SECTION CHEMICAL FEED SYSTEM

Transcription

1 SECTION PART 1 GENERAL 1.1 SUMMARY A. This section includes the requirements for the chemical feed system shall be a complete turnkey system inclusive of all necessary fluid handling and ancillary components to ensure the reliable metering of chemical into a treatment process which includes: 1. Sodium Hypochlorite Feed System 2. Blended Phosphate Feed System B. This section includes these components of the chemical feed system: 1. Solenoid Metering Pumps 2. Calibration Column 3. Pressure Relief & Degassing Valves & Mechanisms 4. Discharge Pressure Gauge with Diaphragm Seal 5. Control Panels 1.2 RELATED DOCUMENTS: A. Drawings and general provisions of Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section. B. Related work specified elsewhere includes: 1. Section Painting 2. Section Controls and System Integration 3. Section Piping and Accessories 4. Section Valves and Accessories 5. Division 16 - Electrical 1.3 SUBMITTALS A. CONTRACTOR shall submit the following information in accordance with Section Product Data, including all electrical wiring diagram, installation, operating and maintenance, and programming information. 2. Shop drawings. 3. Characteristic performance curve showing flow rate as a function of RPM and pressure. 4. Chemical metering system arrangement and installation drawings. B. CONTRACTOR shall submit Operations and Maintenance Data in accordance with Section GM&C PROJECT NO of 8

2 1.4 QUALITY ASSURANCE A. Each chemical feed system shall be provided a single supplier. Supplier shall be responsible for complete setup of all skid mounted equipment and shall test all equipment prior to shipment. Supplier shall provide a written report of this testing to the ENGINEER. 1.5 DELIVERY, STORAGE AND HANDLING A. Shipping 1. Ship the Chemical Metering System completely assembled and ready for installation. Ship tubing separately for field installation and process line connection by contractor. 2. Pack all additional spare parts in containers bearing labels clearly designating contents and pieces of equipment for which intended. 3. Deliver spare parts at the same time as pertaining equipment. B. Receiving 1. Contractor to inspect and inventory items upon delivery to site. 2. Contractor to store and safeguard equipment, material, instructions, and spare parts in accordance with manufacturer's written instructions. 1.6 WARRANTY A. The chemical metering pump manufacturer shall provide a two year warranty on the metering pump mechanical drive and one year on the liquid end. PART 2 PRODUCTS 2.1 GENERAL A. All systems shall be skid mounted unless otherwise specified. B. All programming shall be coordinated with the systems integrator for the project in accordance with Section and If there is not a system integrator for the project, the supplier shall coordinate all controls with the ENGINEER and OWNER. C. All electrical work shall be in accordance with Division 16 of these specifications. D. CONTRACTOR shall be responsible for all additional pipe, taps, valves, etc. to place the skid system in service that may not be shown on the drawings. E. All feed systems that require potable water shall be protected with a backflow preventer. F. All ferrous metal shall be shop primed in accordance with Section SODIUM HYPOCHLORITE FEED SYSTEM A. Description 1. The chemical metering pump shall be a positive displacement, solenoid driven type with a mechanically actuated PTFE diaphragm. Output volume shall be adjustable while the pump is in operation from zero to GM&C PROJECT NO of 8

3 maximum capacity. The metering pump(s) shall be designed to deliver ml/min of 12.5% Sodium Hypochlorite at 10 psi. 2. The solid-state electronic pulsar and drive components shall be totally enclosed with no exposed moving parts. The electronics shall be fully contained within the corrosion resistant pump housing for maximum protection against chemical spillage. The chemical metering pump housing shall be of chemically resistant glass fiber reinforced thermoplastic, and all exposed fasteners shall be stainless steel. 3. The metered liquid shall enter the pump head at the bottom and exit at the top through double ball type check valves. Valves shall be free seating and guided to accurately control vertical and sideward movement of the ball. The pump head connections shall be threaded plastic to eliminate clamping bars and other metal parts subject to corrosion. 4. The metering pump shall be microprocessor controlled, and all adjustments shall be made by means of a user interface panel located opposite the pump head. The user interface panel will include a Start/Stop switch, Mode selector switch, pressure sensitive keypad, LCD display and Power On indication LED. The interface panel shall have a clear plastic cover to protect the stroke length knob and keypads from the elements. In local mode adjustments are made manually via a pressure sensitive keypad, or automatically from a 4-20 ma or pulse input signal in the remote mode. Other features of the controller include adjustable maximum and minimum stroke frequency and pulse contact multiplication and division control. The microprocessor controller shall be capable of stable operation over an ambient temperature range of 32 degrees F to 104 degrees F. 5. Capacity adjustment shall be accomplished by both stroke length and stroke frequency control. Stroke frequency control shall be manually or automatically adjustable. The metering pump shall be capable of operating at any supply voltage between 94 to 264 VAC, and pump capacity shall be unaffected by voltage fluctuations. 6. The pump shall include an integral 6-foot cord with molded 3-prong grounded plug and when applicable a signal cable with multi-pin connector. 7. The chemical metering pump manufacturer shall provide a two year warranty on the pump. The pump shall be fully tested to meet rated flow and pressure by the manufacturer. B. CHEMICAL PUMP SKID 1. The metering pumps shall be factory-mounted on a self-contained skid. The skid shall be corrosion-resistant molded polyethylene with integral pedestals to elevate equipment above the floor or containment area. All piping and accessories shall be adequately supported on the skid and not off the metering pumps, using a stainless steel or FRP uni-strut support system. The skid design shall have adequate clearance to permit access to the pumps and accessories for servicing. The metering pumps, piping and all ancillary components shall be factory-mounted, piped and wired as a fully functioning chemical dosing system. Skids supplied with the specified pumps but assembled or integrated by third party facilities, agents, or reps are not acceptable. 2. Provide (2) pumps on each skid, one duty and one standby. Provide the metering pumps with an elevated suction pipe manifold including a strainer GM&C PROJECT NO of 8

4 and appropriately sized calibration column. The discharge pipe manifold shall include a pressure relief valve, back pressure valve, and pressure gauge with diaphragm seal. Piping shall include CPVC vented ball-type isolation valves in the suction and discharge of each pump. The chemical metering pump skid will be completely factory assembled and tested prior to delivery to the jobsite. ALL CHEMICAL PIPING SHALL BE CPVC. C. ACCESSORIES 1. Provide a properly sized relief valve for installation in the discharge of each pump. The pressure relief valve shall be of the spring-loaded diaphragm type constructed or materials compatible with the fluid pumped. The relief valve shall be field adjustable. Relief valve shall be Model RV-PVC or equal. 2. Provide a properly sized back pressure valve for installation in the discharge of each pump skid. The back pressure valve shall be of the spring-loaded diaphragm type constructed or materials compatible with the fluid pumped. The back pressure valve shall be field adjustable. Back Pressure valve shall be as supplied by the manufacturer. 3. Provide a properly sized calibration column made of clear PVC with a vent fitting at the top for installation in the pump suction line. Calibration column shall be direct reading in both ml/minute and GPH, and sized to allow for a minimum 30-second drawdown. Calibration column shall be as manufactured by the manufacturer. 4. A pulsation dampener shall be provided in each pump discharge line sized to provide (90%/95%) degree of dampening. The pulsation dampener shall be hydro-pneumatic vertical-type with two chambers separated by a single, elastomeric bladder. The pulsation dampener shall be supplied with a gas charge valve and 2-1/2 pressure gauge. Materials of construction shall be compatible with the chemical service. 5. Degassing mechanism shall be provided as designed by the manufacturer for NaOCl Off gassing. 6. Provide one (1) preventative maintenance kit for each metering pump. The kit shall contain those spare parts recommended by the manufacturer to provide one year of normal pump operation. 7. Provide a diaphragm isolated pressure gauge for each metering pump. D. Local Control Panel 1. Each skid shall be provided with its own local control panel mounted and pre-wired. Local disconnect is provided by duplex receptacle with weatherproof cover mounted on the skid proper. Enclosures shall be NEMA 4X FRP construction. 2. The pump control panels shall provide all the functions and interfaces as shown on the specification P&ID s, including but not limited to the following features: Main circuit breaker and branch circuit breakers as needed. 3. Each pump shall have a device mounted on the door of the control panel for operator interface, 4. Each pump shall have the following signals available for the plant SCADA/PLC via hard wire connection: Pump running status, pump GM&C PROJECT NO of 8

5 alarm status, Pump speed analog feedback, and remote mode selected status. 5. Each pump shall accept the following signals from the plant SCADA/PLC via hard wire connection: Dry contact pump enable, Analog 4-20mA speed command. 6. All components shall be UL listed or Recognized, door mounted devices shall be NEMA 4x, 22mm, Heavy Duty, Oil Tight, and instrumentation shall also be NEMA 4X rated. 7. Control panels shall be assembled to NFPA 79 standards and good engineering practices. E. APPLICATION 1. Quantity: two (2) pumps, one (1) skid (duty and stand-by) 2. Chemical Service: 12% Sodium Hypochlorite 3. Capacity (U.S. gpm): 0.25 (950ml/min max.) 4. Tubing I.D. (in): 3/4 5. Suction Head: See Plans F. MANUFACTURER The chemical systems shall be as provided by the following: 1. Neptune Model PZiG Prominent Fluid Controls, Inc. 3. OR PREAPPROVED EQUIVALENT 2.3 BLENDED PHOSPHATE FEED SYSTEM A. Description 1. The chemical metering pump shall be a positive displacement, solenoid driven type with a mechanically actuated PTFE diaphragm. Output volume shall be adjustable while the pump is in operation from zero to maximum capacity. The metering pump(s) shall be designed to deliver GPH of Aqua-Mag at 10psi. 2. The solid-state electronic pulsar and drive components shall be totally enclosed with no exposed moving parts. The electronics shall be fully contained within the corrosion resistant pump housing for maximum protection against chemical spillage. The chemical metering pump housing shall be of chemically resistant glass fiber reinforced thermoplastic, and all exposed fasteners shall be stainless steel. 3. The metered liquid shall enter the pump head at the bottom and exit at the top through double ball type check valves. Valves shall be free seating and guided to accurately control vertical and sideward movement of the ball. The pump head connections shall be threaded plastic to eliminate clamping bars and other metal parts subject to corrosion. 4. The metering pump shall be microprocessor controlled, and all adjustments shall be made by means of a user interface panel located opposite the pump head. The user interface panel will include a Start/Stop switch, Mode selector switch, pressure sensitive keypad, LCD display and Power On indication LED. The interface panel shall have a clear plastic cover to protect the stroke length knob and keypads from the elements. In local GM&C PROJECT NO of 8

6 mode adjustments are made manually via a pressure sensitive keypad, or automatically from a 4-20 ma or pulse input signal in the remote mode. Other features of the controller include adjustable maximum and minimum stroke frequency and pulse contact multiplication and division control. The microprocessor controller shall be capable of stable operation over an ambient temperature range of 32 degrees F to 104 degrees F. 5. Capacity adjustment shall be accomplished by both stroke length and stroke frequency control. Stroke frequency control shall be manually or automatically. The metering pump shall be capable of operating at any supply voltage between 94 to 264 VAC, and pump capacity shall be unaffected by voltage fluctuations. 6. The pump shall include an integral 6-foot cord with molded 3-prong grounded plug and when applicable a signal cable with multi-pin connector. 7. The chemical metering pump manufacturer shall provide a two year warranty on the pump. The pump shall be fully tested to meet rated flow and pressure by the manufacturer. B. CHEMICAL PUMP SKID 1. The metering pumps shall be factory-mounted on a self-contained skid. The skid shall be corrosion-resistant molded polyethylene with integral pedestals to elevate equipment a minimum of 12 above the floor or containment area. All piping and accessories shall be adequately supported on the skid and not off the metering pumps, using a stainless steel or FRP Uni-strut support system. The skid design shall have adequate clearance to permit access to the pumps and accessories for servicing. The metering pumps, piping and all ancillary components shall be factory-mounted, piped and wired as a fully functioning chemical dosing system. Skids supplied with the specified pumps but assembled or integrated by third party facilities, agents, or reps are not acceptable. 2. Provide (2) pumps on each skid, one duty and one standby. Provide the metering pumps with a suction pipe manifold including a strainer and appropriately sized calibration column. The discharge pipe manifold shall include a pressure relief valve, back pressure valve, and pressure gauge with diaphragm seal. Piping shall include PVC ball-type isolation valves in the suction and discharge of each pump. The chemical metering pump skid will be completely factory assembled and tested prior to delivery to the jobsite. C. ACCESSORIES 1. Provide a properly sized relief valve for installation in the discharge of each pump. The pressure relief valve shall be of the spring-loaded diaphragm type constructed or materials compatible with the fluid pumped. The relief valve shall be field adjustable. Relief valve shall be Model RV-PVC or equal. 2. Provide a properly sized back pressure valve for installation in the discharge of each pump. The back pressure valve shall be of the springloaded diaphragm type constructed or materials compatible with the fluid pumped. The back pressure valve shall be field adjustable. Back GM&C PROJECT NO of 8

7 Pressure valve shall be Model BP-PVC as manufactured by Neptune Chemical Pump Company or equal. 3. Provide a properly sized calibration column made of clear PVC with a vent fitting at the top for installation in the pump suction line. Calibration column shall be direct reading in both ml/minute and GPH, and sized to allow for a minimum 30-second drawdown. Calibration column shall be as manufactured by Neptune Chemical Pump Company or equal. 4. Provide one (1) preventative maintenance kit for each metering pump. The kit shall contain those spare parts recommended by the manufacturer to provide one year of normal pump operation. 5. Provide a diaphragm isolated pressure gauges for each metering pump. 6. A Digital tank scale shall be provided for each gaseous chemical feed system. The scale shall be 120V. The scale shall be a Scaletron Model 4021, Forceflow, OR APPROVED EQUAL, Digital Tank Scale with 4-20mA output. D. LOCAL CONTROL PANEL 1. Each skid shall be provided with its own local control panel mounted and pre-wired. Local disconnect is provided by duplex receptacle with weatherproof cover mounted on the skid proper. Enclosures shall be NEMA 4X FRP construction. 2. The pump control panels shall provide all the functions and interfaces as shown on the specification P&ID s, including but not limited to the following features: Main circuit breaker and branch circuit breakers as needed. 3. Each pump shall have a device mounted on the door of the control panel for operator interface, 4. Each pump shall have the following signals available for the plant SCADA/PLC via hard wire connection: Pump running status, pump alarm status, Pump speed analog feedback, and remote mode selected status. 5. Each pump shall accept the following signals from the plant SCADA/PLC via hard wire connection: Dry contact pump enable, Analog 4-20mA speed command. 6. All components shall be UL listed or Recognized, door mounted devices shall be NEMA 4x, 22mm, Heavy Duty, Oil Tight, and instrumentation shall also be NEMA 4X rated. 7. Control panels shall be assembled to NFPA 79 standards and good engineering practices. E. APPLICATION 1. Quantity: two (2) pumps, one (1) skid (duty and stand-by) 2. Chemical Service: AQUA-MAG 3. Capacity (U.S. gph): Tubing I.D. (in): ½ 5. Suction Head: See Plans F. MANUFACTURER The chemical systems shall be as provided by the following: 1. Neptune Model PZi4 GM&C PROJECT NO of 8

8 2. Prominent Fluid Controls, Inc. 3. OR PREAPPROVED EQUIVALENT PART 3 EXECUTION 3.1 EXAMINATION A. Verify that dimensions are correct and project conditions are suitable for installation. Do not proceed with installation until unsatisfactory conditions have been corrected. 3.2 INSTALLATION A. All equipment shall be installed in accordance with approved submittals and manufacturer s recommendations. B. All systems shall be tested prior to shipment to the project site. Manufacturer or supplier shall provide written results of this testing. C. CONTRACTOR shall be responsible for all additional installation of pipe, valves, etc. for a complete project installation. CONTRACTOR shall also use appropriate material for installation based on type of chemical being pumped. D. Contractor shall install the chemical metering pump system(s) in accordance with the drawings, specifications and manufacturer s shop drawings. E. CONTRACTOR shall connect suction, discharge, vent and drain connections as required. F. CONTRACTOR shall supply shielded signal wiring for wiring of the required remote input and output to the connectors. 3.3 STARUP, TESTING AND TRAINING A. Startup chemicals shall be provided by the OWNER. CONTRACTOR shall give 30 days of notice to the ENGINEER and OWNER prior to startup of chemical feed systems to allow for shipment of the chemicals. B. Manufacturer shall provide factory authorized representative for a minimum of 3 days total startup time for all chemical feeds systems together. Manufacturer shall also provide a written startup report that will be submitted by the CONTRACTOR to the ENGINEER. C. Manufacturer shall provide a minimum of 1full day of training the OWNER S personnel on operations and maintenance for each chemical feed system provided. END OF SECTION GM&C PROJECT NO of 8