12 CRR-NY 21.13NY-CRR
12 CRR-NY 21.13
12 CRR-NY 21.13
21.13 Specifications for anchors and anchor fastenings.
(a) Required type.
Anchors and their fastenings shall be approved and the anchor shall bear the mark of approval prescribed by the board. They shall be machined from bar stock or forged as hereinafter set forth. Anchors shall conform with the dimensions as shown in Figures 2 and 3 below:
(b) Required material.
Anchors and anchor fastenings except reinforcing plates shall be of alloys as follows:
(1) Items which are to be forged shall be made of the following alloys:
|Nickel-copper alloy, ASTM designation B127-49T containing|
|Nickel||Max. Per cent||63.0 to 70.0|
|Copper-nickel alloy, ASTM designation B122-54T, alloy No. 5 containing|
|Nickel||Max. Per cent||29.0 to 33.0|
|Copper||Min. Per cent||65.0; or|
|Stainless steel AISI type No. 304 containing|
|Carbon||Max. Per cent||0.08|
|Chromium||Per cent||18.0 to 20.0|
|Nickel||“||8.0 to 11.0; or|
|Stainless steel AISI type No. 316 containing|
|Carbon||Max. Per cent||0.1|
|Chromium||Per cent||16.0 to 18.0|
|Nickel||“||10.0 to 14.0|
|Molybdenum||“||2.0 to 3.0|
(2) Machined fastenings and other items shall be of the same material as the forgings to which they are attached except that machined parts of stainless steel may be made from AISI type 303 and machined parts of nickel-copper alloy may be made from Class B material having a sulfur content of not more than 0.5 per cent.
(c) Required fabrication.
(1) Anchors and anchor fastenings shall be machined from bar stock, or forged and treated as specified below:
|Material||Preheat temp. (°F.)||Start forging at (°F.)||Finish forgin at (°F.)||Anneal after forging||Range of BHN hardness after forging and annealing|
|Ni-Cu||None||Not over 2150||Not below 1700||5 to 10 min. at 1600°F.||110 to 140 BHN|
|Cu-Ni||None||1900||1600||Approx. 5 min. at 1700 to 1750°F.||150 to 170 BHN|
|304||to 1500 slowly||2050 to 2200||1600 to 1700||15 min. 1950 to 2050°F.||150 to 160 BHN|
|316||to 1500 slowly||2100 to 2200||1600 to 1700||15 min. at 1950 to 2050°F.||150 to 170 BHN|
(2) The heating for forging of nickel-copper and copper-nickel alloys shall be done in an atmosphere that is essentially sulfur-free. The fuel used shall contain not more than 0.5 per cent of sulfur. Such atmosphere shall be slightly reducing with a carbon-monoxide content of two per cent or more. After forging and annealing, each anchor shall be pickled to remove scale and discoloration. No cold working of anchors other than drilling, spot-facing, reaming, boring, broaching, countersinking, threading, and grinding is permitted.
The finished anchor shall be free of imperfections and all corners shall be properly filleted or rounded. Where screw fastenings are used, the surface shall be spot-faced to receive the lock washer under the screw head.
(e) Tests of finished forgings.
(1) If and when the commissioner so requires, the owner of finished forgings of anchors and anchor fastenings shall select such number of forgings from each lot as the commissioner may require for testing. The commissioner may require such test specimens to be subjected by the owner to the BHN hardness test and a nondestructive test such as the fluorescent penetrant test.
(2) The manufacturer of such anchor forgings shall cause at least one per cent, but not less than two forgings, of each lot to be subjected to an impact test as follows:
The anchor shall be attached to a rigid anchorage. A 250 pound solid and compact weight of iron or lead shall be suspended from the anchor by means of an approved belt terminal and a 6-37 strand three-eighths inch plow steel wire rope. The test rope shall be not more than six feet long and rope connections shall be by thimble and splice or proper size rope clamps. The test weight shall be hoisted to a point in vertical alignment with the point of suspension and allowed to fall free a distance of four feet.
(3) Such manufacturer shall notify the commissioner of such impact tests in advance.
(4) If any specimen from a lot fails to withstand the impact test, the lot from which it was taken shall be either re-treated and retested or scrapped. If any specimens from a re-treated lot fails to withstand such test, the lot shall be rejected and scrapped.
(f) Screw thread.
Fastening screws and bolts shall have an untreated portion under the head not less than three-sixteenths inch long. Threads shall be cut.
12 CRR-NY 21.13
Current through March 15, 2022
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