Specifications - DWA Draft Tube Bulkhead Seals.pdf
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- Attached to
- DWA Tube Bulkhead Seals
- Solicitation number
- W912EF26QA074
About this file
This is a Bid Items List and Technical Specifications document for a federal procurement by the U.S. Army Corps of Engineers, Walla Walla District, for Dworshak Dam in Ahsahka, Idaho.
The procurement covers three line items: seven Bay 4-6 Bottom Section Draft Tube Bulkhead Seals (CLIN 0001), seven Bay 4-6 Top Section Draft Tube Bulkhead Seals (CLIN 0002), and twenty 5/8-inch Hollow Core Drill Bits with 1/2-inch shanks (CLIN 0003). The rubber seals must be full-molded type with J-bulb tops and sides and flat-type bottoms, featuring hot factory vulcanized corners. All seals must match dimensions specified in reference drawings DWP-1-5-2/2 and DWP-1-5-2/1 and be delivered without bolt holes. Rubber composition shall consist of natural rubber, synthetic polyisoprene, or a blend with reinforcing carbon black, zinc oxide, accelerators, antioxidants, vulcanizing agents, and plasticizers. Physical properties must meet ASTM standards, including tensile strength of 3,000 psi minimum, 450 percent elongation at break, durometer hardness of 60-70 Shore Type A, maximum 5 percent water absorption, maximum 30 percent compression set, and no cracking under ozone resistance testing. The drill bits are intended for cutting fastener holes in the seals. All items must be delivered FOB to Dworshak Project within eight weeks of contract award in durable wooden crates suitable for forklift offloading. Deliveries are restricted to Monday-Thursday, 6:30 AM-5:00 PM, excluding federal holidays. Each seal set shall be covered by the manufacturer's standard warranty of not less than one year.
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| File | Type | Posted |
|---|---|---|
| Drawings - b79v - 2025 and 2026.pdf | ||
| Solicitation - W912EF26QA074.pdf |
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Text version
DWORSHAK DAM
BID ITEMS LIST
DRAFT TUBE BULKHEAD SEALS
ITEM DESCRIPTION QTY UOM PRICE EXT PRICE
0001 Bay 4-6 Bottom Section Draft Tube Bulkhead Seal 7 Each 0002 Bay 4-6 Top Section Draft Tube Bulkhead Seal 7 Each 0003 Hollow Core Drill Bit 20 Each
DWORSHAK DAM
TECHNICAL SPECIFICATIONS
DRAFT TUBE BUKHEAD SEALS
1.0 INTENT
The following specifications pertain to the purchase of new draft tube bulkhead seals and hollow core drill bits for U.S. Army Corps of Engineers, Walla Walla District, Dworshak Dam, Ahsahka, Idaho (Dworshak Project).
2.0 SCOPE
The successful Offeror shall be required to construct the rubber seals according to the specification in Section 3.0 below and ship the seals and drill bits to Dworshak Project as required in Section 7.0, Shipment and Delivery.
3.0 CUSTOM RUBBER SEAL SPECIFICATIONS (CLIN 0001, 0002)
3.1 General Requirements
3.1.1 Bay 4-6 Bottom Section Draft Tube Bulkhead Seal (CLIN 0001)
The Contractor shall deliver seven (7) complete seal sets matching dimensions and seal details in drawings DWP-1-5-2/2 and DWP-1-5-2/1.
3.1.2 Bay 4-6 Top Section Draft Tube Bulkhead Seal (CLIN 0002)
The Contractor shall deliver seven (7) complete seal set matching dimensions and seal details in drawings
DWP-1-5-2/1.
3.2 Construction Requirements
3.2.1 Seal rubber as specified in section 3.3.1
3.2.2 The top and sides of each seal are J-Bulb molded seals, and the bottom is a flat-type seal.
3.2.3 All corners shall be hot factory vulcanized to match dimensions shown in the reference drawings.
3.2.4 Seals shall be supplied without bolt holes.
3.3 Construction Requirements
3.3.1 Rubber Seals
Rubber seals shall be of the full-molded type only. All corners shall be factory vulcanized, and all seal rubber shall be compounded of natural rubber, synthetic polyisoprene, or a blend of both, and shall contain reinforcing carbon black, zinc oxide, accelerators, antioxidants, vulcanizing agents, and plasticizers. Physical characteristics of the seals shall meet the following requirements:
PHYSICAL TEST TEST VALUE TEST METHOD
SPECIFICATION
Tensile Strength 3,000 psi (min.) ASTM D412, Method A Elongation at Break 450 percent (min.) ASTM D412 300 percent Modulus 900 psi (min.) ASTM D412 Durometer Hardness (Shore Type A) 60 to 70 ASTM D2240 Water Absorption* 5 percent by weight (max.) ASTM D471 Compression Set 30 percent (max.) ASTM D395, Method B Low Temp. Brittleness Non-Brittle 3’ @ -40 ASTM D2137, Method A Tensile Strength (after aging 48 hrs) 80 percent tensile strength ASTM D572
(min.)
Ozone Resistance (70 hrs @ 40 deg. C at 300 PPHM Ozone and 20% strain on specimen)
No Cracks ASTM D1149
4.0 DRILL BITS (CLIN 0003)
The contractor shall provide twenty (20) 5/8in Hollow Core Drill Bit with 1/2in Shank intended for cutting fastener holes in the new seals
5.0 DELIVERABLES
All seals and a dimensioned drawing of the seal (one per seal type) shall be delivered with the seals.
6.0 REFERENCE DRAWINGS
CLIN 0001, Bay 4-6 Bottom Section Draft Tube Bulkhead Seal DWP-1-5-2/2 (J-bulb and wedge seal details on DWP-1-5-2/1 are typical to the bottom section)
CLIN 0002, Bay 4-6 Top Section Draft Tube Bulkhead Seal
DWP-1-5-2/1
7.0 WARRANTY
Each set of seals shall be covered by the manufacturer’s standard warranty and not less than one year.
8.0 SHIPMENT AND DELIVERY
All items shall be delivered FOB to Dworshak Project within eight (8) weeks of contract award. The Contractor shall be responsible for packing and shipping the components in a manner that will preserve seal integrity and ensure undamaged and complete arrival to Dworshak Dam. The seals shall be shipped in a durable wooden crate cable of being offloaded via forklift. Deliveries shall only be made during normal Dworshak Project business hours, Monday–Thursday 6:30AM–5:00PM, excluding federal holidays.
All shipments shall be delivered to:
USACE Dworshak Project Attn: Contract Performance Specialist 1428 Northfork Drive Ahsahka, ID 83520 Ph. (208) 476-1296 Fax (208) 476-1227
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