Copper naphthenate treatment for wood crossties and timbers. J Brient, Nisus Corporation IRG/WP

Transcription

1 Copper naphthenate treatment for wood crossties and timbers J Brient, Nisus Corporation IRG/WP

2 Copper Naphthenate CuN is a heavy duty wood preservative Crossties and bridge timbers Utility poles Posts, piles, cross arms, etc. Copper compounds Broadly effective against decay fungi and wood-destroying insects Relatively easy to formulate Easy to assay and detect for penetration in wood

3 Short-line Treated by Cahaba

4 CuN History First suggested as a wood preservative in Europe in Creosote extender during World War II. Listed in AWPA Standards specifically for crossties and switchties & other treated wood commodities. Listed in American Railway Engineering and Maintenance-of-Way Association (AREMA) guidelines Class 1 railroads in the USA have incorporated CuN into their specifications for treated wood crossties and timbers. Field treatment of poles and ties Non-restricted wood preservative available for consumer use in the USA due to its low hazardous characteristics.

5 Clean to Work With Creosote Bleeding (Courtesy Wheeler Lumber) 5

6 Treated Wood Properties Not Conductive Not corrosive (mpy)

7 (courtesy Dr. Amburgey MSU) 7

8 CuN Efficacy 13 years in track No significant difference in performance NS RR - major commitment to CuN Average Rating (10 = Excellent) AD Creosote AD CuNap Borates + CuNap Borates only Borates + Creosote Boultonized CuNap Boultonized Creosote* TVA hardwood posts Cold soak (non-pt) 0.03 pcf Cu Wood Species Untreated, years CuN-treated, years Southern Pine Black Oak Yellow Poplar Blackgum Red Maple Chestnut Oak White Oak

9 Based on Decades of Field Tests: 0.06 pcf Cu = 10 pcf Creosote 0.04 pcf Cu = 8 pcf Creosote 0.03 pcf Cu = 6 pcf Creosote 9

10 CuNap CuNap TIES GOING IN IN 10

11 U1-13 USE CATEGORY SYSTEM: USER SPECIFICATION FOR TREATED WOOD PRESERVATIVE RETENTION SPECIFICATIONS (Crossties and Switchties) UC4A, UC4B, UC4C Retentions in English (pcf) units Use Category System Retention Specification by Gauge (pcf). (UC4A, UC4B and UC4C) Creosote Cu Naphthenate 1 SBX Pre- Treatment 2 Species CR CR-S, CR-PS CuN SBX 3 Oak and Hickory 7.0 or 7.0 or or Refusal Refusal Refusal 0.17 Mixed Hardwoods Southern and Ponderosa Pine Coastal Douglas-fir, 8.0 or Western Hemlock, 8.0 Refusal Western Larch # Intermountain Douglas-fir Refusal Refusal # # Jack, Red & Lodgepole Pine # # Footnotes: 1 May also be determined by assay. 2 SBX pre-treated ties shall be secondarily treated with CR, CR-S, CR-PS, or CuN (for which data is submitted) for this commodity at the retention shown above. 3 The only acceptable formulation of SBX for pre-treatment of this commodity is sodium octaborate (DOT) since all supporting data is based on DOT at 0.25 pcf (4.0 kg/m 3 ) which is equivalent to 0.17 pcf (2.7 kg/m 3 ) B 2 O 3 (SBX). # = Either no proposal for standardization and/or data demonstrating efficacy of a preservative/species combination has been submitted to AWPA; or the use of the preservative/species combination has been proven ineffective. 11

12 AREMA COMMITTEE 30 Ties Copper Naphthenate - Ballot Approved Guidelines & Recommendations Part 3 Solid Sawn Timber Ties, Section 3.6 Wood Preserving, Oil-Borne Preservatives Copper Naphthenate (CuN) is an EPA-registered. Non-restricted use pesticide used for protection of wood ties as a primary protective treatment against the attack of the wood by decay organisms or termites. The solvent used with CuN is No. 2 fuel oil but other carriers meeting American Wood Protection Association (AWPA0Standards HAS can be used. 12

13 CuN Regulatory Status Cu/CuNap Pentachlorophenol Creosote Arsenic Use Classification General Restricted Restricted Restricted Toxicity Category III I I I RCRA Listed Waste Not Listed F021, F027, F028,F032,K001 F034, K001, K035, U051 F035, P011 CERCLA RQ, lbs None OSHA carcinogen No Yes Yes Yes TCLP limits, mg/l None 100 None RED: CuN eligible for re-registration Nisus supporting EPA data call-in EU BPR Creosote to be Replaced by 2018: CuN best candidate

14 Solutions of QNAP8 Copper Naphthenate Concentrate can be applied to wooden and cellulose utility and construction products (including lumber, end cuts, timber, rail ties, posts, poles, freeway fencing, siding, piers, docks, boxes, roofs, shakes, shingles, porches, steps, fences, rails and beverage cases). QNAP8 Copper Naphthenate Concentrate treated wood is suitable for ornamental or planting landscape timbers ties, wooden seedling trays, outdoor décor, flower boxes and window boxes. The treated wood can be burned or re-purposed after primary service as a railroad tie or utility pole for use in residential landscaping or as fence posts. 14

15 Disposal & Environmental Impact CuN combustion products similar to other oil-borne wood preservatives. Oxidized to CO 2, H 2 O, and CuO/Cu 2 O Several facilities in the USA now permitted to burn CuN-treated wood. Potential for Cu recovery & recycle US EPA petition as Non-Hazardous Secondary Materials, suitable as boiler fuels. Life cycle analyses: Treated wood has lower environmental impact than steel, concrete, and plastic composites.

16 Copper Naphthenate Boultonized Ties at Mellott s 16

17 Pine Bridge Treatment with Copper Naphthenate at Boatright Dry to touch and completely clean, equivalent loading and performance to 10 pcf of creosote, almost complete penetration, Effective simple QC at any time during tie life 17

18 Pine QNAP Bridge Tie Installation 18

19 Conclusions CuN - proven safe and effective in use CuN-treated crossties - physical and environmental advantages for railroad users. Wood ties, timbers, poles and posts made from a renewable natural material, obtained from a sustainably managed source, treated with non-restricted use preservatives like CuN, the choice for improved performance, worker safety and sustainability.

20 Questions? (Courtesy Wheeler Lumber) 20