There is a lot of misunderstanding surrounding the term double block-and-bleed (DBB) as used to describe valve functionality. It seems almost every valve buyer and manufacturer has a different idea of what the term means for valve selection, which can result in the wrong specifications or valve type. Some of this confusion in the oil and gas industry stems from the fact that there are two credible sources that define the term differently. “Another point of confusion comes when many people use the term double block-and-bleed when they really want a valve with capabilities of double isolation-and-bleed (DIB),” Ron Manson, Director of Applications Engineering, explains. These differences in definitions and terms are important when it comes to which valve capability to use in what type of system. .
“Whenever a customer says they want DBB, it is mainly based on the application and their past experience with what they consider DBB valves to be,” says Mike Hintz, District Manager for Engineered & Process Valves. “Based on customers’ preferred valve type and application, we can then offer ball, gate, or expanding plug valve options with DBB capabilities.”
There are two entities in the United States that define DBB – the American Petroleum Institute (API) and the Occupational Safety and Health Administration (OSHA). API is a trade organization that acts as an advocate as well as researcher for America’s oil and natural gas industry, outlining many industry guidelines for safe operation. OSHA is the branch of the United States Department of Labor that is charged with enforcing health and safety legislations, outlining legislation that protects both people and our environment.
SIZE
|
A
|
B
|
CSQ
|
WEIGHT (kg)
|
1/4"
|
93
|
55
|
25
|
0.36
|
3/8"
|
93
|
55
|
25
|
0.37
|
1/2"
|
95
|
66
|
28
|
0.46
|
3/4"
|
109
|
70
|
38
|
0.8
|
1"
|
117
|
80
|
45
|
1.3
|
Duplex Steel: Grade: ASTM / ASME A/SA 182 UNS F44, F45, F51, F53, F55, F60, F61 Hastalloy : Grade: Hastalloy B2, Hastalloy B3, Hastalloy C22, Hastalloy C276, Hastalloy X Inconel : Grade: Inconel 600, Inconel 601, Inconel 625, Inconel 718 Incoloy : Grade: Incoloy 800, Inconel 800H, 800HT Monel : Grade: Monel 400, Monel K500, Monel R-405 Nickel : Grade: Nickel 200, Nickel 201 Stainless Steel : Grade: ASME / ASTM SA / A403 SA / A 774 WP-S, WP-W, WP-WX, 304, 304L, 316, 316L, 304/304L, 304H, 316H, 316/316L, 321, 330, 347, 309/S, 310/S, 317/L, 333, 410/S, DIN 1.4301, DIN1.4306, DIN 1.4401, DIN 1.4404 Titanium : Grade: Gr1, Gr2, Gr3, Gr5, Gr7, Gr11 |
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