API STD 6A
SPECIFICATION FOR WELLHEAD EQUIPMENT (Production Valves, Flanges, Blowout Preventers, and Wellhead Fittings)
|Publication Date:||1 March 1971|
Coverage. This specification covers items of equipment utilized for pressure control systems required during the drilling and production life of a well. Specifically covered are the groups of equipment usually referred to as ring-joint flange., ring joint gaskets, drilling-through and flow line valves, multiple completion valves, flanged drilling through equipment, screwed wellhead equipment flanged wellhead equipment, Christmas tree equipment, flow control chokes, water sampling devices, segmented flanges, and underwater wellhead equipment, which include the following types:
Sect. 2 Ring-Joint Flanges
Type 6B: 2,- 8,- and 6,000 psi
Type 6BX: 6,-10,- and 16,060 psi
Blind (10,- and 115,000 psi only)
Welding Neck (10,- and 16,000 pal only)
Sect. 3 Ring-Joint Gaskets
Type R, RX, and BX
Sect. 4 valves, Drilling-through and Flow line
Flanged and Screwed
Sect. 5 valves, Multiple Completion
Flanged, low-line, full-bore gate and plug
Sect. 6 Drilling-through Control Equipment
Adapters or Spools, Drilling-Through
Sect.. 7 screwed Wellhead Equipment
Screwed Casing Head.
Screwed Tubing Heads
Sect. 8 Flanged Wellhead Equipment
Sect. 9 Christ mas tree Equipment
15,000 pal Test Connections
Sect. 10 Flow control Chokes
Sect. 11 Automatic Shutoff valves.
Sect. 12 Water Sampling Device.
Sect. 13 Segmented Flanges
Sect. 14 Underwater Wellhead Equipment
Many of the foregoing items of equipment have specific complementary internal dimensions to pennant (1) drilling-through, (2) running and landing a smaller string of pipe as diagrammatically shown in Fig. 1.1, (3) running tools, instruments, etc., into the well bore via the tubing passage.
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