RESPONSE_TO_BIDDER_QUESTIONS_5-31-18.docx

80KSC018R0016

QUESTION & ANSWERS 5/30/18

RESPONSE TO BIDDER QUESTIONS:

1. REFERENCE: Specification 79K40362; Section 43 42 41.99 Para 2.1.3.2d QUESTION: Para 2.1.3.2d requires an additional ¼ inch wall thickness within 5’ of all cryogenic line penetrations. Please confirm that only the shell thickness would require an additional ¼” and not an additional ¼” thickness on the nozzle wall, and that this additional ¼” can be considered as part of the reinforcement area provided. We would also like to request that this 5’ dimension be decreased to twice the nominal pipe size, which is the ASME code limit for reinforcement.

ANSWER: Yes, the added wall thickness is only for the carbon steel outer sphere exterior, not for the stainless steel nozzle wall thicknesses, as this subpart refers to the outer sphere. Yes, it counts towards reinforcement area. No, the reinforcement within 5 feet of the cryogenic line penetrations cannot be reduced. The requirement was established based upon experience at KSC with moisture and frost build-up on the exterior of outer spheres of cryogenic storage vessels due to proximity to cryogenic temperatures at these penetrations.

1. REFERENCE: Spec: 79K40632; Sec: 40 29 98; Para: 2.2.1 QUESTION: Paragraph 2.2.1, Section 40 29 98, Spec. 79K40632 states all seamless Type 316L S.S. ASTM B312 piping material to have a minimum wall thickness of Sch. 10 “unless otherwise specified”.

Drawing 79K40361, Zones C-7 and D-7 states the double walled vent pipe is to consist of 12” Sch. 10 and 10” Sch. 10 material rolled on a 43’-8” radius. However, we are being informed by Pipe rolling shops we utilize that such a thin wall will lead to excessive ovality, possibly in excess of 5%. That, in turn, will make it problematic at best to assemble to the “pipe within a pipe” configuration.

The ovality issue can be eliminated for all practical purposes by changing the tank vent piping schedule from Sch. 10 (as specified) to Sch. 40.

Is Schedule 40 pipe allowable for the vent stack?

ANSWER: Yes. Schedule 40 pipe exceeds the requirement. Schedule 10 pipe was the minimum requirement established for corrosion allowance.

1. REFERENCE: Specification Section 43 42 41.99, Item 3.5 Acceptance Standards

QUESTION: First paragraph states that water for testing is to be provided by vendor. Where is water available at this site? What can we expect for water connections at site? What is the cost associated with water usage?

ANSWER: Solicitation 80KSC018R0016 SF1442 Continuation Clause I.12 states no utilities will be provided to the contractor. Any water required to be used by Specification 79K40362 Section 43 42 41.99 is required to be demineralized water, as specified therein. The only water available in this location is non-potable water.

1. REFERENCE: DWG: 79K40361; Sheet 7 & 11 (drawings FP-102 & FP-302 and also drawing C-161 / sheet 18) QUESTION: A 16” FP main is shown to feed the LH2 Sphere area off of a 12” underground main. Is this the correct sizing for the new pipe and associated aboveground valve station? Please confirm. Additionally, for testing on the underground tie-in, will an operational pressure test suffice since upstream and downstream isolation and integrity are not clearly established on the drawings? Please advise.

ANSWER: Yes, 16"-diameter is the correct main size for this section. The primary reason is to increase cross sectional area to keep velocity below 20 feet per second for this underground section and the riser based upon the expected flow required. Upstream piping supplying the new 16"-diameter piping is a 12"-diameter loop. The 12"-diameter loop is fed from a 20"-diameter single feed.

Refer to testing requirements in Specification 79K40362 Section 21 13 26.00 99 Subpart 3.6.2.

1. REFERENCE: Spec: 79K40362; Sec: 43 42 41.99; Par: 3.1.6

QUESTION: What is the acceptance criteria for the Weld Impact Tests at minus 452 degrees Fahrenheit that has to be met?

ANSWER: Assuming full size sample and the materials anticipated, the ASME Section VIII UHA-51(a)(3)(-b) criteria would be used for acceptance..

1. REFERENCE: DWG: Spec: 79K40362; Sec: 43 42 41.99; Par: 3.1.6 QUESTION: Does this also apply to the heat exchanger subcontractor?

ANSWER: Yes, the ASME Section VIII UHA-51(a)(3)(-b) criteria also apply to the heat exchanger subcontractor. Refer to Specification 79K40362 Section 40 29 98. The vaporizers are grouped under non-vacuum jacketed piping.

1. REFERENCE: Spec: 79K40362; Sec 43 42 41.99; Par 3.3.2 QUESTION: What is intent for the digital recording of all wetted surfaces? Does this include plate surfaces in addition to welds? Does it also include internals such as the ladder and heat exchanger? Does taking pictures with a digital camera satisfy this requirement? If so, what is the maximum area allowed to be recorded in one image?

ANSWER: The purpose is to have a visual record of surfaces that will not be capable of being seen once liquid hydrogen is introduced into the vessel. It is not intended as a means to conduct quantifiable quality assurance testing. The techniques can vary, but it can be expected that the piping boroscope would produce a movie rather than still pictures. For the vessel interior, stills would be expected and would include individual photos of each penetration and attachment. The quality of the image would determine the maximum area that can be recorded.

1. REFERENCE: Drawing Vol. 2 E-748 Fire Suppression Cable Schedule, Cable Reference Designator 36032W7 and 36033W7

QUESTION: Who is providing and installing these cables?

ANSWER: The construction contractor is to provide and install these cables.

1. REFERENCE: Drawing Vol. 2 E=609 LH2 RIO Cable Schedule, ID# LH2 -11, -12, -13, and -14.

QUESTION: We are unable to get a cost for these cables, because subassembly and cable type is shown as TBD. Can NASA supply the subassembly and cable type for bidding purposes?

ANSWER: These four cables are part of the flare stack vendor/manufacturer’s responsibility and are the interconnection between the flare stack propane control panel and the ignition system (ignitors and cabinet). Both end points equipment is the flare stack manufacturer’s responsibility as well. The flare stack manufacturer is required to provide these cables under Specification 79K40362 Section 43 99 99 Subpart 2.1.1.5 to make a complete flare stack system. The contractor should consult with their flare stack manufacturer for these cable types as they are a part of the flare system. NASA will require the TBD information from the contractor to help address labeling after award.

1. REFERENCE: Cable 120E3100001

QUESTION: ShawFlex is the only known manufacturer of this cable. Is ShawFlex an acceptable manufacturer? Will NASA be providing this cable?

ANSWER: Contractor to provide and install cable with the specified characteristics.

1. REFERENCE: Cable drawing 120E3400012

QUESTION: Not referenced in the drawings. Is it required?

ANSWER: This drawing is not required.

1. REFERENCE: Cable drawing 120E3405006

QUESTION: Not referenced in the drawings. Is it required?

ANSWER: This drawing is not required.

1. REFERENCE: E Series Drawings and 98985 Cable Reference Drawings & List QUESTION: Drawings show cable schedules for GSP (E-608), HGLDS (E-714), KGCS (T-004) & LH2 (E-609). 98985 Cable Reference Drawings have Cable Assembly Drawings KT02300D, KT-02434D & KT02540. These “KT” drawings have more cables shown on them than the cable schedules on the E Series drawings. Also, some of the termination reference designators shown on the KT drawings for the extra cables can’t be identified on the E Series drawings. Are these extra cables part of this contract?

ANSWER: No, only cables listed on the cable schedules in Drawing 79K40361 are required to be provided by the contractor.

1. REFERENCE: Spec Section 40 29 99 VJ Piping, 1.1.1 a, 2.1.1 & 3.2.2 QUESTION: 1.1.1a. states, Description of work Main Transfer Line HVJ-2A from the storage Dewar’s transfer line interface connection to, and including, the tie-in to the existing 10”x12” VJ line.

2.1.1 states, Main Transfer Line, HVJ-2A – normal fluid service Will the Main Transfer Line (HVJ-2A) classified a normal fluid service require 100% Radiography per 3.2.2 Radiography?

ANSWER: Yes, 100% radiography is required on all welds exposed to hydrogen, which includes welds in HVJ-2A inner pipe. Classifying the pipe section as normal fluid service applies to more than just radiography requirements, and does not prescribe ASME radiography minimums where the owner specifies something more for the pipe section.

1. REFERENCE: 79K40361, Sheet M-401, M-402 Flag Note F QUESTION: Can the contractor use the commodities from the 3000 PSI GHE HE-1-6200-3/4 x.065 & 3000 PSI GN2, GN-1-4400-1.25x.134 at the termination at panels LH2 Area GN2 Hazardous Purge Panel, LH2 Propellant Control Console, & LH2 Helium Purge Panel after tested, cleaned and installed for a source for all testing, cleaning and drying required for the tubing, piping & sphere per drawing and specifications?

ANSWER: No, Solicitation 80KSC018R0016 SF1442 Continuation Clause I.12 states no utilities will be provided to the contractor.