5to: 4-600, 1000, 1200 psi. User s Guide. Phoenix Vessel Technology Limited. End port pressure vessels Model numbers: 1386, 1384, 1703, 1707.

Transcription

1 User s Guide 5to: Phoenix Vessel Technology Limited 4-600, 1000, 1200 psi End port pressure vessels Model numbers: 1386, 1384, 1703, Phoenix Vessel Technology Limited Unit 2, The Old Bakery, Lower Tuffley Lane, Gloucester GL2 5DP T: +44 (0) F: +44 (0) E: info@phoenixvessel.co.uk

2 TABLE OF CONTENTS Page No: FORWARD SECTION 1 Maintenance Guide 1.1 Removing End Cap from Vessel 1.2 Disassembling End Cap 1.3 Rebuilding End Cap 1.4 Loading Membranes 1.5 Closing Vessel SECTION 2 Installation 2.1 Handling 2.2 Vessel Support Position 2.3 Mounting and Connecting to Vessels SECTION 3 Operation 3.1 Corrosion 3.2 Operating Conditions 3.3 Safety Precautions SECTION 4 Appendix 4.1 Spare Parts List 4.2 Assembly Drawing psi. 4.3 Assembly Drawing psi. 4.4 Assembly Drawing psi. 4.5 Assembly Drawing psi of 24

3 FORWARD Phoenix Vessel Technology is a major manufacturer of Glass Reinforced Plastic Pressure Vessels which are used as housings for reverse osmosis membrane elements. It is one of a small number of companies with Code X accreditation of the American Society of Mechanical Engineers. Vessels are produced to cover a range of pressures upto 1200 psi and to house seven 40" or five 60" membrane elements. Each vessel has a documented history in terms of the manufacturing process and the materials used. Before despatch, each vessel is tested to 1.1 times working pressure to ensure structural integrity. This User`s Guide applies to a range of 4 end ported pressure vessels which have a 1.5 Victaulic feed concentrate port and 1 BSPP female product tube connection. The design of the end cap enables full pressure to be applied to the product connections (provided pipework external of the vessel has the required rating). The following Assembly Drawings are applicable: 1MNC psi 113 o F (45 o C) 1MNC psi 113 o F (45 o C) 1MNC psi 113 o F (45 o C) 1MNC psi 113 o F (45 o C) User s Guide History: Issue 1 Sep of 24

4 SECTION ONE MAINTENANCE GUIDE 1.1 REMOVING END CAP FROM VESSEL Ensure system is NOT pressurised before starting work. Check temperature of vessel contents is not greater than 45 C ( 113F ) before attempting to remove end cap (this is because there may be interference between the vessel and end cap making removal difficult above this temperature) Remove couplings connecting vessel ports to manifolds and move them clear of the vessel. Remove connections if fitted from the central product port Using a 6mm hexagonal T bar or Allen key remove the 2 caphead screws located in the backing plate Remove the 3 segment retaining ring. Each segment has a slot at one end to enable it to be levered out. If removal is difficult then start at the point where the gap between two segments is greatest. 4 of 24

5 1.1.5 Grasp the feed/concentrate port and remove the end cap with a gentle rocking motion. 5 of 24

6 1.2 DISASSEMBLING END CAP With the end fitting extracted. Unscrew the backnut located on the product port and pull the feed port and backing plate from the end plate Push the feed concentrate port forward so that the split retaining ring falls out. 6 of 24

7 1.2.3 The product port and hub may be removed from the end plate. To remove the product port grip it firmly using a small pipe strap wrench or if it is to be replaced then place it in a vice (this will damage its external thread) and unscrew the end plate. Using soft Jaws The hub to backing plate joint should not be broken. However if there is evidence of leakage of feed water into the product line then the hub may be removed from the end plate by using a 15mm drift and hammer. 1 element option 2 to 6 elements. 7 of 24

8 1.3 REBUILDING END CAP Thoroughly clean all parts and check for the following. (a) O-SEALS - cracked, worn or cut areas. (b) FEED CONCENTRATE PORT - bent or distorted. (c) BACKING PLATE - dented, or corroded. (d) SPLIT RETAINING RING - bent, distorted or corroded. (e) SEGMENTED RETAINING RING - bent, distorted or corroded. (f) CAP HEAD SCREWS - bent, threads damaged or corroded. (g) PRODUCT TUBE - threads damaged or sealing area scratched. (h) END PLATE - cracks or scratches in sealing areas. (i) ADAPTOR - cracks or scratches in sealing areas. (j) BACKNUT - thread damaged or nut split. Components which show any of the above should be replaced. Components which show any of the above should be replaced CORROSION - Examine metal components for evidence of corrosion which might affect structural performance. Particularly pay attention to the segmented retaining ring set. The backing plate may be cleaned using fine grade waterproof silicone carbide paper (600 grade or finer). Components which cannot be restored to the `as new condition should be replaced. NOTE : It is recommended that O-seals are replaced every time the end cap is rebuilt. 8 of 24

9 1.3.3 Push the feed concentrate port through the off centre hole in the backing plate. Fit the split retaining ring and pull the feed concentrate port so that this ring is located in the counterbore of the backing plate If the hub was removed earlier then lubricate the hub O-seals with glycerine and push it into the end plate. It will help if the hub is twisted as it is pushed in. 1 element option 2 to 6 elements If the hub was removed earlier then lubricate the hub O-seals with glycerine and push it into the end plate. It will help if the hub is twisted as it is pushed in. 9 of 24

10 1.3.6 Assemble the endplate with its O-seals Fit the end plate to the pre-assembled feed port, backing plate and retaining rings until it contacts the backing plate. Secure the components by screwing the backnut onto the external thread of the product tube. Do not exceed 6Nm torque. 10 of 24

11 LOADING MEMBRANE ELEMENTS This Section is provided as a Guide only, reference should be made to the element manufacturers recommendations for loading UNLOADING (a) Ensure system is NOT pressurised before starting work. (b) Remove both end caps from vessel. (c) Remove thrust ring and adaptors from vessel. (d) Remove element from vessel following element manufacturers recommendations CHECKS BEFORE LOADING (a) Check the inside of the vessel for debris which may scratch the vessel. Remove any that is found by flushing with water or by using a clean cloth. Stubborn debris which adheres to the vessel may be removed by lightly polishing the area with waterproof silicone carbide paper. Use 400 Grade (fine) to start with and finish with 600 Grade (very fine). It will help to moisten the grit paper with water during use. Avoid continuously rubbing the same spot in the same direction. Afterwards remove any debris with water or by using a clean cloth. (b) Check that there are no sharp edges to the membrane element which could scratch the vessel. Contact the element manufacturer if these cannot be easily removed. (c) Check the element brine seal for wear and or cuts. Consult the element manufacturer for spares and advice. NOTE : Sharp debris may scratch vessel bore. This should be removed before unloading elements. NOTE : Fine grade Scotchbrite may be substituted for waterproof silicone carbide paper. 11 of 24

12 LOADING (a) Lubricate the inside of the vessel with glycerine. If this is not available then flood vessel with clean water. (b) Check with the element manufacturer concerning the position of the brine seal. Normally this is placed on the upstream end of the element with the recessed part of the seal pointing upstre am. (c) Push the elements into the vessel from the upstream end. It is preferable not to apply the load to the core tube as this may result in it pushing through the element (by 3 to 4mm) and so resulting in unequal length of spigot available for sealing. On systems 4-6 element in length this becomes particularly important as the insertion load increases. It may even result in rapid loss of water quality if disconnection occurs. (d) As each element is loaded insert the interconnector. To ease insertion glycerine should be applied to the O-seals. (e) Care should be taken to ensure that the weight of the element is not taken on the interconnectors during loading. (f) The final element should be inserted the following distances in from the end of the vessel /1000 psi (length 1A) 3.8 (96 mm) 600/1000 psi (length 2-6) 5.5 (139mm) INSERTION DISTANCE (g) Adaptors (2-6 element vessels) should be removed before loading elements. 12 of 24

13 1.5 CLOSING VESSEL Check the inside of the vessel for debris which may scratch the vessel. Remove any that is found by flushing with water or by using a clean cloth. Stubborn debris which adheres to the vessel may be removed by lightly polishing the area with waterproof silicone carbide paper. Use 400 Grade (fine) to start with and finish with 600 Grade (very fine). It will help to moisten the grit paper with water during use. Avoid continiously rubbing the same spot in the same direction. Afterwards remove any debris with water or by using a clean cloth Lubricate the vessel inside surfaces with glycerine Lubricate the assembled end cap with glycerine, particularly the large 8 diameter O-seal Insert the end cap squarely into the vessel body sufficient to allow the segmented retaining rings to be inserted fully into the groove in the end of the vessel. If the end fitting is difficult to push into the vessel then use the wooden shaft of a hammer to tap it into position. NOTE : Fine grade Scotchbrite may be substituted for waterproof silicone carbide paper. NOTE : Do not use excessive force to insert the end cap. A light tap is sufficient. 13 of 24

14 1.5.5 If the end cap cannot be easily inserted then the following checks should be carried out. (i) Lubricate vessel surfaces with more glycerine and try again. (ii) The elements may have been pushed too far, proceed as follows: Remove large 4 diameter seal from end cap. (iii) Without the large O seal no effort should be required to insert the end cap, if there is still insufficient space to insert the retaining rings then the elements have been pushed too far during loading. Remove the last element by pushing it through the vessel taking care to support its weight as it emerges. Refer to Section 1..4 `Loading Membrane Elements for further information With the end fitting in place insert the three segmented retaining rings and fix in position with the two caphead screws. Tighten the caphead screws (max. torque 10Nm). 8NM TORQUE NOTE: Remember to refit all O-Seals,Thrust Ring and insert Adaptors into the central core tube of the first and last element in the stack. NOTE: A partially or badly assembled pressure vessel is dangerous. Carry out visual inspection on vessel to check compliance with these instructions. Check working area for any items left unassembled. 14 of 24

15 SECTION TWO INSTALLATION 2.1 HANDLING Vessels may be stored horizontally in any warehouse where the temperatures are as follows: Maximum 120 o F (49 o C) Minimum 32 o F ( 0 o C) DO NOT subject the vessel to sharp blows or impacts as this may damage the vessel wall DO NOT use the ports which project beyond the vessel as lifting or manoeuvring aids DO NOT scratch the vessel inside wall Slings wrapped around the vessel wall and suspended from the forks of a fork lift truck are safer and more stable than using forks alone Forks should always be padded before being brought into contact with any part of the vessel body. VESSEL DAMAGE: This should be reported to the shipping company and Phoenix Vessel Technology Ltd. 15 of 24

16 2.2 VESSEL SUPPORT POSITION The bending stresses generated in a long pressure vessel can be considerable and should not be ignored. Careful choice of support position can minimise bending stresses to an acceptably low level. Always follow instructions stated on the Assembly Drawing for each particular vessel design and length ordered. These recommendations are based on static loading only. No. of 40 Elements No. of Supports Distance rtween Supports (mm) Distance between Outer Supports (mm) Max Min Min Max of 24

17 2.3 MOUNTING AND CONNECTING TO VESSELS Mount vessels using support saddles provided on horizontal surface at the recommended support position and tighten straps to eliminate movement, do not tighten to more than drawing recommended torque Provide pressure relief device. This should be set to no more than 105% of design pres sure Allow for an expansion of 0.5mm per metre length of vessel at design pressure Victaulic clamps used for connection to vessel should be assembled tightly with bolt pads of clamp halves metal to metal. NOTE: Excessive torque applied to the straps may damage the vessel wall and cause the strap nut to seize onto the threaded portion. 3.1 CORROSION SECTION THREE OPERATION - Operational ph level Cleaning only ph level 2-12 for no longer than 30 mins. Imediately clean down & purge. Whilst every effort has been taken to ensure that end fittings have adequate corrosion resistance it is the responsibility of the purchaser to assess that the materials offered are suitable for the specific corrosion environment. Alternate materials are available with enhanced corrosion resistance, contact Phoenix Vessel Technology Limited for advice. End fittings should be maintained dry and free from corrosion. Vessel leaks should be investigated and corrected. 17 of 24

18 3.2 OPERATING CONDITIONS DESIGN SPECIFICATION Internal Diameter: To fit any 4 nominal diameter element. Length: Up to 240 of membrane elements. Working Fluid: Water (brackish or seawater). Design Pressure: 1200 psi (82.8 bar) psi (69.0 bar). 600 psi (41.4 bar). Test Pressure: upto 1.1 times design pressure for 15 minutes. Factory Test Pressure: 1.1 times design pressure for 15 minutes or Design Temperature: 20 to 176 deg F (-7 to 80 deg C). High Temperature 20 to 113 deg F (-7 to 45 deg C) Standard Range Expansion: Length 0.5 to 0.6 mm per metre length of vessel at design pressure. Vacuum condition: Down to psi (0 bar absolute). Support Position: 2 supports for 1 to 4 (40 ) elements. 3 supports for 5,6 (40 ) elements and any length supported outside of the recommended support range ( refer to `Vessel Support Position Section 2.2 of this User`s Guide). NOTE : The standard materials of construction may not be compatible with cleaning and preserving fluids. Alternative materials are available on request. NOTE : The product tube must not be subjected to a pressure greater than 125 psi (8.6 bar) at max. design temperature. NOTE : The vessel should not be allowed to freeze solid. This will damage the vessel wall and make replacement necessary. 18 of 24

19 3.3 SAFETY PRECAUTIONS Fiberglass reinforced pressure vessels will provide years of safe service if properly installed and maintained. This section is for guidance only and should be used in conjunction with the recommendations in the previous sections. Attention is drawn to the `NOTES :` located at the bottom of the page which highlight potential problems areas and safety recommendations Provide pressure relief device. This should be set to no more than 105% of design pressure Before pressurisation visually check that the segmented retaining rings are in position and secured by the two cap head screws and that the backnut is fitted and is screwed up tightly DO NOT stand in line of end fitting while pressurisation takes place. MEMBRANE CLEANING SOLUTIONS Ammonium Hydrogen Fluoride (also known as Ammonium BiFluoride) is a glass `etchant and will destroy a fibreglass vessel from the inside out - the fiberglass outer wrap of the membrane elements may also be weakened. Contact with this agent should be avoided. This chemical is suggested as a means of removing silica fouling (SiO2) of membranes. If silica fouling requires the use of this chemical then the membrane elements must be removed for cleaning in a purpose built cleaning vessel. 19 of 24

20 4.1 SPARE PARTS LIST SECTION FOUR APPENDIX For part numbers and descriptions refer to the relevant Assembly Drawing. When ordering spares the part number should be identified. Part numbers are referred to as `Retaining Ring CMP1469` The item may be referred to as `Retaining Ring Segment 1469` or `1469`. For spares these are sold as complete rings but listed as 2 Retaining Rings per vessel on the Assembly. Seal part numbers are referred to by their international size reference number and material e.g. : Seal EP is a seal of size 119 and material EPDM rubber. 20 of 24

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