P.E. 4-1,000,000 12, 2014 (270) C

Transcription

1 111 Fifth Street Henderson, KY March 12, 2014 Mr. Tom Williams, P.E. General Manager (270) Job No C If you would like to speak with Patrick Heltsley concerning this report, call (270) , Ext 253 For additional copies of this report call (270) Ext. 253

2 Photo shows the condition of 1 of the 9 foundations. AWWA D100-11; : Foundations states "The top of the piers shall be 6" above the finished grade." We recommend clearing any dirt, debris and other loose gravel away from the tank foundations, down to a minimum 6 below top of foundations. 2

3 Photo shows the condition of the foundation. We recommend repairing any cracks and spalling in the concrete and grout beneath the plates with a commercial non-shrinking grout. We further recommend sealing the foundation piers with a sealant. 3

4 Photo shows 1 out of 9 piers, which appears to be in good condition. We recommend the tank be electrically grounded for lightning protection as required by OSHA 29 CFR 1926, Subpart K. 4

5 Photos show the condition of 1 of 22 anchor bolts. The structural integrity of the anchor bolts should be maintained to withstand 100 m.p.h. winds blowing from any direction as required by AWWA D100-11; 3.8: Foundation bolts. We recommend cleaning the area around the anchor bolts, tightening the anchor bolt nuts to specifications and tack weld the bolt to nut and nut to base plate connections to prevent from loosening. We further recommend touching up areas effected by repair process. 5

6 Photos show more of the condition of the anchor bolts. Minor surface rust is present on a few of them. 6

7 Photo shows the base of the riser pipe. Currently there is no riser drain valve. A drain valve performs two functions it allows the tank to be drained and it is used as a blowout to remove silt and scale from the lower portion of the tank. We recommend installing a frost proof drain valve, complete with locking device to prevent unauthorized draining of the tank and a splash pad to direct water away from the foundation. 7

8 Photo shows the tank name plate, which appears to be in good condition. 8

9 Photos show the condition of the 18 riser manway. This manway would restrict entry in an emergency. We recommend replacing the existing riser manway with an TSS; 7.0.8: Access, AWWA D100-11: approved 30" manway, complete with a hinge, a Confined Space Entry sign and maintenance free galvanized steel bolts. As an alternative option, we recommend installing a davit arm. 9

10 Photos show the condition of the 8 overflow pipe system. To bring overflow in compliance with TSS; 7.0.7: Overflow (B) states, The overflow shall be screened with a twenty-four mesh non-corrodible screen. The screen shall be installed within the overflow pipe at a location least susceptible to damage by vandalism. Notice a twenty-four mesh is not present and is allowing ingress of insects. We recommend to install a screen as preventive maintenance and paint overflow where needed. 10

11 Photo shows the condition of the tower access ladder. We recommend cutting the ladder at the point of deflection, realigning ladder and then reconnecting ladder by welding. 11

12 The tower access ladder in above photos is 16 wide. The following is required to bring the ladder in compliance with TSS; : Safety, AWWA D100-11; : Ladders. We recommend an aluminum lockable ladder guard to prevent unauthorized access. We further recommend posting a Fall Protection Required sign to bring the ladder into compliance with OSHA (a) 12

13 Photos show the condition of the windage rods. The windage rods are in tune and are properly adjusted. 13

14 Photo shows the condition of the strut end connections. The strut ends have been seal welded and appear to be in good condition. 14

15 Photo shows the sections of the riser pipe and riser cone and bowl. The riser stay rods are in good condition and properly adjusted. 15

16 Photos show the condition of the existing handrail system, which is in good condition and is in compliance with OSHA 29 CFR (e)(1). We recommend installing a stainless steel chain gate at the top and intermediate rail openings at the junction of the tower access ladder and structural girder as required by OSHA 29 CFR (e)(1). 16

17 Photos show the condition of the balcony floor. The arrows are pointing to show where water is ponding, causing deterioration of the paint and steel. We recommend drilling additional weep holes in the balcony floor to prevent ponding of water. 17

18 Photo shows the condition of the existing 24 shell manway. The following items are required to bring the tank into compliance with TSS; 7.0.8: Access and OSHA : General requirements. We recommend : Install 30'' secondary shell manway 180º from primary manway Install davit slide on both shell manways Post Confined Space Entry signs 18

19 Photo shows the posthead connections, which appear to be in good condition. 19

20 Shell/roof access ladder in above photos is equipped with anti-skid rungs and is 16'' wide. Notice the missing safety climb. TSS; : Safety and OSHA Ladders states: "Minimum clear distance between the sides of individual rung/step ladders and between the side rails of other fixed ladders must be 16 inches (41 cm)." We recommend installing a cable type ladder safety device. 20

21 Photo shows more of the condition of the existing 16 wide shell/roof access ladder. Safe climbing procedure requires a person to climb a ladder with their hands on the side rails of the ladder and not the ladder rungs. Notice a coax is mounted on the ladder side rail, creating a climbing safety hazard. We recommend removing the coax from the ladder and securing it, with standoffs to the tank shell to eliminate this climbing safety hazard. 21

22 Photos show that the tank roof is not equipped with a required fall protection system. OSHA Subpart c requires fall protection on the edges of all walking working surfaces. We recommend installing a 42" high handrail system around the circumference of the tank roof, complete with toeboard, intermediate rail and a stainless steel gate chain at the junction of the shell-to-roof access ladder and tank roof. 22

23 Photo shows the condition of the 24 primary manway. Roof openings on this tank require the following to be in compliance with TSS; 7.0.8: Access, OSHA 29 CFR (a)(1) and AWWA D : roof openings. We recommend: Post Confined Space Entry sign Install new lock on existing manway 23

24 Photo shows the condition of the 24 secondary roof manway. Roof openings on this tank require the following to be in compliance with TSS; 7.0.8: Access, OSHA 29 CFR (a)(1) and AWWA D : roof openings. We recommend: Replace 24 secondary roof manway with a 30 manway Post Confined Space Entry sign 24

25 Photos show the condition of the existing 24 roof vent. TSS; 7.0.9: Access and AWWA D100-11; 5.5.2: Screening states, "When the vent is provided with screening against insects, a pressure-vacuum screened vent or a separate pressure-vacuum relief mechanism shall be provided that will operate in the event that the screens frost over or become clogged." An improperly vented tank may cause external pressure to act on the tank which can cause buckling even at low pressure differential. We recommend replacing the existing roof vent with a 24 vacuum-pressure, frost proof vent and screen. 25

26 Photos show the tank is equipped with a sonar liquid level indicator, which appears to be in good condition. 26

27 Photos show the tank exterior coating system, which is estimated at 1%- 2% paint failure with very minimal areas of rust.. We recommend pressure washing the tank exterior with (minimum 3,500 psi at 3.0 gpm), then remove all loose rust and scale with wire brushes and hand scrapers in accordance with SSPC#2 (hand tool cleaning) and touch up paint on flaky areas to prolong the life of the tank. 27

28 Photos show more of the tank exterior coating system. 28

29 Photos show more of the tank exterior coating system. 29

30 Photos show more of the tank exterior coating system. 30

31 Photos show more of the tank exterior coating system. 31

32 Photos show more of the tank exterior coating system. 32

33 Photos show the condition of the interior roof. Notice the rust forming at the roof lap seams. We recommend seam sealing using Sikaflex 1a on all un-welded interior roof lap seams to prevent failure of the interior liner. 33

34 Interior access ladder in above photo is equipped with anti-skid rungs and is 16 wide. TSS; : Ladders and OSHA 29 CFR states: "Rungs must be corrugated, knurled, dimpled, coated with skid-resistant material or treated to minimize slipping " We recommend installing a stainless steel cable type ladder safety device. 34

35 Interior bowl ladder in above photo is equipped with anti-skid rungs and is 16 wide. To be in compliance with TSS; : Ladders and OSHA 29 CFR We recommend installing a stainless steel cable type ladder safety device. 35

36 Photo shows the bowl to riser access ladder is 16 wide and is equipped with anti-skid. To be in compliance with TSS; : Ladders and OSHA 29 CFR We recommend installing a cable type ladder safety device. 36

37 Above photo shows before the clean out was preformed. Bottom photo shows after clean out was preformed. We also recommend installing a passive cathodic protection system on the interior of the tank. 37

38 Photo shows the riser access ladder is 16 wide and is equipped with anti-skid rungs. To be in compliance with OSHA 29 CFR We recommend installing a cable type ladder safety device. 38

39 Photos show riser opening is not equipped with handrails as required by OSHA (c)(1). We recommend installing an OSHA approved 42 high handrail system around the circumference of the riser to bowl opening, complete with intermediate rail and toeboard. We further recommend to remove the safety grating in accordance with installing handrails around riser to bowl opening. 39

40 Photo shows a fill pipe on the tank interior. A temperature difference between the water in the top and bottom of a tank, even as little as 1-2 degrees Fahrenheit, is an indication of thermal stratification, and the tank water not completely mixed. Incomplete mixing would result in short-circuiting and localized increase in water age would develop inside the tank. This typically leads to water quality problems, such as loss of residual, DBP spikes, HPC spikes, bacteria regrowth, formation of biofilm, changes in ph and dissolved oxygen. We recommend installing a mixing system. 40

41 Photo shows the tank is not equipped with a syphon line, to drain the remaining water out of the lower portion of the bowl. We recommend installing a 2 syphon line in the riser. 41

42 Photos show the interior coating system, which is at 10% - 15% paint failure. We recommend sandblasting all rusted and abraded areas of the tank interior to an SSPC #10 (near white blast) condition, brush blast all remaining areas, stripe coat all seams and welds, then apply an epoxy liner to achieve 8-10 mils of dry film thickness. 42

43 Photos show more of the interior coating system. 43

44 Photos show more of the interior coating system. 44

45 Photos show more of the interior coating system. 45

46 Photos show more of the interior coating system. 46

47 ELEVATED TANK INSPECTION REPORT JOB NO: C INSPECTOR: Levi Marez (WG) TANK OWNER: OWNER S REPRESENTATIVE: TITLE: Henderson Water Utility General Manager Mr. Tom Williams, P.E. MAILING ADDRESS: 111 Fifth Street Henderson, KY PHYSICAL ADDRESS: 111 Fifth Street Henderson, KY CITY, STATE: Henderson, KY ZIP: COUNTY: Henderson County TELEPHONE: (270) FA: (270) LOCATION OF TANK: williamst@hkywater.org 4- Star Tank Henderson Water Utility 111 Fifth Street Henderson, KY March 12, 2014 Mr. Tom Williams, P.E. General Manager (270) ORIGINAL CONTRACT NO: 5818 YEAR BUILT: 2003 ORIGINAL MANUFACTURER: PT & T CAPACITY: 1,000,000 Gallon DATE OF LAST INSPECTION: Unknown TYPE: Potable DIAMETER: 70-0 HIGH WATER LEVEL: LOW WATER LEVEL: HEAD RANGE: 40-0 TYPE CONSTRUCTION: WELDED: RIVETED: BOLTED: ACCOUNT EECUTIVE: Vicky Caudill

48 Exterior Interior Lead Check Negative Negative Adhesion Mil Thickness Reading Henderson Water Utility- C 48

49 Page # Work Proposed Critical Deficiency NON-Critical Deficiency OSHA Structural Preventive Maintenance 2 Clear any dirt, debris and other loose gravel away from the tank foundation, down to a minimum 6" below top of foundations. 3 Repair any cracks and spalling in the concrete and grout beneath the plates with a commercial non-shrinking grout. Seal the foundation piers with a sealant. 4 Electrica lly ground the tank for lightning protection. 5 7 Clean the area around the anchor bolts and tighten the anchor bolt nuts to specifications, then tack weld around the circumference of the bolt-to-nut and nut-to-base plate connections to to prevent from loos ening. Touch up areas effected by repair process. Install a frost-proof drain valve complete with locking device to prevent unauthorized draining of the tank and a splash pad to direct water away from the foundation. Replace the existing 18" riser manway with a 30" riser manway Install hinge on manway. Post Confined Space Entry sign. Install maintenance free galvanized steel bolts. Alternative option, install a davit arm Install a screen on the overflow pipe as preventive maintenance Pa int overflow where needed. Cut the ladder at the point of deflection, realign ladder and then reconnect la dder by welding. Install an aluminum ladder guard at the tower access ladder Pos t Fall Protection Required s ign. Install a stainless steel chain gate at the top and intermediate rail openings at the junction of the tower access ladder and s tructura l girder. Drill additional weep holes in the balcony floor to prevent ponding of water. 18 Install 30" secondary shell manway 180º from primary manway. Install davit slides on both shell manways. Post Confined Space Entry signs. Henderson Water Utility- C 49

50 Page # Work Proposed Critical Deficiency NON-Critical Deficiency OSHA Structural Preventive Maintenance Install a cable type ladder safety device at shell/roof access la dder. Remove the coax from the shell/roof access ladder and secure it with standoffs to the tank shell to eliminate this climbing safety hazard. Install a 42" high handrail system around the circumference of the tank roof, complete with toeboard, intermediate rail and a stainless steel gate chain at the junction of the shell-to-roof access ladder and tank roof. Post Confined Space Entry sign at primary roof manway. Install new lock on existing manway. Replace 24 secondary roof manway with a 30 manway. Post Confined Space Entry sign. Replace the existing roof vent with a 24" vacuum-pressure, frost proof vent and screen. Pressure wash the tank exterior with (minimum 3,500 psi at 3.0 gpm), then remove all loose rust and scale with wire brushes and hand scrapers in accordance with SSPC#2 (hand tool cleaning) and touch up paint on flaky areas to prolong the life of the tank. Seam sealing using Sikaflex 1a on all un-welded interior roof lap seams. Install a stainless steel cabel type ladder safety device on the interior a cces s la dder. Install a stainless steel cabel type ladder safety device on the interior bowl la dder. Install a stainless steel cable type ladder safety device on the bowl to riser access ladder. Install a passive cathodic protection system on the interior of the tank. 38 Install a cable type ladder safety device on riser access ladder. 39 Install an approved 42 high handrail system around the circumference of the riser opening, complete with intermediate rail and toeboard. Remove the safety grating. 40 Install a mixing system. 41 Install a 2 syphon line in the riser. 42 Sandblast all rusted and abraded areas of the tank interior to an SSPC #10 (near white blast) condition, brush blast all remaining areas, stripe coat all seams and welds, then apply an epoxy liner to achieve 8-10 mils of dry film thickness. Henderson Water Utility- C 50