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DRY BULK STORAGE - CARBON STEEL TANKS
TABLE OF CONTENTS
DETAILED REQUIREMENTS OF
EQUIPMENT, MATERIALS, AND
SERVICES BY VENDOR
EQUIPMENT, MATERIALS, AND
SERVICES BY OTHERS
INFORMATION BY BIDDERS
QUESTIONS BY BIDDERS
Specification for Field Weld
Carbon Steel Tank for Dry Storage
This specification covers the supply of field erected
atmospheric and low pressure process and storage tanks. Tank
supplier to be Tank Connection,
ATEC Steel, or approved equal.
- OPERATING CONDITIONS
The subject equipment shall be operated
in accordance with the conditions outlined attached preliminary
drawing(s) – if any are listed.
(List drawings here)
- DETAILED REQUIREMENTS OF EQUIPMENT
Standards and Codes Applicable
3.1.1 All applicable codes in effect as of the date of purchase
and any subsections thereof, as applicable, shall govern design,
fabrication, inspection, testing, and selection of equipment and
materials supplied. These include, but are not limited to, the
Society of Mechanical Engineers
National Electrical Code
Electrical Manufacturers Association
American National Standards Institute
Institute for Testing and Materials
American Institute of steel Construction
Welding Society, D1.1-Rev. 1/76
American Petroleum Institute Standard 650
American Petroleum Institute Standard 620
Occupational Safety and health Standards
regulations of OSHA (Occupational Safety and Health Administration)
shall be complied with.
3.1.2 Local, state, and federal regulations in effect as of
date of purchase shall be complied with.
3.1.3 Vendor shall warrant that all materials, equipment, and
things furnished by Vendor in connection with this specification and
that Purchaser’s use in accordance with Vendor’s operating
instructions shall comply with all such applicable laws, rules,
regulations, and codes.
3.2.1 The tank fabricator shall have full responsibility of
tank’s design and fabrication.
3.2.2 The Owner relies entirely on the builder of the tanks for
their safe design and construction. Any approvals required by the
Owner shall be limited to approvals of configuration, dimensions,
and finish and shall not affect the builder’s responsibility to
construct a structurally safe tank.
3.2.3 All shell nozzles shall have reinforcing as required per
API 620. Reinforcing pad materials, if required, shall be of the
same material as the shell.
3.2.4 Slip-on flanges on tanks shall be installed so that the
face of the flange projects over the end of the pipe a distance of
equal to the pipe thickness plus 1/8-inch minimum. Minimum
nozzle projection shall be 6 inches.
3.2.5 Nozzle size and location will be determined after the
purchase order is issued. Any attached data sheet(s) and/or drawings
shall give the approximate number and size of nozzles presently
anticipated. The Vendor shall include, in his base price, all
3.2.6 Nozzles supporting mechanical equipment shall be suitably
3.2.7 Tank components and loose parts shall be tagged by the
tank equipment number as specified on the sketches.
3.2.8 The fabricator shall submit shop drawings to the Owner’s
Engineer for approval before commencing work.
3.2.9 See attached tank sketches for dimension and other
3.3.1 For carbon steel tanks, plates shall be free of heavy
rust and mill scale and white conforming to ASTM A36. Any deviation
from this paragraph will be stated on attached tank sketches.
3.3.2 For carbon steel tanks bolts and nuts shall conform to
ASTM A-307. Bolts shall be Grade B with regular hexagon heads; nuts
shall be the hexagon heavy series.
3.3.3 Carbon steel piping shall conform to ASTM A-53 B, and
couplings to ASTM A-105. All pipe nozzles flanges shall be 150
pound, forged steel, slip-on type, conforming to ASTM A181, Grade 1.
Manway flanges and covers shall be drilled to 150-pound standard
dimensions. Any manway covers on the top shall be hinged and
capable of sealing. Any manway covers on the side shall have a
davit installed with the tank.
3.3.4 Chemical analysis of the material as supplied by the
steel manufacture shall be available upon request.
3.3.5 Ladders, cages, crosswalks and handrails shall be
Galvanized or Epoxy painted CS construction. Fabrication shall be in
accordance with and must meet OSHA Standards.
3.4.1 Stress Values
Design strength of carbon steel
materials shall be in accordance with AISC 360-05.
The outstanding leg of the shell top
angle shall extend outside the tank and shall include a drip
ring if the tank is insulated. Support rings should be
included as required.
3.4.2 The Supplier shall design all tank anchorage
requirements for the maximum calculated loading including wind and
seismic loads per the applicable codes. Anchor bolts shall have a
minimum size of 3/4inch in diameter. Anchor bold design stress shall
be within the limits permitted by the latest edition of the American
Institute of Steel Construction (AISC 360-05).
3.4.3 Tanks which are subjected to a vacuum shall be noted
by a negative psig or inches of water vacuum design pressure on the
appropriate Tank Specification Sheet or Tank Sketch. These tanks
shall have adequate wall thickness and or external ring
reinforcements to resist tank wall collapse.
3.5.1 The tolerances apply for empty tanks in normal position.
3.5.2 All appurtenances shall be located in elevation from a
common base or datum line
3.5.3 The difference between the maximum and minimum inside
diameter or a tank shall not exceed 1/2percent of the nominal
diameter or 1 1/2inches (whichever is less).
3.5.4 The difference in height or length of a tank shall not
exceed + 1/4percent of the specified dimension or + 1
1/2inches (whichever is less).
3.5.5 Anchor bolt hole locations shall not exceed + 1/4.
3.5.6 Tank nozzle and accessories location shall not exceed
+ 1/4 inch.
3.6 Tank Appurtenances Assembly
3.6.1 Plates, gaskets, and fasteners shall be included. Manhole
cover davits or hinges shall be included.
3.6.2 Carbon steel pipe nozzle wall thickness shall no be less
than standard weight pipe. All nozzles 2-inch IPS and smaller shall
be Schedule 80 pipe.
3.6.3 Tank ladders and caged ladders shall be supplied loose
and shall be installed in the field. Grounding lugs where applicable
shall be indicated as required.
3.7 Surface Preparation
3.7.1 Heavy weld splatter shall be removed by grinding and any
deep scars, pits, or points shall be filled in or ground out as
required to remove sharp edges.
3.7.2 Tanks shall be clean and reasonably free of oil, grease,
loose scale, and rust.
3.8 Paint and Insulation
3.8.1 Field erected tanks shall not be painted or insulated
under this specification.
3.8.2 Ladders, cages, and stairways shall be Epoxy Painted or
Galvanized after fabrication.
3.9 Additional Design Standards
3.9.1 Shell and hopper product pressures are calculated using
the technical paper “Effect of Solid Flow Properties and Hopper
Configuration of Silo Loads,” by Jenike, A.W., Jenike and Johanson,
Inc. The analysis uses the Janssen formula for defining pressures
and loads imposed by funnel or mass flow. Radial tension in the
shell, from the above mentioned product loads, are from the “Design
of Steel Bins for Storage of Bulk Solids,” Gaylord and Gaylord,
Section 8.2. Loadings in the hopper, from the above mentioned
product loads, are from the “Design of Steel Bins and Storage of
Bulk Solids,” Gaylord and Gaylord, Sections 5-12, 8-6.
3.9.2 Shell compressive strength design is based on the
critical buckling formula for a long cylinder from the book
Structural Analysis of Shells by Baker, Kovalesvsky & Rish, pg. 230.
The shell material’s critical buckling stress is not allowed to
exceed its yield strength.
3.9.3 Shell unit forces from day product pressure is based on
the principles of API 620.
3.9.4 The hopper to sidewall connection design is based on the
principles of API 620.
3.9.5 Deck sheet design unit forces under internal pressure are
based on the principles of API 620. The deck to sidewall connection
under internal pressure is based on API 620.
3.9.6 Shell design under vacuum is based on the critical
buckling formula from the book “Structural Analysis of Shells” by
Baker, Kovalevsky & Rish.
4.2 Vendor shall provide optional pricing to paint all
exterior Steel surfaces with vendor’s standard Epoxy.
5 EQUIPMENT, MATERIALS, AND SERVICES BY VENDOR
5.1 The Vendor shall supply, unload, and field erect, the
tank or tanks as described in the attached drawing(s).
5.2 Covers, blind flanges, and gaskets for nozzles as
designated on the datasheet.
5.3 Tank Vendor shall provide gasoline (or diesel) powered
welding machines and air compressors. Owner shall provide 110 volt
source for erector’s use. The use of 110 volt power by Tank Vendor
shall be limited to lighting, small electric hand tools, and
6 EQUIPMENT, MATERIALS, AND SERVICES BY OTHERS
6.1 Foundation and anchor bolts.
6.2 Insulation required shall be supplied by others except as
7 INFORMATION BY BIDDER
7.1 Bidder shall list by item the tank name, weights, and
7.2 Vendor shall list metal thickness quoted for walls,
bottom, and top of each tank.
8 PERFORMANCE GUARANTEE
warranty as to workmanship, material, and satisfactory mechanical
functioning for a period of 12 months after the equipment is placed
in service is be furnished in writing with quotation.
9 SPECIAL COMPLIANCES
10 QUESTIONS BY BIDDERS
Questions of an engineering or technical nature should be directed
Questions of a
commercial nature should be directed to:
11.1 The following Data Sheet(s) and/or Drawing(s) are