PUC.FiUngCenterf%state.or.us Send completed Cover Sheet ... · Public Utility Commission of Oregon...
28
e-FIUNG REPORT COVER SHEET Send completed Cover Sheet and the Report In an email addressed to: PUC.FiUngCenterf%state.or.us REPORT NAME: CNG Gas Meter Statistical Sampling Program - 2015 Results COMPANY NAME: Cascade Natural Gas DOES REPORT CONTAIN CONFIDENTIAL INFORMATION? BJNo LJYes If yes, please submit only the cover letter electronically. Submit confidential information as directed m OAR 860-001-0070 or the terms of an applicable protective order. If known, please select designation: QRE (Electric) gRG(Gas) D RW (Water) DRO (Other) Report is required by: fjOAR Enter rule number: OAR 860-023-0015 QStatute Enter statute number DOrder Enter PUC Order No DOther Enter reason Is this report associated with a specific docket/case? [BJNo J| Yes If yes, enter docket number: Enter Docket number List applicable Key Words for this report to facilitate electronic search: Enter Key Words Testing Gas Meters, Meter Performance, Statistical Sampling Program DO NOT electronically file with the PUC Filing Center: • Annual Fee Statement form and payment remittance or • OUS or RSPF Surcharge form or surcharge remittance or • Any other Telecommunications Reporting or • Any daily safety or safety incident reports or • Accident reports required by ORS 654.715 Please file the above reports according to their individual instructions. PUCFM050 (Rev. 6/29/12)
Transcript of PUC.FiUngCenterf%state.or.us Send completed Cover Sheet ... · Public Utility Commission of Oregon...
e-FIUNG REPORT COVER SHEET
Send completed Cover Sheet and the Report In an email addressed to:
PUC.FiUngCenterf%state.or.us
REPORT NAME: CNG Gas Meter Statistical Sampling Program - 2015 Results
COMPANY NAME: Cascade Natural Gas
DOES REPORT CONTAIN CONFIDENTIAL INFORMATION? BJNo LJYes
If yes, please submit only the cover letter electronically. Submit confidential information as directed mOAR 860-001-0070 or the terms of an applicable protective order.
If known, please select designation: QRE (Electric) gRG(Gas) D RW (Water) DRO (Other)
Report is required by: fjOAR Enter rule number: OAR 860-023-0015
QStatute Enter statute number
DOrder Enter PUC Order No
DOther Enter reason
Is this report associated with a specific docket/case? [BJNo J| Yes
If yes, enter docket number: Enter Docket number
List applicable Key Words for this report to facilitate electronic search:
Enter Key Words Testing Gas Meters, Meter Performance, Statistical Sampling Program
DO NOT electronically file with the PUC Filing Center:• Annual Fee Statement form and payment remittance or
• OUS or RSPF Surcharge form or surcharge remittance or
• Any other Telecommunications Reporting or
• Any daily safety or safety incident reports or
• Accident reports required by ORS 654.715Please file the above reports according to their individual instructions.
PUCFM050 (Rev. 6/29/12)
CASCAOE.NATURAL GAS
CORPORATION
A Subsldlar/ of MDU flssaaves Gmup, inc.
® 8113 W.GRANDRIDGE BLVD., KENNEWICK, WASHINGTON 99336-7166TELEPHONE 509-734-4500 FACSIMILE 509-737-7166
www.c n gc .corn
In the Community to Serve"
January 27,2016
Ms. Lori G. Koho
Administrator - Safety, Reliability, and SecurityPublic Utility Commission of OregonP.O. Box 2148
Salem,OR 97308-2148
Ms. Koho:
Enclosed is Cascade's Annual Summary of Meter Performance for residential and small
commercial meters in service as of December 31,2015. These meters fall within the scope of the
company's Statistical Sampling Program (dated August 18, 1995).
All larger meters were tested according to their required periodic schedule. The total number of
meters in service in Oregon at the end of 2015 was 70,974
Sincerely,
Brett Hudson
Manager, Measurement
c: Mike Parvinen, Regulatory Affairs, CNGSteve Kessie, Operation Services, CNG
CASCADE NATURAL GAS
GAS METERSTATISTICAL SAMPLING
PROGRAM
2015 RESULTS
GAS METER STATISTICALSAMPLING PROGRAM
TABLE OF CONTENTS
GAS METER PERFORMANCE FOR THE PERIOD JANUARY 1, 2015 - DECEMBER 31, 2015
1. SCOPE
2. GENERAL
a. COMPLIANCEb. TESTING METHODOLOGYc. METER PERFORMANCE REQUIREMENTS
3. DEFINITIONS
4. RANDOM SAMPLING METER PERFORMANCE DATA
a. RANDOM SAMPLING - SUMMARYb. RANDOM SAMPLING METER FAMILIES PASS/FAIL AND STATISTICAL
RESULT SUMMARYc. METER FAMILIES BELOW ACCEPTABLE THRESHOLD LIMITSd. METER FAMILIES WITH INSUFFICIENTLY SIZED SAMPLEe. STATUS OF METER FAMILIES PREVIOUSLY SCHEDULE FOR
REMOVAL
5. APPENDIX
a. PROGRAM DOCUMENTATION
SCOPE
This report covers the methodology, test results, and proceedings of Cascade Natural Gas
Company gas meter statistical sampling program for residential and small commercial meters in
the states of Washington and Oregon for the period of January 1,2015 through December 31,
2015.
Sampling Summary
Meters in the program at the beginning of the plan year
Meters in the program at the end of the plan year
Total meters removed during the year
Meters qualifying for analysis (not uniquely defective)
Uniquely defective meters
Meters statistically required for analysis (>10 yrs in svc)
Meters provided through random selection (>10 yrs in svc)
277.983
281,919
5,949
4,694
1,255
3,697
997
GENERAL
COMPLIANCE
Gas meter testing requirements for Cascade Natural Gas are promulgated by the Washington
Administrative Code (WAC), Chapter 480-90, Section 348 "Frequency of Periodic Meter Tests"
and by the Oregon Administrative Rules (OAR), Chapter 860, Division 023 "Service Standards",
Section 0015 (Testing Gas and Electric Meters). Cascade's sampling program complies with Part
IV ('In Service Performance") of the 1992 version of ANSI standard B 109.1 andB109.2 as
specified in its Tariff Rule No. 7, part B filed in the state of Washington effective February 27,
2005 and Tariff Rule No. 6, part 1 filed in the state of Oregon effective June 15, 2007. Cascade's
plan also conforms to generally accepted statistical methods within the industry for predicting the
sampling distribution of the proportion of a population with a 90% degree of confidence.
TESTING METHODOLOGY
Cascade Natural Gas current random meter measurement performance program is in accordance
with its plan document entitied "Statistical Sample Program" dated August 18, 1995 (appendix).
Random sampling and testing is conducted for all domestic meters rated at 1000 CFH and
smaller.
METER PERFORMANCE REQUIREMENTS
Random Sampling—Meters in this program are randomly selected for inspection by attribute per
the plan document. Conforming meters are found to register accurately with a tolerance of
±2.0%. The intent of the testing standard is to verify the following two parameters:
Overall Performance — Verify with approximately 90% certainty, that the portion of non"
conforming meters does not exceed 20% of any installed meter population. For overall
performance, equal weight is given to both the upper and lower specification limit (i.e. check
and open reads are equally weighted and are averaged).
Fast Direction Performance - Verify with approximately 90% certainty that the portion of
non-confonning fast meters (i.e. meters that register in excess of 102% of accuracy) does not
exceed 10% of any installed meter population. For testing, equal weight is given to both the
upper and lower specification limit (i.e. check and open reads are equally weighted and are
averaged).
DEFINITIONS
Meter Population (Meter Family) - Grouping of meters as defined by each company, may
include reference to sub families as allowed by ANSI B109.1 and B109.2
Open Test - Meter proof test completed between 80 and 100 % of meter rated capacity or the
maximum rated capacity of the test equipment.
Check Test- Meter proof test completed at approximately 20% of the meter rated capacity.
Size / Class - Grouping of meters, based on capacity, that display similar performance
characteristics for all meters within the grouping. Size/Class may, at the company's discretion,
include multiple-sized meters within the same size class as long as the meter performance testing
of the individual meters is consistent with all meter in the size class.
Raudom Meters - Meters that are a selected at random to provide a statistically representative
sample of a meter family.
RANDOM SAMPLING METER PERFORMANCE DATA
DOMESTIC METERS 1000 CFH AND SMALLER
SUMMARY
Beginning of Report Year 2015, In-Sendce Meters on 1/1/15Total Number ofM:eters For Random Sampling 277,983
Total Number of Test Families<a) . 775
Number of Test Families > 10 yrs old() 98
Number of Test Families to be Voluntarily Removed for Admin. Purposes(c} 0
End of Report Year 2015 Meter Testing Quantities & ResultsNumber of Meters Tested 4,694
Number of Meters Passed, (+/-) 2% 4,400Number of Meters Failed, (+/-) 2% 294
Number of Meters, Uniquely Defective Test Result, (+/-) 10% 1,255
Meter Families With an Overall Fail Result 11
Meter Families With a Fast Fail Result 11
Meter Families Removed/Depleted During Report Year() 8
Transition to 2016 Test YearTotal Number of Meters For Random Sampling 281,919
Total Number of Test Families(a) 176
Number of Test Families >. 10 yrs old() 99
Number of Test Families to be Voluntarily Removed for Admin. Purposes(c) 11
a) Totai number of meter populations includes meter test families that are less than 10 years old
and are not yet subject to test requirements.
b) Number of Meter Test Populations > 10 years old (i.e. includes meters manufactured in the
year 2006 and earlier for the 2016 test year). Small populations less than 20 years old aretested but with the restriction that a meter will not be retested within five (5) years.
c) Number of meter families that were voluntarily removed for administrative reasons. Includes
families with less than 10 meters in population and meter populations that were observed to betrending towards failure
d) Total number of meter families depleted during the report year including those removed foradministrative purposes.
RANDOM SAMPLING METER PERFORMANCE DATA
DOMESTIC METERS 1000 CFH AND SMALLER
SUMMARY
METER FAMILY TEST RESULTS
FAMILY STATISTiCS
YEAR MAKE CLS SIZE
1982 ROCKW 1 28
1982 SPRAG 1 54
1983 SPRAG 1 332
1986 AMERI 1 611
1986 ROCKW 1 1614
1986 SPRAG 1 1027
1987 AMERi 1 2386
1987 ROCKW 1 2793
1987 SPRAG 1 1110
1988 AMERI 1 3288
1988 ROCKW 1 2382
1988 SPRAG 1 1826
1989 AMERl 1 5123
1989 ROCKW 1 4862
1989 SPRAG 1 3102
1990 AMERI 1 3788
1990 ROCKW 1 5509
Cascade Natural Gas Corp.
2015 METER SAMPLING PROGRAMYEAR-END STATUS REPORT
SAMPLE STATISTICS
MAX. NO. SAMP.SAMP RMVD CNT
2S 16 14
40 43 37
80 94 83
90 94 91
100 114 100
90 35 28
100 83 69
100 116 100
90 44 30
125 47 33
100 126 100
100 60 35
125 63 49
125 87 61
100 83 52
125 52 40
125 64 41
'ACCURACY' TEST RESULTS
OK. PCT. OK. MIN. CTLCNT OK LMT SAMP RGN
NOT FAST TEST RESULTS
NF. PCT. NF. M1N. CTL.CNT NF LMT SAMP RON
14
32
78
84
S3
28
67
94
30
33
90
33
48
59
49
40
41
100
86
93
92
92
100
97
94
100
100
90
94
97
96
94
100
100
13
6
6
6
6
12
8
6
12
11
6
11
9
8
9
10
10
8 i
37 i
24 1
29 I
30 I
11 I
15 I
22 I
11 I
11 I
43 I
22 I
15 I
17 I
22 E
11 i
11 I
14
37
83
84
97
28
67
94
30
33
93
35
48
60
52
40
41
100
100
100
92
96
100
97
94
100
100
92
100
97
98
100
100
100
9
5
5
5
5
9
6
5
9
9
5
8
7
6
7
8
8
13
17
23
90
65
24
49
100
24
24
100
24
49
38
24
24
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FURTHER ACTION ORSTATUS
ADD. D1SP. OF FAMILYREQ
0 ACCEPTABLE
0 ACCEPTABLE
0 ACCEPTABLE*
0 ACCEPTABLE
0 ACCEPTABLE
0 ACCEPTABLE
0 ACCEPTABLE
0 ACCEPTABLE
0 ACCEPTABLE
0 ACCEPTABLE
0 ACCEPTABLE
0 ACCEPTABLE
0 ACCEPTABLE
0 ACCEPTABLE
0 ACCEPTABLE
0 ACCEPTABLE
0 ACCEPTABLE
1990
1991
1991
1991
1992
1992
1992
1993
1993
1993
1993
1993
1994
1994
19S4
1994
1995
1995
1995
1995
1995
1996
1996
1996
SP RAG
AMERI
ROCKW
SPRAG
AMER1
ROCKW
SPRAG
AMER1
AM ER I
ROCKW
ROCKW
SP RAG
AMER!
AMERi
ROCKW
SPRAG
AMER1
AMERI
ROCKW
ROCKW
SP RAG
AMERI
AMERI
ROCKW
1
1
1
1
1
1
1
1
3
1
2
1
1
3
1
1
1
3
1
2
1
1
3
1
2538
4486
3222
2133
2978
7943
1691
3321
6
5674
26
5851
5443
18
4021
5773
3175
17
2506
32
10257
392
13
948
100
125
125
100
100
125
100
125
6
125
26
125
125
18
125
125
100
17
100
32
200
80
13
90
60
42
83
126
66
77
47
49
6
73
26
88
54
15
68
86
42
11
174
16
96
83
11
29
43
27
68
102
53
43
31
35
6
38
25
49
36
15
42
49
29
11
125
14
61
76
11
25
40
26
60
89
52
43
29
35
4
37
22
48
36
12
42
45
29
6
122
11
61
74
8
24
93
96
88
87
98
100
93
100
66
97
88
97
100
80
100
91
100
54
37
78
100
97
72
96
10
13
8
6
9
10
12
11
0
11
4
9
11
7
10
9
12
12
6
13
8
7
8
13
25
17
66
85
13
11
25
11
6
15
20
15
11
18
11
36
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4
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29
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122
11
61
74
8
25
100
100
98
100
98
100
100
100
66
100
92
100
100
80
100
97
100
54
97
78
100
97
72
100
7
9
6
5
7
8
9
8
0
8
3
7
8
5
8
7
9
9
4
10
6
5
6
10
24
24
38
24
38
24
24
24
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0
0
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0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
FAMILY DEPLETED
ACCEPTABLE
FAMILY DEPLETED
ACCEPTABLE
ACCEPTABLE
RECALL FAMILY
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
RECALL FAMILY
ACCEPTABLE*
RECALL FAMILY
ACCEPTABLE
ACCEPTABLE
RECALL FAMILY
ACCEPTABLE
1996
1996
1997
1&97
1997
1997
1997
1998
1998
1998
1998
1998
199S
1999
1999
1999
1999
2000
2000
2000
2000
2000
2000
2001
ROCKW
SPRAG
AMERi
AM ER I
ROCKW
ROCKW
SP RAG
AMER]
AMER1
ROCKW
ROCKW
SP RAG
AMERI
AMERI
ROCKW
ROCKW
SPRAG
AMERI
AMERI
ROCKW
ROCKW
SPRAG
SPRAG
AMERI
2
1
1
3
1
2
1
1
3
1
2
1
1
3
1
2
1
1
3
1
2
1
3
1
34
4382
93
47
458
73
6950
508
6
7536
208
760
7179
172
510
85
470
8299
151
918
146
63
1
6608
34
125
50
40
80
50
125
90
6
125
70
90
125
70
90
50
80
125
70
90
60
40
1
125
26
71
57
39
28
59
67
33
6
151
55
34
67
94
30
43
30
68
71
34
49
20
1
48
20
52
49
38
23
50
42
25
6
128
43
26
49
90
26
41
24
39
70
26
46
19
1
32
15
52
47
33
23
43
42
25
4
120
35
25
48
88
26
33
24
39
65
26
36
19
1
32
74
100
95
86
100
86
100
100
66
93
81
96
97
97
100
80
100
100
92
100
78
100
100
100
10
9
7
5
13
5
10
13
0
6
9
13
9
5
13
7
13
11
6
13
8
13
0
12
27
11
16
34
11
46
11
11
6
26
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17
15
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65
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19
1
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74
100
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86
100
88
100
100
66
93
83
100
97
97
100
82
100
100
92
100
78
100
100
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7
7
5
4
10
4
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7
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0
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0
0
0
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0
0
0
0
0
0
0
0
0
0
0
0
RECALL FAMILY
ACCEPTABLE
ACCEPTABLE
RECALL FAMILY
ACCEPTABLE
MONITORIN2016
ACCEPTABLE
ACCEPTABLE
FAMILY DEPLETED
ACCEPTABLE
RECALL FAMILY
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE*
ACCEPTABLE
RECALL FAMILY
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
RECALL FAMILY
ACCEPTABLE
FAMILY DEPLETED
ACCEPTABLE
2001
2001
2001
2001
2001
2002
2002
2002
2002
2002
2002
2003
2003
2003
2003
2003
2003
2004
2004
2004
2004
2004
2004
2004
AMER!
ROCKW
ROCKW
SPRAG
SPRAG
ACTAR
AMER[
AMER1
ROCKW
ROCKW
SP RAG
AMERi
AMER1
ROCKW
ROCKW
SPRAG
SPRAG
ACTAR
AMER1
AMER1
ROCKW
ROCKW
SP RAG
SP RAG
3
1
2
1
3
1
1
3
1
2
1
1
3
1
2
1
2
1
1
3
1
2
1
2
295
176
259
1160
28
883
7980
1 S3
764
451
443
9657
424
344
187
680
2
4
13725
335
374
343
96
5
80
70
70
90
28
90
125
70
90
80
80
125
80
80
70
90
2
4
200
80
80
80
50
5
83
24
44
32
26
29
190
72
33
27 .
34
171
86
78
26
34
2
4
275
29
80
77
24
5
82
21
42
26
24
25
165
70
26
27
26
148
S3
73
23
31
1
4
233
27
77
74
22
5
73
21
41
26
21
25
154
64
26
27
26
120
74
71
23
29
1
4
198
27
76
71
22
5
89
100
97
100
87
100
93
91
100
100
100
81
89
97
100
93
100
100
S4
100
98
95
100
100
6
14
9
13
5
13
5
6
13
12
13
5
6
7
13
12
0
0
4
12
7
7
12
0
45
10
14
11
21
11
26
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11
11
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5
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4
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9
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80
21
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MONITOR IN 2016
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
RECALL FAMILY
MONITOR IN 2016
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
FAMILY DEPLETED
FAMILY DEPLETED
RECALL FAMILY
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
FAMILY DEPLETED
10
2004
2005
2005
2005
2005
2005
2005
2005
2005
2006
2006
2006
2006
2006
2006
2006
2006
2007
2007
2007
2007
2007
2007
2007
SP RAG
ACTAR
AMER!
AMERi
ROCKW
ROCKW
SPRAG
SPRAG
SPRAG
ACTAR
AMERI
AMERI
ROCKW
ROCKW
SPRAG
SP RAG
SP RAG
ACTAR
AM ER I
AMER!
ROCKW
ROCKW
SP RAG
SP RAG
3
1
1
3
1
2
1
2
3
1
1
3
1
2
1
2
3
1
1
3
1
2
1
2
82
4
13762
289
257
515
246
25
52
1
13389
439
142
514
185
11
243
16
2640
215
312
370
309
26
50
4
200
80
70
90
70
25
40
1
200
so
60
90
70
11
70
16
100
70
80
80
80
26
36
4
117
29
23
28
28
19
34
0
73
0
2
12
4
0
9
0
13
2
2
3
4
1
35
3
77
28
23
24
28
16
30
0
38
0
1
8
1
0
5
0
7
2
0
1
0
1
33
3
74
28
23
24
28
16
29
0
37
0
1
8
1
0
5
0
7
2
0
1
0
1
94
100
96
100
100
100
100
100
96
NaN
97
NaN
100
100
100
NaN
100
NaN
100
100
NaN
100
NaN
100
8
0
7
12
13
13
12
10
8
N/A
11
N/A
«»
«»
«»N/A
«»
N/A
«»
«»N/A
«»
N/A
«»
13
4
17
10
10
11
10
8
13
1
15
40
10
11
10
6
10
8
11
10
40
11
40
8
[
[
[
I
i
i
i
1
1
N/A
1
IV
IV
IV
IV
IV
IV
IV
IV
IV
[V
IV
[V
!V
34
3
74
28
23
24
2S
16
29
0
37
0
1
8
1
0
5
0
7
2
0
1
0
1
97
100
96
100
100
100
100
100
96
NaN
97
NaN
100
100
100
NaN
100
NaN
100
100
NaN
100
NaN
100
6
0
6
s
10
10
9
8
6
N/A
8
N/A
«»
«»
«»N/A
«»
N/A
«»
«»N/A
«»N/A
«»
31
4
67
23
22
23
22
13
30
1
50
40
21
23
22
6
22
8
24
22
40
23
40
13
[
i
I
i
!
1
1
I
N/A
IV
IV
IV
IV
IV
IV
IV
IV
[V
[V
[V
[V
[V
iV
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
ACCEPTABLE
FAMILY DEPLETED
ACCEPTABLE**
ACCEPTABLE**
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
11
2007
2008
2008
2008
2008
2008
2008
2008
2008
2008
2009
2009
2009
2009
2009
2009
2009
2009
2010
2010
2010
2010
2010
2010
SPRAG
ACTAR
AMER!
AMERi
ROCKW
ROCKW
ROOTS
SPRAG
SPRAG
SP RAG
ACTAR
AMER!
AMER]
ROCKW
ROCKW
SPRAG
SP RAG
SP RAG
ACTAR
AMERI
AMERi
AMERi
ROCKW
ROCKW
3
1
1
3
1
2
3
1
2
3
1
1
3
1
2
1
2
3
1
1
2
3
1
2
51
3
12187
619
239
668
1
90
21
39
15
4895
381
503
561
482
17
39
3
3558
1
492
246
215
40
3
200
90
70
90
1
50
21
39
15
125
80
90
90
80
17
39
3
125
1
80
70
70
1
0
63
8
1
6
0
0
0
0
1
24
0
1
5
11
2
2
0
23
0
9
1
1
1
0
44
6
0
4
0
0
0
0
0
12
0
1
4
7
1
0
0
14
0
6
0
1
1
0
44
6
0
4
0
0
0
0
0
12
0
1
4
7
1
0
0
14
0
6
0
1
100
NaN
100
100
MaN
100
NaN
NaN
NaN
NaN
NaN
100
NaN
100
100
100
100
NaN
NaN
100
NaN
100
NaN
100
«»N/A
10
«»N/A
«»N/A
N/A
N/A
N/A
N/A
19
N/A
«»
«»
«»
«»
N/A
N/A
18
N/A
«»N/A
«»
9
2
11
11
35
11
1
25
11
20
8
11
40
11
11
11
7
20
2
11
1
11
35
10
iV
N/A
]
IV
IV
IV
N/A
IV
[V
IV
IV
I
IV
IV
IV
[V
[V
IV
N/A
I
N/A
IV
IV
IV
1
0
44
6
0
4
0
0
0
0
0
12
0
1
4
7
1
0
0
14
0
6
0
1
100
NaN
100
100
NaN
100
NaN
NaN
NaN
NaN
NaN
100
NaN
100
100
100
100
NaN
NaN
100
NaN
100
NaN
100
«»N/A
7
«»N/A
«»N/A
N/A
N/A
N/A
N/A
«»N/A
«»
«»
«»
«»N/A
N/A
«»N/A
«»N/A
«»
17
2
24
23
35
24
1
25
11
20
8
24
40
23
23
23
10
20
2
24
1
23
35
22
IV
N/A
I
[V
!V
iV
N/A
IV
IV
IV
IV
IV
[V
[V
!V
iV
IV
IV
N/A
IV
N/A
IV
iV
IV
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
\1
2010
2010
2010
2011
2011
2011
2011
2011
2011
2011
2011
2012
2012
2012
2012
2012
2012
2012
2012
2012
2013
2013
2013
2013
SP RAG
SP RAG
SP RAG
ACTAR
AMER1
AMERi
ROCKW
ROCKW
SP RAG
SP RAG
SP RAG
ACTAR
AMERE
AMERi
ROCKW
ROCKW
ROOTS
SP RAG
SP RAG
SPRAG
ACTAR
AMERi
AMER1
AMERi
1
2
3
1
1
3
1
2
1
2
3
1
1
3
1
2
3
1
2
3
1
1
2
3
333
13
154
6
4740
358
231
695
246
24
27
23
3804
221
230
532
1
230
22
41
23
5501
152
443
80
13
70
6
125
80
70
90
70
24
27
23
125
70
70
90
1
70
22
40
23
125
70
80
3
0
5
0
24
3
1
15
1
0
1
1
19
2
5
5
0
3
1
2
1
33
1
3
1
0
5
0
16
3
0
10
1
0
1
1
12
1
3
4
0
3
1
2
1
21
1
2
1
0
5
0
16
3
0
10
1
0
1
1
12
1
3
4
0
3
1
2
1
21
1
2
100
NaN
100
NaN
100
100
NaN
100
100
NaN
100
100
100
100
100
100
NaN
100
100
100
100
100
100
100
«»
N/A
«»N/A
16
«»
N/A
«»
«»
N/A
«»
«»19
«»
«»
«»
N/A
«»
«»
«»
«»
14
«»
«»
11
7
10
3
11
11
35
11
10
12
8
s
11
10
10
11
1
10
7
9
8
11
10
11
IV
IV
IV
N/A
I
[V
IV
IV
[V
IV
IV
IV
I
IV
IV
IV
N/A
IV
IV
IV
IV
I
IV
IV
1
0
5
0
16
3
0
10
1
0
1
1
12
1
3
4
0
3
1
2
1
21
1
2
100
NaN
100
NaN
100
100
NaN
100
100
NaN
100
100
100
100
100
100
NaN
100
100
100
100
100
100
100
«»
N/A
«»
N/A
«»
«»
N/A
«»
«»
N/A
«»
«»
«»
«»
«»
«»
N/A
«»
«»
«»
«»
«»
«»
«»
23
7
21
3
24
23
35
24
22
12
13
12
24
22
22
23
1
22
12
16
12
24
21
23
IV
IV
IV
N/A
IV
[V
IV
IV
IV
IV
IV
IV
IV
IV
IV
IV
N/A
IV
IV
IV
IV
IV
IV
IV
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
13
2013
2013
2013
2013
2013
2014
2014
2014
2014
2014
2014
2014
2014
2014
ROCKW
ROCKW
SPRAG
SPRAG
SPRAG
ACTAR
AMERI
AMERI
AMERI
ROCKW
ROCKW
ROOTS
SP RAG
SPRAG
GRAND TOTALS
1
2
1
2
3
1
1
2
3
1
2
3
1
2
250
193
206
19
79
24
368
55
90
2188
185
6
129
5
277978
70
70
70
19
50
24
80
40
50
100
70
6
60
5
1
2
0
0
4
0
7
3
8
17
5
0
4
0
5949
0
0
0
0
3
0
3
2
6
10
2
0
2
0
4694
0
0
0
0
3
0
3
2
6
10
2
0
2
0
4400
NaN
NaN
NaN
NaN
100
NaN
100
100
100
100
100
NaN
100
NaN
N/A
N/A
N/A
N/A
«»N/A
«»
«»
«»
«»
«»N/A
«»N/A
35
35
35
10
10
12
11
9
10
11
10
3
10
3
IV
[V
[V
IV
[V
iV
IV
!V
IV
IV
IV
N/A
IV
N/A
0
0
0
0
3
0
3
2
6
10
2
0
2
0
4466
NaN
NaN
NaN
NaN
100
NaN
100
100
100
100
100
NaN
100
NaN
N/A
N/A
N/A
N/A
<:<»
N/A
«»
«»
«»
«»
«»N/A
«»N/A
35
35
35
10
19
12
23
17
19
24
22
3
21
3
IV
IV
IV
iV
IV
IV
IV
IV
IV
IV
IV
N/A
IV
N/A
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
ACCEPTABLE
*Test results were combined from samples taken in years 2013, 2014 and 2015 to obtain a sufficiently sized sample.
**A sufficiently sized sample was obtained as of August 1, 2015. Additional test results were not required and, therefore, were excluded from sample.
14
RANDOM SAMPLING METER PERFORMANCE DATA
DOMESTIC METERS 1000 CFH AND SMALLER
STATUS REPORT NOTES
Notes to Year-End Status Report:
1) TEST FAMILY : Naming designatioti of each family.
a) YEAR/MAKE/(SIZE) CLASS: Components of the family designation or name.b) FAMILY SIZE: Count of number of meters in test family at the start of the test year being
reported.
2) SAMPLE STATISTICS: Statistics pettaining to tepresentative sample taken fi-om each
family.
a) MAX.SAMP: Maximum, number of meteis that would be required in a sample m order to
make a valid determmation of fche family's future disposition.
b) NO.RMYD; Number of meters in each family removed during the course of die plan year.c) SAMP.CNT: Total number of meters qualified for use m each sample. Meters determined
to be uniquely defective are excluded from the sample count and any sample determination.
3) OVERALL "ACCURACY" TEST RESULTS: Compilation of test results to determme the
ptopottion of the sample meetmg the "accutacy" test (i.e. 98.0 to 102.0 percent accutate).
a) OK.CNT: Number of meters in the sample found 98.0 to 102.0 percent accurate.
b) PCT.OK: Percent or proportion of die sample found "accurate".
c) OK.LMT: The control limits above or below die 80% proportion threshold,d) MIN.SAMP: The minim.um. a.mnbei: of meters lequircd in each sample to provide a
statistically valid sample.e) CTL.RGN: Control region in which die sample is dctermmed to be on the "meters
accurate control chart provided in the program document.
4) "NOT FAST" TEST RESULTS: Compilation of test results to determine the proportion
of the sample meetiag the "not fast" test (i.e. not more than 102.0 petcent accutate).
a) NP.CNT: Number of meters in die sample found not exceeding 102.0 percent accurate.
b) PCT..NF: Percent or proportion of sample found "not fast".
c) NF.LMT: The control limits above and below the 90°/o proportion threshold.
d) MIN.SAMP: The minimum number of meters required in each sample to provide astatistically valid sample.
e) CTL.RGN: Conirol region in wl-iich the sample is determined to be on the "meters not
fast" control chart provided in die program document.
5) FURTHER ACTION OR STATUS: Further acrion(s) that may be necessary to ensme thesample is of sufficient size and the family remains in compliance with program guidelines.
a) ADD.REQ: Additional number of meters required to meet or exceed minimum, sample si^e.
b) D XSP. OF.FAMILY: Future disposition 01 status of each family as determined by the
decision tree provided in the program document.
15
RANDOM SAMPLING METER PERFORMANCE DATA
DOMESTIC METERS 1000 CFH AND SMALLER
METER FAMILIES BELOW ACCEPTABLE THRESHOLD LIMITS
Eleven meter families in service ten or more years were found below the
acceptable threshold limits (i. e. fall in region III).
Meter Family
1994 AMERI31995 AMEm31995 ROCKW21996 AMERI31996 ROCKW21997 AMERI31998 ROCKW21999 ROCKW22000 ROCKW22003 AMERIl2004 AMERI1
Disposition Status
Recall FamilyRecall FamilyRecall FamilyRecall FamilyRecall FamilyRecall FamilyRecall FamilyRecall FamilyRecall FamilyRecall FamilyRecall Family
Year Disposition
Initiated20162016201620162016201620162016201620162016
Planned Yenr to
Complete Disposition20162016201620162016201620162016201620172017
16
RANDOM SAMPLING METER PERFORMANCE DATA
DOMESTIC METERS 1000 CFH AND SMALLER
METER FAMILIES WITH INSUFFICIENTLY SIZED SAMPLE
Meter Family
N/A
Family Size Min Sample SizeRequired
Meters Qualifyingfor Sample in 2015
17
RANDOM SAMPLING METER PERFORMANCE DATA
DOMESTIC METERS 1000 CFH AND SMALLER
STATUS OF METER FAMILIES PREVIOUSLY SCHEDULED FOR REMOVAL
No meters \v ere previously scheduled for removal in 2015
Meter Family
N/A
Disposition Status Year DispositionInitiated
Year DispositionCompleted
18
APPENDIX
Cascade Natural Gas CorporationStatistical Sample Program
August 18, 1995(Revised November 3, 2014)
Program Description
Using knowledge of the operating histories of similar meters, the company may elect to keep
particular meters in service for intervals beyond those specified in applicable state regulations,provided the meter performance meets the criteria of the company's Statistical Sample Program.
Eligible meters are diaphragm type meters with a rated capacity of up to 3,000 ft /hr.
The maximum permissible error in the registration of meters placed in service is ±2.0% at both theopen and check rates. For the purposes of the Statistical Sample Program, the definition of a meter
registering with an error of -2.0% is one that registers 98.0% of accuracy and a meter registering
with a +2.0% error is one that registers 102.0% of accuracy. A meter, therefore, must register
between 98.0% and 102.0% of accuracy at each test rate, before being placed in service.
Each meter in the Statistical Sample Program will be assigned to a meter group or "family"
according to its manufacturer, meter size, meter class, and test year. At the option of the company,meters in any family may be further subdivided according to meter type, size, location, age, or otherfactors that may be disclosed by test data to have an effect on the performance of the meters.
Subsequently, meter families may be modified or combined asjustlfied by the performance records.
The program year shall begin on January 1 and end on December 31 of the same year.
Sample Selection and Evaluation
The performance evaluation of each meter family will be based on an evaluation of test results from
random sampling of the family. Sample data collected during a given program year will beanalyzed, and a decision regarding meter family disposition will be made in the first quarter of the
following calendar year. The performance and status, including disposition, of each meter familywill be reported to the regulatory commissions as part of the annual meter report.
The random sample for each family will include meters which are removed from service on a
routine basis, e.g. meters not in use, too large, too small, damaged index cover, service relocation or
replacement, etc. If more meters are required for testing than have been removed from service forroutine purposes, a random sample of meters within that family will be removed from service and
included in the sample.
All non-contaminated, testable meters will be tested in accordance with ANSI B109.1, and B109.2,
using ail average of the open and check in-test results to evaluate each meters performance. Forpurposes of evaluatmg the performance of each meter family, the analysis of the test results will
exclude data on meters which are damaged, meters which do not register, meters which do not pass
gas, and meters which measure either less than 90.0 percent accurate or more than 110.0 percent
accurate.
19
APPENDIX
A meter family will be considered to be acceptable if the sample of the family indicates;a) a minimum proportion of .80 of the family measures between 98.0 percent and 102.0 percent
accurate ("accuracy" requirement); and
b) a minimum proportion of .90 of the family measures no more than 102.0 percent accurate ("not
fast" requirement). .
To determine the significance of the proportions measured from sampling, the test results will be
compared with threshold proportions and control limits on a control chart. The control limits will be
defined as follows:
P.9o=p.± 1.645 * [pt(l-pt)/n]-5 * [(N-n)/(N-l)]-5
where:
P.9o is the upper and lower proportion corresponding with an interval which willhave a 90 percent probability of including the proportion from a random sample of
size n (drawn without replacement) from a population of size N and a proportion
equal to pi. P( is the threshold proportion, equal to the minimum acceptable
proportion of the meter family and is:= .80 for meters registering between 98.0% and 102% accurate, or
.90 for meters registering no more than 102% accurate.
n is the sample size.
N is the meter family size prior to sampling.
1.645 is the factor necessary to provide the interval estimate associated with thethreshold proportion, such that, nine times out of ten, the sample proportion will be
included within that interval.
Each proportion measured from sampling will specify a particular region (I, II, III, or IV) on thecontrol chart within which the sample data would plot. The regions (I, IIa, lib, III, and IV) are
outlined by the control limits and the threshold proportions, and will be as defined by figures 1 and2. The vertical line between the regions II(a and b) and IV on the control chart will be established
according to the following schedule:
Division line between Regions II(a and b)and IV on the Control Chart
40 (or family size if less)5060708090100125200
20
166101151281501120132011000:
Remaining
Family Sizeto
toto
to
to
toto
to
I and over
65100150280500
12003200
10000
APPENDIX
The performance of each family will be characterized by the regions on the control chart according
to the following table:
Meter Family Meter Family< lOyrsold ^ lOyrsold
Region I Satisfactory SatisfactoryRegion II a Satisfactory SatisfactoryRegion II b Satisfactory SatisfactoryRegion III At/below Limits At/below LimitsRegion IV Satisfactory Insufficient Sample
Meter Family Disposition
Meter family disposition will be determined according to the following steps:
1. The proportion of the meters in the sample that measure between 98.0 percent and 102.0percent accurate will be calculated, and the respective region on the "Accuracy" control
chart detemiined.
2. The proportion of the meters in the sample which measure not more than 102.0 percentaccurate will be calculated, and the respective region on the "Not Fast" control chart
determined.
3. If the region Is determined to be "IV" on either the "Accuracy" control chart or "Not Fast"control chart, additional random samples shall be taken so that the combined sample is
sufficient to move the sample into any region other than "IV". However, if meters tested in
the fourth quarter of the plan year cause the family to fall into region "IV" unexpectedly,leaving insufficient time to obtain the additional number of meters required to complete the
sample, the company may elect to increase the sample size of the family by combining the
current sample with the samples from the previous two years so that a sufficiently sizedsample is obtained to cause the family to fail in a region other than "IV". The disposition of
this "multiple year family" shall then be subject to the same rules of the plan as any otherfamily In the plan. "Multiple year- families" that fall in region I shall be subject to
aggressive sampling in the following plan year so that a follow up determination is madewithin the first six months without any need to combine multiple years.
4. The results from steps 1 and 2 (provided neither are region "IV") will be applied to the
conditions outlined in the decision tree, shown in figures 3a and 3b.
5. Meters in families falling in regions I and IIa are determined to be satisfactory and will be
allowed to remain in service, subject to sample testing and review in succeeding years.
6. Meters in families falling in region lib are subject to change-out at the company's
discretion. The decision as to their removal will be based on economic and operating
factors. If the meters remain in service, they will be subject to sample testing and review in
21
APPENDIX
succeeding years.
7. Meters in families falling in region III shall be removed from service by December 31 ofthe second year following the determination (i.e. two years following the program year
when the samples were taken.) However, if in any given year the total number of meters to
be removed from service exceeds four percent of the number of meters in the StatisticalSample Program, the company may, at its option and with Commission approval, extend
the change-out schedule so that each meter family is changed within a maximum of four
years from determination that change-out is required (i.e. four years following the program
year when the samples were taken).
This space is left blank intentionally
22
APPENDIX
Decision Tree for Meter Families in Meter
Sample Program
Test meters removed for routinepurposes only. Ofllermine respectiveregions on Accurocy and Not tost
control charts
famify is Acccpiable. However, in the foltoring year;
Test meters. Aggressrvely somple if necessofy toachieve minifntjm sample ssie. Oetcrmine respectiveregions on Accuracy ond Not Fost cotitrol chads.
No
Continued on following page
Family is Acceptob!c
Did lost yew'sAccuracy" fe9ion
lib or III?Change out fomiiy
Figzire 3. a,
23
APPENDIX
Continued from previous page1
No
CtKsnge out fomBy
Change out fomiiy
'<fif(erence belwwn kufycor's 'Accurocy" proportion
ond this yeor's ie»than 35t?
Did!osl year's "Not Fast
region =llbOf ill?
Change out family
Family is Acceptable
Company lo decide onchongeout bosed on
economics endoperoting (actors.
Figure 3.b.
24
APPENDIX
Figure 1.1.00
E? 0.90u^0t:0a.0a.
0a.
£0
LO
0.80
0.70
0.60
Figure 2.1.00
g 0.95
<ua.E 0.800(/)
0.75
Meter Performance Control Charts
For Meters Accurate
I IV
-.8+1
-.8-1.
T
.645*[.8*(1-
Ha
lib
645*[.8*(1-.
.8)/n]
8)/n] •
T
•5*[(N-n)/(N-1)]'5
I
5*[(N-n)/(N-1)]-5
50 100 150 200
Sample Size (n)
For Meters Not Fast
250
-.9-J-1.645*[.9*(l-.9)/n]-5*[(N-n)/(N-t)]
I
-.9-1.645*[.9*(1-.9)/n]-3*[(N-n)/(N-l)]
50 100 150 200
Sample Size (n)
250
500
300
example where famiiy size (N) = 3000
25
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