HomeMy WebLinkAboutDCVR-HCI-12DESIGN CLARIFICATION/VERIFICATION REQUEST
CONTRACTOR: Hankal Construction, Inc.
PROJECT: Unalakleet Bulk Fuel
Upgrade
SPEC. NO.: 15052
DC/VR NO.: HCI 12
CONTRACT NO.: REG-06-088
DRAWING NO.:
DESCRIPTION OF REQUEST:
Contractor proposes to substitute a strategy for radiographic testing
and inspection of the welds on above ground piping versus the
specification requirement of 100% visual inspection by a Certified
Welding Inspector.
Language to amend the specification to permit radiographic testing is
attached.
ATTACHMENT: YES® NOF-1
CHANGE ORDER: YES NO®
IF YES PROVIDE RFP:
WRITTEN BY: DAVP SH�LLENBERGER
APPROVED BY:
DAVE SHELLENBERGER
RESPONSE:
RFP
NO
DATE:
DATE:
BY: DATE:
is is NOT an authorization for additional reimbursement or time
extension. Authorization of such can be made only by the owner through a
change order in accordance with the contract documents.
DCVR HCI 12
Amend SS 15052 3.03 C. Radiographic Testing:
Delete: "NOT REQUIRED"
Add: Radiographic (and other forms of non-destructive testing as specified below) will
be allowed in lieu of visual inspection as per API1104, except as modified
herein. The extent of required examination shall be as follows:
ABOVEGROUND PIPING
Weld Type VT RT PT or MT
ALL FUEL PIPING BUTTWELDS 100% OR 20%
SOCKET AND OTHER FILLET WELDS 100% OR 20%
NOTES:
1. The welds to be radiographed shall be representative of all piping systems installed and
shall include a minimum of one weld examined for each welder on each fabricated
assembly.
2. If any of buttwelds examined by one welder fail the radiographic examination, all welds
made by that welder shall be examined by radiography.
3. Liquid penetrant examination (PT) of magnetic particle (MT) shall be performed at the
lesser of one-half of the weld thickness or each 'h inch of weld thickness and all
accessible final weld surfaces.
4. For nondestructive examination of the pressure retaining component, refer to the
standards listed in applicable code.
UNDERGROUND PIPING
Weld Type VT RT PT or MT
ALL FUEL PIPING BUTTWELDS 100% OR 100%
SOCKET AND OTHER FILLET WELDS 100% OR 100%
NOTES:
1. Liquid penetrant examination shall be performed at the lesser of one-half of the weld
thickness or each %2 inch of weld thickness and all accessible final weld surfaces.
2. For nondestructive examination of the pressure retaining component, refer to the
standards listed in applicable code.
3. Exposed piping under the Kowwagok Slough bridge must be treated as underground
piping for purposes of inspection and testing of welds.
DCVR HCI 12
B. Visual Examination Requirments
Before welding: For compliance with requirements for joint preparation,
alignment and fit -up, cleanliness, material, and proper fabrication.
2. During welding: For conformance to the qualified welding procedure,
cleaning between passes, complete fusion of each pass and weld quality.
After welding: For compliance with acceptance criteria bead
reinforcement, undercutting, arc strikes, burns, porosity, overlap, profile,
and size of welds.
Amend SS 1502 3.04 ACCEPTANCE STANDARDS
Delete: ALL
Replace with:
3.4 ACCEPTANCE STANDARDS
A. Pressure test: No Leaks
B. Fuel Piping — Aboveground and Underground Piping: Comply with API 1104.
Except as modified for specific non-destructive test methods.
C. Visual
No cracks are permitted
2. No lack of fusion permitted
no undercut is permitted
4. Depth of undercut on girth and miter groove welds shall not exceed 1/64
inch.
No indications of surface porosity or exposed slag inclusions are
permitted.
6. Convexity of fillet weld surface may be no greater than 10 percent of
longest leg plus 0.03 inch.
7. Concavity in fillet welds may be no greater than 1/16 inch.
D. Radiography
No indications of cracks, lack of fusion, surface porosity, or surface slag
inclusions.
No indications of incomplete penetration, including incomplete
penetration due to high -low shall be permitted.
DCVR HC112
3. No elongated indication of which has an individual length greater than %4
inch for weld thickness up to'/4 inch. If a weld joins two members
having different thickness at the weld, the weld thickness is the thinner
of the two members joined.
4. No internal porosity in excess of that shown acceptable in API 1104
E. Liquid Penetrant or Magnetic Particle: No indications of cracks, lack of fusion,
surface porosity, or surface slag inclusion.
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