N-1Redacted Work Order 4/30/2010
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Coon Pond Pipeline Replacement Reference Notes Budget Year 2010 Division Power Production Department Hydro Date March 10th CI number 33942 per the attached quote from limited a total of has been allotted for Materials. Note 2 Contracts Ple...
AI summary The document outlines reference notes for the Coon Pond Pipeline Replacement project under the Power Production division of Hydro in 2010. It includes details on contracts, excavation, site drainage, and contingency planning, based on NSPI experience with similar projects.
Pipe replacement Vs. Do nothing ement Vs. Do noth 2020 364,995.6 (60,949.7) - 205,516.0 2,979,051.6 304,045.9 (30,544.3) 0.530 145,019.2 (829,365.7)
AI summary The text presents a table with numerical data related to a pipe replacement versus a do-nothing scenario, likely from a regulatory proceeding. The context suggests a cost-benefit analysis is being evaluated, possibly involving infrastructure planning and capital expenditures.
Rand and Pine Replacement Vs. Do nothing Band and l Pipe Replacement \ 2047 - - • 51,908.5 - 16,091.6 16,091.6 0.090 1,444.0 (26,357.8) (26,913.8) 2048 - - - 48,794.0 - 15,126.1 15,126.1 0.084 1,273.9 (25,639.9) 2049 - - - 45,866.3 764,439...
AI summary The document presents a comparison between the Rand and Pine Replacement program and a 'do nothing' approach, with tables showing various metrics and figures for different years, including costs, interest, and other financial data. The table includes some unclear or incomplete entries, and there are mentions of names and numbers that may relate to legal or regulatory matters.
Nova Scotia Utility and Review Board Mailing address PO Box 1692, Unit "M" Halifax, Nova Scotia B3J 3S3\[email protected] Web www.nsuarb.ca Office 3rd Floor 1601 Lower Water Street Halifax, Nova Scotia B3J 3P6 902 424-4448 t 902 424-39...
AI summary The Nova Scotia Utility and Review Board has approved NSPI's request for approval of a U&U Work Order for the replacement of the Coon Pond Pipeline, valued at $629,936. The replacement is necessary to repair damage and allow the Mill Lake Plant Generating Station to resume operations, with a full replacement planned for 2014.
RECEIVED NOV 2 5 2833 Nova Scotia Utility and Review Board Submitted on behalf of NOVA SCOTIA POWER INCORPORATED Approved on behalf of NOVA SCOTIA UTILITY AND REVIEW BOARD Peter W. Gurnham, Q.C. Authorized Signatory Rick Janega Executive V...
AI summary The document outlines a submission related to the U&U Coon Pond Pipeline Replacement project, submitted on behalf of Nova Scotia Power Incorporated and approved by the Nova Scotia Utility and Review Board. It includes details such as the CI Number, Project Number, and Cost Centre associated with the project.
Why do this project? A blowout occurred in the woodstave pipe, and the pipe cannot be watered up until this blowout is repaired and the integrity of the rest of the woodstave pipe improved. At our request following the most recent blow-out...
AI summary A blowout occurred in a woodstave pipe, requiring repairs and improvements to ensure its integrity. Can bar, an industry leader, inspected the pipe and reported that while the staves are in fair condition, the penstock is in fair-poor condition and requires rehabilitation to ensure safe operation.
N-3Responses to Second Set of Information Requests 7/28/2010
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COON POND PIPELINE REPLACEMENT Summary of Alternatives Rudge t Year : 2010 Date : 15. Jul-10
AI summary The document provides a summary of alternatives for the Coon Pond Pipeline Replacement, with a focus on the year 2010 and the date July 15, 2010. It outlines key considerations for the replacement project.
NON-CONFIDENTIAL 1 Request IR-9: 2 3 On November 30, 2007 the Board approved NSPI's request to replace 700 ft of the pipeline 4 based on the information that the remaining 2,750 ft needs to be replaced in 2017. In 2008 5 NSPI requested Boa...
AI summary NSPI requested pipeline replacement in 2007 and 2008, with the replacement date accelerated from 2017 to 2014 and then to 2010. The response refers to a 1998 Canbar Report stating the penstock was in fair condition and could last several more years if maintained properly.
PURPOSE OF INSPECTION: Perfonn external inspection to detennine and COlmnent on the general condition of the pipeline, repair methods being used, problem areas and maintenance requirements.
AI summary The purpose of the inspection is to assess the general condition of the pipeline, evaluate the repair methods being used, identify problem areas, and determine maintenance requirements.
Pipe was rebuilt over 7 years in sections according to the following schedule: Length Rebuilt Powerhouse to surge tank 0' (surge tank) to 524' 524' to 1100' llOO' to 2000' 2000' to 2625' 2625' to dam INSPECTION PROCEDURE:
AI summary The text outlines the schedule for the rebuilding of a pipe over a 7-year period in sections, followed by a heading indicating an inspection procedure.
Band corrosion is considerable in several locations noted, according to the following table. Station/Location Measured Board Dia. Observation 535' 0.625-0 .718" 17% dia. and 31 % strength reduction 425' 0.495-0 .500 34% dia. and 44% streng...
AI summary The document highlights significant band corrosion at various locations, with reductions in diameter and strength, and notes that several bands are bent and out of position at specific points along the structure.
STAVES Staves are generally in satisfactory condition throughout the line. However, the staves are Red Pine with CCA pressure treating rather than Douglas Fir with creosote pressure treating and resulting expected life will not be the gene...
AI summary The staves used in the pipeline are Red Pine with CCA pressure treating, which have a shorter expected lifespan than Douglas Fir with creosote. Poor quality staves, including porous wood and rough surfaces, have been identified, leading to potential leaks and premature delamination. Photos show rusted Kelsey Butts, leaks, and sections of the pipe requiring preservation treatment.
CRADLES The cradles are strut type timber cradles, creosote pressure treated. Some cradles have split filler sections as can be seen in Photo 18(27/4). The reduced structure of these cradles would enable more distortion likely resulting in...
AI summary The document discusses the condition of strut type timber cradles, noting that some have split filler sections, leading to potential distortion, stave crushing, and leaks. It recommends replacing deteriorated components and improving drainage to prevent water accumulation and further damage.
RECOMMENDA nONS - 1) All bands that are discOlmected, missing or partially disengaged must be recOlmected, replaced or properly seated to ensure that the band system renders the penstock safe with lower likelihood of blowout occurring. In...
AI summary The document provides recommendations for maintaining and repairing a penstock to ensure safety and longevity. Key actions include reconnecting or replacing corroded bands, refurbishing cradles, managing leaks, re-coating the penstock with preservatives, and maintaining drainage and vegetation control around the pipe.
Addendum to Coon Pond Inspection Report Subsequent to the inspection on July 27-31,1 998 a blowout occurred on the moming of August 3, 1998 at about 5:30 a.m. This blowout occurred at approximately 200-225' upstream of the surge tank, pred...
AI summary An addendum to the Coon Pond Inspection Report details a blowout incident on August 3, 1998, caused by a butt failure at a location with previously substandard repairs. The incident damaged infrastructure, including trees, cradles, and an FRP pipe. NSPI found similar substandard wood used in repairs at other penstocks, emphasizing the need for close monitoring.
PURPOSE OF INSPECTION: Perform external penstock inspection to determine cause(s) of blowout and implosion, and comment on the general condition of the pipeline, repair methods being used, problem areas and maintenance requirements.
AI summary The purpose of the inspection is to examine the external penstock for the cause of blowout and implosion, assess the pipeline's general condition, evaluate repair methods, identify problem areas, and determine maintenance requirements.
YEAR INSTALLED: Pipe was rebuilt in wood over a seven (7) year span in sections, and recently with Sclair pipe on downstream end, according to the following schedule: Construction Year Length Rebuilt 1989 Powerhouse to surge tank 1990 0' (...
AI summary The text details the timeline and construction phases of pipe rebuilding over a seven-year period, including the use of HDPE (Sclair) pipe and steel pipe reducers in 2007. It outlines the sections of the pipe rebuilt each year and the materials used.
The inspection was primarily visual with some photos being taken to show various conditions of the wood and steel components; some bands were measured for remaining diameter resulting from corrosion. The exterior of the wood penstock and i...
AI summary A visual inspection of wood and steel components, including the wood penstock and its supports, was conducted along the 9:00 (road) side. Photos and measurements of corroded bands were taken to assess conditions.
OBSERVATIONS AND DISCUSSION: Observations are described and referenced according to length measurements or cradle counts from the wood-plastic transition thimble. Observations around the circumference are referenced according to a 12 hour...
AI summary The document discusses the failure of a wood-plastic transition thimble in a penstock, leading to a blowout and collapse. Canbar was called in to inspect and recommend repairs. The report references prior inspection notes and a 1998 inspection report.
BANDS Two different size bands are used on this penstock: 3/4" diameter from the wood-plastic transition to 2258', and 5/8" diameter from 2258' to the dam. There are numerous bands with nuts and/or button heads that are working their way o...
AI summary The document describes the condition of bands on a penstock, noting two different sizes and the presence of corrosion and wear. It highlights concerns with older pipe shoes lacking keepers, the need for regular inspections, and the significant reduction in band strength due to corrosion.
CRADLES AND SUPPORT The bed has been washed away for 6-7 cradle spans in the vicinity of and from the blowout resulting in seven cradles either partially or fully undermined and unsupported, and displaced. Refer to Photos CP-12 to CP-16. R...
AI summary The document describes damage to cradles supporting a pipe, with six to seven cradle spans washed away, leading to partial or full undermining. It outlines necessary actions such as re-establishing drainage, realigning cradles, excavating between cradles for air circulation, and improving drainage to prevent pipe settling and stress.
RECOMMENDATIONS: - 1) Reinstate drainage, rebuild the bed and reinstall the cradles to the proper pipe alignment in the area of the blowout. - 2) Repair blowout section of pipe. - 3) Repair collapsed section of pipe. - 4) Replace all bands...
AI summary The document outlines a series of recommendations for the repair and maintenance of a penstock at the Coon Pond, Mill Lake Development site. These recommendations focus on reinstating drainage, repairing damaged sections, replacing bands, and applying preservatives to ensure the penstock remains in a safe operating condition for several more years.
Design Calculations Cover Sheet File No. : S7,77 - CP-P-CA L= 2008-01 1 Project No. : Project No.: Hydro System : St. Mara aret's Ba ⊶ Subject: Coon Pon Discipline: Civil Prepared By: Date: Re 8/0X Checked By: Date: 7-1 Calculation De escr...
AI summary The document is a design calculations cover sheet for a civil engineering project related to the replacement of steel bands on a pipeline in the St. Mara hydro system. It includes project details, dates, and design specifications, and was filed with the Utility and Review Board on July 28, 2010.
Full supply level (tt): IDF water level (tt): Inside radius of pipe (inches): Upsurge (%) 254.90 258.80 36 40 _ 1-to Uneurge /#\ Internal Design H lead (ft) Cut Ti read Band I Diameter ( (inches) Rolled Thread Band Diam Woodstave pipe 13+0...
AI summary The text contains technical specifications related to pipe dimensions, water levels, and design parameters, likely associated with infrastructure planning or utility projects. It includes measurements such as full supply level, IDF water level, inside radius of the pipe, and upsurge percentage, along with associated design parameters.
hitto://www.nicceem Size Major Dia Threads Per Inch Pitch Dia Minor Dia External a Minor Dia Internal b Minor Dia Area Tensile Stress Area 1¾ 1.75 5 1.6201 1.5119 1.5335 1.74 1.9 2 2 4 1.8557 1.7353 1.7594 2.3 2.5 21/4 2.25 4 2.1057 1.9853...
AI summary The text contains a table with technical specifications for pipe sizes and materials, along with project details for the Coon Pond Pipeline. It includes information about steel bands, wood staves, and design parameters, as well as a filing date and a reference to a design guideline.