Maximum Capacity of Corrugated Stainless
Steel Tubing (CSST) in Thousands of Btu per Hour of Undiluted Liquefied Petroleum Gasses
At a pressure of 11 inch Water Column and a Pressure Drop of 0.5 inch Water Column
(Based on a 1.52 Specific Gravity Gas)
Tubing
Length Ft.
EHD**
Flow
Designation
13
EHD**
Flow
Designation
14
EHD**
Flow
Designation
18
EHD**
Flow
Designation
19
EHD**
Flow
Designation
23
EHD**
Flow
Designation
25
EHD**
Flow
Designation
30
EHD**
Flow
Designation
31
5
72
99
181
211
55
426
744
863
10
50
69
129
150
254
303
521
605
15
39
55
104
121
208
248
422
490
20
34
49
91
106
183
216
365
425
25
30
42
82
94
164
192
325
379
30
28
39
74
87
151
177
297
344
40
23
33
64
74
31
153
256
297
50
20
30
58
66
118
137
227
265
60
19
26
53
60
107
126
207
241
70
17
25
49
57
99
117
191
222
80
15
23
45
52
94
109
178
208
90
15
22
44
50
90
102
169
197
100
14
20
41
47
85
98
159
186
150
11
15
31
36
66
75
123
143
200
9
14
28
33
60
69
112
129
250
8
12
25
30
53
61
99
117
300
8
11
23
26
50
57
90
107
Notes: Table includes looses for
four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and
/or fittings shall be increased by an equivalent length of turning to the following
equation: L = 1.3N where L is additional length (ft) of tubing and N is the number of
additional fittings and/or bends.
**- Equivalent Hydraulic Diameter- A measure of the
relative hydraulic efficiency between different tubing sizes. The greater the value of
EHD, the greater the gas capacity of the tubing. For additional CSST flow data refer to
NFPA Pamphlet 54. Reference NFPA Pamphlet 54, table 20-29.