The URL can be used to link to this page

Home My WebLink AboutI-18_PeristalticPumpsSOP_Draft_20180530CITY OF DURHAM City of Durham, North Carolina Department of Public Works Stormwater and GIS Services Water Quality Unit Title: Standard Operating Procedures for Use of Peristaltic Pumps for Sample Collection Version: 1.0 Date: 05/30/2018 Approvals Author: Date: Dave Milkereit, Senior Water Quality Technician Approved by: Approved by: Approved by: Date: Susan Gale, Water Quality Specialist, Monitoring & Assessment Date: Michele Woolfolk, Director of Stormwater Quality Date: Paul Wiebke, Assistant Director for Stormwater & GIS Services City of Durham, WQ Unit, Peristaltic Pumps SOP Page 1 of 7 05/30/2018 Revision Record Revision Date Updated by Description of change 1.0 05/30/2018 Dave Milkereit Initial draft Distribution Current copies of this approved SOP should be provided to the following positions with the City of Durham Stormwater and GIS Services: • Water Quality Manager • Assistant Water Quality Manager • Water Quality Specialist, Monitoring and Assessment • Senior Water Quality Technicians, Monitoring and Assessment • Water Quality Technicians, Monitoring and Assessment • Senior Water Quality Technicians, Investigations and Inspections • Water Quality Technicians, Investigations and Inspections • Temporary Water Quality Technicians or other staff assigned to the project The current SOP should also be provided to any contractors performing these procedures on behalf of City of Durham Stormwater & GIS Services. Abbreviations SOP I Standard Operating Procedure City of Durham, WQ Unit, Peristaltic Pumps SOP Page 2 of 7 05/30/2018 Table of Contents Title: Standard Operating Procedures for Use of Peristaltic Pumps for Sample Collection ............. Approvals............................................................................................................................................. RevisionRecord................................................................................................................................... Distribution.......................................................................................................................................... Abbreviations...................................................................................................................................... Tableof Contents..................................................................................................................................... Procedures............................................................................................................................................... Purposeand scope.............................................................................................................................. Methodsummary................................................................................................................................ Health and safety warnings................................................................................................................. Cautions and interferences................................................................................................................. Personnel qualifications and responsibilities...................................................................................... Equipmentand supplies...................................................................................................................... Methods.............................................................................................................................................. PeristalticPump Operation............................................................................................................. Maintenance and troubleshooting.................................................................................................. Data and records management........................................................................................................... References............................................................................................................................................... 1 1 2 2 2 3 4 4 4 4 4 4 5 S 5 7 7 7 City of Durham, WQ Unit, Peristaltic Pumps SOP Page 3 of 7 05/30/2018 Procedures Purpose and scope The purpose of this Standard Operating Procedure (SOP) is to establish uniform procedures for using and maintaining Geotech Series I peristaltic pumps for the purpose of water quality sampling. The procedures outlined in this SOP are applicable to City of Durham Stormwater Quality staff that collect water quality samples. Peristaltic pumps and flexible tubing are used for collecting water samples for water quality monitoring, illicit discharge investigations, and other activities requiring collection of pumped samples. A peristaltic pump operates by peristalsis, which generates vacuum pressure in the pump tube. This allows for sample collection while avoiding direct contact of pump parts with the sample. Samples can be extracted from depths up to 27 feet from catch basins and other inaccessible sampling locations. The use of a peristaltic pump is also indicated for sampling events where a filtered sample must be collected. Refer to project -specific QAPP's for filter specifications. Method summary The pump is transported in a hard case with 12V DC battery and power cord, and is quickly set up for extraction of field samples. It is used with silicone tubing, an appropriate length of rigid polyethelyne tubing, and a filter if the sample event requires a filtered sample. The Geotech Series 1 pumps require very little routine maintenance and have years of proven reliability and durability. Health and safety warnings A peristaltic pump with case, battery, and sample tubing weighs in excess of 20 pounds. Thus, consideration must be given to hazards due to improper lifting and carrying a heavy load over uneven terrain. Care must also be taken with regards to pinch hazards associated with the pump housing lever and the hinged case. The pump user must familiarize himself/herself with pump operation and all associated hazards before field deployment. The 12V battery used with the pump presents shock hazards. Improper storage and handling of the battery presents short-circuit hazards that can result in sparking and subsequent ignition hazards. The pump should not be stored or transported while connected to the battery. Cautions and interferences Careless handling of the pump, tubing, and other sampling equipment can result in contamination of samples. Pulling on wires to disconnect pump can damage wiring. The pump can also be damaged by being dropped, submerged, or subject to temperature extremes. Damaged or kinked power cords should be replaced. Personnel qualifications and responsibilities This SOP is written specifically for Stormwater Services Water Quality Unit field staff. All personnel who perform activities with this SOP must have adequate training, which includes reading all related SOPs City of Durham, WQ Unit, Peristaltic Pumps SOP Page 4 of 7 05/30/2018 and training materials. Training also includes shadowing experienced field staff before working independently. Equipment and supplies Use of the peristaltic pump requires: • Pump motor housing, pump head, and power -supply cord hard -wired with an automotive cigarette -lighter adapter end. • Hard -sided case for carrying and storage • 12V, 9A sealed lead acid battery • Battery charger • Alligator -clips hard -wired to power supply cord • 12-inch length of 0.19-inch ID silicone tubing • appropriate length of rigid polyethylene 0.17 inch ID tubing Additional optional equipment that might facilitate sampling, depending on conditions: • Flashlight • Knee pads • Extension pole for hard -to -reach locations • Sampling bottles • Weights for tubing end • Duct tape for attaching weights Methods Peristaltic Pump Operation Figure 1 shows a typical deployment of a peristaltic pump for stream monitoring. Figure 2 is a diagram of pump components. Figure 1 Typical pump deployment City of Durham, WQ Unit, Peristaltic Pumps SOP Page 5 of 7 05/30/2018 Figure 2 Pump Components 1. Upon arrival at the sample site, open the pump case and attach the battery to the motor power supply cord. Lift the pump head lever to open the pump, and thread the silicone pump tube over the pump rollers. The tubing outlet may be oriented to either side of the pump head; a FORWARD/REVERSE switch allows for operation in either direction. Lower the pump lever to close the pump housing tightly over the silicone tubing. 2. The inlet of the sampling tubing must be properly submerged in the sampling site; this is often facilitated by the presence of a second staff person. A weight or sample pole may be used to help submerge the inlet tube. 3. Activate the pump by switching the OFF/ON toggle switch to the ON position. The hub on the pump head will then begin to turn. The hub must rotate in a direction such that the top edge of the hub turns in the direction of the outlet tube. It may be necessary to switch the FORWARD/REVERSE switch, depending on how the silicone tubing is oriented in the pump head. If air bubbles discharge from the intake tube, this is an indication that the pump head is rotating in the wrong direction. Pump speed is controlled by the FAST/SLOW knob. 4. Depending on the length of the sampling tube, the pump must pump from the sample site for at least 30 seconds to flush the sample tube. Tubing lengths over 15 feet require a longer flush time. 5. If the sampling event requires a filtered sample, see Standard Operating Procedures for Sample Filtration. After the sample has been obtained, put the pump switch in the OFF position. Lift the pump head lever to open the pump, and remove the silicone tubing. Lower the pump lever to close the pump head. If alligator clips were used with the battery, remove the alligator clips from the battery. Place the pump in the case and close and latch the case. 6. Upon return to the Stormwater Lab, store the pump case open. This allows any moisture on the pump or in the case to dry. City of Durham, WQ Unit, Peristaltic Pumps SOP Page 6 of 7 05/30/2018 Maintenance and troubleshooting Refer to the pump's owner's manual and always follow manufacturer's recommendations for pump maintenance and troubleshooting. Contact the pump manufacturer or authorized service center for assistance with parts and service. Normal maintenance is limited to keeping the pump and case clean and dry. The storage case latches can be lubricated with WD-40 if they become hard to operate. If the pump motor fails to operate when switched on, check that: • The pump's speed is increased to overcome resistance from tubing or water source. • The battery is properly charged. • The battery is properly connected to the pump motor power supply cord. • The power cord is still intact. With time, internal wiring in the power supply cord will separate, though may not be readily visible. This will require the installation of a new power cord. If the pump operates but no sample is discharging, check that: • The FORWARD/REVERSE switch is set correctly. • The silicone tubing is threaded properly over the pump rollers. • The pump lever is lowered and the pump housing is closed tightly over the silicone tubing. • The intake tube isn't blocked or kinked. It may be necessary to reverse the pump to expel any blockage in the intake tube. • The intake tube is properly submerged in the sampling site. • The height from the sampling site to the pump is less than about 27 feet. The pump is designed to pump from depths up to 27 feet at sea level. Data and records management No data or records are produced during this procedure. References Geotech. 2017. Geopump Peristaltic Pump Installation and Operation Manual. Rev 03/31/2017. http://www.geotechenv.com/Manuals/Geotech Geopump Peristaltic Pump.pdf City of Durham, WQ Unit, Peristaltic Pumps SOP Page 7 of 7 05/30/2018