Spirax-Sarco Engineering plc announces the acquisition of Gestra AG and associated businesses for €186 million. Gestra is a technology leader in advanced industrial boiler control systems and specialises in the design and production of valves and control systems for steam and fluid process control. 2.1 Introduction The EP5 is a 2 wire loop powered positioner requiring a 4-20 mA control signal, and is designed for use with linear pneumatic valve actuators. The positioner compares the electrical signal from a controller with the actual valve position and varies a pneumatic output signal to the actuator accordingly.
IM-P343-16 CH Issue 31 EP5 and ISP5 Series Electropneumatic Positioners Installation and Maintenance Instructions IM-P343-16CH Issue 3 3438952/3 1. Safety information 2. Introduction 3.
Safety information Referring to the Installation and Maintenance Instructions, name-plate and Technical Information Sheet, check that the product is suitable for the intended use/application. The products comply with the requirements of the European 1.1 Intended use Pressure Equipment Directive 97/23/EC and fall within the category 'SEP'. It should be noted that products within this category are required by the Directive not to carry the mark.
I) The products have been specifically designed for use on compressed air, which is in Group 2 of the above mentioned Pressure Equipment Directive. The Sarco should be contacted to confirm the suitability of the product for the products’ use on other fluids may be possible but, if this is contemplated, Spirax application being considered. Those of the system in which it is being fitted, or if malfunction of the product i) Check material suitability, pressure and temperature and their maximum and minimum values.
If the maximum operating limits of the product are lower than could result in a dangerous overpressure or overtemperature occurrence, ensure a safety device is included in the system to prevent such over-limit situations. Iv) Spirax Sarco products are not intended to withstand external stresses that may i) Determine the correct installation situation and direction of fluid flow. Be induced by any system to which they are fitted. It is the responsibility of the installer to consider these stresses and take adequate precautions to minimise them. V) Remove protection covers from all connections and protective film from all name-plates, where appropriate, before installation on steam or other high temperature applications. Ensure safe access and if necessary a safe working platform (suitably guarded) 1.2 Access before attempting to work on the product. Arrange suitable lifting gear if required.
1.3 Lighting Ensure adequate lighting, particularly where detailed or intricate work is required. 1.4 Hazardous liquids or gases in the pipeline Consider what is in the pipeline or what may have been in the pipeline at some previous time. Consider: flammable materials, substances hazardous to health, extremes of temperature. 1.5 Hazardous environment around the product Consider: explosion risk areas, lack of oxygen (e.g. Tanks, pits), dangerous gases, extremes of temperature, hot surfaces, fire hazard (e.g. During welding), excessive noise, moving machinery.
Safe operation of these products can only be guaranteed if they are properly installed, commissioned, used and maintained by qualified personnel (see Section 1.1) in compliance with the operating instructions. General installation and safety instructions for pipeline and plant construction, as well as the proper use of tools and safety equipment must also be complied with. IM-P343-16 CH Issue 34 1.6 The system Consider the effect on the complete system of the work proposed. Will any proposed action (e.g. Closing isolation valves, electrical isolation) put any other part of the system or any personnel at risk? Dangers might include isolation of vents or protective devices or the rendering ineffective of controls or alarms. Ensure isolation valves are turned on and off in a gradual way to avoid system shocks.
1.7 Pressure systems Ensure that any pressure is isolated and safely vented to atmospheric pressure. Consider double isolation (double block and bleed) and the locking or labelling of closed valves. Do not assume that the system has depressurised even when the pressure gauge indicates zero. 1.8 Temperature Allow time for temperature to normalise after isolation to avoid danger of burns.
1.9 Tools and consumables Before starting work ensure that you have suitable tools and/or consumables available. Use only genuine Spirax Sarco replacement parts. To protect against the hazards of, for example, chemicals, high/low temperature, 1.10 Protective clothing Consider whether you and/or others in the vicinity require any protective clothing radiation, noise, falling objects, and dangers to eyes and face. 1.1 Permits to work All work must be carried out or be supervised by a suitably competent person. Installation and operating personnel should be trained in the correct use of the product according to the Installation and Maintenance Instructions. Where a formal 'permit to work' system is in force it must be complied with.
Where there is no such system, it is recommended that a responsible person should know what work is going on and, where necessary, arrange to have an assistant whose primary responsibility is safety. Post 'warning notices' if necessary. 1.12 Handling Manual handling of large and/or heavy products may present a risk of injury. Lifting, pushing, pulling, carrying or supporting a load by bodily force can cause injury particularly to the back. You are advised to assess the risks taking into account the task, the individual, the load and the working environment and use the appropriate handling method depending on the circumstances of the work being done. IM-P343-16 CH Issue 35 1.13 Residual hazards In normal use the external surface of the product may be very hot.
If used at the maximum permitted operating conditions the surface temperature of some products may reach temperatures of 90°C (194°F). Many products are not self-draining. Take due care when dismantling or removing the product from an installation (refer to 'Maintenance instructions'). Provision must be made to protect products which are not self-draining against 1.14 Freezing frost damage in environments where they may be exposed to temperatures below freezing point.
Unless otherwise stated in the Installation and Maintenance Instructions, this product is recyclable and no ecological hazard is anticipated with its disposal 1.15 Disposal providing due care is taken. Customers and stockists are reminded that under EC Health, Safety and residues or mechanical damage which may present a health, safety or 1.16 Returning products Environment Law, when returning products to Spirax Sarco they must provide information on any hazards and the precautions to be taken due to contamination environmental risk. This information must be provided in writing including Health and Safety data sheets relating to any substances identified as hazardous or potentially hazardous. IM-P343-16 CH Issue 36 65 U1 U2 2.
Introduction 2.1 Introduction The EP5 is a 2 wire loop powered positioner requiring a 4-20 mA control signal, and is designed for use with linear pneumatic valve actuators. The positioner compares the electrical signal from a controller with the actual valve position and varies a pneumatic output signal to the actuator accordingly. The desired valve position is therefore maintained for any control signal and the effects of varying differential pressure, stem friction and hysterisis are overcome.
A mounting kit is supplied to suit all NAMUR standard columns or yokes. Note: A 0-10 Vdc input signal and an intrinsically safe version ISP5 are also available. 2.2 Operating principle The EP5 operates on a force balance principle by means of a nozzle/flapper mechanism and a feedback spring (refer to Figure 1).
The electrical control signal (A) is converted into a proportional air pressure (I). This pressure is applied to the flapper (5) via the receiver (1), causing a deflection of the flapper relative to the nozzles U1/U2. From the air supply (S) a reduced bleed of air is fed to the amplifier relay (2) and into one of the nozzles U1/U2. As the flapper moves the pressure drop through the nozzle is sensed by the amplifier relay. The amplifier relay outputs a signal (O) to the actuator which is proportional to the pressure drop through the nozzle. As the actuator moves, connecting lever (8) causes a change in tension of the reaction spring (6). This tension is applied to the flapper causing it to move to a new position at which the forces applied by the spring and the applied pressure (I) balance.
Important: This instrument bleeds air in normal operation at a rate of approximately 0.7 N m³/hour at a supply pressure of 6 bar. 1 1 = Receiver 0.2 to 1 bar (3 to 15 psi) 2 = Amplifier relay 3 = Adjustable orifice: sensitivity setting 4 = Damping: outlet air flow adjustment 5 = Flapper 6 = Reaction spring 7 = Zero screw 8 = Positioner lever 9 = Lock-nut 10 = Slider 1 = Sector lever A = Control signal I = I/P converter output S = Air supply O = Positioner output U1 = Increase action nozzle U2 = Decrease action nozzle IM-P343-16 CH Issue 37 3. Installation Note: Before starting any installation observe the 'Safety information' in Section 1.
This publication is provided as a guide and it is recommended that it is read thoroughly prior to installation. Also refer to the separate Installation and Maintenance Instructions for the control valve and actuator. 3.1 Location The positioner should be mounted in sufficient space to allow removal of the cover and provide access to connections. When fitting to an actuator, ensure the positioner will not be exposed to an ambient temperature outside the range -15°C to +65°C. The positioner enclosure is rated to IP54 see BS EN 60534-6-1 1998.
Connection of air supply pressure (1.4 to 6 bar g) and control signal (4-20 mA or 0-10 Vdc) should be considered prior to choice of location. 3.2 Mounting the positioner onto the actuator The EP5 positioner may have been supplied already factory fitted onto the valve actuator. However, using the mounting kit provided it can be attached retrospectively onto any other type of valve and actuator conforming to NAMUR standards.