Attachment-8_SPC-HWX II_QuestionsandClarificationsForm_GovernmentResponses_A00002.xlsx
XLSX spreadsheet 25 KB Posted
- Solicitation number
- 70Z02325R93250001
About this file
This is a Questions and Answers document for the Special Purpose Craft - Heavy Weather 2nd Generation (SPC-HWX II) solicitation from the U.S. Coast Guard. The document contains 14 technical questions and government responses regarding design specifications, requirements, and clarifications for the boat construction.
Key clarifications include: delivery must be within 18 months of the first boat order or proposals will be considered non-compliant; the Design and Development Plan requires a 2-page summary in the 40-page narrative with full plan due 15 days after award; design pressures for the deck and deckhouse are based on operating environment and rollover scenarios; generators can shed AC loads during rollovers if vital power requirements are maintained; roll-over events are rare (approximately 1 per year) but rolls over 65 degrees are expected during surf operations; and full power must be maintained during extreme heel angles between 65-110 degrees. The document provides technical specifications regarding structural design calculations, electrical systems, and self-righting capabilities.
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Q&Rs
| Question No. | Reference | Questions | Responses |
| 1 | Spec 100-2.2.3: Pressures applied to the hull bottom for structural design calculations shall be as prescribed by the DNV-RU HSLC rules. | Is it intended that section 2.2.1 of DNV-RU-HSLC Pt.3 Ch.1 is to be applied in it's entierty, including the statement that "The design vertical acceleration acgi needs not be taken greater than 6.0g?" | Yes. |
| 2 | Solicitation Provisions | Is "Design and Development Plan" required to be in the narrative or included as an appendix? | The narrative portion of the submission is limited to 40 pages. Two of these pages should be a summary of the Design and Development Plan. The full Design and Development Plan is CDRL 068-001 is due 15 days after contract award. |
| 3 | N/A | Will the USCG hold off on providing question responses until after the 31 JAN deadline or will the USCG answer questions as they are received? | The USCG will answer questions in batches as answers are developed. You can expect updated documents after the question period as closed. Any updates to documents will be post on SAM.gov. |
| 4 | Evaluation Factors | Is not meeting the 18-month delivery requirement cause for disqualificiation? If not, how will a schedule that is longer than 18-months be evaluated? | SOW 040-7.1 requires delivery no later than 18 months after issuance of the first boat delivery order. Not proposing to meet the 18-month delivery time would be considered non-compliant. |
| 5 | Spec 100-2.2.4.2 | Background: The following technical paper Cohen, S.; D. Ghosh and D. Shepard., “Design and Construction of the U.S. Coast Guard's 47 ft. Self-Righting, Heavy Weather Rescue Craft,” SNAME Transactions, Vol. 98, 1990 (Table 6) gives design pressures for the 47 MLB as follows: Deck House Front 9.0 psi (20.75’ head) / Deck House Side 5.0 psi (11.5’ head) / Deck House Aft 3.0 psi (6.9’ head). While SPC-HWX II is to work in heavier waves/surf than 47’ MLBs, the 35’ required deckhouse head (100-2.2.4.2) for SPC-HWX II results in a much higher proportional increase in the design pressure than the increase in design wave height. |
| Question: Can the USCG provide the rationale on how this higher pressure requirement was developed? Would USCG consider using similar approach to the 47 MLB and reduce the deck and deckhouse design pressures, which may not be subject to direct 35’ waves nominally aft deck, deckhouse sides, side windows, and aft deckhouse faces? | The design pressures applied to the exterior decks and deckhouse are commensurate with the operating environment and factor in hydrodynamic loading during re-righting from a knockdown or roll-over event. Additionally, wave and sea loading are not limited to front impacts and may occur from any direction. While the cited paper describes the design of the 47 MLB, the actual as-built 47 MLB deckhouse structure exceeds the described design pressure by over 30%. Note that Spec 100-2.2.4.2 states "a design head of 35 feet from the still waterline minus the height of structure from the waterline" which establishes that the higher the structure is above the waterline, the lower the design head pressure. | |||
| 6 | Spec 311-1.4 | Is the "underway condition" specified the same as Cruising as defined in NAVSEA T9070-A3-DPC-010/310-1, Electrical Power Load Analysis (EPLA) for Surface Ships? | In this context "underway condition" is intended to mean any condition when the boat is not attached to shore power. SOW 085-7.1.8.3.4 requires that NAVSEA T9070-A3-DPC-010/310-1, Electrical Power Load Analysis (EPLA) for Surface Ships be used as guidance in preparing the EPLA. Spec 311-1.4 requires the generator be sized for the "worst-case underway condition" (as established by the offeror) in terms of electrical load, with a 10% margin. | |
| 7 | Factor 3 - Organization | Can the USCG define the intent of "critical components" within the Organization section so we can best address the requirement? | This is intentionally non-specific and will depend on the proposed boat. A "critical component" is any component the offeror feels presents elevated risk in meeting requirements or delivery schedule. | |
| 8 | Spec 051-5.2.1.3 | What defines the beginning and end of the 30 second duration of a rollover event? | The 30 second duration in Spec 051-5.2.1.3 is through 360 degrees of rotation beginning and ending in a level, upright position. You can assume 12 degrees per second for this rotation. |
Additionally, Self-Righting Capabilities in Spec 079-5.1 will be updated to:
079-5.1 [A0000X] The SPC-HWX II shall be designed to be self-righting in the intact condition and right itself from fully inverted (180 degrees) to upright (0 degrees) in less than 15 seconds.
| 9 | Spec 311-1.1 and 200-4.1.1 | The specification requires the generator to operate in the same manner as the main propulsion engine in a rollover event. However, gensets do not operate in the same manner as propulsion engines (e.g. idling). Is it acceptable for the genset to shed it's AC load in a rollover event and transfer power of critical AC circuits to a battery/inverter system? | Yes, it is acceptable for the genset to shed AC loads in a rollover event as long as vital power requirements of Table 313-1 are provided with uninterrupted power in accordance with Spec 300-1.5. Spec 320-1.3 requires that all Vital Power loads on 120 VAC power to be provided with a means to automatically receive power from the DC power distribution system when 120 VAC power is not available. |
| 10 | Spec 200-4.1.3 | How was the 110-degree roll angle at which the engines ramp down to idle established? | The 110 degree roll angle is based on Coast Guard experience operating other boats with self-righting capabilities (i.e. the 47 MLB) in similar operating environments. |
| 11 | Spec 233-3.2 | What is the expected frequency of rollover events, and knock-down events greater than 65 degrees of heel? | Full roll-over and knockdown events are historically very rare (approximately 1 per year for the 47 MLB fleet), however rolls greater that 65 degrees can be expected regularly, particularly during surf operations and training. |
| 12 | Spec 200-4.1.1 | Do USCG proceedures require an inspection of propulsion engines following a rollover or knock-down event? | Roll-over and knockdown events are historically very rare and in the case of a roll-over typically result in some damage to the boat. In the event of a roll-over, the crew will attempt to move to a location where it is safe to have crew members move around the boat and conduct an initial inspection of the boat’s condition and continue to monitor the condition while underway. Once the boat is safely moored, the boat will be fully inspected stem-to-stern for damage, and all machinery would be inspected and tested for proper operation. If the boat has particular post-roll-over procedures or inspections required by the manufacturer/OEM, those too would be conducted. Note that SOW 086-3.1.3.1 requires that the Boat Information Book (BIB) describe "the emergency systems and action to be taken" in the event of a capsizing event. |
| 13 | Spec 200-4.1.3 | A typical V-configuration diesel engine is subject to eventual loss of oil pressure during continuous operation at heel angles greater than 65 degrees. What is the expeccted maximum duration of operation at a heel angle between 65 and 110 degrees during a rollover or knock-down event? | Operations at extreme heel angles will typically be transient in nature and the duration driven largely by the geometry and righting moment of the boat as well as the operating environment / sea state. |
| 14 | Spec 200-4.1.3 | Would the USCG consider accepting of lower power (60% load for example) during operation at heel angles between 65 and 110 degrees? | No. No changes to the requirements are being made. The SPC-HWX II's extreme operating environment requires that adequate power be available to control the vessel at all times. This is particularly critical in cases where transient rolls are approaching 110 degrees. |
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&16RFP NO. 70Z02325R93250001 &16QUESTIONS AND CLARIFICATIONS FORM &16ATTACHMENT 8
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