Process area: Project development (PD) Owner: Author: Revision no: Revision date: System: Competence: Validity area:App A Control circuits (Normative) ............................................................................................................................42 App B Optional control circuits (Informative) ...........................................................................................................43App C Applicable for valves supplied to the European Community (Normative for applicable area) .................44 C.1 Design of Equipment..............................................................................................................................44 C.2 Marking ..................................................................................................................................................44App D Applicable for valves supplied to Norway or Norwegian part of continental shelf (Normative for applicable area).................................................................................................................................................45 D.1 Design of equipment ..............................................................................................................................45App E Applicable for valves supplied to Snorre A ...................................................................................................46 E.1 Environmental data ................................................................................................................................46 E.2 Instrumentation ......................................................................................................................................46 E.3 Actuator selection...................................................................................................................................46 E.4 Actuator sizing........................................................................................................................................46 E.5 Hydraulic oil............................................................................................................................................47 E.6 Nominated manufacturers......................................................................................................................47 E.7 References.............................................................................................................................................47 E.8 Typical control circuits............................................................................................................................47App F Applicable for valves supplied to Gullfaks ....................................................................................................48 F.1 Environmental data ................................................................................................................................48 F.2 Instrumentation ......................................................................................................................................48 F.3 Mechanical requirements .......................................................................................................................49App G Applicable for valves supplied to Mongstad..................................................................................................50 G.1 Objective ................................................................................................................................................50 G.2 General requirements ............................................................................................................................50 G.3 Functional requirements – Valve operating speed.................................................................................50 G.4 Material requirements – Instrument commodity items ...........................................................................50 G.5 Instrumentation ......................................................................................................................................50 G.6 Electrical operation.................................................................................................................................51 G.7 Surface protection ..................................................................................................................................51 G.8 References.............................................................................................................................................51 G.9 Control Circuits.......................................................................................................................................52This document and its content, is for authorised company use only.The objective of this document is to define the technical requirements for actuators, control circuits and accumulators for remotely operated on/off valves.The main target group for this document is actuator and valve suppliers; however personnel and contractors involved in project development of new onshore and offshore facilities or modification of existing facilities should also be familiar with the requirements in this document.Provision is made in Management System (TR3010 Mechanical, Technical Requirements and Standards).The technical requirements contained in this specification are in addition to those defined by Purchaser in TR2000 “Piping and Valve Material Specification" and other referred standards and specifications.This specification excludes requirements for the following actuator locations:• Surface Wellhead and Christmas Tree System (TR3540).• Subsea Wellhead, Tree and Completion/Workover Equipment (TR3541).• Large Valves in Pipeline Transportation Systems (TR1236).The minimum requirements herein are still applicable for the above excluded systems if the actuated valve is given an additional safety function to its original function in the process plant.Selection of actuator type is Purchaser responsibility and is described in TR3032 Field Instrumentation. Any information applicable for purchaser’s consideration to select mode of actuation, space requirements (maintenance, material handling etc.) and the effect on weight and equipment stability shall be highlighted by supplier.Actuator suppliers shall be accepted for use according to the list of approved suppliers located in TR2000 Piping and Valve Material Specification:www.tr2000.net —> Document Space —> Valve Technology and Requirements http://www.tr2000.net/TR2000/document space/list documents.jsp?document id=57&opn=Project development (PD), Technical and professional requirements (TR), TR0038, 5.02, published 01/04/2020Supplier will be responsible for supplying equipment suitable for the above conditions.The design temperature range shall be based on the ambient temperature range defined in the design basis for the applicable project/installation/plant. Unless otherwise specified, the atmosphere shall be considered humid and corrosive.The Purchase Order (PO) shall define the selected valve design and details, as well as the functional requirements by pre-selecting the control circuit function and thereby also define the selected actuator type (single/double acting, hydraulic/pneumatic/electric).The valve supplier shall have full responsibility for the design, construction and functionality of the valve- actuator assembly including all accessories, local control circuits and accumulators. The valve supplier shall in close liaison with the actuator supplier calculate and select the most suitable actuator and control circuit capacity that will satisfy the requirements set forth in the PO’s.Actuator failure mode shall ensure the correct valve position required for the safe operating condition. Service life shall be minimum 20 years unless otherwise specified.All actuated valves shall be equipped with adjustable speed setting components. For detailed requirements reference is made to section 5.8.Typical response times that shall be complied with unless other requirements are specified: � Time from activation to start execution, e.g. de-energized solenoid valve, shall be less than 2 seconds. � PSD/ESD valve travel time (in service) at minimum operating hydraulic/pneumatic supply pressure shall not exceed 1 sec/inch (valve size), or maximum 45 seconds to reach safe state. For valves 8 inch or less, a typical travel time may be set to 8 seconds. Travelling speed when travelling from the predefined safe position shall be agreed between buyer and supplier.The PSD/ESD travel time limit for the actuator is specified taking into account possible future wear etc, and may not correlate directly with overall safety system time requirements.For valves that by size or design fail to meet the required speed, the Supplier shall notify the Purchaser about the limitations and seek alternative solutions together with the Purchaser.The actuator shall be equipped with a “maximum speed device” fitted in the actuator housing with sufficient mechanical strength to withstand breakage. There shall be no tubing between the device and the actuator piston chamber. Unless otherwise specified, the maximum speed shall be limited to 0.5 sec/inch (valve size) in case of a physical breakage of tubing connected to the actuator. The “maximum speed device” shall not influence the valve in reaching its predefined safe position on demand. For valves smaller than 4" this requirement may be discussed with Purchaser and may be waived based on a Company approved Concession Request (CR). The evaluation of such a CR shall take into account possible water hammer in liquid pipeline systems.The dimensioning of the actuator shall be valve supplier’s responsibility in close cooperation with the actuator supplier. A description of the required service application will be submitted in a Process Data Sheet (PDS). In addition, an Instrument Data Sheet (IDS) and a Valve Data Sheet (VDS) with referred attachments will be presented in the PO.Typical information provided by Purchaser will be: � Type and size of valve � Type of actuator � Line pressure � Maximum service media differential pressure � Operating temperature � Type of fluid in the line � Ambient temperature � Pneumatic/hydraulic/electric power supply � Opening/closing timesIn addition the valve supplier shall include (obtained from actuator supplier if relevant) experience data such as: � Valve stem size and packing design/compression � Valve wear and degradation � Relaxation of springs � Increase of valve torque and thrust when the valve is stationary in one position during a prolonged period of timeActuator selection and sizing shall be based on:� Maximum service media system operating conditions. When using differential pressure situations due attention shall be given to pressure combinations, such as up-stream, down-stream, pressure in valve cavity, static pressure, effects from media flow, etc. (special attention shall be given to valves with double piston effect seat design where cavity pressure can reach 133% of DP).� Hydraulic actuators shall be able to withstand the maximum supply pressure as defined in 5.2 (static). I.e. all parts of the actuator shall be able to tolerate the loads resulting from the specified pressure also in any of the end positions.� The valve and actuator drive chains shall be able to tolerate the loads generated by the nominal hydraulic or pneumatic supply pressure (dynamic) as defined in 5.2, including the safety factor as defined in 3.3.3, without exceeding 90% of the yielding capacity of any part of the drive chain.� Where the pneumatic actuator output load capacity exceeds the output required to operate the valve (including safety factor) the air filter regulator, as described in 5.5, can be set to reduce the air pressure to limit the strain on the drive chain. The filter regulator including the relief set point shall be adjusted to avoid higher stresses than 90% of the yielding capacity on any part of the drive chain. For hydraulic actuators such scenarios shall be clarified with Company and approved by Company in a CR..� If valve stem material is modified from material specified on the VDS, this shall be approved by Company in a Concession Request (CR).� The sizing of the actuator shall account for forces from a situation where the valve’s closing member is prevented from free movement during a valve stroke. The drive chain shall be able to tolerate maximum actuator output as defined in this chapter.One stroke is the movement of the valve from open position to closed position or from closed to open.This capacity shall be available in a dimensioning fire situation and as a minimum with a spring temperature up to 100 0 C.Purchaser shall be informed about any limitations on the equipment that may be relevant for each application. This can typically be an order with a remotely mounted control panel/cabinet with no reference to the distance between control panel and actuator/valve. In such case it shall be the Supplier’s responsibility to request additional information from Purchaser to ensure that the required capacity will be met. Unless otherwise specified, an average tube run distance of 15 meters shall be assumed. For dimensioning of hydraulic oil systems, a back-pressure of ten (10) bar g in the return line shall be used unless otherwise agreed between Purchaser and Supplier.Pressure reduction features shall be in accordance with ISO 12490 section 9.2.For slab gate valves of the reverse acting type, the contributing closing force from the media pressure shall not be accounted for when dimensioning actuators. Any deviation to this requirement shall be approved by Company in a CR.To account for potential future increases in frictional loads in the valve the actuator output shall be calculated with an additional safety factor.In general actuators for ESV, BDV and XV valves shall be dimensioned to provide an output with a minimum safety factor of 2.0. It is permitted that the safety factor for the travel to the non-safe position may be reduced to a minimum of 1.5 (e.g. for a spring/piston operated valve where the fail-safe travel is operated by the spring, the minimum safety factor for the piston displacement/spring charging shall be 1.5, whilst the spring movement shall maintain a minimum safety factor of 2.0).All other valve actuators shall use a minimum safety factor of 1.5.Safety factors for actuator output shall be calculated using the nominal supply pressure/voltage values as provided by the Purchaser. The safety factor shall also apply for springs through the complete valve stroke.Purchaser may, for individual valves, require a different safety factor. The Supplier might also recommend a different value based on experience at the given service conditions. This shall be approved by Company in a CR."Fail open" or "fail close" mode of spring-less double-acting piston actuators shall be accomplished by the use of accumulators and switching valves. The accumulator capacity shall normally be sized for at least three (3) strokes of valve operations within full operating temperature range (including minimum temperature), starting at nominal operating pressure as defined in 5.2.At the end of the third stroke, the remaining accumulator pressure shall not be less than the minimum operation pressure as defined in 5.2.For non-safety critical valves larger than 20", the stored power capacity may be reduced to 1.5 strokes. For this case, the accumulator gas expansions temperature drop has to be taken into consideration. Normally the pre-charge gas isothermic behaviour, at the lowest ambient temperature, has to be assumed. If the calculation shows that, after one actuator stroke, there is not sufficient power immediately availablefor another half stroke, additional gas volume has to be included. The requirement for the available 1.5 stroke power is that after a theoretical 150 % travel, with the actual accumulator piston, the minimum pressure for valve closure is still available (ref. isothermal expansion).‘Non-safety critical valves’ will be defined in the PO based on an evaluation where current authority regulations are taken into consideration.Unless otherwise specified, all equipment shall withstand humid and corrosive atmosphere. Special conditions like e.g. severe condensation, sea water, fire water spray, steam and AFFF may be specified in PO.General accessories such as nuts, bolts, indicator pins, etc., assembled in direct contact with stainless steel equipment, shall be in AISI 316 SS.For electric actuators, alternative use of aluminium material grades may be accepted if the aluminium grade(s) is documented as a corrosion resistant material grade in marine and saline atmosphere. If any aluminium grade is used, a proper specification shall be established as described in section 11.3.6.All welding shall be continuous and welding of stressed components shall be full penetration welds. When welding is applied onto components specified as 316 SS material, the material grade shall be AISI 316L.The Manufacturing Records represents the Supplier’s computer system / reference to calculations together with the necessary drawings, manufacturing, testing and inspection procedures, certifications, and non-conformance reports required to demonstrate that the product (actuator / accumulators / control circuit as applicable) is in compliance with all specified requirements.The Manufacturing Records shall include: material certificates, relevant welding procedure specification and qualification, repair weld maps, NDE reports together with lists of welder and NDE operator qualifications and NDE procedures. Relevant fabrication drawings and sketches must be included to facilitate the understanding of welding, heat treatment and NDE records. There shall be traceability from the applicable item to all documents in the Manufacturing Records.Manufacturing Records shall be stored for at least 10 years following the commencement of the guarantee period. Supplier shall be able to provide information in the Manufacturing Records, as defined above, when required by Company. On written request, Manufacturing Records documentation shall be provided within 15 working days.Supplier is obliged to: � offer the Manufacturing Record documentation free of charge to Purchaser � submit the Manufacturing Record documentation to Purchaser if for any reason the Supplier ceases to operate � notify Company prior to destruction of any manufacturing records4.6 Instrument commodity items Table 3 – Material requirements for commodity itemsNote : Duplex SS means UNS S31803/UNS S32205 or equivalent grades.Accumulators: AISI 316 SS or carbon steel Nitrogen bottles: According to BS 5045, Part 7 Air reservoirs: AISI 316 SS or carbon steelFramework for control circuits, Control circuit plate (min. 3 mm thickness), Protection shield along control circuit top, Cabinets for control circuits and Junction boxes: AISI 316L SS.Soft seal material shall be suitable for the specified service conditions. O-rings shall be according to MDS PG301.All equipment shall comply with the requirements of the specific hazardous area in which they will be installed.The equipment shall be certified for Zone 1, Gas Group IIA, and temperature class T3 as a minimum unless specified otherwise by Purchaser in PO.Preferred protection methods are Ex (e), Ex (i), and Ex (m) in accordance with IEC 60079. For field instruments like limit switches Ex (i) shall be used in maximum extent possible. For junction boxes and glands Ex (e) shall be used in maximum extent possible. For solenoid valves Ex (m) shall be used in maximum extent possible.The minimum degree of protection provided by enclosures shall be IP 56 in accordance with IEC 60529.Pneumatic/control valve solenoid coils shall be with completely encapsulated coil, screw terminals within terminal box and cable connection to be ISO metric, pitch 1.5 mm.Air supply Unless otherwise specified by Purchaser the on/off valve application shall be designed and sized for the following: � Minimum operating pressure: 5,5 bar g � Nominal supply pressure: 7 bar g � Maximum supply pressure: 12 bar gHydraulic supply Unless otherwise specified by Purchaser, the hydraulic actuators, control systems and accumulators shall be designed and sized for: � Minimum operating pressure: 160 bar g � Nominal supply pressure: 200 bar g � Maximum supply pressure: 210 bar gElectrical supply Purchaser shall specify the type of power supply for field instruments and electric actuators, including voltage, AC/DC, phase and frequency: � Voltage tolerances: +/- 10% � Frequency tolerances: +/- 5%� CPM level 1: Simple measurement of valve operation time � CPM level 2: Valves with electrical actuator or positioner with built-in measurement of response time, operating time and power consumption � CPM level 3: Same as for CPM level 2, but in addition with valve force and valve leakage measurements5.3 Signal types The following signal types shall be the preferred choice for electrically hardwired field devices:Based upon request and input given by Purchaser, the assets shown in table 5 are required as part of the valve/actuator assembly in order to facilitate valve condition and performance monitoring (CPM). Purchaser shall provide the required CPM level for specific actuator tags and other necessary information in the PO.5.5 Air filter regulator Air filter regulators shall be provided with integral relief valve and micron filter.Limit switches shall for European locations be of inductive type with NAMUR interface according to IEC60947-5-6, for other locations be in accordance with PO requirements.When limit switches are specified they should be fitted inside a combined switch house/junction box, complete with terminals. This should be mounted to the actuator or valve body for termination of flying leads according to section 5.7.5. The limit switches shall be installed on rigid AISI 316 SS steel fixing plates or brackets and shall be easily adjustable.Flying leads from limit switch to junction box shall be physically protected by the design. If no other options are possible 316 SST tubing shall be used.The limit switches shall be activated by the movement of the valve shaft or stem and shall switch at less than 5% of the movement of the respective limit.The technical design and arrangement of all equipment shall carefully consider the following: � Wear resistance � Protection against damage � Protection against vibration � Operability and serviceabilityThe installation shall be done by skilled personnel who have participated in the applicable fitting manufacturer's training course or general tubing and compression fittings training course before they are allowed to work with tubing and compression fittings. A successful performance of the course shall be documented by a qualification certificate, which shall be accessible on request.The make and type of fittings will be specified in the PO. Instrument ball valves shall only be used for on/off operation.Fire resistant, braided flexible hose connection between the tube and the actuator final fitting may be considered when there is risk of high vibration and shall be approved by Company.Any loose items shall be put in a small plastic bag and fastened with ”strips” onto the equipment close to the applicable mounting position.5.7.2.2 Hydraulic & Nitrogen services For hydraulic applications, and N 2 services for hydraulics, compression tube fittings shall be used.Threads for electrical glands shall be ISO metric; pitch 1.5 mm. Heat shrinking sleeves covering glands shall not be used. Glands of GRP shall not be used.Threaded end fittings (without adapters) shall be to ISO 1179-2 with BSPP threads to ISO 228-1, sealing surface to DIN 3852, form A, utilising a bonded seal packing in 316 SS/PTFE or 316 SS/NBR (Explosive decompression proof if used in Nitrogen service).All interface tube fittings shall be included in the equipment units and shall be plugged with suitable AISI 316 SS caps prior to shipment.All parts of the assembly shall be thoroughly cleaned by mechanical means before any washing or flushing is attempted. All tube ends, ports in solenoids etc. shall be de-burred on the outside and inside and blown through with air before assembly.5.7.2.3 Pneumatic service For pneumatic systems NPT threaded connections (ASME B1.20.1 or B1.20.2M) shall be used.All interface tube fittings shall be included in the equipment units and shall be plugged with suitable AISI 316 SS caps prior to shipment.On NPT-threaded compression fitting, the sealing compound for process services and instrument air services shall be recommended by purchaser. The use of PTFE tape can be used upon Company acceptance.The actuator interface to the valves shall preferably be standardised accepting different valve sizes according to ISO 5210 or ISO 5211. Actuators, adapters, connections and valves must be sufficiently strong and rigid to comply with the requirements in section 7.Rotary type actuators shall use dowel pins or key for securing fixed position between actuator and valve.Cable installation, termination and earthing shall comply with statutory regulations and applicable specifications (ref. TR3023 Electrical, instrument and telecommunication installations, offshore units and TR3024 Electrical, instrument and telecommunication installations, onshore plants).Junction boxes shall be complete with terminals suitable for 2.5 mm 2 cross section copper conductors, mounting rails, endplates etc. and with suitable earth continuity plate for the cable glands and thus the cable armouring/lead sheathing where applicable.All cable entries shall preferably be in the bottom of the junction box. If this is not practical the sides can be used, if approved by Company. No cable entries are permitted at the top of the junction box. Unused penetrations shall be carefully plugged before shipment.The actuator control circuit represents the interface between different control/safety computer systems and the on/off valve. Schematic control circuits for hydraulic/pneumatic actuated valves are shown in App A and App B. Control panels for the different circuit types shall be standardised in size, layout and mounting arrangement.Valve control panels for on/off valves should be of “compact” type, avoiding internal tubing and fittings. All accessories required for control of the actuator movement, such as hydraulic inlet filter, solenoid valves, manual valves, pressure gauges etc. shall be mounted on a control panel.Hydraulic oil inlet and outlet ports shall be clearly marked "Oil Inlet" and "Oil Outlet", both on control panel and actuator. Isolation valves for supply and return lines shall be installed as close to the instrument as possible.Hydraulic filter units to be used shall have a differential pressure indication without an automatic bypass function.Pressure gauges shall indicate the internal pressure in the control unit.Devices for control of the speed in both directions shall be installed on the control unit as an integrated part. It shall not be possible to fully close the restrictors. The restrictors shall be easy to adjust during operation and shall include feasibility to car seal in any adjusted position.Unless otherwise specified, a check valve shall be included in hydraulic circuit supply lines and pneumatic supply lines. For hydraulically operated valves this check valve will cause a trapped-in liquid volume in the actuator/control circuit. In case there will be a temperature rise in this liquid volume (due to external heat input) the pressure may exceed allowable limits. To avoid this, a combined check/pressure relief valve should be included. Alternatively, a small volume nitrogen accumulator (nitrogen cushion separated from the oil by a diaphragm) can be used.Unless otherwise specified, accumulators and their protection devices shall be assembled as a part of the control circuit panel, to form a composite unit. If specified by Company they may also be required as independent units, depending on the space available. The vent outlets from bursting discs must be guided to a safe location.Quick dump functionality may be considered when relevant to achieve necessary functional requirements, e.g. fast operating time. Such functionality involves assisting the control medium to be evacuated faster,typically during fail-safe operation, and should be assessed in conjunction with the requirements for spring housing in section 7 as applicable.5.8.2.6 Local reset function All ESV actuators shall have a local mechanical or electrical reset function.Control circuits shall, unless otherwise specified, be fitted onto free-standing support structures or other fixed structures, i.e., with due attention made to conditions such as free line of sight to valve/actuator and vulnerability during major incidents (fire/explosion) and falling objects.Control circuits that are fitted directly onto actuators shall only be selected when access and maintenance restrictions have been evaluated and concluded (by PO).All mounting plates shall be protected by a shield along the top that completely covers all the control circuit components.Nuts / bolts used for fastening components in the panel with fastening on the rear side of the panel shall be fixed to the mounting plate and not drop off the rear during removal of individual components for repair and maintenance.Control circuits shall be mounted onto a plate (min. 3 mm thickness) supported by angle framework. All plate edges shall be rounded off to a minimum radius of 2 mm.Control circuits for ESV valves and valves installed in saliferious atmospheres shall be mounted inside a cabinet with a quick-lock hinged door with door stop. The width of the door shall not exceed 800 mm. Drain plug(s) shall be provided in the cabinet base and plastic components shall not be used. When mounted directly onto valve/actuator it shall be prepared for subsequent fire insulation by others.Each actuator shall have an individual performance test certificate stating the following recorded parameters: Maximum torque, maximum torque current, flash test voltage, output speed or operating time. The certificate shall also provide details of gear ratios and closing direction.On/off valves with electrical actuators shall have the possibility for serial communication.The electric motor shall be Class F insulated and rated for duty at an ambient temperature of + 40 deg C or specified maximum ambient, whichever is the highest, for a minimum of 15 minutes or twice the valve stroking time, whichever is the longest, and with an average load of 33 % of the maximum valve torque.Electric motors shall be in accordance with the requirements in TR3122 Three phase cage induction motors, sections 2.1, 2.2, 3.3, and 3.5.2. Local electrically by selecting local mode and operating pushbuttons on the actuator.6.2.2 Testing Testing of electric motors shall be performed in accordance with TR3122 section 5.2.Torque shall at least be adjustable between the range 50% and 100% of rated torque. A torque sensing system shall allow sufficient torque during unseating and mid travel restarting. The number of turns shall be adjustable to suit the application.The actuator shall have the possibility for the following modes of operation:1. Remote electrically by signalling the actuator from the control system.3. Local mechanically by releasing the electric motor via clutch and moving the actuator by a standard hand wheel installed on the gear.The actuator shall have the following remote control modes with individual signal for each mode:� Open and closed position indication. Contacts shall be voltage free and possible to configure for Normally Open (NO) and Normally Closed (NC) mode.6.6 Handwheels Where handwheels are specified, they shall conform to the following:� May be integral or attached by bolts or clamps � Shall be of locking type with de-clutchable handwheel � Engagement / disengagement shall be clearly indicated.The valve/actuator assembly shall be designed to avoid high component stresses, instability between valve and actuator, high deflections or other operational problems. The actuator shall be supported by the valve. Supporting shall not be by adjoining pipe or other external structures unless this is agreed between purchaser and supplier and included in the PO.Junction- and limit-switch boxes, limit switches, position indicators and other ancillaries connected to actuators, adapters and accumulators shall use rugged and solid methods for attachment.When the valve/actuator will be installed oriented horizontally the stem deflection shall be considered in the design and shall not be larger than 2% of the stem diameter, measured at the stem-coupling. Any spot check verification is to be agreed between purchaser and supplier and included in the PO.All valve assemblies including the control circuits may be specified to withstand explosion loads and earthquake loads. Purchasers shall in the PO identify explosion load requirement by providing a Design Accidental Load Specification that will identify blast loads for the various areas of a plant.Flexible hoses may be used subject to Company approval. Alternatively, hard tube shall be installed to allow safe operation due to relative movements of the actuator/accumulator during an explosion.The actuator shall be provided with a local indicator showing the valve position at all times. Where fire protection shield is applicable, valve position shall be visible outside such protection. When a mechanical device/indicator is fitted, the Open and Closed position indication shall be permanent/engraved.All components that will require adjustments (e.g. piston end-stops, limit switches) shall use threaded components for adjustment and locking.Yoke and gear housings shall be completely weather proof. They shall be pre-lubricated for expected life and oil filled housings shall be filled to submerge all moving parts.Whenever rotary or linear shafts enter into a closed compartment (e.g. piston rods, limit switch shafts) weather seals (lip-seal, O-ring) shall be fitted as flush as possible with the external surface. This is to avoid entry of water and dirt.The following alternative codes may be used if accepted by Company by CR: � PD 5500 Unfired Fusion Welded Pressure Vessels � ASME Boiler & Pressure Vessel Code, Section VIII, Division 1 or 2The equipment shall be designed so that water does not accumulate in pockets/depressions on the exterior, and is not trapped inside low-point volumes internally, causing corrosion. Drain facilities shall be included if this is not possible to avoid.Spring housings and unpressurized parts of the piston cylinders shall be of closed design and not exposed to atmosphere internally. This can be achieved by sealing the housing or e.g. connecting to instrument air.External tie-rods on cylinders and spring cartridges shall be arranged such that there will be a minimum distance between tie-rod and cylinder wall to enable adequate access for painting. The minimum distance shall be 3.5 mm for tie rods with a diameter smaller than 10mm and 5mm for tie rods with a diameter larger than 10mm.The actuator shall be fitted with end stops that shall be adjusted so no damage is inflicted on the valve when it reaches its end stops.The specified design code shall be complied with fully, in addition to the requirements stated in regional requirements for applicable location.Design, fabrication, inspection and testing of hydraulic and pneumatic accumulators (air reservoirs) and actuator cylinders shall be in accordance with EN 13445 and EN 14359.Description of actuator part Material selection/design requirements Valve actuator cylinder: Nodular cast iron/Carbon steel/AISI 316 SS Actuator yoke housing: Nodular cast iron/Carbon steel/AISI 316 SS Actuator end covers: Nodular cast iron/Carbon steel/AISI 316 SS Act. yoke fork, rack & pinion: Nodular cast iron/Carbon steel/AISI 316 SS Actuator spring housing: Nodular cast iron/Carbon steel/AISI 316 SS SS 316 or min. 13% Cr 4% Ni stainless steel. Piston rods and shafts exposed to atmosphere: AISI 316 SS, Duplex SS or in material with equal or better corrosion resistance. External tie rods, nuts and bolts with dia. ≤10 mm, stroke adjustment components and washers: External nuts and bolts dia. larger than 10 mm: Hot-dipped galvanized carbon steel to ASTM A153, AISI 316 SS, or Duplex SS or a material with equal or better corrosion resistance. Adapter stool (connector between actuator and valve): AISI 316 SS, Duplex SS or in material with equal or better corrosion resistance. Adapter stool in carbon steel are acceptable with the following requirements: o The adaptor stool shall be galvanized and painted. o Machining is acceptable on flange faces towards actuator and valve after galvanizing. o Machined surfaces shall as a minimum be painted. o It is acceptable to drill and thread holes after galvanizing. o The flange faces between actuator and valve shall be preserved with rust and corrosion preventive product like e.g. a black bituminous spray during assembly to preserve potential paint damages coming from assembling or operational movement between the parts SS 316 or min. 13% Cr 4% Ni stainless steel. Coupling (connection between valve and actuator shafts): Actuator/valve connection bolts: Carbon steel according to ASTM A193 B7/2H, hot dip galvanised to ASTM A153, or material with better corrosion resistance. AISI 316 SS Brackets for limit switches, junction boxes and other ancillaries, support structures between actuator and valve: Grease nipples: AISI 316 SS Hand wheel for manual override Hand wheels and handles shall be in stainless steel (minimum SS304/316) or hot dip galvanized carbon steel according to ISO 1461. Hand wheels or handles galvanized according to ISO 1461 shall be painted in accordance with requirements in section 10. Hand wheels made from machine pressed tin is not permitted.Item External and saliferious atmosphere Indoor and dry atmosphere or external non-saliferious atmosphere Material MDS Material MDS Air filter regulators: AISI 316 SS Instrument fittings: AISI 316 SS SF312 6Mo 25Cr Duplex Alloy C-276 SF712 DF212 NF608 Instrument manifolds: AISI 316 SS Instrument valves: AISI 316 SS Rupture discs: AISI 316 SS Small relief valves: AISI 316 SS Tubing: AISI 316 SS ST301 6Mo 25Cr Duplex Alloy C-276 ST701 DT201 NT603 Pressure indicators: AISI 316 SS Booster: AISI 316 SSDescription of tagged instrument part Material selection/design requirements AISI 316 SS Hydraulic solenoid/control valve body & coil housing: Pneumatic solenoid/control valve housing: AISI 316 SS Pneumatic solenoid/control valve solenoid coils: Glass-fibre reinforced plastic housing/ AISI 316 SS Limit switches and position transmitters: AISI 316 SS AISI 316 SS Accumulator piston position indicator (if mechanical): Valve position indicator: AISI 316 SS/plasticCondition monitoring functions Travel Time detection Valve leakage Response time Partial stroke test Diagnosis Instrument (torque/force) Valve power need Actuator power use Operation Time Total Valve/Actuator Assets monitoring (CPM) levels Valve condition and performance Automatic Manual or Recording Sensor/ Positioner Limit Switches/ Actuator Power Built-in function Built-in function Leakage Sensors 1 x N/A N/A N/A N/A N/A 2 N/A x x x N/A N/A 3 N/A x x x x xSignal Type Analogue input 4 – 20 mA with HART protocol Analogue output 4 – 20 mA with HART protocol Digital input Potential free contact Proximity switches with NAMUR interface according to IEC60947-5-6 Digital output 24 VDC