DUPLEX PRESSURE REDUCING SET Phoenix Pipeline Products Limited. Unit 8, McKenzie Industrial Park, Tel No.: 44 (0) 161 428 7200 Bird Hall Lane, Fax No.: 44 (0) 161 428 7010 Stockport, Email: info@p3-phoenix.com U.K., SK3 0SB www.p3-phoenix.com
Contents Page Section Page Product Description General 3 Operation General 3 Layout 3 Pressure Settings 4 Safety Installation Mechanical 4 Testing Testing & Commissioning 4 Maintenance General 5 Preventative Maintenance 5 Spare Parts General 5-2 - Duplex Pressure Reducing Set Rev. 1
1. Product Description 1.1 General Duplex Pressure Reducing Sets comprise two pressure regulators, two outlet pressure gauges, two pressure relief valves and four isolating valves all mounted on a backplate and is complete with copper pipe stubs. The unit is suitable for regulating the primary pipeline distribution pressure to a lower pressure, for example, to regulate the supply pressure from a 7 bar medical air plant to provide a 4 bar medical air supply. 2. Operation 2.1 General The Duplex Pressure Reducing Set is not automatic and must be operated manually. The unit should be kept in the following state when in use; (a) The isolation valves either side of one regulator should be open. (b) The isolation valves either side of the other regulator should be closed. In the event that the selected pressure reducing set fails or requires routine maintenance, the second pressure reducing set can be selected by manually opening and closing the relevant isolation valves. The pressure regulators and relief valves are factory set and should not need any further adjustment. Each regulator incorporates a pressure gauge indicating the supply pressure from the regulator. 2.2 Layout ID Description Qty ID Description Qty 1 Isolation Valve 4 4 Pressure Relief Valve 2 2 Outlet Pressure Gauge 2 5 Backplate 1 3 Pressure Regulator 2-3 - Duplex Pressure Reducing Set Rev. 1
2.3 Pressure Settings Component 4 Bar Outlet 7 Bar Outlet 3. Safety 3.1 General Max. Inlet Pressure 16.0 bar 16.0 bar Regulators (static) 4.0 bar 7.0 bar Pressure Relief Valve 5.5 bar 9.0 bar This equipment should be installed, operated and maintained by personnel who are suitably trained, are fully conversant with HTM 2022 and are familiar with this product. This equipment should be kept clean and be free from oil and grease at all times. Oil and grease will ignite spontaneously in the presence of oxygen. If you suspect that any equipment is contaminated, do not use it. No attempt should be made to use or modify this equipment for use with a gas other than as identified. This equipment should not be operated at pressures exceeding those stated in HTM 2022 and this manual. 4. Installation 4.1 General All regulators and relief valves are preset and no further adjustment of these settings should be required. 4.2 Mechanical (a) Secure the backplate to the wall using suitable fixings. (b) Connect the inlet and outlet stub pipes to the distribution pipeline system and braze. (c) Check and tighten all mechanical joints. (d) Pressure test the system. If testing as part of a first fix test, remove the pressure relief valves and plug the ports. 5. Testing 5.1 General Prior to testing the installation, please check the following. (a) All components have been installed and are tightened. (b) The isolation valves are closed. (c) The pressure relief valves are fitted. 5.2 Testing & Commissioning (a) Slowly open the isolation valves either side of one regulator and allow the system to pressurise. (b) Check all joints for leaks. - 4 - Duplex Pressure Reducing Set Rev. 1
(c) Observe the reading of the pressure gauge. Adjust the duty regulator if necessary. (d) To test the pressure relief valve, close the isolation valve downstream of the duty regulator and increase the pressure until the relief valve opens. Observe the pressure. (e) Isolate the duty regulator and very slowly depressurise the system the downstream distribution pipeline. Reset the duty regulator to the correct line pressure. (f) Repeat the above procedure for the standby regulator. 6. Maintenance 6.1 General Maintenance of the pressure reducing set should be restricted to periodic checking and adjustment and if necessary the replacement of faulty components. It should be noted that although many of the components appear to be standard items, many have been selected and treated to make them suitable for the gases carried and the pressures involved. 6.2 Preventative Maintenance Regular inspections and maintenance of the unit will prolong it s life and reduce the possibility of sudden, inconvenient component failures. The unit should be subjected to regular inspection and testing as detailed below. Monthly; (a) Visually inspect the unit for signs of damage. (b) Check all mechanical joints for leaks. (c) Check that the line pressure is correct. Annually; (a) Visually inspect the unit for signs of damage. (b) Check all mechanical joints for leaks. (c) Test the unit as detailed in section 5.2 to confirm correct operation. (d) Observe that all gauges are working correctly. 6.3 All maintenance should be carried out with the knowledge of the hospital engineer and in accordance with the Permit-to-Work system. 7. Spare Parts When ordering spare parts, please quote the batch number of the equipment and a description of the component required to ensure that you receive the component that you require! Due to our policy of continuous product improvement, Phoenix Pipeline Products Ltd. reserve the right to alter dimensions and/or specification without notice although every effort will be made to advise of any such modifications. Certain aspects of P³ Ltd. designs are protected. - 5 - Duplex Pressure Reducing Set Rev. 1