20Q0329 Attachment 1 Brow SOW Updated.pdf

__________________ Attachment 1

Statement of work for a 45 Foot Personnel and Equipment Brow

1. SCOPE

1.1. This specification provides the minimum requirements for Government purchase of one pre-engineered, 45 foot brow capable of supporting personnel and equipment.

1.2. Code 410 Note: Prior to contract award, Code 2310 Engineer, requests review of quotes.

2. REQUIREMENTS

2.1. DESIGN CRITERIA

2.1.1. Provide an aluminum brow to support personnel and equipment.

2.1.1.1. Length shall be 45 feet

2.1.1.2. Width shall be 4 feet

2.1.1.3. The brow shall be designed to support a proof test of 300 LB per linear foot.

2.1.1.4. Brow walking surface shall be manufactured from aluminum grating. Grating shall be serrated to provide traction for foot traffic. Grating shall be supported on a span to meet the requirements of 2.1.1.3. The grate shall be securely fastened to the structural supports (i.e. tack weld or manufactured clips).

2.1.1.5. Handrails shall be installed the full length of the brows on both sides. Handrails are to also be installed on the removable sections and shall not create a pinch hazard when fit up to a standard brow. OSHA rules apply.

2.1.1.5.1. Handrails shall support a 200lb load applied at the top of the rail in any direction.

2.1.1.5.2. The top surface of the top handrail shall be 42” from the walking surface.

2.1.1.5.3. An intermediate rail shall be installed at the midheight between the top rail and the walking surface.

2.1.1.5.4. Top rails must be smooth surfaced throughout their entire length.

2.1.1.5.5. The ends of the rails must not overhang the terminal posts.

2.1.1.5.6. Vertical posts must not be spaced no more than 8’ on center.

2.1.1.5.7. Pipe railings, posts, and top and intermediate railings shall be 2-1/2”

Schedule 40 pipe.

2.1.1.5.8. Removable stair railings shall be 1-1/2” Schedule 40 pipe.

2.1.1.5.9. The space between the walking surface and the top rail is to be contained with a means to prevent tools or material from falling.

2.1.1.5.10. Wire mesh attached to the railings shall be made of aluminum and shall be removable.

2.1.1.6. Removable stair sections shown in Figure 5 shall be designed such that both sections are interchangeable (bolt patterns are the same). The removable sections shall have the capability of being installed on all brows purchased under this contract.

Maximum riser is 8 inches.

2.1.1.7. All threaded fasteners shall include washers and locking devices. All threaded fasteners shall be dry torqued to the correct value for size and material of the fastener.

All nuts, bolts, and washers are to be hot dipped galvanized.

2.1.1.8. Pillow block to support roller shaft shall be sealed to retain lubricant and grease.

A grease fitting shall be required to enable greasing and lubrication of bearings.

2.1.1.9. Removable roller shall be able to bolt at the two locations shown in the sketch.

Contractor shall make the bolt pattern identical for each location.

2.1.1.10. Lashing eyes shall be per Figure 5. They are for tie down only, not to be used for lifting purposes.

N3904020Q0329

2.2. PAINT

2.2.1. All exterior steel surfaces, if not corrosion protected (galvanized, zinc plated, etc.), shall be painted as specified. Steel surfaces shall be cleaned and free from mil scale, flake rust, and rust pitting. Shearing and punching shall leave clean true lines and surfaces. Apply primer coating to dry surfaces no more than 4 hours after near white cleaning and in accordance with manufactures’ instructions. Apply coats of each system so that finished surfaces are free from runs, sags, brush marks and variations in color.

2.2.2. Exterior steel surfaces shall be painted using a three coat paint system as specified below.

The minimum total dry mil thickness shall be 8 mils.

2.2.3. 2 coats of Epoxy polyamide Formula 150 MIL-P-24441B Primer. (2 mils thickness per coat)

2.2.4. 1 Gray overcoat of Epoxy Polyamide Formula 151 MIL-P-24441B (4 mils thickness)

2.2.5. Start paint work only when ambient and curing temperatures are within limits of manufactures’ recommendations and at least 5 degrees F above the dew point temperature.

2.3. WELDS

2.3.1. Grind all welds smooth where possible. All cut surfaces must be free of sharp or rough edges.

2.3.2. All welding shall be accomplished IAW American Welding Society (AWS) D1.1. Welders are to be AWS D1.1 qualified for the type and position of welding.

2.3.3. Lashing eyes shall be welded to the brow frame using full sized fillet welds 360 degrees around the eye base and the round bar to the base.

2.4. LIFTING AND HANDLING

2.4.1. A lifting plan that includes a diagram for lifting the Unit shall be provided by the

Designer/Contractor and must be approved by PNS prior to fabrication of the unit. This plan shall include the Unit’s weight (empty weight and full weight, if applicable), center of gravity location, Integral Lifting Attachment (ILA) details and the locations of each ILA.

The plan shall also include any basic lifting restrictions and any special allowances, including, but not limited to, minimum sling length, minimum sling capacity, or allowance for out-of-plane pulling on padeyes (if applicable), etc.

2.4.2. Threaded holes intended to be used as ILAs shall not be lubricated and shall be protected by removable threaded plugs or similar when not in use.

2.4.3. The padeye is the preferred ILA and it should be used when possible, provided it can be incorporated into the design of the Unit in a practical way. Examples of padeyes and the preferred rigging configuration using padeyes are provided in Figures 1 and 2.

2.4.4. Material used for the purposes of manufacturing an ILA shall be steel or aluminum.

2.4.5. The ILAs must be situated/located on the brow so that the brow can be lifted using standard rigging equipment such as shackles, swivel hoist rings and slings. A spreader bar is not to be utilized for lifts of the brow.

2.4.6. ILAs must be designed to allow for the proper connection of standard rigging gear as provided by ASME B30.26. ILAs shall not be solely designed for direct connection into a hook.

2.4.7. ILAs must be oriented so that the worst case forces that result when the brow is lifted do not cause stresses that exceed the allowable stresses provided herein. Specifically, if padyes are used as ILAs they should be oriented on the brow so that the resulting direction of pull exerted by the rigging equipment lies within 5 degrees (10 degrees included angle) of the plane formed by the padeye plate. If the designed or intended use of padeye requires the applied load to be directed out of plane with the padeye plate (greater than 5 degrees), the padeye must be designed so that such loading (under worst case conditions) does not result in stresses which exceed the allowable stresses described herein and marking/documentation provided to indicate that out of plane loading is acceptable.

2.4.8. The Designer of the ILAs shall be a Qualified Engineer.

2.4.9. All calculations shall be reviewed by a Qualified Engineer other than the Designer.

2.4.10. Design lifting attachments to accept standard rigging hardware or handling equipment

(ASME B30.26 equipment).

2.4.11. The WLL of each ILA shall be sized based on the worst case loading that it may be required to resist, based on the location of a ILA relative to the Unit’s center of gravity and the other ILAs, on the maximum angle from vertical formed by the lifting slings, and on the ability for the connected rigging gear to equalize between structurally redundant connections (when 4 slings are used to lift the Unit). In arrangements where 4 ILAs are used, each ILA must be designed so that either pair of diagonally opposed ILAs are capable of supporting the entire load of the Unit (with the force magnifying effects of sling angles being considered) without infringing on the safety factors stipulated herein. See Figure 4.

2.4.12. The WLL of each ILA shall be sized to provide a margin between the WLL and the actual (expected) loading. See Table 1 for minimum margin requirements. Additional margins should be considered for integral attachments subjected to situations with the potential for increased loading (e.g., binding or hang-ups due to seals of tight tolerances, additional weight in buildings/enclosures or fluid filled voids, etc.).

Table 1: Minimum Required Margins Between WLL And Actual Load Weight Total Item Weight (lb.) WLL of Integral Attachment1 Less than 1,000 +200 lb2 OR 200% (whichever is greater) 1,000 – 10,000 150% 10,001 – 100,000 125%3

Greater than 100,000 115%

NOTES:

1. Percentages shown are of expected load exerted on the integral attachment.

2. Total Item Weight + 200 lb.

3. Percentage may be reduced to 115 percent IF the weight of the item is known (not estimated) AND the potential for binding or added weight does not exist.

2.4.13. ILAs shall be designed using an allowable stress which is the lower of the two values resulting from a safety factor of 3.0 with respect to yield strength (FY) or 5.0 with respect to ultimate strength of the material (FU). A factor of 0.6 shall be applied to any allowable shear stress. For example, the allowable stress for double shear plane tear-out of a padeye hole would be either (0.6)(FY)/3.0 or (0.6)(FU)/5.0, whichever is more restrictive.

2.4.14. Any welds shall be designed per AWS Specification D1.1 with the following exceptions:

Welds shall be designed with a safety factor of 5.0 with respect to the ultimate strength of the weld metal or base metal as applicable. A factor of 0.6 shall be applied to any allowable shear stress. For example, the allowable stress of a fillet weld shall be (0.6)(Fu)/5.0, since fillet welds are generally assumed to fail in shear, where Fu is the ultimate strength of the weld filler material or the base metal as applicable. The allowable stresses provided here apply only to the failure modes, which directly relate to the ILA and the connecting weld joint. These allowable stresses do not apply to any adjacent surrounding structure; however, such surrounding structure may be required to resist a one-time applied load equal to 210 percent of the WLL of the ILA in the cases where 200 percent load tests are required as provided herein.

2.4.15. Any ILAs (excluding threaded or through-holes installed directly into a structural element of the Unit) are to be connected to the brow using a welded joint which meets the requirements of paragraph 2.4.14. Welded joints connecting ILAs to the brow structure shall be designed using a continuous weld around the exterior of the joint (as a minimum) in order to prevent the entry of moisture into any interior un-bonded portion of the joint that may exist. Bolted joints that directly connect an ILA to the Unit are not permitted. This does not apply to bolted joints placed elsewhere in the structure of the Unit that do not serve as a structural connection directly between the ILA and the Unit.

Figure 1: Typical Padeyes

Figure 2: Standard (Preferred) Lifting Configuration

Figure 3: Maximum Allowable Tilt in Lift

Figure 4: Worst Case Loading When 4 ILAs are Used

2.5. TESTING

2.5.1. Any ILA attached via a weldment with a capacity greater than 6000 lbs. must receive a one-time 200 percent load test, which shall be administered by the contractor prior to delivery of the Unit.

2.5.2. The applied test load shall be 200 percent of the design capacity (WLL) with a tolerance of +5%/-0% of the test load. In other words, the applied test load shall be a minimum of 200 percent and a maximum of 210 percent of the design capacity (WLL) of the ILA. The test load shall be maintained for a period no less than 2 minutes.

2.5.3. The test load can be applied to each ILA individually or to multiple ILAs at once provided it can be shown through basic mechanics that each tested ILA received the proper test load value. Applied test load should mimic the as-used/as designed configuration to the maximum extent practicable, with alternate loading configurations approved by the designer.

2.5.4. A visual inspection for cracks, damage, or deformation shall be performed and documented after the load test.

2.5.5. Written documentation shall be provided by the contractor, which documents the completion of this test for each ILA listing the ILAs tested, actual applied load, test date, 2-minute test duration and signature of person performing the test. Documentation shall be submitted to PNS prior to shipment and delivery

2.5.6. The brow itself shall have a load proof test performed on it. This test will be conducted by simply supporting the brow (with and without removable sections if applicable) and dispersing 300 lbs. per linear foot across the total length. The test shall be held for 10 minutes. After removing the load the brow shall be inspected for cracking and buckling in all structural members. A load test report including test date, test procedure, weights used, and inspection findings shall be submitted to PNS prior to shipment and delivery.

2.6. MARKING REQUIREMENTS

2.6.1. Permanently identify (by stamping) each of the picking plates. Number as 1-1, 1-2, 1-3 etc.

By uniquely identifying each picking plate all required documentation will be matched with the right unit.

2.6.2. Each picking plate shall be permanently identified with its Certified Working Load Limit (WLL) as calculated in 2.4.11, [e.g., WLL=10,000 LB] by stamping, etching or by placing on a permanently attached label plate.

2.6.3. Each picking plate after receiving a load test shall also be permanently marked with the test date (i.e., by stamping, etching or by placing on a permanently attached label plate).

2.7. DOCUMENTATION

2.7.1. The contractor shall submit complete shop drawings for all parts of the work. No performance of the work shall commence without review of the shop drawings by the government technical code.

2.7.2. Provide structural stamped drawings and calculations.

2.7.3. Documentation, including MSDS must be included for all paints and insulation materials used. Lead based or chromium based paints are prohibited.

2.7.4. The weight of the brow (± 5%) shall be provided to Portsmouth prior to shipment of the brow.

2.7.5. The manufacturer will be required to provide calculations stamped by a professional engineer to verify the pick plates will meet or exceed the load test conditions and design criteria specified above. The certified calculations will be provided to Portsmouth Naval Shipyard for review prior to shipment and delivery.

2.7.6. Manufacturer will provide written load test certification to Portsmouth Naval Shipyard for review prior to shipment and delivery

2.7.7. A lifting plan that includes a diagram for lifting the Unit shall be provided by the Designer/Contractor/manufacturer and must be approved by PNS prior to fabrication of the unit. This plan shall include the brow’s weight, center of gravity location, picking plate details and the locations of each picking plate. The plan shall also include any basic lifting restrictions and any special allowances, including, but not limited to, minimum sling length, minimum sling capacity, or allowance for out-of-plane pulling on picking plates (if applicable), etc.

Figure 5