A.02 USACE Drawing E-1730-18.pdf

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GENERAL NOTES: Unless otherwise specified

1. Do not scale drawing

2. All dimensions shown to finished size in inches.

3.

4.

Tolerances - Decimals as shown, Fractions + or - 1/64" l'v1aterial: High chrome white iron with following properties:

Tensile Strength Elon°ation Brinell Hardness

Fracture toughness

Microstructure

110,000 psi to 150,000 psi 0.5% to 1.5% 490 to 580

29 KSI/[ii to 37.4 KSI/[ii per ASTM E-399-83 KlC M

C3 type with rounded edges in a matrix of at least 50 % 1nartcnsite. The remainder of the matrix will be austenite or ferrite with so111e secondary carbides.

5. Patterns - Govern1ncnt furnished, ,#:i:?3te, Weight 628 lbs. including crate, Crate size 4' x 4' x 3.5' high. Patterns originally made for casting �teel. Patterns must be modified for white iron.

Patterns to be modified as required to allow for shrink and swell to achieve finished dimensions shown. Prior to returning pattern, clean and varnish per standard foundry practices. Return pattern in its original crate.

6. Finish - Unless indicated otherwise, surfaces shall be as-cast and shot-blasted.

, 7. Mating Surfaces - After machining, shall clean-up 70% complete. Surface sand defects are acceptable under the following conditions:

Bumps shall be ground smooth. a.

b. Pockets (1/16" deep or less) shall be faired-in by grinding

c. Pockets not over 1/16" deep and not over 2" in diameter or 2" in length.

8. Balance: The contractor shall remove material by grinding in area noted. Balance shall be within 2 lb at the 0. D. of the i1npeller.

, M, Inspection:

a; . All castin"s shall be identified by casting raised letters and numbers in the area ,. shown, they shall not be higher than the adjacent surfaces. The identification shall be in 2 . .,.-inch hi_gh letters, and shall consist of the last 7 nun1bers and letters of the contract number.

b. A test coupon, also marked as above, shall be poured from the same heat for each,casting for later heat ti-eatment and testing.

c. Heat treatment of the casting is the responsibility of the vendor.

d. .P.. ladle AAalysis seal! es pro�1ided for etteh peur iavewed. Thi3 a:na:lysis 3!tttll . iadioe:te te v.hieh eastirig it awlies. The re:iuHs ef thoss a,iialyses sl:Jall 88 Fllffiislteel te the Go¥eroml;!ot In9f)eeter. Any cracks visible with dye penetrant shall be rejected.

e. Inspection of the finished castings shall be by dye penetrant inspection. The.

Contractor shall check the casting for dimensional accuracy and faults such as sand inclusions, cracks or gas pockets. Any distortion that will prevent the easting fro111 being

· machined to drawing size will be c�e for rejection.

f. The test coupon shall be attached to and heat-treated with each casting. This coupon shall be tested by an independent or the Contractor's in-house testing laboratory to confinn that the 111atcrial properties meet the requirements. A written copy of this report shall be furnished to the Government Inspector on or before the final inspection.

g. It is the intent of the Government to inspect the finish machined castings only one time. However, the goven1ment reserves the right to spot-check the progress of the work at any time during the progress of the work. The final inspection by the Government shall be after all machining is complete. For this inspection the parts shall be clean and shot-or sand blasted to near-white (except machined surfaces which shall be protected from blasting). The Inspector may make this final inspection prior to ship1nent of these coinponcnts to the Govern1nent.

DR�t)GE £.SSAYONS

Thi! drawing is deriyed iron Dredge Technology Corporatiertr;; · , /4\ drawings (as listed above) whlch were furni,hed. tmder Contract.

- .. DACW61-79-C-0159 to Sun Ship, !pc,, P. 0. Xll60QH/Dl'C Job.

3026r/IHC ORO. 70,010 e1cept for ehan9es noted_ ab-ave.

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Contents are subject to li11i.ted rights per F.A.R. 52.2�7-14, etc,.

The u. s. Government prohibi.ts any use or disclosure other than mintenanc-e and re-pair af 0, 8. Arm1 Corps of Engineers, Dredge

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DWG NO. EV

E - 1730- l 8 A

SHEET OF

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12.7963 XXXX

12.7943XXXX