SECTION 11___

CHLORINE DIOXIDE GENERATING EQUIPMENT

PART 1 GENERAL

1.01DESCRIPTION

  1. This document covers the equipments and materials necessary to install and operate a chlorine dioxide generator. The system, as specified herein, shall be a compact pre-mounted generation and dosing system for chlorine dioxide according to sodium chlorite / hydrochloric acid method with chemicals-saving and 1:1 mixing ratio. A batch tank for final product storage and feed shall be integrated in to the generator system.
  1. The chlorine dioxide generator shall use dilute concentrations of chemicals for generation; 7.5% sodium chlorite and 9% hydrochloric acid.
  1. Each generator shall have a maximum capacity of [5 g/h, .26 lb/day] [10 g/h, .54 lb/day] [30 g/h, 1.6lb/day] [60 g/h, 3.12 lb/day].
  1. Each generator shall be Grundfos / AlldosOxiperm OCD 162.

1.02MANUFACTURER

  1. Manufacturer shall submit proof of the following qualifications.
  2. The manufacturer is the actual manufacturer of the equipment being supplied.
  3. The Manufacturer has successfully designed and manufactured similar equipment for at least 5 years.
  4. The Manufacturer has the required financial capability.
  5. The Manufacturer maintains a qualified technical engineering staff and design office.
  6. The Manufacturer operates a physical plant and employs fabricating personnel to complete the work specified.
  7. The Manufacturer shall maintain competent service personnel to service the equipment furnished.
  8. The unit shall be manufactured by Grundfos Pumps Corporation or equal
  9. The manufacturer or authorized factory representative shall conduct a pre-installation site inspection of the application to ensure the proper application of all chlorine dioxide generating equipment and associated systems and controls.

PART 2 PRODUCT

2.01 GENERATION

  1. Capacity: The generator shall generate up to _____ grams/hour of chlorine dioxide solution, the chlorine dioxide concentration shall be 2.0 mg/L.
  1. Chemical usage: the generator shall use diluted hydrochloric acid (9%) and diluted sodium chlorite solutions (7.5%), The system is equipped with microprocessor control to inject process water, hydrochloric acid and sodium chlorite consecutively in to the generator chamber. Feed of the chemicals are verified through integrated level sensors.
  1. Production: the generator will produce chlorine dioxide solutions in to an integrated batch overflow tank, and feed the solution with an integrated feed pump [continuously into the process as required by the controls] [in batch generation as required to maintain a constant chlorine dioxide batch tank reservoir between preset volume levels].
  1. Electric Power: The generator shall operate at 115 Volt / 60Herz/ Single phase or 220 Volt /60Herz / Single phase.
  1. Chlorine dioxide solution delivery: The generator shall include a distribution pump included in the generator box system,controlled directly via the generator controller, or independently-controlled; the distribution pump is capable of delivering chlorine dioxide solution against 145 PSI pressure using an internal stepper motor. Solenoid driven pumps are not acceptable.
  1. The pumps shall have PVDF head materials with PTFE gaskets and diaphragm and capable of a 4-20mA analog or digital contact control signal and a 4-20mA analog output signal.
  1. The distribution pumps shall be manufactured by Grundfos Pumps Corporation or equal.
  1. Safety interlocks:
  1. The generator system shall have a customer controlled safety interlock to shut-down the entire generator system.
  1. The chlorine dioxide generator shall cease chemical generation if the level sensors in the generation chamber or batch holding reservoir fail to match the operation mode.
  1. The generator system shall include an air bladder system connected to a carbon filter to control any gas accumulation from the top of the generation chamber.
  1. All necessary generation and feed equipment, including the precursor pumps, generation chamber, microprocessor control, overflow batch product holding tank, off-gassing safety system and product feed pump shall be integrated in to a single boxed system for simple mounting on a frame or directly to the wall.

2.02INTERFACE

  1. The chlorine dioxide generator shall provide an interface through a control PLC with 4-line plain text lit display with menu-controlled operator prompting. The control PLC menu interface shall be used for commissioning, entering operation parameters, rinsing the system and maintenance.
  1. The control PLC shall be capable of direct connection to chlorine dioxide, redox (ORP)) or pH measuring cells for control of chlorine dioxide feed through direct system measurement.
  1. The measuring cell for pH, redox or chlorine dioxide measurement shall be an Aquacell AQC unit with flow over the measurement probe(s).
  1. The measuring cell shall be manufactured by Grundfos Pumps Corporation or equal.
  1. The generator shall include the following outputs: a 0/4-20mA analog outputs for pump control and chlorine dioxide measurement and digital alarm outputs to include error status, feed chemical tank empty pre-alert signal and batch product tank dry-run alarm. The feed pump shall be controlled by either an analog or dry contract control signal.

2.05OPERATION

  1. The chlorine dioxide generator shall use two chemical pumps to feed dilute solutions of hydrochloric acid (9%) and sodium chlorite (7.5%).
  1. The precursor feed pumps shall be internal motor-driven pumpsand are manufactured by Grundfos Pumps Corporation or equal. Solenoid driven pumps are not acceptable.
  1. Precursor chemicals and process water shall be pumped directly to a reaction chamber for production of chlorine dioxide. The reaction chamber shall be [950 mL] [1900 mL] in size and include a three position level sensor to verify precursor feed. Any error detected between the level sensors and the controller shall cause the generator to cease chlorine dioxide production.
  1. The chemicals shall undergo a 15 minute reaction time in the reaction chamber, as controlled by the process controller, and then be fed through gravity and water make-up flow into the batch, product holding tank directly beneath the reaction chamber. The batch tank shall be [950mL] [1900mL] in size and include a level sensor. Any error between the level sensor and the controller shall cause the generator to cease chlorine dioxide production.
  1. The generator will consume no more than [0.033 gal/h] [0.065 gal/h] [each of sodium chlorite and hydrochloric acid solutions and [1.65 gal/h] [3.32 gal/h] of water at maximum capacity.
  1. The generator shall produce chlorine dioxide in a concentrationof ca.2.0 g/L.
  1. Chlorine dioxide solution will be fed from the batch product holding tank to [the process continuously as required by the system control] [to a batch tank reservoir system with level controls for future dispersal into the process] through an integrated product feed pump.

2.06CONTROL

  1. The generator shall include the capability of several control methods; including manual, batch, current input, contact input and external target value control.

1. Manual Control

  1. Continuous: Control of the product feed pump from 0 to 100% through manual input with continuous batch production.
  1. Single Batch Dosing: Control of the product feed pump from 0 to 100% through manual input with a single batch production.

2. Automatic Control

  1. Batch: 100% system performance as controlled by an external buffer product tank, with continuous batch production.
  1. Proportional: Control of the product feed pump from 0 to 100% through a flow-paced proportional control signal and with continuous batch production. The flow signal can be provided by a contacting head water meter or flow meter either to the controller or directly to the feed pump.
  1. Set point Control: Control of the product feed pump from 0 to 100% through a target set point control from the controller as measured from a chlorine dioxide measuring cell, with continuous batch production. The set point controller uses the measuring cell values of chlorine dioxide in the system to change the control signal to the product pump.
  1. Combined Control: Control of the product feed pump from 0 to 100% through both a water flow-paced proportional signal and a chlorine dioxide set point control, with continuous batch production. The controller uses signals from a contacting head water meter or flow meter, and a measuring cell to change the control signal to the product pump.

PART 3: EXECUTION

3.01INSTALLATION

A.The equipment shall be installed per the contract documents and manufacturer’s recommendations, and shall include, but is not limited too:

  1. Foundation, concrete pad or anchor bolts.
  2. Electrical wire, junction boxes or conduit.
  3. Erection and installation.
  4. Interconnecting piping between the generator and the customer feedpoint.
  5. Piping supports or wall sleeves for the piping.
  6. Water supply and/or necessary pumps.
  7. Supply water pressure regulator if required.

3.02WARRANTY

  1. The equipment/system warranty, unless otherwise stated, shall be warranted to be free of defects in material and workmanship for a period of 24 months from the date of installation, but not more than 30 months from the date of manufacture.

4.01ACCESSORIES

A. Optional accessories if specified shall include:

  1. Level control inputs and cables
  2. Flow monitor sensor with direct connection to the pump
  3. Back pressure, and relief valves
  4. Foot valves and Injection valves
  5. Analog/Pulse control cables
  6. Alarm Relay cable

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Project Name11___-1Project No.