Wellhead
Wellhead
Wellhead
1-BOP 2-Casing head housing (+Casing hanger) 3-Pack-off (where increasing pressure)
4-Casing head spool (+bushing & Casing hanger) 5-Tubing head spool (+bushing & tubing hanger)
Gate valve Choke valve Check valve Sweep bend (V type) Stuffing box-Tree cap
API 6A
Total description
Pressure Class: 2000, 3000, 5000, 10000, 15000, 20000 (30000 in Cameron catalog)
If internal thread there is change in pressure class: Line pipe: 3000, 5000, 10000
Tubing: 5000
Size: 1-13/16, 2-1/16, 2-9/16, 3-1/16, 3-1/8, 4-1/16, 5-1/8, 7-1/16, 9, 11, 13-5/8, 16-3/4, 21-1/4
(Cameron valve size: 1-13/16, 2-1/16, 2-9/16, 3-1/16, 3-1/8, 4-1/8, 4-1/16, 5-1/8, 6-1/8, 6-3/8, 7-1/16, 9)
PSL (Product specification level): for general service: 1 & for sour service: 2, 3, 3G (gas testing), 4
Requirements and tests Material designation: 36K, 45K, 60K, 75K (tensile, elongation, yield,
area reduction)
Tensile test
Impact test
Processing (casting, hot working, melting)
Hardness
**There are quality requirement and equipment specification for body & bonnet material, welding
parts, gasket rings, stem, valve bore sealing mechanisms, choke trim, studs and nuts, all kind of
valves, Christmas tree, hangers, bullplug and valve removal pressure
Design specifications
Flange: 6B, 6BX, dual segmented (there are tables for flange dimension)
Valves dimension: Face to Face & Bore is required (have been seen when the pressure goes up there
is some smaller size capable)
Casing and tubing head (size from 7-1/16 to 21-1/4): full opening, reduced opening, increased
opening (with wear bushing & packing) (bore table is required and flange like before)
Casing and tubing hanger (size from 7-1/16 to 21-1/4 and pressure from 2000 to 15000): Group 1 to 5
(different from sealing), 2 kinds of hanger are required: 1-slip hanger 2-mandrel hanger (out side
diameter and working pressure rate are in tables)
Tubing head adaptor: this part can be merged with Master valve
Group1: tubing head adaptor seal the wellbore from annulus (performance
requirements)
Group2: tubing head adaptor seal the wellbore from annulus and suspend the tubing
Choke: Positive (fixed orifice without stem) end connections: equal rated working
Trim types: needle and seat - plug and cage external sleeve multistage positive bean
Fluid sampling devise: shall be design for material classes CC, FF, HH
Cross over connectors: (dimensions are like casing head & tubing head)
Adaptor (different end size) & spacer spool (same end size)
Actuator: hydraulic, pneumatic, electric power which are 2 type single acting & double acting
Annex:
A: purchasing guideline: PSL & sour gas definitions and different + Wellhead parts data sheets
C: Method of calculating stud bolt torque (there are tables by the flange type)
D: Recommended flange bolt torque (there are tables which gives torque needed)
F: Performance verification (there are complete explanation of tests and acceptable criteria)
I: Performance verification for SSV & USV acc to API 14D (there is test explanation and its test
section details)
K: top connectors for Christmas tree (body, blanking plug, bonnet nut, seal, backup ring & O-ring
dimensions)
M: list of figures
N: API monogram and test agency licensing (API Q1: Quality Management System Requirements)
O: ZZ material and N temperature class (and also some editing and replacements needed)
P: heat treatment of parts and QTC(qualification test coupon) and thermocouple locations
Cameron Gate Valves:
* in Cameron catalogue FLS-S type is like FLS except having 2 slab gates in the same valve cavity allows the flow line seal test to be performed simultaneously in both flow direction.
* in Cameron catalogue M Row-R-seal & M-HT have expanding gate design with material class to FF and PSL 1, 2 and eliminate turbulence and pressure drop