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HomeMy WebLinkAbout02727 - CARRIER CORP CONVENTION CENTER CHILLER MAINTENANCE Cindy Berardi From: Jan Anderson Sent: Sunday, October 03, 2010 1:03 PM To: Cindy Berardi Subject: Re: Old Contract A2727 Carrier Jo, we are going to bid this out for a ew 5 year contract �rom: Cindy Berardi 'o: ]an Anderson ;ent: Wed Sep 29 08:41:22 2010 P'ubject: Old Contract A2727 Carrier the attached contract still active for water treatment and chiller maintenance services at the Convention Center? It's an oldie! :<A2727 Carrier.pdf» .,indq 5cr::ardi >'Put)citrj cIcric )trlcc:of tkc City Clcrk ;ity of Palm Springs '. O. Box 2743 'alm Springs, CA 92262 760) 322-8355 indy.Berard i(c_palmspringsca.gov 'lease note the office hours for City Hall are Monday-Thursday Sam-6pm, and we are closed on Fridays. 'lease consider the environment prior to printing this e-mail. Thank youl inic��nin Bldg Systems & Services Div URN THIS COPY TO: Carrier Corporation - Conv chiller mntce 1989-90, w/1 City Clerk p AGREEMENT #2727 optic Box 1Spr Service Agreem( P10 -- 6- - -- — Palm Springs, CA 92263 �J --- "- This AGREEMENT entered into by and between: City of Palm Springs Convention Center Palm Springs, Ca Hereinafter referred to as "CUSTOMER" and BUILDING SYSTEMS AND SERVICES DIb9SION OF CARRIER CORPORATION Hereinafter referred to as "CARRIER" 981QO4164 WT 6/8/1989 PROPOSAL NO PROPOSALTYPE PROPOSAL DATE AGREEMENT NO ' o BUILDING SYSTEMS AND SERVICES 5-60(9-e6) 917-067 • SERVICE AGREEMENT service(s)to be provided at the CUSTOMER'S location(s)as indicated on preceeding page or on the attached Schedule Page(s).The page(s) indicated with an X' below are part of this AGREEMENT. HEATING& —_AIR III,WATER ©� COOLING =` = HEATING _ COOLING _ — RL d� =CONTROLS — DISTRIBUTION WATER CHILLER BOILER HEAL-PUMP AIR HANDLER _ DEC PACKAGED AIR FURNACE HEAT RECLAIM COOLING TOWER ELECTRIC CONDITIONER HEAT EXCHANGER PACKAGED AIR _ _ FILTER SVC ELECTRONIC ANALYSIS SVC UNIT HEATER CONDITIONING& PUMPS PNEUMATIC NON-DESTRUCTIVE HEATING TERMINALS TESTING x WATER TREATMENT ----------------------------------I-----..___.-----._____----.--_____-----.__-______-------------------._____..____ DIALOG SERVICE(equipment monitoring) Other • This AGREEMENT shall be administered by CARRIER'S office presently located at: Carrier Building Systems and Services 2957 Saturn St. Unit C Brea, Ca 92621 `-:-' • CARRIER shall provide maintenance service in accordance with the "General Provisions", "Scope of Service", =' "Schedule Page(s)",and any"Amendment(s)"which constitute(s)an entire AGREFMENTarid shall become valid after acceptance by CUSTOMER and approval by CARRIER. Reference to CUSTOMER'S request for quotation or other documents are made a part of this AGREEMENT only to the extent of specifying the nature of the goods and services -- '� ordered and to the extent that such Items or terms are consistent with this AGREEMENT. No agent of CARRIER or `-) �w °, employeeshad haveauthorilyto alter or waive any clause of this AGREEMENT unless prior written approval isobtained i from CARRIER headquarters. 3 r R • The first year price is$ 6912.00 per year payable$ 576-00 per monl_h �6 Any subsequent price may be adjusted on any anniversary date in accordance with the PRICE ADJUSTMENT page V� During new equipment warranty,the AGREEMENT price will be$ NA per NA uJ�c frP It is understood that the warranty expires NA `-�, •J • This AGREEMENT shall become effective on 7/1/1989 and shall continue until terminated. Unless otherwise k indicated for a particular service option,either party may terminate this AGREEMENT at the end of the first - one b Ez rz. year(s)term or at the end of any subsequent one year term by giving the other party at least thirty(30)days prior ca written notice. • The undersigned affirm that they have read and understand the entire AGREEMENT including the General Provisions appearing on the reverse side. Execution by Authorized Representatives: Page 2 of 1 r SUBMITTED BY: _21t�`_",t..; 1,�„�r�- Pr;�lUvh )�_'�`�dl/��C-� DATE. _ 6/8/1989 CUSTOMER ACCEPTANCE: ManagerCARRIER APPROVAL: I,� y Account l\� CITY i��•�� y� P� n BUILDING SYSTEMS&SERVICES 1.dAdi SS:L1'll :lg�i il,1'1`;j DIVISION OF CARRIER CORPORATION as* �' Customer Company Name ' ` �jp• NORI fAN R. �I�G tz. - — — -- — CITY-. r-n '• Edward D. Waite LWI Customer Acceptance(typed/printed name) I0I'"I�'�-t�Ei�' Carrier Appmval(typed/printed name) > Branch Service Manager Tile n��o p 2 p U J 14 ��"19 T \y, JZJ Customer Acceptance(signatu(e) Dale Carrier Approval(signature) Dale S-60A(9-88) 917-066 GE14ERAL PROVISIONS 1 PAYMENT shall be net upon receipt of invoice.CARRIER reserves the right to discontinue its service anytime payments have not been made as agreed. In addition to the AGREEMENT price,;the CUSTOMER shall pay CARRIER any applicable taxes or government charges,existing or imposed after acceptance date,which are required in connection with the service or material furnished under this AGREEMENT. I 2. CUSTOMER SHALL permit access to the building and the use of building:services,shall keep areas adjacent to the equipment free of extraneous material,move any stock,fixtures,walls,or partitions needed to perform the work under this AGREEMENT and shall promptly notify CARRIER of any unusual operating conditions during the time when CARRIER is not on the fob site. j 3. NORMAL WORKING HOURS will apply to all services including major repairs performed under this AGREEMENT except for unscheduled service if so indicated on Schedule Page(s) Services requested by CUSTOMER which are not covered under this AGREEMENT,will be invoiced at CARRIER'S prevailing labor and parts charges. 4. EXCLUDED from this AGREEMENT, unless otherwise stated herein, are repairs or replacements of disconnect switches, circuit breakers and items not normally mechanically maintainable such as ductwork, casings,cabinets, fixtures,structural supports,grillage,tower fill,water piping,steam piping,drain piping,boiler shell,boiler to bes and boiler refractory. 5 NOT INCLUDED in this AGREEMENT are repairs,replacements,alteratioris,additions,adjustments,repairs by others, or unscheduled calls any of which are necessitated by negligent operation,abuse, misuse, prior neglect,vandalism, obsolescence,building system design,damage due to freezing weather,corrosion,erosion,or any other cause beyond CARRIER'S control. 6. NOT INCLUDED is the identification, detection, abatement, encapsulating or removal of asbestos, or products or materials containing asbestos or similar hazardous substances In the event that CARRIER encounters any asbestos product or material in the course of performing its work, CARRIER shall have the right to discontinue its work and remove its employees from the project,or that portion of the project wherein such product or material was encountered,until such product or materials,and any hazards connected therewith are abated,encapsulated or removed,and/or it is determined that no hazard exists CARRIER shall receive an extension of time to complete its work hereunder and compensation for delays encountered as a result of such situation and correction of same 7. CARRIER SHALL NOT,under any circumstances,be liable for any accident,injury,breakage,loss or damage to the equipment or machinery, appliances, or property connected therewith,or the resultant consequences, unless such loss or damage is caused by[he negligence of CARRIER'S agents,employees,or subcontractors Also CARRIER shall not be required to perform tests,install any items of equipment or make modifications that may be recommended or directed by insurance companies,government, state, municipal or other authority 8 DELAYS occasioned by conditions beyond the reasonable control of ether party shall not be the liability of either party to this AGREEMENT. 9 WARRANTY: CARRIER guarantees that all service provided under this AGREEMENT shall be performed in a workmanlike manner.Any claim fordefective workmanship must be provided to CARRIER by written notice prior lothe termination date of this AGREEMENT upon which CARRIER agreesto remedy and redo any such service(s)in a timely manner without cost to the customer CARRIER also warrants against defects in materials, and workmanship of all CARRIER part(s) or component(s) supplied hereunder for a period of one year from date of installation or until the termination date of this AGREEMENT, whichever is earlier.If any part(s)or component(s)should prove defective during the aforementioned warranty period. CARRIER will at its option repair,replace orissue credit forany such items provided they were not damaged,abused,or effected by chemical properties THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS, IMPLIED OR STATUTORY INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE CARRIER'S obligation to repair,replace,perform a service,or issue credit for any defective part(s),component(s),or service shall be CUSTOMER'S exclusive remedy under this AGREEMENT Part(s), components) or services furnished by others to CARRIER carry the same guarantee to CUSTOMER as CARRIER receives. If the CUSTOMER requests parts or services not included in this AGREEMENT and has not selected the option for REPLACEMENT PARTS or other optional service, it is agreed that all requested part(s), component(s)or services supplied by CARRIER will be accepted subject to the CARRIER Conditions of Sale issued with each order 10. NEITHER PARTY to this AGREEMENT shall hold the other responsible fdr any indirect or consegential damages of a commercial nature such as, but not limited to, loss of revenue or loss of j�se of any equipment or facilities 11 BOTH PARTIES agree that any claim arising from the performance or nonperformance of this AGREEMENT,whether based upon contract, negligence strict liability or otherwise, shall be brought within one H)year from the date such claim arose Page 3 - -— AIR&WATER - - _ - WATER DISTRIBUTION SCHEDULE TREATMENT SERVICE City of Palm Springs CUSTOMER AGREEMENT NO ' Convention Center, Palm Springs, Ca LOCATION(If different than page 1) EFFECTIVE DATE WATER TREATMENT Service to be furnished on the circuits and/or equipment listed below as necessary to protect the tubes, tube sheets,water boxes and equipment water side against scale and tube fouling The CUSTOMER to allowthe installation of chemical feeding equipment,a solenoid valve(if not presently installed),accept shipments of chemical supplies, and provide city water with a valve for the chemical feeder. The CUSTOMER to perform the normal daily operating and log procedures and advise of any unusual water treatment conditions WATER TREATMENT SERVICE OPTIONS A "YES" indication means the service(s) is included in this AGREEMENT.A"NO"indication means the service(s) is not included. Yes/No ITEM yes 1 Provide 12 _ jobsite WATER TREATMENT service inspections per—year yes 2.The chemical feed purri chemical sensing and control devices to be no _ provided by CARRIER and remain CARRIER'S property or RO - provided by CARRIER and purchased by CUSTOMER or yes CUSTOMER'S existing equipment to be utilized yes 3 Provide mechanical maintenance of chemical feed pump(s),chemical sensing and control devices -yes q Collect and analyze pertinent water and deposit samples — including written reports no 5. Remote alarm/alert monitoring of pertinent water treatment sensing points yes-- 6. Provide corrosion monitoring coupons including coupon rack. EQUIPMENT/CIRCUIT DESCRIPTION: Quantity Equipment 1 Chiller 1 Ice Builder System Loop (Same as chiller) 1 Hot Water Boiler-Closed Water Loop 1 Cooling Tower-Condenser Loop Monthly Preventative Maintenance: Utilizing Aquatrol water treament chemicals and consulting services for continued treatment and control (includes test kits, and minor cali- bration and repairs to the existing feed and bleed controller equipment) . Includes treatment needed to initially charge the chilled loop. Special- Chilled System: Use of the ION Exchange System (ammonia removal) . Equipment list continued on next page (Yes/No) - - Page of 3-60N(5-88) 91/-U8I AMENDMENT City of Palm Springs CUSTOMER PROPOSAL NO Convention Center, Palm Springs, Ca LOCATION(II different than page 1) PROPOSAL DATE AGREEMENT NO EFFECTIVE DATE Optional Service We strongly recommend an initial system 'Boil-out and Flush' (one time charge) . (Treatment and consulting only) . . . . . . . . . . . . . . . . . . . . . . . . .$576.00 Page of S-80AA(5-88) - - - -- - _ - --- - - - �- _ _ 917-093 CITY OF PALM SPRINGS CONVENTION CENTER WATER ANALYSIS REPORT SAMPLE DATE: 5-18-89 TEST DATE: 5-19-89 REPORT DATE: 5-19-89 SAMPLES COLLECTED BY: DIETER FUCHS, AQUATROL DIVISION MAKE- COOLING CHILLED HEAT UP TOWER LOOP LOOP pH 7.8 8.5 8.1 11.0 CONDUCTIVITY 461 787 532 2008 (MMHOS. ) T ALKALINITY 140 232 183 - IRON TOTAL (FE) 0.41 0.62 3.32 3.92 T. HARDNESS (CAC03) 159 268 121 - CALCIUM (CAC03) 139 227 98 - MAGNESIUM (CAC03) 20 41 23 - CHORIDES (CL-) 17 29 18 - MOLYBDENUM (MO) 0 0 27 0 NITRITE (NO2) - - - 712 ORTHO PHOSPHATE (OPO4) <.1 < . 1 4.6 - COPPER (CU) * 0.06 0.10 2.11 0.32 AMMONIA (NH3) ** 0. 11 0. 12 1.12 - CHROMIUM (CRO4) - NO ND ND TOLYLTRIAZOLE (TTA) - ND TRACE - ND = NOT DETECTED * = BATHOCUPROINE DISULFONATE METHOD ** = NESSLERIZATION METHOD RESULTS ARE EXPRESSED AS PPM (PARTS PER MILLION), UNLESS OTHERWISE INDICATED. CITY OF PALM SPRINGS CONVENTION CENTER JUNE 2, 1989 OBSERVATIONS AND RECOMMENDATIONS: SYSTEM: CHILLED WATER LOOP AND STORAGE ICE BUILDER. 1) OBSERVATIONS: THE CONVENTION CENTER CHILLED WATER SYSTEM HAS EXPERIENCED SEVERE COPPER CORROSION RESULTING IN SIGNIFICANT DAMAGE TO THE COPPER AIR HANDLER COILS. EVIDENCE OF COPPER CORROSION WAS CONFIRMED BY BOTH VISUAL INSPECTION OF THE COPPER COILS, AS WELL AS LABORATORY ANALYSIS OF THE SYSTEM WATER. FURTHER INVESTIGATION, AS WELL AS CONFIRMATION FROM OTHER RELIABLE SOURCES, HAS REVEALED AMMONIA (NH3) COMPONENTS WITHIN THE COPPER CORROSION DEPOSITS, AS WELL AS, CONTAINED IN THE SYSTEM BULK WATER. THE ATTACHED ANALYSIS, DATED 5-18-89, CONFIRMS TRACE AMMONIA IN THE BUILDING WATER, AND A MORE SIGNIFICANT QUANTITY CONTAINED IN THE CHILLED WATER LOOP SYSTEM. OUR METHOD OF SAMPLING INVOLVES COLLECTING THE WATER IN A GLASS CONTAINER, IMMEDIATE PH ADJUSTMENT TO 2.0 (NECESSARY TO STABILIZE THE AMMONIA, OTHERWISE IT WILL VENT OFF), REFRIGERATING THE SAMPLE (42-48 DEG. F), AND TESTING WITHIN 24-36 HOURS. SUBSEQUENT SAMPLES TESTED REVEALED A MUCH LOWER AMMONIA RESULT, HOWEVER, THIS WAS DUE TO LACK OF PROPER SAMPLE 'FIXING' , AND CONSEQUENT PARTIAL DISSIPATION OF THE AMMONIA CONTENT. IT IS IMPORTANT TO NOTE HOWEVER, AMMONIA (NH3) WAS PRESENT IN THE CHILLED WATER IN BOTH CASES, ACCORDING TO OUR LABORATORY RESULTS. THE GRAPH BELOW REVEALS THE MECHANISM OF AMMONIA REMOVAL AVAILABLE FROM PH. THIS GRAPH WILL ILLUSTRATE TWO POINTS: 1) AMMONIA IS STABLE IN LOW PH WATER, WHICH IS WHY PH 'FIXING' IS IMPORTANT TO ANALYSIS 2) UPPER PH CONTROL WILL FREE THE AMMONIA TO VENT—OFF, WHICH IS AN IMPORTANT POINT WHEN CONSIDERING THAT YOUR CHILLED WATER SYSTEM CONTROL PH SHOULD BE MAINTAINED AT 10.5 OR ABOVE, AND ACCORDING TO OUR ANALYSIS, IT HAS NOT BEEN. 100 90 z 60 .l 70 O F �. 60 77F IOOF 0 50 a z 40 30 20 10 06.0 7.0 e.0 9.0 10.0 11.0 12.6 pH Percent NH,available for removal. CITY OF PALM SPRINGS CONVENTION CENTER PAGE 2 2) BESOLUTION ANDRESOLVE: IN ORDER TO CORRECT THE PROBLEMS FACING YOUR CHILLED WATER SYSTEM, SEVERAL AREAS MUST BE ADDRESSED AND ACTED ON. - THE THREAT OF AMMONIA CONCENTRATING IN THE BULK WATER MUST BE DEALT WITH. IRRESPECTIVE OF THE SOURCE, WE MUST MINIMIZE OR ELIMINATE AMMONIA, AND APPLY A TREATMENT PROGRAM CAPABLE OF PROVIDING TOTAL PROTECTION FOR THE COPPER ALLOY. ELIMINATION OF THE AMMONIA WILL BE PERFORMED THROUGH SIDE-STREAM ION EXCHANGE FILTRATION. THIS SYSTEM WILL BE INSTALLED ON YOUR CHILLED WATER SYSTEM FOR INITIAL AMMONIA REMOVAL, AND WILL REMAIN INSTALLED AS A BACK-UP FOR USE AS NEEDED (IF NEEDED), TO ENSURE TOTAL PROTECTION. - PRE-CLEANING THE CHILLED WATER SYSTEM WILL BE AN IMPORTANT FIRST STEP TO ENSURE CLEAN METAL SURFACES ARE AVAILABLE FOR CHEMICAL PASSIVATION. THE USE OF ACID HAS BEEN WIDELY USED, HOWEVER, THIS METHOD CAN DAMAGE DELICATE METALS IF NOT CONTROLLED PROPERLY. ALSO, THE USE OF ACIDS CAN RESULT IN 'ACID CONCENTRATION SITES' AND/OR 'ACID HIDE-OUT' . BOTH OF THESE CONDITIONS WOULD REQUIRE CAREFUL ACID NEUTRALIZATION WITH SODA ASH, AND AGAIN, THE USE OF SODA ASH IN A CLOSED WATER LOOP CAN HAVE SIMILAR, BUT OPPOSITE PROBLEMS. WE RECOMMEND USING AN ALKALINE 'BOIL-OUT' APPROACH WHICH UTILIZES HIGHLY ALKALINE COMPONENTS COUPLED WITH A CONTROLLED AMOUNT OF CHELATING AGENTS. THE CHELATING AGENTS ARE VERY EFFECTIVE IN REMOVING COPPER DEPOSITS AND RESTORING THE COPPER SURFACES TO CLEAN, TREATMENT READY, CONDITION. DURING THE CLEAN-UP CYCLE, pH WOULD BE HELD ABOVE 12.0 (FROM THE ALKALINE COMPONENTS), AND TOTAL CHELANT WOULD BE HELD AT A MAXIMUM OE' 20 PPM. - TREATMENT CONSIDERATION IS CRUCIAL. MOLYBDATE IS AN EXCELLENT CORROSION INHIBITOR FOR FERROUS METALS, HOWEVER, DOES NOT PROVIDE MUCH PROTECTION FOR COPPER ALLOYS. TOLYLTRIAZOLE IS EXCELLENT AS A COPPER ALLOY CORROSION INHIBITOR, AND USED IN CONJUNCTION WITH MOLYBDATE, WILL PROVIDE MOST OF THE NECESSARY METAL PROTECTION REQUIRED. MOLYBDATE SHOULD BE MAINTAINED AT A LEVEL OF 150 - 200 PPM (PARTS PER MILLION), THIS IS RELATIVELY STRAIGHT FORWARD. TOLYLTRIAZOLE HOWEVER, REQUIRES MUCH MORE CONSIDERATION WITH RESPECT TO APPLICATION AND ASSURED PERFORMANCE, (PLEASE REFER TO THE ATTACHED PAPER ON 'UNDERSTANDING COPPER CORROSION INHIBITION' ). SUFFICIENT TOLYLTRIAZOLE MUST BE FED INITIALLY TO SATISFY BOTH THE TOTAL COPPER SURFACE AREA, AS WELL AS ANY AND ALL SOLUBLE (OR POTENTIALLY SOLUBLE - DEPOSITS) COPPER IONS PRESENT IN THE BULK WATER OF THE CHILLED WATER SYSTEM. INITIAL TOLYLTRIAZOLE LEVEL REQUIREMENTS COULD BE AS HIGH AS 200 PPM (PARTS PER MILLION), WITH AN ULTIMATE RANGE OF 3 - 10 PPM, AS A MAINTENANCE PARAMETER. IT WILL BE CRITICAL TO FEED SUFFICIENT TTA INITIALLY TO BOTH REACT WITH ALL SOLUBLE COPPER IONS AS WELL AS COAT AND PASSIVATE ALL COPPER SURFACES. A FREE RESIDUAL OF TTA MUST ALWAYS BE AVAILABLE TO REBUILD THE TTA BARRIER FILM, AS THIS FILM WILL DEGRADE FROM ATTRITION. THE TREATMENT PROGRAM SHOULD .ALSO CONSIST OF PHOSPHONATES, TO PROMOTE CRYSTAL MODIFICATION OF PRECIPITATING SALTS, BUT MORE IMPORTANTLY, TO BENEFIT FROM THE REVERSION TO ORTHO-PHOSPHATE AND RESULTANT CORROSION PROTECTION AS GAMMA-IRON OXIDE. MAINTAINING CLEAN SURFACES WILL REQUIRE A SILT DISPERSANT (POLYMER), WE RECOMMEND A CO-POLYMER, AND A MICRO-BIOCIDE, TO CONTROL FILM FORMING SLIME. CITY OF PALM SPRING CONVENTION CENTER TREATMENT PROGRAM OUTLINE: Q]0 .TN r W R- SCALE AND CORROSION INHIBITOR: AMATROT W -90: AQUATROL WPC-90 SCALE AND CORROSION INHIBITOR CONTAINS MOLYBDATE AND TOLYLTRIAZOLE FOR CORROSION INHIBITION, AND CO-POLYMER/PHOSPHONATES FOR SCALE INHIBITION AND MILD DE-SCALING OF EXISTING DEPOSITS. MICRDBIOCIDE: AQUATROL - 780• AQUATROL C-2780 IS OUR MOST ,ADVANCED TECHNOLOGY BIOCIDE. BROMINE/CHLORINE PELLETS ARE RAPIDLY BECOMING THE BIOCIDE OF CHOICE DUE TO ITS SUPERIOR EFFECTIVENESS OVER A BROAD pH SPECTRUM. C-2780 PELLETS ARE FED VIA OUR SUPPLIED FEEDER SYSTEM TO INSURE CONTROLLED APPLICATION. HOT WATERLOO TOTAL TREATMENT CORROSION INHIBITOR: AQUATROL WPC-74: AQUATROL WPC-74 IS A SPECIAL BLEND OF TREATMENTS DESIGNED FOR THE CRITICAL NEEDS OF HOT WATER BOILER SYSTEMS. WPC-74 IS A BLEND OF TRADITIONAL NITRITE/ BORATE, WITH THE ADDED PROTECTION OF THERMALLY STABLE MOLYBDATE AND TOLYLTRIAZOLE AS CORROSION INHIBITORS. THIS IS THE VERY BEST TREATMENT COMBINATION AVAILABLE ANYWHERE FOR CLOSED HOT WATER SYSTEMS. CHILLED WATER LOOP AQUATROL -52,94 AQUATROL -1205• AQUATROT. T - 14g OUR COMBINED BLENDING OF CRITICAL COMPONENTS (MOLYBDATE, TOLYLTRIAZOLE, AND DISPERSANTS) CAN BE BEST ACHIEVED INITIALLY WITH A COMBINATION OF SPECIALTY CHEMICALS, EACH WITH ITS OWN UNIQUE CONTRIBUTION TO THE NEEDS OF YOUR SYSTEM. ONCE THE SYSTEM IS UNDER CONTROL, AND NORMAL CONTROL PARAMETERS CAN BE ESTABLISHED, WE WILL ALSO MAKE THE NECESSARY ADJUSTMENTS OF THE AQUATROL COMPONENTS LISTED ABOVE. INIT:ALLY, WE ARE LOOKING FOR MAXIMUM TREATMENT ADJUSTMENT FLEXIBILITY. THE ABOVE TREATMENTS CONTAIN MOLYBDATE, TOLYLTRIAZOLE, PHOSPHONATE BLEND, POLYMERS AND HYDROXIDE (FOR pH ADJUSTMENT). AQUATROL ALG::j AQUATROL ALG-400 IS OUR SELECTION OF BTDCIDE 10 BE USED ONLY AS NEEDED IN YOUR CHILLED WATER LOOP TO CONTROL FILM FORMING BIOLOGICAL SLIME. CITY OF PALM SPRINGS CONVENTION CENTER PERFORMANCE GUARANTEE AQUATROL PRODUCTS ARE GUARANTEED TO PERFORM AS SPECIFIED FOR THEIR DESIGNED USE AND APPLICATION. SHOULD ANY AQUATROL PRODUCT FAIL TO PERFORM AS SPECIFIED, AND IT IS DETERMINED THAT THE CAUSE OF FAILURE IS DUE TO LACK OF PERFORMANCE OF THE PRODUCT, AQUATROL WILL SUPPLY AT NO CHARGE THE NECESSARY CLEANING CHEMICALS TO RESTORE THE SYSTEM TO ITS ORIGINAL. CONDITION PRIOR TO THE INITIATION OF SAID TREATMENT. AQUATROL MAINTAINS A ONE MILLION DOLLAR GENERAL AGGREGATE INSURANCE LIABILITY TO PROTECT OUR CLIENTS FROM DAMAGE WHICH MAY RESULT FROM IMPROPER TREATMENT APPLICATION OR PERFORMANCE. IN ORDER TO ENSURE AGAINST ANY POTENTIAL PROBLEM SITUATIONS, AQUATROL WILL OBTAIN ADDITIONAL SYSTEM WATER SAMPLES, (OVER AND ABOVE OUR MONTHLY FIELD TESTING), FOR SUBMITTLE TO OUR LABORATORY FOR A COMPLETE ION ANALYSIS. PLEASE BE ASSURED THAT OUR PERFORMANCE GUARANTEE WILL BE UPHELD, HOWEVER, WE CANNOT BE RESPONSIBLE FOR UNSEEN DAMAGE WHICH MAY HAVE AREADY OCCURRED PRIOR TO OUR INVOLEMENT AND WHICH MAY NOT HAVE ALREADY SURFACED. WE FEEL CONFIDENT IN OUR ABILITY TO STOP ANY FURTHER DAMAGE TO YOUR OPERATING EQUIPMENT, AND IN SOME INSTANCES, WE MAY BE ABLE TO REVERSE SOME OF THE DAMAGE ALREADY PRESENT. CITY OF PALM SPRINGS CONVENTION CENTER SERVICE PROGRAM: Our normal service call frequency is once per month, twelve visits per year. We will provide what-ever man power is needed during the initial training and start-up period to insure a smooth transition. Most imt)ortantly, we are always on call to provide you with emergency service when-ever the need occurs Our typical emergency response time is four hours. Service is an important part of the Aquatrol program, and we encourage our customers to get us involved in their operation. Close and concise monitoring each month along with written service reports will insure optimum system performance. Aquatrol is committed to performance. The key to our years of success can be attributed to our direct involvement in the monitoring of critical system parameters throuchout our customers facilities. It is that total commitment to service that alerts us to any potential situation which could hamper performance or cause damage to the operating equipment. As part of our normal service commitment, we will provide complete operator/engineer training on our treatment programs as well as instruction on safe material handling (In compliance with OSHA "Right to Know"laws). Complete Program control notebooks will also be provided for both operating engineers and management. We will be available for equipment inspections when-ever they occur, and written inspection reports will follow. Moreover, we will provide program performance reviews at whatever frequency is appropriate. AQUATROL PROGRAMS ARE PERFORMANCE GUARANTEED! THE NAME AQUATROL IS SYNONYMOUS WITH SERVICE AND PERFORMANCE ! ! ! UNDERSTANDING COPPER CORROSION INHIBITION I. OVERVIEW The observed behavior of TTA or BZT, two widely used copper corrosion inhibitors, as a function of pH can be understood on the basis of its structure. Probably the most critical control feature in a cooling tower will be pH. If too low, inhibition activity will be depressed because of the induced shift in the position of equilibrium resulting in a lower concentration of the active form. Of course, if the azole is intercepted before it can reach the surface of the metal no inhibition activity will be ob- tained. The presence of Cu+2 ions in the recirculating water can be a serious source of interference. If azole is being fed when sampling for Cu+2 is attempted, the copper may not be observed since it: may have settled out as the azole complex or the azole may interfere with the copper analysis . II . CHEMISTRY The structure of TTA and BZT is M 3 d \ 7 ' In BZT R = H and for TTA. R = CH3 . Ycyc c Counting the double bonds we see that there are four of them alternating with single bonds . The number of pi-electrons (those in the double bond) is eight ( 4 bonds x 2 e per bond) . It is known (and is theoretically provable ) that if a series of conjugated double bonds (alternating single and double bonds ) containing 4 n + 2 pi-electrons (n = 0, 1 , 2, 3 , . . . ) is arranged in a cycle molecule an exceptioanlly high degree of stability is conferred upon the molecule. Benzene ( 6 pi- electrons = 4 x 1 + 2 ) is the key example of this effect. The property is often referred to as "aromaticity" If the hydrogen on the N1 atom of the azole is removed as H+ (leaving behind 2 electron in a pi-orbital ) the BZT (or TTA) molecule will gain this "aromatic" structure. This is a key to understanding the chemistry of these molecules. BZT and TTA, despite their amine character, are acids rather than bases . This is a result of the "driving force" of the aromatic structure which is gained upon deprotonation (re- moval of H+) . III . COPPER INHIBITION The azoles inhibit the cathodic reaction on copper by forming a very thin film ( 10-100 A) on the metal . The film is a true con 't III page 3 • � ` chemi-sorbed film, involving direct bonding of the azole to the copper. A variety of experiments have shown that the structure of the film involves bonding of one azole to two copper atoms via N1 , N;� , and N3 , while each copper atom is bonded to two azole molecules to form a polymeric network: Itv/ I. A critical feature to be noticed is that the hydrogen atom at N1 is missing. This has been established unequivocally by infrared analysis of thin films. The copper is in the +1 oxidation state. In systems where oxygen is absent it is likely that azole--copper films will not form, or only form to a small extent . We have observed such behavior in some beaker tests where oxygen was removed and film forma- tion was then incomplete. IV. THEORIES Most likely, the active species in film formation is the deprotonated form. The undissociated acid would lack the coti ' t IV page 4 necessary geometry to form a strong bond . However, it is possible that the neutral molecule is first adsorbed onto the copper and then deprotonates as the azole-copper bond is formed. This is not a highly probable mechanism, however. TTA is a week acid despite the aromatic character; in fact , at pH 7 only about 4% of the azole in solution is deprotonated. From the dissociation equilibrum 7'7A TTA-v& Ht• [7TA] &16 [T TA] For every change in pH of one unit the concentration of TTA- changes by a factor of almost ten . As pH decreases ( increased rHj ) the concentration of TTA- also decreases. At ph 6 only about 0. 38% is dissociated (and at pH 5 only about 0. 04 ) . This can help to explain some experimental results. If a system is treated at pH 7 and then lowered to pH 6 corrosion rates are fairly low. If , however , the treatment is started at pH 6 no protection is established. At pH 6, perhaps, not enough TTA is present in the active form (0. 38%) to build a film faster than it will degrade. Simply increasing the feedrate may not be -the answer. i • REACTIONS IN SOLUTION In section III the nature of the azole-copper film was dis- cussed. This film was a copper (I )-azole arising from re- action of the azole anion (probably) with the thin cuprous oxide (CU20) film present at the metal-solution boundary. An important question to ask is what other reactions might the .azole undergo which would compete with the film-forming reaction. The soluble copper species present in recircula- ting water in contact with a corroding copper alloy will be Copper II , the cupric ion. This ion also forms an insoluble complex with TTA or BZT. The exact nature of the complex is not known , but appears to involve a ratio of Cu+2: azole of one-to-one on a molar basis. On a ppm basis this would mean that one ppm of Cu+2 would react with about 2 ppm of TTA or 1 . 8 ppm of BZT. This complex is insoluble and is not protec- tive since it forms in the bulk water as a precipitate. The stability of the complex is pH dependent, being large at pH 7 and vanishingly small at pH 4 . Alternatively, the TTA (or BZT) anion must compete with hydroxide for the Copper II ions (Kstab for CuOH2 is about 1012 ) . Another complicating factor is kinetic vs thermodynamic stability. In laboratory tests carried out at higher azole concentrations (about 5000 ppm) the copper-azole complex preferentially forms at pH 7. How- ever, at treatment levels ( 3 ppm) the species that forms will be mostly determined by the difference in stability constants of the hydroxide vs the azole complex. con 't Reactions in Solution page 6 What makes this issue crucial is the question of what happens to the active azole in a system containing Cu+2 ions . If the azole complex is as stable or more stable than the hydroxide then at near neutral pH' s 'the active azole will be removed from the system. The result will be a vicious circle of loss of azole: increased cropper corrosion: increased Cu+2 ions in solution: increased loss of azole, ad infinitum. Unless a reasonable level of active azole ( 2-3 ppm) can be established the system will be out: of control.