Tunnelling machines - Air locks - Safety requirements

This European Standard applies to the design, construction, equipping, marking and testing of air locks as defined in 3.3 including pressure bulkheads as defined in 3.4, which are to be used in tunnelling work. An oxygen breathing system used to provide the breathing supply necessary to conduct a safe decompression is also covered by this standard.
This European Standard is not applicable to machinery and equipment which is manufactured before the date of publication of this document by CEN.
NOTE   Air locks can be connected to tunnelling machinery. This standard can help the design of air locks and bulkheads in other compressed air work in construction.
This European Standard deals with all significant hazards, hazardous situations and events relevant to such machinery when they are used as intended and under conditions of misuse which are reasonably foreseeable by the manufacturer (see Clause 4).
This European Standard does not cover the supply of services to the air lock.
Vibration, noise and EMC (Electromagnetic compatibility) hazards are not significant hazards for air locks.
This European Standard does not cover the hazards due to the mobility of the machinery.

Tunnelbaumaschinen - Druckluftschleusen - Sicherheitstechnische Anforderungen

Dieses Dokument gilt für Form, Aufbau, Ausstattung, Kennzeichnung und Prüfung von Druckluftschleusen, wie in 3.3 festgelegt, einschließlich Druckwänden, wie in 3.4 festgelegt, die bei Tunnelbauarbeiten verwendet werden. Die zur Versorgung mit Luft eingesetzte Sauerstoffanlage, die für die sichere Durchführung einer Ausschleusung erforderlich ist, fällt ebenfalls in den Anwendungsbereich dieser Norm.
Dieses Dokument gilt nicht für Maschinen, die hergestellt wurden, bevor CEN dieses Dokument veröffent-lichte.
ANMERKUNG   Druckluftschleusen können mit Tunnelbaumaschinen verbunden werden. Diese Norm kann helfen, Druckluftschleusen und Druckwände für andere Arbeiten unter Druckluft zu konstruieren.
Dieses Dokument behandelt alle signifikanten Gefährdungen, Gefährdungssituationen und Gefährdungsereig-nisse, die auf Druckluftschleusen und Druckwände zutreffen, wenn sie bestimmungsgemäß und entsprechend den vorhersehbaren Bedingungen des Herstellers verwendet werden (siehe Abschnitt 4).
Dieses Dokument behandelt nicht die Wartungsversorgung der Druckluftschleuse.
Gefährdungen durch Schwingungen, Lärm und EMV (Elektromagnetische Verträglichkeit) sind keine signifikanten Gefährdungen für Druckluftschleusen.
Dieses Dokument behandelt nicht die Gefährdungen auf Grund der Beweglichkeit der Maschine.

Machines pour la construction de tunnels - Sas de transfert - Prescriptions de sécurité

La présente Norme européenne porte sur la conception, la fabrication, la fourniture, le marquage et les essais des sas de transfert définis en 3.3 y compris les parois de cloison de pression définies en 3.4, qui sont destinés aux travaux de creusement  de tunnels.
La présente Norme européenne ne s'applique pas aux machines et équipements qui ont été construits avant la date de publication du présent document par le CEN.
NOTE   Les sas de transfert peuvent être connectés aux tunneliers. La présente norme peut aider à la conception des sas de transfert et des parois de cloison de pression pour d’autres travaux de construction sous air comprimé.
La présente Norme européenne traite de tous les phénomènes, situations et événements dangereux significatifs relatifs aux engins de terrassement lorsqu'ils sont utilisés comme prévu ou dans des conditions de mauvais usage que le fabricant peut raisonnablement prévoir (voir Article 4).
La présente Norme européenne ne couvre pas la fourniture de réparations au sas de transfert.
Les phénomènes dangereux engendrés par les vibrations, le bruit et la CEM (compatibilité électromagnétique) ne constituent pas des phénomènes dangereux significatifs pour les sas de transfert.
La présente Norme européenne ne couvre pas les risques dus à la mobilité des machines.

Stroji za gradnjo predorov - Zračne zapore - Varnostne zahteve

Standard EN 12110 se uporablja za zasnovo, konstruiranje, opremljanje, označevanje in preskušanje zračnih zapor, kot je opredeljeno v točki 3.3, vključno s hermetičnimi pregradami, kot je opredeljeno v točki 3.4, ki se uporabljajo v delih v predorih. Dihalni sistem s kisikom, ki se uporablja za zagotavljanje dovoda zraka za dihanje, potrebnega za izvajanje varne dekompresije, je prav tako obravnavan v tem standardu. Ta evropski standard se ne uporablja za stroje in opremo, izdelane pred datumom, ko je Evropski odbor za standardizacijo (CEN) objavil ta dokument. Ta evropski standard opisuje vsa večja tveganja, nevarne situacije in nevarne dogodke v zvezi s takimi stroji, kadar se uporabljajo v skladu z njihovim namenom in pod pogoji pričakovane nepravilne uporabe, ki jih določa proizvajalec (glejte točko 4). Ta evropski standard ne zajema zagotavljanja storitev do zračne zapore. Tveganja, povezana z vibracijami, hrupom in elektromagnetno združljivostjo (EMC), ne spadajo med večja tveganja za zračne zapore. Ta evropski standard ne obravnava tveganj zaradi mobilnosti strojev.

General Information

Status
Published
Publication Date
20-May-2014
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
10-Oct-2012

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Tunnelbaumaschinen - Druckluftschleusen - Sicherheitstechnische AnforderungenMachines pour la construction de tunnels - Sas de transfert - Prescriptions de sécuritéTunnelling machines - Air locks - Safety requirements93.060Gradnja predorovTunnel construction91.220Gradbena opremaConstruction equipmentICS:Ta slovenski standard je istoveten z:EN 12110:2014SIST EN 12110:2014en,fr01-november-2014SIST EN 12110:2014SLOVENSKI

STANDARDSIST EN 12110:2003+A1:20081DGRPHãþD
SIST EN 12110:2014
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12110
May 2014 ICS 91.220; 93.060 Supersedes EN 12110:2002+A1:2008English Version
Tunnelling machines - Air locks - Safety requirements

Machines pour la construction de tunnels - Sas de transfert - Prescriptions de sécurité

Tunnelbaumaschinen - Druckluftschleusen - Sicherheitstechnische Anforderungen This European Standard was approved by CEN on 6 March 2014.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12110:2014 ESIST EN 12110:2014

EN 12110:2014 (E) 2 Contents Page Foreword ...................................................................................................................................................................... 3 Introduction ................................................................................................................................................................. 4 1 Scope .............................................................................................................................................................. 5 2 Normative references .................................................................................................................................... 5 3 Terms and definitions ................................................................................................................................... 6 4 List of significant hazards ............................................................................................................................ 7 5 Safety requirements and/or protective measures .................................................................................... 10 5.1 General .......................................................................................................................................................... 10 5.2 General requirements .................................................................................................................................. 10 5.3 Personnel locks ........................................................................................................................................... 12 5.4 Material locks ............................................................................................................................................... 17 5.5 Combined locks ........................................................................................................................................... 17 5.6 Pressure bulkheads ..................................................................................................................................... 18 6 Verification of safety requirements and/or protective measures ........................................................... 18 7 Information for use ...................................................................................................................................... 22 7.1 General .......................................................................................................................................................... 22 7.2 Signs, signals and warning devices .......................................................................................................... 22 7.3 Instruction handbook .................................................................................................................................. 23 7.4 Marking ......................................................................................................................................................... 24 Annex ZA (informative)

Relationship between this European Standard and the Essential Requirements of EU Directive 2006/42/EC ......................................................................................................................... 25 Bibliography .............................................................................................................................................................. 26

SIST EN 12110:2014

EN 12110:2014 (E) 3 Foreword This document (EN 12110:2014) has been prepared by Technical Committee CEN/TC 151 “Construction equipment and building material machines - Safety”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2014 and conflicting national standards shall be withdrawn at the latest by November 2014. This document supersedes EN 12110:2002+A1:2008. The following main technical changes have been made compared to EN 12110:2002+A1:2008. a) general revision of the structure of EN 12110;

b) revision of fire protection requirements;
c) revision of the access dimensions on air locks;

d) new structure of requirements for electrical equipment and the emergency provisions for power supply and lighting;

e) revision of requirements for oxygen supply. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive. For relationship with EU Directive, see informative Annex ZA which is an integral part of this document. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 12110:2014

EN 12110:2014 (E) 4 Introduction This document is a type C standard as stated in EN ISO 12100. The machinery and equipment concerned and the extent to which hazards, hazardous situations and events are covered are indicated in the scope of this document. When provisions of this type C standard are different from those which are stated in type A or B standards, the provisions of this type C standard take precedence over the provisions of the other standards, for machines that have been designed and built according to the provisions of this type C standard. SIST EN 12110:2014

EN 12110:2014 (E) 5 1 Scope This European Standard applies to the design, construction, equipping, marking and testing of air locks as defined in 3.3 including pressure bulkheads as defined in 3.4, which are to be used in tunnelling work. An oxygen breathing system used to provide the breathing supply necessary to conduct a safe decompression is also covered by this standard. This European Standard is not applicable to machinery and equipment which is manufactured before the date of publication of this document by CEN. NOTE Air locks can be connected to tunnelling machinery. This standard can help the design of air locks and bulkheads in other compressed air work in construction. This European Standard deals with all significant hazards, hazardous situations and events relevant to such machinery when they are used as intended and under conditions of misuse which are reasonably foreseeable by the manufacturer (see Clause 4). This European Standard does not cover the supply of services to the air lock. Vibration, noise and EMC (Electromagnetic compatibility) hazards are not significant hazards for air locks. This European Standard does not cover the hazards due to the mobility of the machinery. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 250:2014, Respiratory equipment — Open-circuit self-contained compressed air diving apparatus — Requirements, testing, marking EN 12021:2014, Respiratory equipment — Compressed gases for breathing apparatus EN 12464-1:2011, Light and lighting — Lighting of work places — Part 1: Indoor work places EN 60204-1:2006, Safety of machinery — Electrical equipment of machines — Part 1: General requirements (IEC 60204-1:2005, modified) EN 60529:1991, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989) EN 61000-6-1:2007, Electromagnetic compatibility (EMC) — Part 6-1: Generic standards — Immunity for residential, commercial and light-industrial environments (IEC 61000-6-1:2005) EN 61000-6-2:2005, Electromagnetic compatibility (EMC) — Part 6-2: Generic standards — Immunity for industrial environments (IEC 61000-6-2:2005) EN 61000-6-3:2007, Electromagnetic compatibility (EMC) — Part 6-3: Generic standards — Emission standard for residential, commercial and light-industrial environments (IEC 61000-6-3:2006) EN 61000-6-4:2007, Electromagnetic compatibility (EMC) — Part 6-4: Generic standards — Emission standard for industrial environments (IEC 61000-6-4:2006) EN 61310-1:2008, Safety of machinery — Indication, marking and actuation — Part 1: Requirements for visual, acoustic and tactile signals (IEC 61310-1:2007) SIST EN 12110:2014

EN 12110:2014 (E) 6 EN ISO 3411:2007, Earth-moving machinery — Physical dimensions of operators and minimum operator space envelope (ISO 3411:2007) EN ISO 5171:2010, Gas welding equipment — Pressure gauges used in welding, cutting and allied processes (ISO 5171:2009) EN ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction (ISO 12100:2010) EN ISO 13849-1:2008, Safety of machinery — Safety-related parts of control systems — Part 1: General principles for design (ISO 13849-1:2006) EN ISO 14113:2013, Gas welding equipment — Rubber and plastics hose and hose assemblies for use with industrial gases up to 450 bar (45 MPa) (ISO 14113:2013) IEC 60364-7-706:2005, Low-voltage electrical installations — Part 7-706: Requirements for special installations or locations — Conducting locations with restricted movement IEC/TR 60877:1999, Procedures for ensuring the cleanliness of industrial-process measurement and control equipment in oxygen service 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN ISO 12100:2010 and the following apply. 3.1 compressed air air with a pressure of more than 0,1 bar, above atmospheric Note 1 to entry: All pressures to be measured above atmospheric pressure. 3.2 working chamber space in which work in compressed air is carried out 3.3 air lock self-contained pressure vessel with one or more compartments that permits passage between areas of different pressure Note 1 to entry: The pressure vessel is equipped with access doors, which can be sealed and the vessel can be pressurized. It includes equipment for its safe operation. 3.3.1 material lock air lock for the passage of material or equipment only 3.3.2 personnel lock air lock for the passage of persons only 3.3.3 combined lock air lock for the passage of persons and material or equipment SIST EN 12110:2014

EN 12110:2014 (E) 7 3.4 pressure bulkhead structure which separates spaces with different pressure levels as part of an air lock 3.5 maximum working pressure highest pressure to which an airlock may be subjected in normal use 3.6 design pressure DP maximum pressure for which the equipment is designed as specified by the manufacturer Note 1 to entry: The design pressure is the maximum allowable pressure as derived from the EU Directive 97/23/EC concerning Pressure Equipment (PED). 3.7 test pressure TP pressure to which the equipment is tested 3.8 oxygen breathing system plant, pipework and ancillary equipment used to provide oxygen supply necessary for a safe decompression procedure 3.9 breathing unit part of the oxygen breathing system comprising a mask and regulator combination 3.10 main chamber compartment of a personnel lock in which decompression is normally carried out 3.11 entrance chamber compartment of a personnel lock which allows passage from atmospheric pressure to the main chamber 3.12 oxygen compatible can safely be used in contact with oxygen 4 List of significant hazards This clause contains all the significant hazards, hazardous situations and events, identified by risk assessment as significant for this type of machinery and which require action to eliminate or reduce the risk. SIST EN 12110:2014

EN 12110:2014 (E) 8 Table 1 — List of significant hazards Significant Hazards Hazardous Situation Safety Requirements and/or Measures Reference 4.1 Mechanical hazards: 4.1.1 Impact hazard/Squeezing No sharp edges, bumpers, warning signs, squeezing protection etc. 5.1 5.2.10 5.2.11 7.4 4.1.2 Uncontrolled change of pressure Design and construction of pressure vessels, piping and pressure housings. Marking and labelling. Control equipment and instrumentation Design and construction of bulkheads 5.2.1 5.2.2 5.2.3 5.2.5 5.3.5 5.3.6.2 5.3.6.3 5.3.9.2 5.4 5.6.1 7.4 4.1.3 Hazards resulting from the suction by differential pressure between the pressurized environment and atmospheric pressure Mesh grills for inlets of exhaust pipes 5.2.11 4.2 Electrical hazards: 4.2.1 Electrical contact, direct or indirect EN 60204–1 and IEC 60364–7-706 5.2.5 4.2.2 External influences on electrical equipment EN 61000–6-1 to −4 5.2.6 4.3 Thermal hazards: 4.3.1 Burns and scalds, by a possible contact of persons, by flames or explosions and also by the radiation of heat sources Flame retardant materials. Fire extinguishing system. Temperature limit for heating system 5.2.4 5.2.4 5.3.6.3 4.3.2 Health-damaging effects by hot or cold work environment Thermometer 5.3.6.2 4.4 Hazards generated by materials and substances processed, used or exhausted by machinery: 4.4.1 Hazards resulting from contact with or inhalation of harmful fluids, gases, mists, fumes and dusts Fire emergency provisions at the control panel Gas sampling lines/ Oxygen monitoring Ventilation Sufficient breathing units 5.2.4 5.3.6.3, 5.3.9.5 5.3.7 5.3.9.4

4.4.2 Fire or explosion hazards especially under increased pressure Water spray system Emergency relief valve Oxygen compatible materials 5.2.4 5.3.9.2 5.3.9.2 SIST EN 12110:2014

EN 12110:2014 (E) 9 Significant Hazards Hazardous Situation Safety Requirements and/or Measures Reference

4.4.3 Use of oxygen Cleaning of oxygen system Gas sampling lines Distribution network Suitable breathing units 5.2.11 5.3.6.3 5.3.9.3 5.3.9.4 4.5 Hazards generated by neglecting ergonomic principles in machine design (mismatch of machinery with human characteristics and abilities): 4.5.1 Unhealthy postures or excessive efforts Dimensions 5.3.2 5.3.3 4.5.2 Inadequate consideration of human anatomy Dimensions 5.3.2 5.3.4 4.5.3 Inadequate local lighting Interior Illumination acc. to EN 12464–1 5.3.6.4 4.5.4 Unhealthy insufficient dimensions and upholstery of the seats Dimensions and Insulation 5.3.3 4.6 Hazards caused by failure of energy supply, breaking down of machinery parts and other functional disorders: 4.6.1 Failure of energy supply (of energy and/or control circuits) Emergency Power Supply Emergency lighting 5.2.7 5.2.7 4.6.2 Errors of fitting Leak test of pressure systems 5.2.11 5.3.9.2 5.3.9.3 4.6.3 Uncontrolled decompression of working chamber or lock Protection against inlet line breaks Doors: Self-sealing/Interlock Pressure indicator 5.3.5, 5.3.8 5.2.10 5.3.6.3 4.6.4 Loss of communication Emergency Power Supply Second communication network Observation windows/CCTV 5.2.7 5.2.9 5.3.6.3 4.7 Hazards caused by (temporarily) missing and/or incorrectly positioned safety related measures/means: 4.7.1 All kinds of safety related (protection) devices Description in instruction handbook 7.3 4.7.2 Safety signs Location and meaning acc. to instruction handbook. 7.2 4.7.3 All kinds of information or warning devices Control equipment and instrumentation Oxygen storage and network Description in instruction handbook 5.3.6.2 5.3.9.3

7.2 4.7.4 Means of access for emergency personnel into the confined pressurized parts of the machine Number of compartments (entrance chamber) Dimensions Doors 5.3.1 5.3.2 5.3.4, 5.3.5 4.7.5 Emergency devices, Number of compartments 5.3.1 SIST EN 12110:2014

EN 12110:2014 (E) 10 Significant Hazards Hazardous Situation Safety Requirements and/or Measures Reference in particular means of evacuation of a casualty from a confined pressurized part of the machine (entrance chamber) Dimensions 5.3.2 4.7.6 Essential equipment and accessories for safe adjusting and/or maintaining Safe maintenance Lifting points Description in instruction handbook 5.2.11 5.2.11 7.3 4.7.7 Equipment for evacuating gases, etc. Sufficient number of breathing units Oxygen monitoring 5.3.9.4 5.3.9.5 5 Safety requirements and/or protective measures 5.1 General Air locks shall comply with the safety requirements and/or protective measures of this clause. In addition, air locks shall be designed according to the principles of EN ISO 12100 and for hazards relevant but not significant, which are not dealt with by this document (e.g. sharp edges). 5.2 General requirements 5.2.1 Design pressure The design pressure for the air lock structure shall be 1,1 times the maximum working pressure. Where bulkheads cannot be pressure tested the design pressure shall be two times the maximum working pressure. The calculation shall be carried out according to the finite elements method or equivalent calculation method. 5.2.2 Pressure relief valve Each air lock compartment shall be equipped with a pressure relief valve set at 1,1 times the maximum working pressure and capable of passing the whole air supply to the air lock. Once activated the valve shall close automatically when pressure is lowered back to the working pressure. A quick-closing valve located between the compartment safety valve and the compartment, easily accessible, kept open and sealed by a seal shall be used. 5.2.3 Pipes and hoses Pipes and hoses which form an integral part of the air locks shall be designed to withstand a maximum working pressures depending on their function NOTE The maximum working pressure in pipes and hoses can be significantly different to that of the air lock structure. The use of hoses shall be minimized and if used they shall be as short as possible. They shall withstand a burst pressure of at least 4 times the maximum working pressure of the hose. 5.2.4 Fire protection Personnel locks and material locks shall consist of materials and components selected to minimize their flammability under increased air pressure and which are of low toxicity when burning. SIST EN 12110:2014

EN 12110:2014 (E) 11 Fire fighting and other emergency provisions shall be provided at the control panel. These provisions shall be detailed in the instruction handbook. See Clause 7. It shall be possible to reduce the pressure in each compartment from 2 bar to atmospheric pressure in not more than 2 min in the event of fire by means outside the airlock. In each compartment the fire extinguishing system shall include either a hand-held extinguisher or a water hose inside. There shall also be a water spray system capable of being operated from inside and outside of the air lock; both of these to be suitable for the maximum working pressure of the air lock. A device for measuring the water supply pressure at the air lock and for displaying it at the control panel shall be installed. NOTE Criteria for the fire-extinguishing system are given in NFPA 99 and EN 16081. 5.2.5 Electrical equipment Electrical equipment for air locks shall comply with EN 60204-1:2006. Electrical equipment located inside personnel locks which is an integral part of them and is essential for the air lock operation shall comply with IEC 60364-7-706:2005 and shall be non-sparking. It shall be suitable for humid and wet spaces and be protected from dust deposits and spraying water to a minimum class of IP 55 of EN 60529:1991, Clause 4. Electrical equipment shall be designed to minimize the risk of fire and toxic fumes and to withstand pressure changes up to the test pressure of the air lock. Housings for electrical equipment shall be adequately ventilated or designed and tested to withstand pressure changes up to 1,3 times the design pressure of the air lock. 5.2.6 EMC (Electromagnetic compatibility) Electrical equipment used for air locks shall comply with the requirements of electromagnetic compatibility as specified in EN 61000-6-1:2007 to −4:2007. 5.2.7 Emergency Power Supply and Lighting The air lock shall be designed to accommodate an emergency power supply which shall power safety critical equipment in event of a failure of the main power supply. The emergency power supply shall be either an independent emergency power supply or part of the overall tunnel emergency power supply. It shall come into operation automatically when the main power supply fails and have a duration of at least 2 h. Safety critical equipment shall include lighting, communications, atmospheric monitoring equipment, electrically powered airlock pressure control system (if fitted) and Closed Circuit Television (CCTV) (if fitted). The emergency power supply system shall meet performance level c as defined in EN ISO 13849-1:2008. In addition there shall be a separate self-contained emergency lighting system at the control panel and in each compartment of the personnel lock with a duration of at least 1 h. The intensity of illumination provided by the emergency lighting shall be at least 15 lx at seat level. 5.2.8 Control panel Control equipment and indicating instruments, see 5.3.6.2, 5.3.9.3 and 5.4, which are outside the air lock shall be assembled in a control panel. They shall be easily readable and designed, constructed, arranged and marked so that their function and switching direction can be clearly recognized, in compliance with EN 61310-1:2008. They shall be illuminated with a nominal intensity of at least 100 lux. The control panel design shall particularly take into account ergonomics to allow the operator (supervisor) of the air lock to carry out his task in the best conditions (see EN 894 series). SIST EN 12110:2014

EN 12110:2014 (E) 12 The maximum A-weighted sound pressure level at the control panel shall not exceed 80 dB(A) at maximum designed flow rate in the pipes. The microphone should be arranged in the operator`s position at head level. 5.2.9 Communications A primary voice communication system shall be installed to connect working chamber, personnel locks and control panel. This system shall be of a push to talk type with speakers inside the compartments. A secondary communication system, which is independent of the power supply system, shall be installed. 5.2.10 Doors, closing and sealing Doors of air locks shall be self-sealing and kept shut by differential pressure. If the doors of materials locks cannot be self-sealed, a mechanical locking system shall be fitted, along with an interlock to prevent the mechanical lock from being released if there is air pressure against the door. Doors shall have a free operating space without affecting other installations or equipment. 5.2.11 Other requirements The inlets of pipes exhausting air from the air lock shall be covered by a mesh grill to prevent suction injuries and ingress of debris. For safe lifting the individual air lock shall be fitted with lifting points when applicable. In addition to the instruction handbook, basic operating and safety instructions for the air lock shall be clearly displayed at the lock attendant's control position (control panel) in a waterproof form. Services not related to the air lock but passing through the air lock shall be in a sleeve, e.g. steel pipe. Differential movement between the bulk heads shall be considered. 5.3 Personnel locks 5.3.1 Number of compartments Personnel locks shall consist of at least two directly interconnected compartments, a main chamber and an entrance chamber accessible from atmospheric pressure, with door openings as specified in 5.3.4. 5.3.2 Dimensions Personnel locks shall meet the following minimum requirements: SIST EN 12110:2014

EN 12110:2014 (E) 13 Table 2 — Minimum requirements

Main chamber Entrance chamber Minimum cross sectional dimensions (in any plane) If circular, 1,6 m

(see Figure 1) If not circular, see below If circular, 1,6 m (see Figure 1) If not circular, see below Length: see below 1,0 m Number of persons: 3 2 Volume per person: 1,0 m3 1,0 m3 If not circular a cross section with a minimum headroom of 1,5 m measured from the floor of the air lock (see Figure 2 as example) and with other dimensions to accommodate “large operators” in accordance with EN ISO 3411:2007, Figure 2, seated and having sufficient space to stretch the legs to an angle of 30° to the vertical. Dimensions in millimetres

Figure 1 — Circular air lock Dimensions in millimetres
Figure 2 — Non-circular air lock SIST EN 12110:2014

EN 12110:2014 (E) 14 The air lock shall be large enough and so designed that before decompressing a casualty it shall be possible for him to be placed on a stretcher (of at least 1,85 m length) under pressure whilst permitting an attendant to be pressurized and enter the space where the casualty is located. Thereafter it shall be possible to transfer the casualty on the stretcher through the air lock and to decompress him lying on the stretcher. It shall be possible for an attendant to accompany the casualty at all times. If the air lock is designed for a working pressure above 1 bar it shall be possible to keep the stretcher in a horizontal position during decompression. NOTE See EN 1865, Patient handling equipment used in road ambulances For personnel locks which are part of a tunnelling machine designed for a max. working pressure of not more than 1,5 bar and when no stage decompressions are required, the minimum cross sectional dimensions of Table 2 can be reduced by 0,1 m and the volume of the main chamber can be reduced to 2,0 m3 (two persons). The volume of the entrance chamber can be reduced to 1,0 m3 (one person). Signs displayed outside, at each end of such an air lock, shall state “NOT TO BE USED FOR STAGE DECOMPRESSIONS”. 5.3.3 Seats In personnel locks seats shall be provided. They shall be ergonomically designed. They shall provide firm back support and a minimum sitting width of 0,5 m and sitting depths of at least 0,4 m. Cooling of the body as a result of contact with cold surfaces (e.g. wall of the air lock) shall be avoided. For personnel locks which are part of a tunnelling machine designed for a maximum working pressure of not more than 1,5 bar and when no stage decompressions are required, seats may be omitted. 5.3.4 Door openings, dimensions Door openings of personnel locks shall have a clear body opening with a minimum dimension of 600 mm in any orientation. NOTE The minimum door dimensions of air locks are larger than the minimum dimensions of other access openings of tunnelling machines (e.g. access openings in cutter heads). 5.3.5 Doors, closure After pressure equalization, it shall be possible to open personnel lock doors from both sides. As a sudden loss of pressure from the working chamber would cause a hazard, the access openings to the working chamber shall be capable of being sealed against pressure from each direction. 5.3.6 Minimum equipment for personnel locks 5.3.6.1 General Each compartment shall be equipped with control equipment and instrumentation and penetrations. 5.3.6.2 Control equipment and instrumentation The following equipment and instrumentation shall be provided: — equipment for the primary control of pressure capable of being operated from outside the airlock; — equipment for emergency control of pressure; — a valve on the compression line inside the airlock secured against unintentional use; — an emergency decompression line with a valve on the inside secured against unintentional use and with a valve on the outside capable of being locked open; SIST EN 12110:2014

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