ ΕΠΑ-WS-0 EN ISO 900:2000 ΣΥΝΤΑΞΗ: TMHMA ΤΕΧΝΙΚΗΣ ΥΠΟΣΤΗΡΙΞΗΣ Θ. Πολυμενάκος Γείωση Εγκαταστάσεων ΕΛΕΓΧΟΣ: ΕΠΙΤΡΟΠΗ ΤΕΧΝΙΚΩΝ ΠΡΟΔΙΑΓΡΑΦΩΝ ΕΠΑ ΑΤΤΙΚΗΣ Ι. Τσιμπλάκης ΕΓΚΡΙΣΗ: ΕΠΙΤΡΟΠΗ ΤΕΧΝΙΚΗΣ ΔΙΕΥΘΥΝΣΗΣ ΕΠΑ ΑΤΤΙΚΗΣ Α. Μυλωνάς Γ. Χουρδάκης Γ. Πολυμενάκος Ν. Νικολέρης Το παρόν αποτελεί περιουσία της εταιρίας και ως εκ τούτου απαγορεύεται η αναπαραγωγή μέρους, πληροφοριών ή του συνόλου αυτού χωρίς την προηγούμενη έγγραφη άδειά της. Είναι ελεγχόμενο μόνον εφόσον φέρει ανάγλυφη γκοφρέ σφραγίδα. / 2 Αναθεώρηση: η / Ημ/νία έγκρισης: 22/3/2007 PDF created with pdffactory Pro trial version

2 ΤΕΧΝΙΚΗ ΠΡΟΔΙΑΓΡΑΦΗ ΕΠΑ-WS-0 EN ISO 900:2000 Γείωση Εγκαταστάσεων Η ηλεκτρική εγκατάσταση συνίσταται να γειωθεί σύμφωνα με τα προβλεπόμενα στα πρότυπα ΕΛΟΤ ΗD 384 και ΕΛΟΤ ΕΝ Lighting Protection Components (LPC ), Part 2 Requirements for conductors and earth electrodes. Αναλυτικότερα η γείωση της ηλεκτρικής εγκατάστασης θα γίνει μέσω άμεσης τριγωνικής γείωσης αποτελούμενης από τρία ηλεκτρόδια διαστάσεων 3000μμ X Φ7, τα οποία θα είναι χαλύβδινα και επιχαλκωμένα ηλεκτρολυτικά με ελάχιστο πάχος επιχάλκωσης 250μm και τα οποία θα τοποθετηθούν μέσα στο έδαφος κοντά στο πίλαρ ώστε να σχηματίζουν ισόπλευρο τρίγωνο με πλευρά 3 μέτρων. Η σύνδεση των τριών ηλεκτροδίων μεταξύ τους θα γίνεται με πολύκλωνο χάλκινο αγωγό, διατομής x25mm 2. H σύσφιξη σύνδεση του αγωγού επί των ηλεκτροδίων γείωσης θα γίνει με ένα κατάλληλο ορειχάλκινο κοχλιωτό σφικτήρα Φ7 σε κάθε ηλεκτρόδιο. Η κάθε σύνδεση θα επιχριστεί με αντιδιαβρωτική επικάλυψη κατά το πρότυπο EΛOT EN Απαραίτητη προϋπόθεση για την αποδοχή της γείωσης είναι η συνολική αντίστασή της να μην ξεπερνά τα 5Ω Στο τρίγωνο γείωσης θα συνδεθούν δύο ανεξάρτητοι αγωγοί γείωσης (δύο μονωμένα καλώδια διατομής x6mm 2 έκαστο) προς το πίλλαρ. Ο πρώτος αγωγός γείωσης θα συνδεθεί στους ηλεκτρικούς πίνακες του πίλλαρ (πίνακας τροφοδοσίας των ηλεκτροκίνητων βαννών) καθώς και στον γνώμονα της ΔΕΗ και θα δημιουργήσει την ηλεκτρική γείωση. Ο αγωγός θα γειώσει επίσης και τα μεταλλικά μέρη του πίλλαρ. Ο αγωγός θα γειώσει επίσης και τα μεταλλικά μέρη του πίλλαρ. Ο δεύτερος αγωγός γείωσης θα συνδεθεί σε απομονωμένη μπάρα γείωσης που θα βρίσκεται στον χώρο τοποθέτησης των ηλεκτρονικών συσκευών ( γείωση ηλεκτρονικών οργάνων και συσκευών) Η γείωση των ηλεκτρονικών οργάνων δεν θα πρέπει να έχει ηλεκτρική επαφή με το περίβλημα του πίλλαρ που θα είναι γειωμένο μέσω της ηλεκτρικής γείωσης. Στην περίπτωση της εγκατάστασης υπέργειων ηλεκτροκίνητων βαννών θα πρέπει όλα τα μεταλλικά μέρη των εγκαταστάσεων των αποξεστών (μεταλλικοί αγωγοί, πλαίσια στήριξης των αγωγών αερίου) μετά τον μονωτικό σύνδεσμο να γειωθούν μέσω ανεξάρτητης άμεσης τριγωνικής γείωσης όμοιων προδιαγραφών ως ανωτέρω. Το παρόν αποτελεί περιουσία της εταιρίας και ως εκ τούτου απαγορεύεται η αναπαραγωγή μέρους, πληροφοριών ή του συνόλου αυτού χωρίς την προηγούμενη έγγραφη άδειά της. Είναι ελεγχόμενο μόνον εφόσον φέρει ανάγλυφη γκοφρέ σφραγίδα. 2 / 2 Αναθεώρηση: η / Ημ/νία έγκρισης: 22/3/2007 PDF created with pdffactory Pro trial version

3 ΤΕΧΝΙΚΗ ΠΡΟΔΙΑΓΡΑΦΗ ΕΠΑ-WS-006 EN ISO 900:2000 Προδιαγραφή εργασίας για την αντικατάσταση κύριων αγωγών με τη μέθοδο της κατευθυνόμενης διάτρησης (Guided moling and horizontal directional drilling) ΣΥΝΤΑΞΗ: TMHMA ΤΕΧΝΙΚΗΣ ΥΠΟΣΤΗΡΙΞΗΣ ΕΛΕΓΧΟΣ: ΕΠΙΤΡΟΠΗ ΤΕΧΝΙΚΩΝ ΠΡΟΔΙΑΓΡΑΦΩΝ ΕΠΑ ΑΤΤΙΚΗΣ ΕΓΚΡΙΣΗ: ΕΠΙΤΡΟΠΗ ΤΕΧΝΙΚΗΣ ΔΙΕΥΘΥΝΣΗΣ ΕΠΑ ΑΤΤΙΚΗΣ / Αναθεώρηση: 0 η / Ημ/νία έγκρισης: 20/8/2002 PDF created with pdffactory Pro trial version

4 PROCEDURE FOR MAINS REPLACEMENT- Guided Moling and Horizontal Directional Drilling (HDD) for Polyethylene (PE) PIPE. SCOPE This procedure gives guidance for operational personnel engaged on the replacement of existing mains by guided moling and drilling and should be used in conjunction with the corresponding Code of Practice. 2. REFERENCES Unless otherwise specified this document shall be used with reference to the latest editions of related procedures, standards and specifications dealing with safety, construction planning, traffic management, excavations, reinstatements, materials, plant and equipment, testing and commissioning. 3. SAFETY 3. General 3.. Unlike other trenchless replacement methods, such as mains insertion/sliplining, or swagelining, which involve rehabilitation of the existing main, all guided boring methods are used off-line. Consequently, this means that there is a considerably higher risk of danger to operatives with the potential hazard of accidental damage to utility apparatus, especially gas pipes or electricity cables in the vicinity of any proposed boring operations. (See Site operators safety guide - Appendix A) Detailed working instructions and procedures i.e. Operators Manual, for the use of the particular plant/equipment employed, should be obtained from the supplier, complied to, and used. In addition, all safety instructions, data sheets, and assessments of any substances hazardous to health, including lubricants, powdered bentonite type materials and additives, should also be obtained from suppliers and used Personal protective clothing shall be worn in accordance with company safety instructions and procedures, as well as those specified by suppliers. Excessive contact with lubricants should be avoided. When handling these materials, plastic disposable gloves, suitable eye protection (goggles) and facemasks should be worn. An approved gauze face mask and goggles shall be worn when working within metre of the exhaust from pneumatically powered impact moles. When noise levels are considered to be sufficiently high, ear defenders (muffs), shall be worn during boring operations Special care shall be taken during boring operations when the operator has direct metallic contact with the equipment. Attention shall be made towards avoidance of danger from cables using a cable avoidance tool (CAT). PDF created with pdffactory Pro trial version

5 3..5 Operators shall not stand in the reception pit, because of the risk of being struck by the guided mole/drill, or in unsupported deeper pits where there is the risk of ground collapse as the mole/drill enters the pit. Whenever practicable, the operators should stand clear of the borehole to avoid the risk from a sudden blast or discharge of air, lubricant or debris along the bore. No attempt shall be made to closely watch the progress of a mole/drill through the mouth of an impacted bore The equipment shall not be allowed to operate unattended A safety isolation valve or an emergency stop button shall be sited in a readily accessible position in order that the operator may stop the machine in an emergency A site specific risk assessment shall be undertaken in accordance with the requirements of the Site Operators Safety Guide as provided in Appendix A, before guided moling/drilling commences. Site specific risk assessments will vary between different jobs, but as a guide, examples for directional drilling are detailed in Appendices B and C of this procedure. 4. SITE SURVEY 4. Where practicable, information on the position of plant in the vicinity of the proposed line of the moling/drilling operation shall be obtained. On site checks, including the use of plant location shall also be made to locate and, where appropriate, to confirm the position of buried pipes and cables. Where the Engineer considers it necessary, site meetings with representatives of other utilities and plant owners should take place. 4.2 A survey of the proposed route of the operation shall be carried out to establish the line and level of all other existing underground plant. The survey should include the use of cable and pipe locators and the lifting of inspection covers to determine depths of plant where applicable. The line of underground plant should then be clearly marked on the ground surface. If there is any doubt about the validity of underground plant information within the vicinity of the proposed bore, trial holes should be excavated to expose the plant. 4.3 Where manholes are to be lifted, proper lifting equipment shall be used and care taken to avoid sparks or damage to underground plant or covers. Suitable action shall be taken to ensure the safety of pedestrians and other road users. The appropriate authority should be notified where necessary. 4.4 Once a preferred route has been established, further trial holes may be necessary to ensure freedom from obstructions on that route as well as check suitability of ground conditions for either moling or drilling. The use of a small diameter pilot bore hole may be considered prior to a larger diameter moling/drilling operation, in order to confirm the viability of the selected route and to provide alignment for the larger mole or drill reamer. PDF created with pdffactory Pro trial version 2

6 5. PROXIMITY TO OTHER PLANT The accuracy of the line of the bore is dependent upon three main factors: a) the skill, communications and care exercised by the operators of both the guided boring machine and tracking equipment used to monitor progress to ensure the mole/drill does not deviate from its planned path. b) the characteristics of the soil and ground conditions. c) the characteristics of the individual guided moling/drilling machine used. 5. Where guided moling/drilling is to be used several times at one location, sufficient hand excavated trial holes shall be made to confirm the position of all underground plant. 5.2 In general, the machine should be aligned to give the maximum clearance from other underground plant, but not less than 250 mm clearance for all bore lengths. The Engineer shall decide whether to increase, decrease or maintain these clearances after evaluating the site specific risk assessment, previously undertaken, or to cease the moling/drilling operation. When moling, consideration should be given to the effect of soil displacement on adjacent underground plant, especially when using moles greater than 00 mm diameter. 5.3 Where appropriate, consideration should be given to excavating on, or alongside significant plant, in order to ensure that it does not obstruct the free passage of the mole/drill. All boring should be carried out below the construction depth of a made-up or finished surface. 5.4 The minimum depths of cover as specified in company procedures shall apply or 7 times the diameter of the reamed-out, or expanded, finished borehole, whichever is the greater. 6. PREPARATION OF THE SITE 6. All excavations shall be carried out and protected in accordance with company excavation procedures. 6.2 To minimise risk of damage to underground plant, it is recommended that the guided mole or drill be launched from the most congested side of the proposed drive route or crossing. For services, consideration should also be given to commencing the bore at the main, to ensure accuracy at the connection to the main. The depth to mole/drill diameter ratio may be varied at the discretion of the Engineer. PDF created with pdffactory Pro trial version 3

7 6.3 The launch pit should be excavated to the minimum required size, depending upon the boring technique used, and provision should be made for: a) Removal of the mole or drill head at the reception pit. b) Reversal of the mole or drill, pulling PE pipe behind it. c) Where the process of pipe stitching is used, intermediate pits may have to be expanded to allow for their subsequent use as new launch pits. 7. MACHINE OPERATION AND PE PIPE INSTALLATION 7. General 7. Machines should be operated and maintained in accordance with individual machine operating instructions Every precaution shall be made to protect the PE pipe from damage or ingress of lubricants, water or debris. Suitable rollers shall be provided at the pipe insertion pit and for the full length of any straight welded pipe strings and plastic end caps or rubber stoppers used to prevent ingress of foreign substances As-built drawing records, should be prepared, following installation of the polyethylene pipe and produced for the attention of the Engineer. 7.2 Guided Moling 7.2. Where large diameter moles with expanding heads are used, additional precautions may be necessary with respect to: a) depth of bore and ground heave; b) winching arrangements; c) mechanical handling. The importance of each of these requirements will depend upon the circumstances applicable on site, and shall be determined by the Engineer. Safe use of excavators for mechanical handling and lifting purposes and safety of winching operations are both detailed in Appendix A and Appendix B of the Part B procedure for mains insertion The minimum depth of bore and proximity to other plant shall be as described in clause Both launch and reception pits shall be re-surveyed with pipe and cable location equipment before commencing operations. The base of the launch pit shall be flat and reasonably level and compacted for setting up the launching cradle and aiming frame. Extreme care shall be exercised when driving in cradle anchor spikes and survey poles. PDF created with pdffactory Pro trial version 4

8 7.2.4 Distance markers (coloured PVC adhesive tapes) can be used at intervals on the machine supply air hose to monitor progress or locate the position of any rock outcrops or other obstructions or unexpected route deviations. Additional (colour-coded) markers may also be fixed to indicate the expected positions of underground plant, where additional care may be required. Although the depth and location of the mole is tracked using a sub-site locator, readings may sometimes be lost or in error especially where there is a prevalence electromagnetic radiation from above or below ground high voltage electricity cables. The moling operation shall be stopped and interrupted in these circumstances and not allowed to continue until the Engineer has identified the source of the problem. Any faulty locators, batteries or transmitter sondes should be replaced before work re-commences. A written depth, distance, direction and line log should be recorded between launch and reception pits Moles which cannot accept full compressor pressure, shall only be used in conjunction with an approved regulator set to the appropriate maximum pressure limit specification of the mole, to avoid damage to pressure seals etc For satisfactory operation of the mole, it is necessary to ensure that an adequate supply of an approved lubricant is delivered to the mole in accordance with the machine operating instructions The alignment of the mole shall be set-up before launching, using the sighting frame and re-checked by others before proceeding. If any error is found, the mole should be realigned During the operation, the progress and position of the mole shall be constantly monitored. If it is suspected that the mole is deviating from its planned route which cannot be corrected by the torquer steering wheel device, or has met an obstruction, the machine should be stopped and the cause investigated Care shall be taken to slow down the mole as it enters the reception pit. Damage to the machine and any other plant in the reception pit may result if this precaution is not taken The first hole bored can be used as a pilot hole, for enlargement using larger diameter moles fitted with expander heads in order to install larger diameter pipes Following completion of a successful boring operation, the PE pipe should be inserted in accordance with the mains insertion procedure. PE pipe of nominal diameter 63 mm and above may be pulled in behind a mole. 7.3 Guided drilling /Horizontal directional drilling (HDD) 7.3. Only a trained and certified machine operator, who is fully conversant with the operation, procedures and maintenance requirements of the particular machine to be used, shall be permitted. PDF created with pdffactory Pro trial version 5

9 7.3.2 All machine safety checks shall be undertaken in accordance with manufacturers instructions, with particular attention to safety covers and guards on moving and rotational parts, emergency stop button, cable strike alarm and Faraday Mat earthing facility Prior consideration should be given to site haulage and lifting requirements, especially with static guided drilling machines. Self-drive tracked mobile machines are usually transported to site using de-mountable trailers or articulated lorries depending upon the size of the machine. Once on site, self-propelled units can be driven between launch and reception pits, without further transport or lifting requirements Prior attention to lubrication and drilling fluid supply, use of and disposal is necessary. Although the smaller machines tend to have self contained, lubricant storage and mixing tanks, the larger machines normally require up to a 2,500 litre capacity plain water storage tank and a 2,500 litre bentonite or polymer drill fluid mixing tank. Unless water is transported to site using water tankers or bowsers, a water supply will be required on site from either local water utility stand-pipes, or abstraction from a nearby water course. Permission is normally required from the authority concerned in both of these instances. Large water and mixing tanks will require extra provision for transportation, when used at different locations on the job Biodegradable lubricants and oils should be used whenever possible, and safe handling of these chemicals as detailed in the safety data sheets provided with the supply of these materials should be observed Depending upon the type and size of guided drilling machine used, additional protection to excavations may be necessary. Launch, reception, intermediate or adjoining excavations could overfill with drill cuttings and drilling fluid. The excavations should be of sufficient size to contain the same volume of drilling fluid as that stored, particularly in the launch pit. Additional special precautions and security to prevent access by pedestrians or accidental falls into the excavation using close-linked, un-scaleable, 2 5 metre high steel reinforced mesh fencing may be necessary, subject to the Engineers discretion Where the Engineer considers it necessary, the sides and base of the drill pits should be lined with an impervious material such as plastic sheeting and, trench supports used to prevent ground collapse. All possible sources of pollution (i.e. entry and exit points) or potential over-spill from the excavations should be contained using up to two courses of sandbags in or around excavations. Spill kits should be readily available on site to absorb any accidental spillages of oil, diesel or drilling fluids During and after the drilling and PE pipe insertion process, attention will be required for the continuous removal of drill cuttings and surplus waste drilling fluid from the excavations. This is usually undertaken in the case of larger machines, by a waste slurry suction tanker, of the type used by the agricultural or sewage slurry industry for disposal to an approved waste facility. PDF created with pdffactory Pro trial version 6

10 7.3.5 Depending upon the specification of the machine used, the drill entry angle at the launch pit needs to be carefully considered as this affects the dimensions of the launch pit In the case of in-ground, static drilling machines, used below surface level and where a drilling shaft can be excavated, the surface area dimensions of the launch pit can be kept to a minimum as the entry angle can be as low as 0 to the horizontal. Depending upon the launch angle and depth of the drilling shaft required, the use of inground drilling could possibly require the need for extra trench supports, including trench ladders for use by operational personnel Where above ground, surface mounted machines are used, the usual drill entry angle of anywhere between 0 and 8 to the horizontal plane, (although this varies between machines), will mean larger surface area launch pit dimensions which could be as much as 3 m² or more for safe working. 7.4 Before drilling commences, the entire surface of proposed route between launch and reception pits shall be surveyed, with particular attention to colour-code marking the positions of all underground plant, using proprietary biodegradable road paint sprayed on the surface. Man-entry covers, should be lifted and depths from surface to invert level (bottom of pipe, drain or duct), diameters of sewers/drains/telecom. ducts and cover (from top of pipe/duct to surface level) recorded. In accordance with the preprepared site specific risk assessment, the Engineer shall decide on a safe working route and safe working depth range between launch and reception pits and where possible, such details shall also be painted on the surface, along the line of the proposed bore. 7.5 With reference to trial borehole information and possibly geological survey maps the appropriate drill head should be selected to suit the anticipated ground conditions i.e. rock or clay etc. It is also important to ensure that sufficient drilling rods are available on site to match that required for the proposed bore length and also allow for any rod breakages. The drilling operation should be smooth and continuous to avoid potential jamming of the drilling string, with the potential loss of drill heads or reamers, which may otherwise have to be recovered by further excavation. - (not always easy, especially under rivers) It is not recommended to cease operations for any lengthy period, whilst waiting for further equipment to be delivered on site, as ground conditions could collapse around the borehole and seize-up the drill. The most suitable drill head for the circumstances shall be attached to the lead rod on the machine and secured to the rod by using the appropriate tooling as supplied by the drilling rig manufacturer. 7.6 The setting-up, anchorage, operation and maintenance of the HDD machine shall be in accordance with the manufacturers operational manuals and instructions. Before propelling augured anchors attached to the drilling rig into the ground, due consideration will apply to the site specific risk assessment to ensure safety of operatives and avoid damage to underground apparatus. PDF created with pdffactory Pro trial version 7

11 7.7 The Sub-Site Locator should be calibrated in accordance with its operational instructions and the sonde, which is located in the drill head shall be checked for wear and that all batteries are fully charged The drilling machine operator, will then drill into the launch pit at a calculated degree angle in order to obtain the depths as required and agreed with the Engineer. 7.9 As the drill proceeds, bentonite or similar drilling fluid will be pumped down the drill rods, to enable the annulus that will be created to be held open and also provide a means of being able to remove the drill cuttings, which will be carried back to the launch pit. 7.0 After the second rod has been drilled into the ground, the operative who is fully trained in using the Sub-Site Locator system will locate the head to ensure both the locator and the drill head are correctly calibrated, and will then take both depth and angle readings. These will then be sent back to the rig by remote radio signal using headset receivers and transmitters so that the drilling rig operator will be able to adjust the drilling head to the required angle. Readings shall be recorded by at least every 5 metres or less and continually passed back to the machine operator in order to make any required course correction adjustments. 7. The drill string will eventually enter the reception pit, where the operatives will carefully remove the drilling head with the appropriate tooling and proceed to place a suitable reamer on the drill string. This will enable the annulus to be cut to the required size. The reamer will then be reversed on the end of the drill string back towards the launch pit until the appropriate size bore is cut to accept the product pipe. 7,2 After pre-reaming has taken place the drill string/reamer will be drilled through the borehole again. The product pipe will then be attached to the end of the drill string via a set of chains and a swivel and a PE pipe towing head securely screwed into the leading end of the PE pipe string. 7.3 The operatives will pump the required volume of bentonite through the centre of the drill rods and reamer and through a number of jets, thus creating a mud cake in the borehole. This will surround the duct and fill any voids created by the drilling process, whilst the PE pipe is pulled back through the borehole. 7.4 After the product PE pipe has been successfully pulled through the borehole, the operatives will remove the towing head and reamer from the rods. 7.5 Care shall be taken to prevent the ingress of drilling fluid into the newly installed PE pipe, by using pipe stoppers, whilst the launch and reception pits are cleaned out of surplus spoil, drill cuttings and bentonite slurry. If any slurry or debris accidentally enters the pipe, it must be cleaned out as soon as possible by wet swab pigging or other suitable means as determined by the Engineer. 8. TESTING, CONNECTIONS AND COMMISSIONING These shall be carried out in accordance with those procedures designated for this purpose. PDF created with pdffactory Pro trial version 8

12 TECHNICAL SPECIFICATION -MR-008 LOW PRESSURE REGULATOR 6 FOR RESIDENTIAL & COMMERCIAL APPLICATIONS AUTHOR: SPECIFICATIONS AND CONTRACTS ENGINEER APPROVED: TECHNICAL DIRECTOR / 8 Revision:6 th /Date of approval:5/2/204

13 TECHNICAL SPECIFICATION -MR-008 LOW PRESSURE OUTLET REGULATOR FOR RESIDENTIAL & COMMERCIAL APPLICATIONS Contents. General Scope Operating Characteristics General Construction Requirements for both Underground and (or) Wall Mounded Regulators Special requirements for underground regulators Special requirements for Wall-mounted regulators Tests Certification Marking Delivery Annexes... 7 ANNEX... 7 Annex Annex / 8 Revision:6 th /Date of approval:5/2/204

14 TECHNICAL SPECIFICATION -MR-008 LOW PRESSURE OUTLET REGULATOR FOR RESIDENTIAL & COMMERCIAL APPLICATIONS. General. Scope This specification is referred to service regulators designed for use on domestic or commercial applications Operating Characteristics Nominal flow: 6,0,6,25,40,50,75,00 Nm 3 /h Inlet pressure- 4 bar Outlet pressure 25 mbar (unless otherwise determined at the order) 2. General Construction Requirements for both Underground and (or) Wall Mounded Regulators The equipment to be implemented must have unquestionable references of similar use elsewhere and must be properly designed for the required operating conditions (operating pressure and temperature, nature of fluid). Regulators shall be constructed according to the applicable international or national standards of the members of European Union. The inlet connection of the regulator must be sphero-conical. Regulators shall be capable to operate under ambient temperatures determined in MID 22/2004/EC. Regulators should allow for adjusting the outlet setting pressure, the outlet overpressure and the outlet under pressure on site. Regulators must be equipped with outlet pressure test point. Other requirements: Two stage diaphragm type regulator Incorporated shut-off valve activated in case of: Outlet under pressure Outlet over pressure Integrated relief valve activated in case of: outlet pressure above specification (overpressure) Manually operated, specially designed reset lever Excess Flow Safety shut-off device for the lack of feeding Safety shut-off for second stage diaphragm failure, diaphragm bursting Protective filter fitted to the regulator inlet Maximum noise level of the regulator : 70dB 3 / 8 Revision:6 th /Date of approval:5/2/204

15 TECHNICAL SPECIFICATION -MR-008 LOW PRESSURE OUTLET REGULATOR FOR RESIDENTIAL & COMMERCIAL APPLICATIONS The following features shall be recorded: AC (less or equal to0) SG (less or equal to 20) Where SG is the maximum permissible positive difference between the actual lock-up pressure P f and the set point P as, expressed as a percentage of the set point P as, e.g. SG = (P f - P as )/P as *00 The isolation valve fitted upstream the regulator shall be according to ELOT EN 33. It shall incorporate a mechanical compression joint for the connection with the PE pipe. A pressure tap shall be installed before the regulator. 3. Special requirements for underground regulators Regarding the underground regulators the following requirements must be satisfied:. Along with the regulator a flexible vent pipe PN 6, must be delivered. The flexible pipe must be delivered in coils approximately 8 m long. It shall have a grid and a protective cap at one end. The venting pipe shall be fitted to the box of the regulator at the field by the contractor and the length of the venting pipe must be adjustable at the field depending on the requirements of the specific service line. Proper fittings to fix the venting pipe must also be delivered. 2. The configuration of the inlet and outlet pipe will be aligned. The inlet and the outlet pipe shall be installed as close to the bottom of the protective box and at least 50-60cm from the cover of the protective box. The inlet and outlet pipe will end at a compressive coupler (joint), which will enable a PE pipe to be fitted. All parts of the underground module (relief valves, regulators, compressive joints etc) shall be protected against corrosion with proper dyeing.)the manufacturer must declare conformity of the anticorrosive protection to the applicable international or national standards of European Union members. 3. The relief valve shall not release gas inside the protective box but in the open air. The manufacturer shall provide a solution, which will be examined and accepted by the evaluation committee. It shall be noted that the whole regulation set must have only one venting pipe terminating at the external environment. All possible leaks from the underground module must be directed through the venting pipe of the box to the external environment. 4. The underground regulator shall be constructed in such a way to ensure proper (normal) function even when the regulator is fully merged into water and mud. 5. Proper fitting to fix the inlet and outlet pipe to the inlet and the outlet of the box must be delivered 6. Installation manual for the underground regulator must be delivered 4. Special requirements for Wall-mounted regulators Regarding wall mounted regulators the following requirements must be respected:. The protective box of the wall mounded regulator shall be according to EPA 008 specification and shall have ventilation on the front face of the box. The outlet-coupling pipe shall not be 4 / 8 Revision:6 th /Date of approval:5/2/204

16 TECHNICAL SPECIFICATION -MR-008 LOW PRESSURE OUTLET REGULATOR FOR RESIDENTIAL & COMMERCIAL APPLICATIONS incorporated in the supply by the manufacturer. The drawing in ANNEX portrays just an indicative configuration. 2. The outlet of the regulator shall be determined at the order. Hence, the manufacturer shall make proper provisions at the protective box. If the outlet of the regulator is requested at the top right of the protective box the regulator will be L type otherwise, it will be U type. 3. Proper space for easy handling shall be allowed in the protective box of the wall mounted regulator in order to assist easy assembly of the outlet pipe. Te manufacturer is required to 6 submit IFC for approval. Proper transition fitting (nipple) will be applied at the outlet of the regulator. At the tender documents the material of the outlet pipe (PE or galvanized) will be determined 4. In case in the outlet of the regulator a PE pipe is fitted then a compressive joint (will be provided at the end of the transition fitting (nipple). If in the outlet of the regulator a galvanized pipe is fitted then the outlet of the transition fitting shall be threaded (thread joint) All parts of the wall-mounted module shall be protected against corrosion with proper dyeing. The manufacturer must declare conformity of the anticorrosive protection to the applicable international or national standards of European Union members Tests 5. Tests must be conducted ensuring AC, SG and also: The regulator pressure set point The slam shut valve pressure set 5.2 Tightness tests Mechanical fittings under pressure (i.e. gaskets) as well as test points for repair, calibration and alteration purposes must be mechanically jointed to the regulator and tight under normal operating conditions. External tightness of the connections must be tested by the manufacturer. 5.3 Internal tightness of the regulator itself under normal operating conditions shall be verified. Test reports ensuring the internal tightness of the regulator are required Certification A certificate (3., EN 0204) is required for the regulator. The certificate must be accompanied with a report ensuring that the requirements of paragraph 5.. above are met. The report must also contain the following data: AC and SG. The regulator pressure set point and design pressure range The slam shut valve pressure set point 5 / 8 Revision:6 th /Date of approval:5/2/204

17 TECHNICAL SPECIFICATION -MR-008 LOW PRESSURE OUTLET REGULATOR FOR RESIDENTIAL & COMMERCIAL APPLICATIONS 7. Marking 6 An arrow marked on the body of the regulator shall indicate the direction of the gas flow. It is also required a conveniently positioned label, indicating the followings: Manufacturer and/ or common name in the trade Type of the regulator 8. Delivery Serial number Year of production Design pressure range. Outlet pressure CE mark The packaging for delivery shall be designed so as to avoid any deterioration during handling, transporting and storing. 6 / 8 Revision:6 th /Date of approval:5/2/204

18 TECHNICAL SPECIFICATION -MR-008 LOW PRESSURE OUTLET REGULATOR FOR RESIDENTIAL & COMMERCIAL APPLICATIONS 9. Annexes ANNEX : Indicative configuration of a low pressure regulator installed in a box ANNEX 2: Indicative technical solution for the vending pipe ANNEX 3: Indicative dimensions of inlet PE pipe ANNEX Fig. 2: Indicative configuration of a low-pressure regulator installed in a box. The protective box shall be properly constructed to permit an alternative outlet from the right side view of the box. Ref. No. DESCRIPTION Mechanical compression joint incorporated to the valve 2 Isolation valve 3 Spheroconical coupling 4 Low Pressure Regulator 5 Flat joint connection (gasket) 6 Outlet coupling pipe (not to be supplied ) 7 Protective box 7 / 8 Revision:6 th /Date of approval:5/2/204

19 TECHNICAL SPECIFICATION -MR-008 LOW PRESSURE OUTLET REGULATOR FOR RESIDENTIAL & COMMERCIAL APPLICATIONS Annex 2 Regarding underground regulators, in order to avoid the ingress of water and the subsequent failure of the regulator, the following solution is proposed: The venting pipe of the relief valve should be half the diameter of the central venting pipe of the regulating set and shall terminate within the central venting pipe slightly above the surface level. Annex 3 Indicative dimensions of inlet PE pipe: For regulators. R6-R6 inlet R25-R65 inlet R00 inlet 32 The abovementioned dimensions must be followed unless otherwise determined at the order. 8 / 8 Revision:6 th /Date of approval:5/2/204

20 -MR-04, mbarg 0 00 m 3 /h : : / 5 : / :5/2/204