Section 05500
MISCELLANEOUS METALWORK
PART 1 - GENERAL
1.1
SUMMARY
A. This section includes:
1. Custom fabricated metal items and certain manufactured units not otherwise
indicated to be provided under Work of other sections of the Specifications.
2. Seat angle frames
3. Iron castings
4. Concrete inserts
5. Cover plates and frames
6. Pipe sleeves
7. Preformed channel pipe supports
8. Miscellaneous metal fabrications not covered elsewhere
9. Associated accessories to the above items
1.2
REFERENCE SPECIFICATIONS, CODES, AND STANDARDS
A. All Work specified herein shall conform to or exceed the applicable requirements of the
publications referenced in this section. If there is a conflict between the requirements
of the referenced publications and other provisions of the Specifications, the other
provisions of the Specifications shall prevail.
B. Comply with the applicable editions of the following codes, regulations, and standards.
1. ASTM International (ASTM):
A36 - Standard Specification for Carbon Structural Steel
A48 - Standard Specification for Gray Iron Castings
A240 - Standard Specification for Chromium and Chromium-Nickel Stainless Steel
Plate, Sheet, and Strip for Pressure Vessels for General Applications
A276 - Standard Specification for Stainless Steel Bars and Shapes.
A307 - Standard Specification for Carbon Steel Bolts and Studs, 60,000 psi Tensile
Strength
A380 - Standard Practice for Cleaning, Descaling, and Passivation of Stainless
Steel Parts, Equipment, and Systems
A489 - Standard Specification for Carbon Steel Lifting Eyes
A500 - Standard Specification for Cold-Formed Welded and Seamless Carbon
Steel Structural Tubing in Rounds and Shapes
A635 - Standard Specification for Steel, Sheet and Strip, Heavy-Thickness Coils,
Hot-Rolled, Alloy, Carbon, Structural, High-Strength Low-Alloy, and High-Strength
Low-Alloy with Improved Formability, General Requirements for
A653 - Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or
Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process
South Perimeter Wall and
Soil Improvements at Plant No. 2
Contract No. P2-128A
CONFORMED
MISCELLANEOUS
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A967 - Standard Specification for Chemical Passivation Treatments for Stainless
Steel Parts
A992 - Standard Specification for Structural Steel Shapes
F593 - Standard Specification for Stainless Steel Bolts, Hex Cap Screws and Studs
F594 - Stainless Steel Nuts
F3125 - Standard Specification for High Strength Structural Bolts, Steel and Alloy
Steel, Heat Treated, 120 ksi and 150 ksi Minimum Tensile Strength
2. American Welding Society (AWS):
A2.4 - Standard Symbols for Welding, Brazing, and Nondestructive Examination
D1.1 - Structural Welding Code - Steel
D1.6 - Structural Welding Code - Stainless Steel
3. Occupational Safety and Health Administration (OSHA)
29 CFR 1910.27 - Fixed Ladders
29 CFR 1926.502 - Fall Protection Systems Criteria and Practices
4. California Building Code (CBC)
1.3
DEFINITIONS
A. Passivation: Removal of exogenous iron or iron compounds from the surface of a
stainless steel by means of chemical dissolution resulting from treatment with an acid
solution that removes the surface contamination but does not significantly affect the
stainless steel itself.
B. Galvanized: Hot-dip galvanized per Section 05910, Hot-Dip Galvanizing.
1.4
SUBMITTALS
A. Submittals shall comply with the GENERAL REQUIREMENTS, ADDITIONAL
GENERAL REQUIREMENTS, as specified herein, and shall include the following:
1. Information required by GR-30, Submittal Procedures and GR-31, Shop Drawing
Submittals.
B. Product Data:
1. Catch basin frames and grating.
C. Shop drawings:
1. Miscellaneous metals.
1.5
SHIPPING, STORAGE, AND HANDLING
A. Ship and store items per Section 01600, Shipping, Storage and Handling.
PART 2 - PRODUCTS
2.1
MATERIALS
A. General: Unless otherwise specified or indicated on the Drawings, structural and
miscellaneous metals shall be in accordance with the standards of the ASTM, including
the following:
MISCELLANEOUS
METALWORK
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South Perimeter Wall and
Soil Improvements at Plant No. 2
Contract No. P2-128A
CONFORMED
ASTM
Standard No.
Class, Grade
Type or Alloy No.
A48
Class 40B
Galvanized sheet iron or steel
A653
Coating G90
Coil (plate)
A635
--
Structural plate, bars, rolled shapes, and
miscellaneous items (except W shapes).
A36
--
Rolled W shapes
A992
Grade 50
Standard bolts, nuts, and washers
A307
--
High strength bolts, nuts, and hardened flat washers
F3125
A325
Eyebolts
A489
Type 1
Tubing, cold-formed, round
A500
Grade C
Tubing, cold-formed, square and rectangular
A500
Grace B
Plate, sheet, and strip
A240
Type 316(1)
Bars and shapes
A276
Type 316(1)
Bolts (Type 316)
F593
Group 2 Condition CW
Item
Cast Iron
Cast Iron
Steel
Stainless Steel
Notes:
(1) Use Type 316L if material will be welded.
1. Stainless steels are designated by type or series defined by ASTM.
2. Where stainless steel is welded, use low-carbon stainless steel.
2.2
MANUFACTURED UNITS
A. Concrete inserts:
1. Concrete inserts for supporting pipe and other applications shall be per
Section 15020, Pipe Supports.
B. Cover plates and frames:
1. Plate having a raised figured pattern on one surface to provide improved traction.
C. Miscellaneous cast iron:
1. General:
a. Tough, gray iron, free from cracks, holes, swells, and cold shuts.
b. Quality such that hammer blow will produce indentation on rectangular edge
of casting without flaking metal.
c.
Before leaving the foundry, clean castings and apply 16-mil dry film thickness
coating of coal-tar epoxy, unless otherwise specified or indicated on the
Drawings.
South Perimeter Wall and
Soil Improvements at Plant No. 2
Contract No. P2-128A
CONFORMED
MISCELLANEOUS
METALWORK
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D. Miscellaneous stainless steel:
1. Provide miscellaneous stainless steel items not specified in this section as
indicated on the Drawings or specified elsewhere.
a. Fabricate and install in accordance with the best practices of the trade.
2. Perform post-fabrication (shop or field) surface treatment for stainless steel as
follows:
a. General Requirements:
(1) Stainless steel sheet, plate and pipe are normally cleaned by the producer
using acid pickling solutions or mechanical methods. Additional
contamination of the metal is expected during the process of welding,
fabrication, and installation of the equipment. Such contamination can
degrade the corrosion-resistance of the affected areas. This section
addresses the requirements for post-fabrication cleaning of stainless steel.
It is intended for this procedure to be used by stainless steel fabricators; it
is not intended to be used by primary producers of stainless steel mill
products.
(2) This practice is required for all surfaces in and around stainless-tostainless welds on the process side of the equipment and for all visible
exterior welds.
b. General Cleaning
(1) General cleaning to remove dirt, oil, grease, fluxes, and other
contaminants from fabrication shall be performed per ASTM A380.
(2) Degreasing and general cleaning shall be accomplished by swabbing or
spraying with alkaline, emulsion, solvent, or detergent cleaners, or a
combination of these; by vapor degreasing by steam, with or without a
cleaner; or by high pressure water-jetting. Use of carbon steel wire
brushes for mechanical cleaning shall not be allowed.
c.
De-scaling and Removal of Heat Tint
(1) De-scaling and heat tint removal shall be performed per ASTM A380 and
the following requirements.
(2) All weld heat tint shall be removed from welds and associated heataffected zones with pickling paste/spray product or abrasive blasting.
(3) Pickling shall be in accordance with the product manufacturer’s
instructions. The metal temperature during acid cleaning or pickling shall
be at least 50 degrees F, but not above 105 degrees F. Pickling shall not
be performed in direct sunlight.
(4) When acid pickling is performed, care shall be taken to protect any carbon
steel elements from contact with the pickling product. If carbon steel
elements come into contact with the paste, they may be rejected and
require replacement at the option of the ENGINEER, at no additional cost
to OC SAN.
(5) Disposal of acid pickling and any other residual or wastes shall meet all
environmental regulations and shall be coordinated with the ENGINEER.
MISCELLANEOUS
METALWORK
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South Perimeter Wall and
Soil Improvements at Plant No. 2
Contract No. P2-128A
CONFORMED
(6) The cost of collecting, managing and disposal of any cleaning wastewaters
shall be included in the CONTRACTOR scope. The CONTRACTOR shall
coordinate the Work with OC SAN’s safety and environmental compliance
staff.
d. Passivation Treatment
(1) Passivation is the process of removing exogenous iron or iron compounds
from the surface of a stainless steel.
(2) Passivation treatments shall be performed per ASTM A380 and A967 and
the following requirements.
(3) Passivation shall be performed using a 4 to 10 weight percent citric acid
solution (commercially available). The solution shall be continuously
swabbed or sprayed on all previously cleaned weld and weld-affected
surfaces for the following duration, per the solution manufacturer’s
instructions and the procedures in ASTM A380 and A967:
(a) At ambient temperature of ≥ 70 degrees F, for 20 minutes.
(b) At ambient temperature between 40 and 70 degrees F, for 40
minutes. Rinse all surfaces contacted by the acid solution thoroughly
for at least 2 minutes, using distilled water. Test surfaces for
adequate passivation by spraying or swabbing with copper sulfate
solution to continuously wet the surface for 6 minutes, per ASTM
A967. If any iron is present, it will exhibit copper deposits with a
pinkish tint (like a new penny), very distinct from the silver or gray
stainless steel surface. Areas exhibiting copper deposits shall be repassivated, as above, but for only 20 minutes regardless of
temperature.
e. Improperly or poorly cleaned and passivated materials shall not be shipped
and will not be accepted at the job site.
E. Miscellaneous structural steel:
1. Provide miscellaneous steel items not specified in this section as indicated on the
Drawings or specified elsewhere.
a. Fabricate and install in accordance with the best practices of the trade.
F. Isolating sleeves and washers:
1. As indicated on the Drawings and as specified in this section, protect dissimilar
metals from galvanic corrosion by means of pressure tapes or isolators.
PART 3 - EXECUTION
3.1
EXAMINATION
A. Verification of conditions:
1. Examine Work in place to verify that it is satisfactory to receive the Work of this
section.
2. If unsatisfactory conditions exist, the CONTRACTOR shall not begin this Work until
such conditions have been corrected.
3.2
PREPARATION
A. Make provisions for erection loads with temporary bracing. Keep Work in alignment.
South Perimeter Wall and
Soil Improvements at Plant No. 2
Contract No. P2-128A
CONFORMED
MISCELLANEOUS
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B. Supply items required to be cast into concrete or embedded in masonry with setting
templates.
3.3
INSTALLATION
A. General:
1. Install products as indicated on the Drawings, and in accordance with shop
drawings and manufacturer's printed instructions, as applicable except where
specified otherwise.
2. Interface between materials:
a. Dissimilar metals: Where steel comes in contact with dissimilar metals (such
as aluminum, stainless steel, etc.), separate or isolate the dissimilar metals.
(1) Make application so that the isolating or protective barrier is not visible in
the completed construction.
(2) Protect dissimilar metals from galvanic corrosion by means of pressure
tapes or isolating sleeves and washers.
B. Catch basin frames and grating:
1. Installation: As specified in Section 02726, Precast Concrete Vaults.
C. Stainless Steel:
1. Welding:
a. Passivate field-welded surfaces:
(1) Provide cleaning, pickling, and passivating as specified in this section.
(2) Clean using Derustit Stainless Steel Cleaner, or equal.
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MISCELLANEOUS
METALWORK
05500-6
South Perimeter Wall and
Soil Improvements at Plant No. 2
Contract No. P2-128A
CONFORMED