NSTS 08123 Cert of Flexhose-Belows Rev C.pdf

NSTS 08123

REVISION CNational Aeronautics and

Space Administration APRIL 12, 1994

Lyndon B. Johnson Space Center REPLACES Houston, Texas 77058 NSTS 08123

REVISION B

SPACE SHUTTLE

CERTIFICATION

OF FLEXHOSES AND BELLOWS

FOR FLOW INDUCED VIBRATION

REVISION LOG

REV

LTR

CHANGE

NO DESCRIPTION DATE

A

B

C

BASELINE ISSUE (Reference: Level II PRCBD S05203C, dated October 19, 1980) also includes S05203CR1.

Revision A (Reference: Level II PRCBD S40129, dated 7/23/86) also includes S40019R3, S40129R1 and S40481.

Revision B (Reference: Level II PRCBD S061230F, dated 1/2/91) also includes Change No. 2.

Revision C (Reference: SSP DOC–170, dated 2/15/94) also includes Space Shuttle PRCBD S052730A, SSP DOC–106 and Changes 4 and 5.

12/12/80

11/30/87

03/28/91

04/12/94

CHANGE NO. 13

CHANGE SHEET

FOR

NSTS 08123 – Space Shuttle Certification of Flexhoses and Bellows for Flow Induced Vibration

CHANGE NO. 13

Program Requirements Control Board Directive No. S005203N/(1–1), dated 11/22/00.(1)

December 15, 2000

Robert H. Heselmeyer Secretary, Program Requirements Control Board

CHANGE INSTRUCTIONS

1. Remove the following listed Deviation/Waiver (D/W) pages and replace with the same numbered attached D/W pages:

D/W Page PRCBD No.

(iii) S005203N (iv)

(1) – (2) S005203N

2. Remove the following listed pages and replace with the same numbered attached pages:

Page PRCBD No.

1–1 1–2 – 1–3 S005203N 1–4

A–7 A–8 – A–10 S005203N

NOTE: A black bar in the margin indicates the information that was changed.

3. Remove the List of Effective Pages, dated May 18, 2000 and replace with List of Effective Pages, dated December 15, 2000.

4. Sign and date this page in the space provided below to show that the changes have been incorporated and file immediately behind the List of Effective Pages.

Signature of person incorporating changes Date

NSTS 08123 – Space Shuttle Certification of Flexhoses and Bellows for Flow Induced Vibration

*Revision C (Reference PRCBD No. S052730A, dated 10/20/93; SSP DOC–106 and SSP

DOC–170)

LIST OF EFFECTIVE PAGES

December 15, 2000

The current status of all pages in this document is as shown below:

Page No. Change No. PRCBD No. Date

(i) – (ii) Rev. C * April 12, 1994

(iii) 13 S005203N November 22, 2000

(iv) Rev. C * April 12, 1994

(1) – (2) 13 S005203N November 22, 2000 i – ii Rev. C * April 12, 1994 iii 11 S061333 October 22, 1999, SSP DOC–425 April 27, 1999 iv – viii Rev. C * April 12, 1994 1–1 Rev. C * April 12, 1994 1–2 – 1–3 13 S005203N November 22, 2000 1–4 – 1–8 Rev. C * April 12, 1994 2–1 – 2–2 Rev. C * April 12, 1994 A–1 – A–7 Rev. C * April 12, 1994 A–8 – A–10 13 S005203N November 22, 2000

CHANGE NO. 13

DEVIATIONS/WAIVERS AUTHORIZED FOR REQUIREMENTS

CONTAINED IN THIS DOCUMENT

This section contains only currently approved Deviations/Waivers to the requirements of NSTS 08123. Deviations/Waivers to these requirements that were approved prior to the STS 51 -L accident have been rescinded and are retained in Appendix A of this volume for historical purposes.

NSTS 08123 (i) CHANGE NO. 6Revision C

THIS PAGE INTENTIONALLY LEFT BLANK

NSTS 08123 (ii) CHANGE NO. 6Revision C

INDEX OF DEVIATIONS/WAIVERS AUTHORIZED FOR REQUIREMENTS

CONTAINED IN THIS DOCUMENT

Number Title Para. No. Page

1. Rescinded (Reference Level II PRCBD Apx A (1) S40019R3, dated 8/26/87)

2. Retired (Reference Level II PRCBD Apx A (1) S005203GR1, dated 8/2/91)

3. Retired (Reference Space Shuttle PRCBD Apx A (1) S005203N, dated 11/22/00)

4. Retired per SSP DOC–451 Apx A (1) (Reference Space Shuttle PRCBD S005203K, dated 1/21/98)

NSTS 08123 (iii) CHANGE NO. 13Revision C

NSTS 08123 (iv) CHANGE NO. 6Revision C

DEVIATIONS/WAIVERS AUTHORIZED FOR REQUIREMENTS

CONTAINED IN THIS DOCUMENT

1. REQUIREMENT: Rescinded. (Reference Level II PRCBD S40019R3, dated 8/26/87). See Appendix A.

2. REQUIREMENT: Retired. (Reference Level II PRCBD S005203GR1, dated 8/2/91). See Appendix A.

3. REQUIREMENT: Retired. (Reference Space Shuttle PRCBD S005203N, dated 11/22/00). See Appendix A.

4. REQUIREMENT: Retired per SSP DOC–451. (Reference Space Shuttle PRCBD S005203K, dated 1/21/98). See Appendix A.

NSTS 08123 (1) CHANGE NO. 13Revision C

NSTS 08123 (2) CHANGE NO. 13Revision C

SPACE SHUTTLE

CERTIFICATION

OF FLEXHOSES AND BELLOWS

FOR FLOW INDUCED VIBRATION

NSTS 08123 ii CHANGE NO. 6 Revision C

FOREWORD

Efficient management of the Space Shuttle Program (SSP) dictates that effective control of program activities be established. Requirements, directives, procedures, interface agreements, and system capabilities shall be documented, baselined, and subsequently controlled by SSP management.

Program requirements controlled by the Manager, Space Shuttle Program, are documented in, attached to, or referenced from Volume I through XVIII of NSTS 07700.

This document is an extension of NSTS 07700, Volume X, Space Shuttle Flight and Ground Systems Specification. The certification requirements specified herein are applicable to both flight and ground systems at all launch, landing, and test sites utilizing SSP hardware. MSFC Drawing No. 20M02540 specifies the analytical methods to be employed in the design of flexhoses and bellows to preclude or minimize the effect of flow induced vibration. This document, NSTS 08123, specifies the requirements for certification which may necessitate flow testing. MSFC–SPEC–626 specifies the procedures for flow testing flexhoses and bellows. This requirement shall be implemented at each site and when necessary shall be reflected in both new and existing contracts.

All elements of the SSP must adhere to these baselined requirements. When it is considered by the Space Shuttle Program element/project managers to be in the best interest of the SSP to change, waive or deviate from these requirements, an SSP Change Request (CR) shall be submitted to the Program Requirements Control Board (PRCB) Secretary. The CR must include a complete description of the change, waiver or deviation and the rationale to justify its consideration. All such requests will be processed in accordance with NSTS 07700, Volume IV – Book 1 and dispositioned by the Manager, Space Shuttle Program, on a Space Shuttle PRCB Directive (PRCBD).

NSTS 08123 iii CHANGE NO. 11 Revision C

NSTS 08123 iv CHANGE NO. 6Revision C

CONTENTS

1.0 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1

1.1 SCOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1

1.2 FLIGHT SYSTEMS HARDWARE REQUIREMENTS . . . . . . . . . . . . . . . 1–1

1.3 GSE AND FACILITY HARDWARE REQUIREMENTS . . . . . . . . . . . . . . 1–2

1.4 RESONANT FLOW TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2

2.0 APPLICABLE DOCUMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1

NSTS 08123 v CHANGE NO. 6Revision C

APPENDICES

A ARCHIVED DEVIATIONS/WAIVERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–1

NSTS 08123 vi CHANGE NO. 6Revision C

TABLES

1.0 LIST OF DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–5

NSTS 08123 vii CHANGE NO. 6Revision C

FIGURES

1–1 FLOW CHART FOR FLIGHT HARDWARE CERTIFICATION . . . . . . . . . . . . . 1–7

1–2 FLOW CHART FOR GSE AND FACILITY HARDWARE

CERTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–8

NSTS 08123 viii CHANGE NO. 6Revision C

1.0 GENERAL

The occurrence of flow induced vibrations of metal bellows and flexhoses contained in fluid ducting systems has resulted in fatigue failures which have forced the premature shutdown of some critical fluid systems. These flow induced vibrations are a result of the coupling of vortex shedding from the convolutes with the natural frequencies of the flexible line. George C. Marshall Space Flight Center Drawing No. 20M02540, Revision E, Assessment of Flexible Lines for Flow Induced Vibration, provides a method for determining the susceptibility of metal bellows and flexhoses to flow induced vibrations.

The purpose of this document, NSTS 08123, is to provide the requirements for certifica-tion of metal bellows and flexhoses for use in the Space Shuttle Program.

Metal bellows and flexhoses with flow liners that preclude flow induced vibration are excluded from this specification. Flexhoses and bellows with steady–state flow of less than one second duration are also excluded from this specification.

The methods for certification, as identified herein, are based upon the philosophy of avoiding those flow ranges which produce flow induced vibrations.

1.1 SCOPE

This document specifies the requirements for certification of all metal bellows and flex-hoses located in flight and ground systems (Ground Support Equipment [GSE] and facilities) for flow induced vibrations. The MSFC Drawing No. 20M02540, Revision E, shall be used in conjunction with this document for analyzing a design for susceptibility to flow induced vibrations. For those bellows or flexhose designs (i.e., welded disc, ring reinforced, toroidal, etc.) which cannot be analyzed by the MSFC Drawing No. 20M02540, Revision E, some other approved analysis or testing must be done.

In determining the acceptability of hardware, the analytical procedures found in MSFC Drawing No. 20M02540, Revision E, can be considered of having two phases.

Phase I – Calculate the flow range at which coupling between flow vortices and the natural frequencies of the bellows or flexhose will occur.

Phase II – If Phase I predicts coupling, calculate the stress at the critical flow velocity to assess the life of the bellows or flexhose.

A flow chart is presented in Figure 1–1 and Figure 1–2 depicting the process for certifi-cation.

1.2 FLIGHT SYSTEMS HARDWARE REQUIREMENTS

The following requirements are applicable to all flight hardware regardless of criticality category. When Phase I predicts that no flow induced vibration due to coupling exists

NSTS 08123 1–1 CHANGE NO. 6Revision C over the operating flow range expected (± 10%), the hardware is acceptable for certifi-cation. When Phase I predicts coupling to occur in the operating flow range, a redesign is necessary to preclude flow induced vibration or a Resonant Flow Test is required to show an infinite life. This flow test to show infinite life shall consist of dwelling at the most severe resonant conditions until the number of cycles equivalent to four times the operational life have been accumulated at each resonance. If the bellows or flexhose survives this flow test (i.e., shows no indication of fluid leakage or detrimental damage), it can then be certified for flight.

EXCEPTION: Use of the LH2 external feed bellows and the LH2 internal bellows with three SSMEs at a power level up to and including 106%.

1.3 GSE AND FACILITY HARDWARE REQUIREMENTS

For all GSE and facility components where the Criticality is 1 or 2 (based on formal Failure Mode and Effect Analysis [FMEAs]) then certification is the same as for flight hardware (see Paragraph 1.2).

If the component Criticality is 3 or is non–critical and Phase I predicts coupling, Phase II shall be performed to determine the life of the bellows or flexhose. In performing the Phase II calculations a factor of 5 shall be applied to the corrected stress value (FISC) in MSFC Drawing No. 20M02540, Revision E. This factor of 5 is in addition to the uncertainty factors used in MSFC Drawing No. 20M02540, Revision E. If Phase II pre-dicts an infinite life, the bellows or flexhose can then be certified for use. However, the maximum operating flow velocity through the flexible line shall be limited as set forth in MSFC Drawing No. 20M02540, Revision E. If Phase II predicts a finite life, then a rede-sign is necessary to achieve a predicted infinite life or a Resonant Flow Test is required to show an infinite life. This flow test to show infinite life shall consist of dwelling at the most severe resonant conditions until the number of cycles equivalent to four times the operational life have been accumulated at each resonance. If the bellows or flexhose survives this flow test (i.e., shows no indication of fluid leakage or detrimental damage), it can then be certified for use.

It is recognized that ground systems may be Criticality 1 or 2 while their individual com-ponents may be Criticality 3 or noncritical.

1.4 RESONANT FLOW TEST

A Resonant Flow Test is defined as one in which the bellows or flexhose is instru-mented with strain gages, accelerometers, proximity probes and/or pressure pickups. A Resonant Flow Test consists of two parts. The first part is a resonance search test to determine if flow coupling occurs and, if so, at what flowrate and frequency. The second part is a resonance dwell test to determine the life of the flexible line while

NSTS 08123 1–2 CHANGE NO. 13Revision C flowing under resonant conditions. The Resonant Flow Test shall be conducted in accordance with MSFC–SPEC–626, Basic, Test Control Document for Assessment of Flexible Lines for Flow Induced Vibration.

NSTS 08123 1–3 CHANGE NO. 13Revision C

NSTS 08123 1–4 CHANGE NO. 6Revision C

TABLE 1.0

LIST OF DEFINITIONS

Criticality 1 – Loss of life or injury to personnel, or loss of vehicle.

Criticality 2 – Loss of mission including both post–launch abort and launch delay suffi-cient to cause mission scrub.

Criticality 3 – All others.

Free Bellows – Where convolutes have unrestricted movement when exposed to fluid flow impingement.

Flexhose – A flexible metal hose where convolutes are partially restrained at the crown by wire braid.

Flexible Line – A metal bellows or flexhose assembly that joins two duct sections and permits relative motion between the ducts in one or more planes.

Operational Life – The time accrued when the number of missions is multiplied by the mission system operation time plus any ground checkout operations.

Resonant Flow Test – See Paragraph 1.4.

NSTS 08123 1–5 CHANGE NO. 6

NSTS 08123 1–6 CHANGE NO. 6

FIGURE 1–1

FLOW CHART FOR FLIGHT HARDWARE CERTIFICATION

FLIGHT SYSTEMS

PHASE I

DECISION

REDESIGN

ACCEPTABLE FOR

CERTIFICATION

PASS/FAIL

DECISION

RESONANT

FLOW TEST

P A

S S

E D

C O

U P

LI

N

G

FAILED

NO COUPLING

NSTS 08123 1–7 CHANGE NO. 6

FIGURE 1–2

FLOW CHART FOR GSE AND FACILITY HARDWARE CERTIFICATION

GSE AND FACILITY SYSTEMS

PHASE I

DECISION

REDESIGN

ACCEPTABLE FOR

CERTIFICATION

PASS/FAIL

DECISION

RESONANT

FLOW TEST

P A

S S

D

C O

U P

LI

N

G

FAILED

NO COUPLING

PHASE II

CRITICALITY

INFINITE LIFE

O R

F

IN

IT

E

L

IF

NSTS 08123 1–8 CHANGE NO. 6

2.0 APPLICABLE DOCUMENTS

The following documents of the date and issue shown form a part of this document to the extent specified herein. “(Current Issue)” is shown in place of a specific date and issue when the document is under Space Shuttle PRCB control. The current status of documents shown with “(Current Issue)” may be determined from NSTS 08102, Pro-gram Document Description and Status Report.

NSTS 07700

Volume IV (Current Issue)

Configuration Management Requirements

Ref. Foreword

NSTS 07700 Space Shuttle Flight and Ground System Volume X Specification (Current Issue)

Ref. Foreword

MSFC DWG Assessment of Flexible Lines for Flow No. 20M02540 Induced Vibration Revision E

Ref. Para. 1.0, 1.1, 1.3

MSFC–SPEC–626 Test Control Document for Assessment of Basic Flexible Lines for Flow Induced Vibration

Ref. Para. 1.4

NSTS 08123 2–1 CHANGE NO. 6

NSTS 08123 2–2 CHANGE NO. 6

APPENDIX A

ARCHIVED DEVIATIONS/WAIVERS

NSTS 08123 A--1 CHANGE NO. 6Revision C

NSTS 08123 A--2 CHANGE NO. 6Revision C

APPENDIX A

ARCHIVED DEVIATIONS/WAIVERS

1.0 PURPOSE AND SCOPE

The purpose of this Appendix is to retain those Deviations/Waivers rescinded as a result of the STS 51 -L accident and retired due to the expiration of effectivity.

1.1 RESCINDED DEVIATIONS/WAIVERS

The Deviations/Waivers contained in the section were approved prior to STS -51L. Any of these Deviations/Waivers that apply to future Space Shuttle missions must be resub-mitted with appropriate rationale for SSP approval and reinstatement.

NSTS 08123 A--3 CHANGE NO. 6Revision C

ARCHIVED DEVIATIONS/WAIVERS AUTHORIZED FOR REQUIREMENTS

CONTAINED IN THIS DOCUMENT

1. REQUIREMENT: Paragraph 1.2 (and Paragraph 1.3 by reference) specifies as follows:

WAIVER:

When Phase I predicts coupling to occur in the flow range, a redesign is necessary to preclude flow induced vibration or a Resonant Flow Test is required.

The use of the following items of equipment is authorized, based on the non -critical nature of the component in its respective system, past usage, or an instrumented flow test.

KSC LAUNCH AND LANDING

PART NO.

A64003

A64004

A64005

A64030

A64031

A64032

A64033

A64034

A64035

A64036

A64037

A13147

A100740

A131140

SYSTEM

MPS/LH2

MPS/LH2

MPS/LH2

MPS/LH2

MPS/LH2

MPS/LH2

MPS/LH2

MPS/LH2

MPS/LH2

MPS/LH2

MPS/LH2

MPS/LH2

MPS/LH2

MPS/LH2

DESCRIPTION

10I VO GIMBAL JOINT

10I VO GIMBAL JOINT

10I VO GIMBAL JOINT

18I EXPANSION JOINT

ET VENT

18I EXPANSION JOINT

ET VENT

18I EXPANSION JOINT

ET VENT

18I EXPANSION JOINT

ET VENT

18I EXPANSION JOINT

ET VENT

18I EXPANSION JOINT

ET VENT

18I EXPANSION JOINT

ET VENT

18I EXPANSION JOINT

ET VENT

8I VJ TSM HOSE

(MLP -1 ON)

1 1/2I VJ FLEXHOSE

IN TSM

1 1/2I VJ FLEXHOSE

IN TSM

JUSTIFICATION

NON -CATASTROPHIC,

PAST USAGE

NON -CATASTROPHIC,

PAST USAGE

NON -CATASTROPHIC,

PAST USAGE

NON -CATASTROPHIC

NON -CATASTROPHIC

NON -CATASTROPHIC

NON -CATASTROPHIC

NON -CATASTROPHIC

NON -CATASTROPHIC

NON -CATASTROPHIC

NON -CATASTROPHIC

NON -CATASTROPHIC

NON -CATASTROPHIC

NON -CATASTROPHIC

NSTS 08123 A--4 CHANGE NO. 6Revision C

ARCHIVED DEVIATIONS/WAIVERS AUTHORIZED FOR REQUIREMENTS

CONTAINED IN THIS DOCUMENT - Continued

KSC LAUNCH AND LANDING - Concluded

PART NO. SYSTEM DESCRIPTION JUSTIFICATION

A131143 MPS/LH2 1 1/2I VJ FLEXHOSE NON -CATASTROPHIC

IN TSM

A100812 MPS/LH2 8I VJ FLEXHOSE IN NON -CATASTROPHIC

GH2 VENT

A64404 MPS/LO2 6I VJ GIMBAL JOINT NON -CATASTROPHIC

DRAIN

A64405 MPS/LO2 6I VJ GIMBAL JOINT NON -CATASTROPHIC

DRAIN

A64406 MPS/LO2 6I VJ GIMBAL JOINT NON -CATASTROPHIC

DRAIN

A66495 MPS/LO2 8I VO FLEXHOSE IN NON -CATASTROPHIC

TSM

A66496 MPS/LO2 8I VO FLEXHOSE IN NON -CATASTROPHIC

TSM

A626042 FC/LOA GO2 FLEXHOSE NON -CATASTROPHIC

A625653 FC/LOA GH2 FLEXHOSE NON -CATASTROPHIC

A125090 FC/LOA GH2 FLEXHOSE NON -CATASTROPHIC

A125066 FC/LOA LH2 FLEXHOSE NON -CATASTROPHIC

A12509 FC/LOA LH2 FLEXHOSE NON -CATASTROPHIC

MSFC/NSTL ENGINE TEST STANDS A1 AND A2

PART NO. SYSTEM DESCRIPTION JUSTIFICATION

EJ -1A12 -LO A1/LO2 8I EXPANSION JOINT NON -CATASTROPHIC,

PAST USAGE

EJ -1A13 -LO A1/LO2 8I EXPANSION JOINT NON -CATASTROPHIC,

PAST USAGE

EJ -1A14 -LO A1/LO2 10I EXPANSION JOINT NON -CATASTROPHIC,

PAST USAGE

EJ -1A01 -LO A1/LO2 8I EXPANSION JOINT NON -CATASTROPHIC,

PAST USAGE

LH -1206 A -2/LH2 12I EXPANSION JOINT NON -CATASTROPHIC,

PAST USAGE

EJ -2A17 -LO A -2/LO2 6I EXPANSION JOINT NON -CATASTROPHIC,

PAST USAGE

EJ -2A18 -LO A -2/LO2 6I EXPANSION JOINT NON -CATASTROPHIC,

PAST USAGE

EJ -2A20 -LO A -2/LO2 10I EXPANSION JOINT NON -CATASTROPHIC,

PAST USAGE

NSTS 08123 A--5 CHANGE NO. 6Revision C

ARCHIVED DEVIATIONS/WAIVERS AUTHORIZED FOR REQUIREMENTS

CONTAINED IN THIS DOCUMENT - Continued

MSFC/NSTL ENGINE TEST STANDS A1 AND A2 - Concluded

PART NO. SYSTEM DESCRIPTION JUSTIFICATION

EJ -2A21 -LO

EJ -2A22 -LO

A -2/LO2

A -2/LO2

10I EXPANSION JOINT

8I EXPANSION JOINT

NON -CATASTROPHIC,

PAST USAGE

NON -CATASTROPHIC,

PAST USAGE

MSFC/EXTERNAL TANK PROJECT

PART NO. SYSTEM DESCRIPTION JUSTIFICATION

PD4800184

PD4800175

PD4800177

LH2

LO2

LH2

LH2 EXTERNAL FEED

BELLOWS

LO2 FEEDLINE FLEX

BELLOWS

LH2 INTERNAL BELLOWS

INSTRUMENTED FLOW

TESTS AT MMC WILL

VERIFY ACCEPTABLE

STRESS LEVELS.

AUTHORITY: Level II PRCBDs S05203CR1, dated S40019R3, dated 8/26/87.

11/28/80 and

NSTS 08123 A--6 CHANGE NO. 6Revision C

ARCHIVED DEVIATIONS/WAIVERS AUTHORIZED FOR REQUIREMENTS

CONTAINED IN THIS DOCUMENT – Continued

1.2 RETIRED DEVIATIONS/WAIVERS

The Deviations/Waivers contained in this section have been removed from the list of active Deviations/Waivers because of expiration of effectivity.

NSTS 08123 A–7 CHANGE NO. 6Revision C

2. REQUIREMENT: Paragraph 1.2 FLIGHT SYSTEMS REQUIREMENTS, (and Paragraph 1.3 by reference) specifies as follows:

When Phase I predicts coupling to occur in the flow range, a redesign is necessary to preclude flow induced vibration or a Resonant Flow Test is required.

WAIVER: The use of the following items of equipment is authorized, for ETs –23, 27, 28, 29, 31 thru 41, and 46, based on past usage, as instrumented flow test or analysis.*

PART NO. SYSTEM DESCRIPTION JUSTIFICATION

PD4800184 LH2 LH2 External Feed The argon jacketed bellows Bellows on the LH2 external feedline on MPTA has been visually inspected and photographed while loaded to detect evidence of bellows failure possibly caused by flow induced vibration. No failures have been found through SF–12.

PD4800177 LH2 LH2 Internal Strain gage measurements Bellows from instrumentation on the

LH2 internal bellows on MPTA have been analyzed for flow rates up to 102%. No flow induced vibration has occurred during testing through SF–12.

* The LH2 internal and external feedline bellows have infinite life up to and including 109% power level.

AUTHORITY: Level II PRCBDs S05203G, dated 9/10/88 and S005203GR1, dated 8/2/91.

3. REQUIREMENT: Paragraph 1.2 FLIGHT SYSTEMS HARDWARE REQUIRE- MENTS. The following requirements are applicable to all flight hardware regardless of criticality category. When Phase I predicts that no flow induced vibration due to coupling exists over the operating flow range expected (± 10%), the hardware is acceptable for certification. When Phase I predicts coupling to occur in the operating flow

NSTS 08123 A–8 CHANGE NO. 13Revision C range, a redesign is necessary to preclude flow induced vibration or a Resonant Flow Test is required to show an infinite life. This flow test to show infinite life shall consist of dwelling at the most severe resonant conditions until the number of cycles equivalent to four times the operational life have been accumulated at each resonance. If the bellows or flexhose survives this flow test (i.e., shows no indication of fluid leakage or detrimental damage), it can then be certified for flight.

WAIVER: The use of the following items of equipment is authorized for external tanks 42–45, 47 and subs, based on past usage, instrumented flow test, or analysis.*

Part Number System Description

PD4800184 LH2 LH2 External Feed Bellows

PD4800177 LH2 LH2 Internal Bellows

RATIONALE: The argon jacketed bellows on the LH2 external feedline on MPTA has been visually inspected and photographed while loaded to detect evidence of bellows failure possibly caused by flow induced vibration. No failures have been found through SF–12.

Strain gauge measurements from instrumentation on LH2 internal bellows on MPTA have been analyzed for flow rates up to 102%. No flow inducted vibration has occurred during testing through SF–12.

* The LH2 internal and external feedline bellows meet the life requirements for flight up to and including 104%.

EFFECTIVITY: ET–42 thru ET–45, ET–47 thru ET–999

AUTHORITY: Level II PRCBD S0052023GR1, dated 8/2/91.

4. REQUIREMENT: Paragraph 1.2 FLIGHT SYSTEMS HARDWARE REQUIRE- MENTS. The following requirements are applicable to all flight hardware regardless of criticality category. When Phase I predicts that no flow induced vibration due to

NSTS 08123 A–9 CHANGE NO. 13Revision C

CONTAINED IN THIS DOCUMENT – Concluded

WAIVER:

RATIONALE:

EFFECTIVITY:

AUTHORITY:

coupling exists over the operating flow range expected (± 10%), the hardware is acceptable for certification. When Phase I predicts coupling to occur in the operating flow range, a redesign is necessary to preclude flow induced vibration or a Resonant Flow Test is required to show an infinite life. This flow test to show infinite life shall consist of dwelling at the most severe resonant conditions until the number of cycles equivalent to four times the operational life have been accumulated at each resonance. If the bellows or flexhose survives this flow test (i.e., shows no indication of fluid leakage or detrimental damage), it can then be certified for flight.

The above requirement is waived for the following items of equipment based on past usage, instrumented flow test or analysis.

Part Number System Description

PD4800184 LH2 LH2 External Feed Bellows

PD4800177 LH2 LH2 Internal Bellows

The argon jacketed bellows on the LH2 external feedline on MPTA has been visually inspected and photographed while loaded to detect evidence of bellows failure possibility caused by flow induced vibration. No failures have been found through SF–12.

Strain gauge measurements from instrumentation on the LH2 internal bellows on MPTA have been analyzed for flow rates up to 102%. No flow induced vibration has occurred during testing through SF–12.

The LH2 internal and external feedline bellows meet the life requirements for flight up to and including 104.5%.

ET–90 and ET–96

Space Shuttle PRCBDs S005203K, dated 1/21/98 and S005203KR2, dated 5/19/98.

NSTS 08123 A–10 CHANGE NO. 13Revision C

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Bookmarks Passed Bookmarks are present in large documents

Color contrast Passed manually Document has appropriate color contrast

Page Content

Rule Name Status Description

Tagged content Passed All page content is tagged

Tagged annotations Skipped All annotations are tagged

Tab order Passed Tab order is consistent with structure order

Character encoding Passed Reliable character encoding is provided

Tagged multimedia Passed All multimedia objects are tagged

Screen flicker Passed Page will not cause screen flicker

Scripts Passed No inaccessible scripts

Timed responses Passed Page does not require timed responses

Navigation links Passed Navigation links are not repetitive

Forms

Rule Name Status Description

Tagged form fields Passed All form fields are tagged

Field descriptions Passed All form fields have description

Alternate Text

Rule Name Status Description

Figures alternate text Passed Figures require alternate text

Nested alternate text Passed Alternate text that will never be read

Associated with content Passed Alternate text must be associated with some content

Hides annotation Passed Alternate text should not hide annotation

Other elements alternate text Passed Other elements that require alternate text

Tables

Rule Name Status Description

Rows Passed TR must be a child of Table, THead, TBody, or TFoot

TH and TD Skipped TH and TD must be children of TR

Headers Failed Tables should have headers

Regularity Skipped Tables must contain the same number of columns in each row and rows in each column

Summary Skipped Tables must have a summary

Lists

Rule Name Status Description

List items Passed LI must be a child of L

Lbl and LBody Passed Lbl and LBody must be children of LI

Headings

Rule Name Status Description

Appropriate nesting Skipped Appropriate nesting

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