Mechanical Diaphragm Metering Pump

SECTION 11___

MECHANICAL DIAPHRAGM METERING PUMP

PART 1 GENERAL

1.01 DESCRIPTION

A The pump shall be reciprocating, positive displacement, mechanically actuated, flat Teflon diaphragm type, motor driven metering pump.

B. Solenoid-driven pumps, hydraulically actuated diaphragm pumps will not be accepted.

C. Each pump shall have a maximum capacity of [___ GPH at ___ PSI] or as noted in the pump schedule.

D. The pump shall have a maximum stroking rate of ______strokes per minute with capabilities of manual stroke length control.

E. Each unit shall be Grundfos DMX 226 series.

PART 2 PRODUCT

2.01 CONSTRUCTION

A. The pump housing shall be constructed of cast aluminum and coated with a corrosion resistant acrylic resin.

B. The pump design shall include provisions for optional positioning of the control interface/display, for side or wall mounting. Enclosure shall be IP65/Nema 4 rated.

2.2 DRIVE

A. A vertically mounted (1/4) (1/2) hp electric 1750 RPM motor shall drive the pump. The motor shall drive a reducing gear integral to the pump

______Project Name 11___-1 Project No. body and transmitted to an eccentric cam-tappet-spring return system to reciprocate the plunger for diaphragm actuation.

B. The drive mechanism shall not require regular field service or external lubrication. Internal gear lubricant shall not require changing for five years or 20,000 operating hours. Oiler lubrication, oil bath or oil mist systems are not acceptable.

2.3 INTERFACE

A. Stroke volume shall be freely adjustable between 0 and 100% via a hand micrometer.

B. Automatic stroke length control shall be possible by an actuator or servo motor supplied by the pump manufacturer and controlled by a 4-20mA signal.

C. AR control option

1. The interface shall provide metered output to be displayed in strokes per minute.

2. The interface shall include an access code to protect against unauthorized changes. A built in counter shall be included to provide hours of operation.

3. A priming function shall be provided on the interface that will cycle operating at full capacity without need of attenuating the pumps output setpoint.

4. A system of red and green and yellow LED lights shall indicate pump status and alarm conditions.

2.04 LIQUID END

A. The process diaphragm shall be PTFE, fabric reinforced and bonded to pre-formed elastomeric support.

______Project Name 11___-2 Project No. B. Head and valves body material shall be (PVC) (PVDF) (316 Stainless Steel) (Polypropylene), with (Glass) (Ceramic) (Stainless Steel) (PTFE) ball material.

C. Wetted gasket material shall be (FKM) (EPDM) (PTFE).

D. Suction and discharge valves are to be cartridge design that thread into the liquid end. Spring-loaded valves shall be available as an option. Direction of flow shall be clearly marked on each check valve to ensure correct installation.

E. Head design shall incorporate an optional integral pressure relief valve.

F. The liquid end shall be physically separated from the main pump body with an air gap back plate with weep hole.

G. Pump head shall include NPT threaded or tube fitting connectors for suction and discharge connections.

2.05 OPERATION

A. Repeatable metering accuracy shall be ±1.5% within the control range of 1:10 turndown.

B. The pump shall be equipped with input connections for dual level control and alarm outputs for low-level and empty tank warnings and pump alarms.

C. Pumps shall be equipped with optional stroke sensor and contact output signal that can also be used to slave a second pump.

D. The controller shall produce a 4-20mA output as an indication of stroke frequency in all operating modes.

E. A remote start/stop input shall be available that can override all other input signals.

F. An optional diaphragm leak detector shall provide a contact output and local flashing indicator light on the interface LED.

G. An optional dosing controller with proximity sensor shall verify flow and provide contact output with local flashing indicator light on the interface LED. ______Project Name 11___-3 Project No. 2.6CONTROL

A. The pump with optional AR control interface shall have four selectable control modes: Manual, analog 0/4-20mA, Contact, or Batch.

1. Manual Control

a. Output of pump is displayed in strokes per minute. Pump output adjustment is performed with increase/decrease buttons on the interface.

2. Automatic Control

a. Analog: Pump shall include direct interface provisions for analog control with 0/4-20ma inputs. The menu configuration shall permit pump maximum output weighting/scaling at selectable strokes per minute. The pump shall include a local alarm for loss of input signal.

b. Contact: The pump shall include direct interface provisions for pulse output devices. In contact control mode, the pump shall be configured with a multiply/divide function to deliver a number of strokes per incoming pulse (1:n) or pulses per stroke (n:1). The pump speed shall attenuate the delivery rate based on the frequency of pulses generated by the external device. Pump shall be operable by a reed contact or pulse signal.

c. Batch: In batch mode the pump shall respond to deliver a menu configurable quantity of strokes after receiving a remotely provided contact input.

PART 3: EXECUTION

3.01 INSTALLATION

A. The equipment shall be installed per the contract documents and manufacturer’s recommendations.

3.02 WARRANTY

______Project Name 11___-4 Project No. A. 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.

4.1 ACCESSORIES

A. Optional accessories shall include:

1. Level control inputs and cables 2. Leak detection and diaphragm rupture indicator 3. Back pressure, and relief valves 4. Foot valves and Injection valves 5. Analog/Pulse control cables 6. Alarm Relay cable 7. Pulsation dampeners 8. Calibration columns 9. All accessories and appurtenances shall be skid mounted by the pump manufacturer.

______Project Name 11___-5 Project No.