ST-HL-AE-1734, Test Guideline for Vibration Testing of Diesel Generator Fuel Oil Supply Lines for South Texas Project Unit 1
| ML20212P207 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 08/19/1986 |
| From: | Maru H BECHTEL GROUP, INC. |
| To: | |
| Shared Package | |
| ML20212P198 | List: |
| References | |
| PROC-860819, ST-HL-AE-1734, NUDOCS 8609030033 | |
| Download: ML20212P207 (7) | |
Text
ATTACHMENT ST-HL-AE-l'73 N
_PAGE I OF 9 TEST GUIDELINE FOR VIBRATION TESTING OF r
DIESEL GENERATOR FUEL OIL SUPPLY LINES FOR SOUTH TEXAS PROJECT UNIT 1 AUGUST,1986 PREPARED BY: s n IrzaAu.
8 - L9 -86 Rari N. Maru JOB NO.14926-001 BECHTEL ENERGY CORPORATION l
8609030033 860029 i
PDR ADOCK 05000498 A
PDR l
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ATTACHMENT ST44L AE-17 PAGE JZ OF TEST GUIDELINE FOR VIBRATION TESTING OF DIESEL GENERATOR FUEL OIL SUPPLY LINES 1.0 TEST OBJECTIVE The primary objective of the vib' ration testing of the diesel generator fuel oil supply piping is to determine the potential for vibration induced fatigue that the fuel oil piping may experience over the operating life of the plant.
2.0 SCOPE OF TEST The following lines of all three diesel generators shall be tested.
a.
Fuel oil supply line from fuel storage tank to diesel generator.
1.
1"D01008WA3 2.
1"001009WA3 3.
1"D01010WA3 b.
Pipe line from diesel generator to fuel oil drain tank.
1.
1"001020XC7 2.
1"D01025XC7 3.
1"D01030XC7 c.
Line from fuel oil drain tank to fuel oil transfer pump.
1.
1"001021XC7 2.
1"D01026XC7 3.
1"D01031XC7 d.
Pipe lines from fuel oil transfer pump to 4" header.
1.
1"D01022WA3 2.
1"D01027WA3 3.
1"001032WA3 e.
Return lines from diesel generator to 4" header 1.
1"D01011WA3 2.
1"001012WA3 3.
1"D01013WA3 3.0 TEST METHOD Piping shall be monitored using portable vibration monitoring equipment to obtain quantitative measurements. The measured velocity levels will be evaluated with the following criteria. ' Measure the maximum velocity (Vmax) taking sufficient number of measurements at:
1 3562s/0109s
ATTACHMENT t
ST-HL-AE- /_7M l _PAGE 3 OF 7 TEST GUIDELINE FOR VIBRATION TESTING OF DIESEL GENERATOR FUEL OIL SUPPLY LINES (Continued) a.
Pipe nozzle of diesel generator and fuel oil transfer pump.
b.
Various segment in the Diesel Generator Fuel Oil piping system.
This measured velocity (Vmax) will be compared with allowable velocity (Vallow) as calculated from equation (2) of Section 4.0 to determine acceptability of the vibration motion as follows:
a.
For piping system in the vicinity between first support in the piping system and nozzle of the diesel generator and fuel transfer pump.
Ymax (Nozzle) + Ymax (Pipe) f Vallow b.
For other piping Ymax f Vallow If measured piping system fails using this simplified criteria, additional measurements, including frequency contents, acceleration values shall be made and more refined criteria must be used to evaluate measured data. The methods used shall conform to widely accepted programs for model analysis of piping vibration and to the vibratory stress limits of paragraph 4.0 The methods shall consider the effects of the multiple modes detected by test measurements.
Alternatively addition and/or adjustment of supports may be needed to the piping in question and then a retest perfonned to ensure compliance with the criteria.
4.0 VIBRATION ACCEPTANCE VALUE For steady-state vibration, the maximum calculated alternating stress intensity, Salt, shall be limited as defined below:
l For ASME Class 2 and 3 piping and ANSI B31.1 l
l K M 22 S,)
{j)
S
=
alt Z
of-where CE2 2 = 21 l
i stress intensification factor, as defined in Subsection NC
=
and ND of the ASME Code.
maximum zero to peak dynamic moment loading due to vibration M
=
only, or in combination with other loads as required by the system design specification.
section modulus of the pipe.
2
=
l l
2 l
3562s/0109s
ATTACHMENT ST HL.AE- /73V
__PAGE 4 OF 7 TEST GUIDELINE FOR VIBRATION TESTING OF DIESEL GENERATOR FUEL OIL SUPPLY LINES (Continued)
X allowable stress reduction factor: 1.3 for materials covered
=
by Figure I-9.1 of the ASME code.
o.8SA where SA is the alternating stress at 106 cycles Sel
=
from Figure I-9.1 of the ASME Code. The user shall consider the influence of temperature on the modulus of elasticity.
Using above equation, the expression for allowable peak velocity (from ANSI /ASME OM-3)
V,j g = C) C4 (1.456 x 10-3
)
(2) 3 where Vallow Allowable velocity
=
C1 a correction factor to compensate for the effect of
=
concentrated weights along the characteristic span of the pipe (see Figure 1.0)
C3 a correction factor accounting for pipe contents and
=
insulation 1.0 + WE + NINS
=
V W
where weight of bare pipe per unit length (lb/ft)
W
=
WE weight of the pipe contents per unit length (1bs/ft)
=
WINS the weight of the insulation per unit length (lb/ft)
=
1.0 without insulation either empty or containing steam
=
~
C4 correction factor for end conditions different from
=
fixed ends and configuration different from straight spans of pipe 1.33 for cantilever and simply supported span
=
i 0.74 for equal leg Z-bend
=
[= 0.83 for equal leg U-bend 3562s/0109s
ATTACHMENT ST HL AE 11.30 PAGE $ OF 7 TEST GUIDELINE FOR VIBRATION. TESTING 0F DIESEL GENERATOR FUEL OIL SUPPLY LINES (Continued) i stress intensification factor per ASME code
=
SA and oc = saine as in equation (1)
For screening vibration velocity'use:
Vallow 0.5 in./sec.
=
If measured vibration velocities are greater than 0.5 in/sec., then further analysis is required to determine the acceptability of the piping system as follows:
Step - 1 Recalculate Vallow using equation (2) with appropriate value of factor C, C, C, i, SA and x for the piping in question.
1 3
4 Step - 2 If measured value is greater than calculated value in Step - 1, use other appropriate engineering technique for possible acceptance.
5.0 TEST CONDITIONS Measurements shall be taken at the operating condition of piping.
6.0 MEASUREMENT LOCATIONS The measurement locations are based on observations and measurements made in the field.
Complete documentation of the measurement locations and measured velocity (frequency, acceleration as needed) shall be recorded.
7.0 INSTRUMENTATION Instrumentation for this test should be a portable, battery operated unit that provides direct readout of peak velocity and amplitude with frequency response of 2 to 200 Hz, with a built in printer to produce a hard copy chart for documentation.
8.0 PRECAUTION AND NOTES a.
All testing shall be performed in accordance with the applicable STP Start-up Procedures, b.
All measurements shall be made on the surface of the piping or on a firmly attached component such as a clamp or welded attachment.
4 wwwuravin
~
ATTACHMENT ST HL AE-1734
..f. AGE fa.0F 1 TEST GUIDELINE FOR VIBRATION TESTING OF DIESEL GENERATOR FUEL OIL SUPPLY LINES (Continued) 9.0 GOVERNING DOCUMENT AND DRAWINGS J
a.
ANSI /ASME Standard OM-3 (1982), " Requirements For the Preoperational and Initial Startup Testing of Nuclear Power Plant Piping Systems.
c.
ASME B & PV Code,Section III, Subsection NA, NC and ND,1974 Edition, including winter 1975.
5 3562M0109a
ATTACHMENT ST HL.AE /"k '/3/
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