Published by department of transportation

49-2.02A(4)(b)(iii) Nondestructive Testing

Section 49-2.02A(4)(b)(iii) applies to NDT of Class N steel pipe piles.

Except for welding performed under API 5L, the acceptance criteria for RT and UT must comply with AWS D1.1 for cyclically loaded nontubular connections for welds subject to tensile stress.

Perform NDT on backing ring welds using RT or UT for a material thickness of 5/16 inch or greater or using RT for a material thickness less than 5/16 inch.

49-2.02A(4)(b)(iii)(B) Shop Welds

Section 49-2.02A(4)(b)(iii)(B) applies to NDT of shop welds.

For welding performed under API 5L:

1. Submit a DVD or VHS videocassette recording of the actual material testing if radiological testing is used or the actual radiographic film if film radiography is used. Submit the recording before shipping the material from the plant.

2. If film radiography is used to inspect pipe ends or repairs, the transmitted film density must be from 2.0 to 4.0 in the area of interest, weld, base metal, and image quality indicators.

3. Reinspect repaired defects using the NDT method that originally detected the defect except you may use film radiography for the inspection of repairs if the defect was originally detected using radiological testing.

1. Perform NDT on 25 percent of each longitudinal, circumferential, or spiral weld using RT or UT.

2. If repairs are required in a portion of the tested weld:

2.1. Perform NDT on the repaired portion.

2.2. Perform additional NDT on untested areas on each side of the repaired portion. The length of additional NDT on each side of the repaired portion must equal 10 percent of the pipe's outside circumference.

2.3. After this additional 20 percent of NDT is performed, and if additional repairs are required, determine and record the total cumulative repair lengths from all NDT. If the cumulative weld repair length is equal to or more than 10 percent of the pipe's outside circumference, then perform NDT on the entire weld.

Section 49-2.02A(4)(b)(iii)(C) applies to NDT of field welds.

Perform NDT on 25 percent of each field weld by RT or UT at locations selected by the Engineer. The Engineer may select several locations on a given splice. The cover pass must be ground smooth at locations to be tested.

Personnel performing UT for field welds must have their qualifications verified before performing NDT, by both written and practical exams. For UT qualification procedures, go to the METS website.

If repairs are required in a portion of the tested weld:

1. Perform NDT on the repaired portion.

2. Perform additional NDT on untested areas on each side of the repaired portion. The length of additional NDT on each side of the repaired portion must equal 10 percent of the pipe's outside circumference.

3. After this additional 20 percent of NDT is performed, and if additional repairs are required, determine and record the total cumulative repair lengths from all NDT. If the cumulative weld repair length is equal to or more than 10 percent of the pipe's outside circumference, then perform NDT on the entire weld.

49-2.02A(4)(c) Department Acceptance

Reserved

49-2.02B Materials

49-2.02B(1) General

49-2.02B(1)(a) General

Piles not specified as Class N in the special provisions must comply with the specifications for Class R.

The carbon equivalent of steel in steel pipe piles must not exceed 0.47 percent. Use the following formula to calculate the carbon equivalent:

CE = C + (Mn + Si)/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15
where:

CE = carbon equivalent, percent
Sulfur content of steel in steel pipe piles must not exceed 0.05 percent.

Seams in steel pipe piles must be CJP welds.

For welding and prequalifying base metal under Table 3.1 of AWS D1.1, treat steel pipe piles complying with ASTM A252 as either ASTM A572/572M, Grade 50, or ASTM A709/709M, Grade 50.

Section 11-2 does not apply to shop welds in steel pipe piles fabricated at a plant on the Department's Authorized Facility Audit List.

For groove welds using submerged arc welding from both sides without backgouging, qualify the WPS under Table 4.5 of AWS D1.1.

Butt welded seams subsequently formed, including skelp end welds, must be 100 percent ultrasonically tested in the final formed and welded condition. The acceptance criteria for UT must comply with one of the following:

1. API 5L for API-licensed facilities

2. AWS D1.1 for cyclically loaded nontubular connections for welds subject to tensile stress

Except for tack welding, do not use gas metal arc welding for welding of steel pipe piles. If gas metal arc welding is used for tack welding, do not deposit filler metal by short circuiting transfer.

49-2.02B(1)(b) Circumferential Welds

Welds must comply with AWS D1.1. Circumferential welds must be CJP welds.

Locate circumferential welds at least 12 inches away from a skelp end weld.

Backing rings must comply with the following:

1. Minimum thickness of the backing ring must be 1/4 inch and the backing ring must be continuous.

2. Splices in the backing ring must be made by CJP welds. These welds must be completed and inspected, including performing any required NDT, before final insertion into a pipe end.

3. Attach backing rings to pipe ends using the minimum size and spacing of tack welds that will securely hold the backing ring in place. Tack weld in the root area of the weld splice. Remove and replace cracked tack welds before subsequent weld passes.

4. Gap between the backing ring and the steel pipe wall must not be greater than 5/64 inch. You may offset 1 localized portion of the backing ring fit-up by a gap equal to or less than 1/4 inch if the localized portion is (1) equal to or less than 20 percent of the outside circumference of the pipe, (2) first seal welded using shielded metal arc E7016 or E7018 electrodes, and (3) marked such that it can be referenced during any required NDT.

5. Backing rings must have enough width such that the backing ring does not interfere with the interpretation of the NDT.

For steel pipe piles with an outside diameter greater than 42 inches and a wall thickness greater than 1 inch, you may increase the root opening tolerances to a maximum of 3/16 inch.

If splicing steel pipe piles using a circumferential weld, the piles must comply with the fit-up requirements of clause 5.22.3.1 of AWS D1.1.

49-2.02B(1)(c) Tolerances

Dimensional tolerances of steel pipe piles must comply with the following:

1. Outside diameter: ±0.75 percent of the outside diameter shown

2. Wall thickness: -5 to +10 percent of the nominal wall thickness shown

3. Straightness: ±1.0 percent over the length of the pipe

49-2.02B(1)(d) Markings

Except for steel pipe piles marked with the API monogram, mark each length of the steel pipe pile as follows:

1. Name and location of the piling manufacturer

2. State Contract number, for Class N only

3. Heat number

4. Welding process

5. Outer diameter, nominal wall thickness, minimum wall thickness, and length

6. Year piling was produced

7. Markings specified for each class of steel pipe piling

Only Department authorized audited facilities are authorized to mark piling for use on a Contract.

49-2.02B(1)(e) Substitutions

Reserved

49-2.02B(2) Class N Steel Pipe Piling

Section 49-2.02B(2) applies to steel pipe piles specified as Class N in the special provisions.

Class N steel pipe piles must comply with one of the following:

1. API 5L, minimum Grade X52, PSL1, and must be:

1.1. Manufactured, welded, tested, and inspected at a plant licensed to apply the API monogram

1.2. Marked with the API monogram on each length of steel pipe

2. ASTM A252, Grade 3, and the following:

2.1. Welding must comply with AWS D1.1.

2.2. Groove welds using submerged arc welding from both sides without backgouging require a procedure qualification record witnessed by the Engineer.

2.3. At the start of fabrication and for each thickness of the piling, furnish 3 macroetch cross-section test specimens prepared under clause 4.9.4 of AWS D1.1. Remove specimens at locations selected by the Engineer and in the presence of the Engineer. Test specimens must indicate that the weld is free of cracks and has thorough fusion between adjacent layers of weld metal and between weld metal and base metal. Undercut must not exceed 1/32 inch.

2.4. Weighing of individual pipe is not required as specified in ASTM A252.

2.5. Each length of pipe must be marked Caltrans Class N - A252.

49-2.02B(3) Class R Steel Pipe Piling

Section 49-2.02B(3) applies to Class R steel pipe piles.

Class R steel pipe piles must comply with one of the following:

1. API 5L, minimum Grade X52, PSL1, and must be:

1.1. Manufactured, welded, tested, and inspected at a plant licensed to apply the API monogram, except hydrostatic testing, flattening tests, and the API monogram are not required

1.2. Marked Caltrans Class R - API on each length of steel pipe

2. ASTM A252, Grade 3, and the following:

2.1. Arc welding processes must comply with AWS D1.1

2.2. Groove welds using submerged arc welding from both sides without backgouging require a procedure qualification record witnessed by the Engineer

2.3. Underfill is not allowed

2.4. For electric resistance welded pipe, remove the outer diameter flash to a maximum of 1/32 inch

2.5. Weld reinforcement must not exceed 1/8 inch

2.6. Weighing of individual pipe is not required as specified in ASTM A252

2.7. Each length of pipe must be marked Caltrans Class R - A 252

49-2.02C Construction

49-2.02C(1) General

You may retap steel pipe piles to prevent pile set-up if the field welded splice remains at least 3 feet above the work platform until the splice has been authorized.

When attaching handling devices to steel pipe piles, align the welds parallel to the axis of the pile. Welds must comply with the specifications for attaching backing rings in section 49-2.02B(1)(b). Permanent bolted connections must be corrosion resistant.

49-2.02C(2) Field Welds

Field welds must comply with section 49-2.02B(1)(b).

Field welds made in the horizontal position where the longitudinal pipe axis is vertical must be single-bevel groove welds.

Do not water quench field welds. Allow welds to cool unassisted to ambient temperature.

Remove ends of steel pipe piles to be spliced that have been damaged during driving to a sound and uniform section. Pipe ends must comply with the tolerances for diameter, edge alignment, and roundness in section 49-2.02B. Pipe ends must be field cut using automated guided cutting equipment. Do not use manual flame cutting.

49-2.02D Payment

Not Used

Directory: esc
esc -> Biblical Eschatology Presentation by: D. Paul Beck May 4, 2016 Ground Rules
esc -> Mikael Håfstrӧm Screenplay by Miles Chapman and Arnell Jesko
esc -> Escort affinity Program for Audi Club Members
esc -> Preliminary entry form pistol
esc -> Application form
esc -> Request from Asian and Pacific Training Centre for Information and
esc -> Constitution of the engineering student council university of maryland
esc -> Subdisciplines of Earth Science Geology; study of the earth

Download 6.74 Mb.

Share with your friends: