CAMTOP API 6A Casing Head Assembly | Wellhead Lower Completion | 3,000-15,000 psi

Description

Overview

The CAMTOP API 6A Casing Head Assembly is the lower component of surface wellhead equipment,
designed and manufactured in strict accordance with API 6A / ISO 10423 specifications. It serves as the
structural and pressure-containing interface that anchors the surface casing string and provides the
suspension point and primary pressure seal for all casing strings running from the reservoir to the
surface pressure control equipment. The assembly consists of a casing head housing, casing hanger
(slip-type or mandrel-type), elastomeric pack-off, secondary seal, and lock-screw arrangement — all
fully compliant with API material class, temperature range, and PSL level requirements.

CAMTOP casing head assemblies are rated for working pressures from 3,000 psi through 15,000 psi
and are available with multiple outlet configurations (studded / flanged / line-pipe) to suit varied
well-program requirements. The system is compatible with conventional Christmas tree equipment and can be
mixed and matched with standard API 6A components from other qualified manufacturers. It is suitable
for vertical wells, horizontal wells, and advanced completion types including FRAC, thru-tubing,
sidetrack, and multi-lateral operations. Sour-service variants are available per NACE MR0175.

Product Image

Key Features

<li style="margin-bottom:8px;"Fully designed and manufactured in accordance with API 6A / ISO 10423 standard,
including all pressure-containing and load-bearing components.

<li style="margin-bottom:8px;"Available working pressure ratings: 3,000 psi, 5,000 psi, 10,000 psi, 15,000 psi — covers all standard production and intermediate casing strings.

<li style="margin-bottom:8px;"Complete API Material Class coverage: AA, BB, CC, DD, EE, FF, HH — every sour-service and standard-service requirement is met.

<li style="margin-bottom:8px;"Full PSL specification-level compliance: PSL-1, PSL-2, PSL-3, PSL-3G including the highest integrity verification level.

<li style="margin-bottom:8px;"Performance Level PR-1 and PR-2 options for gas, oil, and mud service.

<li style="margin-bottom:8px;"Elastomeric pack-off automatically energised by casing weight — eliminates the need for manual preload adjustments and ensures positive seal under thermal cycling.

<li style="margin-bottom:8px;"Slip-type or mandrel-type casing hanger options to match customer casing-program requirements.

<li style="margin-bottom:8px;"Industry-standard “FS” type secondary seal in casing head spool for reliable back-up sealing.

• VR thread profile on outlet connections for premium sealing and repeated make-up cycles.
• Three outlet types available: Line-pipe, Studded, and Extended-flanged — adaptable to any Christmas tree or spool configuration.

<li style="margin-bottom:8px;"Multiple secondary seal penetration ports for annulus monitoring, pressure testing, and gas-lift lines.

• Qualified to NACE MR0175 for sour-service H₂S-containing well environments.
• Tested per API 6A hydrostatic, gas-leak, and full-bore drift procedures before shipment.
• Manufactured under ISO 9001 / API Q1 quality management system with full material traceability.

Technical Specifications

Available Casing Head Configurations

The CAMTOP casing head assembly is supplied in the following standard bore / pressure / outlet combinations.
Custom configurations — including larger through-bores, higher pressure ratings, or special material
classes — are available on request.

Component Architecture & Cross-Section

The CAMTOP casing head assembly integrates the following major components as shown in the cross-section
reference image above:

• Casing Head Housing — forged low-alloy steel body with bottom flange connection
  and top studded/flanged outlet for the next spool up (casing spool or tubing head adapter).
• Casing Hanger — slip-type or mandrel-type, designed per casing weight and
  landing depth; the slip segments engage the casing string to transfer axial and bending loads to the
  housing.
• Pack-off Elastomer — NBR/FKM/HNBR packoff ring set automatically energised by
  casing weight, sealing the annulus between casing OD and bore ID.
• Secondary Seal (FS-Type) — provides back-up sealing if the primary elastomer
  is compromised; allows annulus-pressure monitoring.
• Lock Screws — retain the casing hanger in the housing against any
  upward/downward movement during well-test or stimulation operations.
• Test / Bleed / Gauge Ports — additional penetration ports on the side of
  the housing for pressure-testing, annulus monitoring, and gas-lift line connections (typically 1/2″ NPT
  or 1/4″ NPT).
• Bolting — studded outlet connection secured via ASTM A193 B7/B16/L7 stud
  bolts with ASTM A194 2H/7 nuts.

Function & Operating Principle

The casing head assembly performs three critical functions in the wellhead:

1. Structural suspension — transfers the entire weight of
   the casing string to the surface wellhead structure, distributing axial and bending loads through the
   forged housing to the cellar deck or conductor casing.
2. Pressure containment — provides a leak-tight seal against
   full internal working pressure (up to 15,000 psi) across all pressure classes per API 6A
   hydrostatic-test criteria.
3. Annulus monitoring & access — secondary seal penetrations
   allow real-time annulus-pressure monitoring, gas-lift line connections, and chemical injection to
   control corrosion, scale, or hydrate formation in the casing annulus.

Application Scenarios

• Vertical wells — primary lower-wellhead installation for conductor, surface,
  intermediate, and production casing string landings.
• Horizontal wells — supports directional and horizontal casing strings under
  high lateral loading.
• FRAC completions — qualified for high-rate, high-pressure hydraulic fracturing
  operations with sour-service material upgrade.
• Thru-tubing completions — supports thru-tubing intervention and
  re-completion workover operations.
• Sidetrack and Multi-lateral wells — provides suspension point and pressure seal
  for the original casing string while the lateral bores are drilled.
• Sour-service fields — NACE MR0175 qualified material combinations (F22/HH-grade +
  Inconel overlay) for H₂S and CO₂-rich production.
• Offshore platforms — compact, weight-optimised design suited to skid-mounted
  wellhead assemblies and modular platform systems.
• Conventional production headers — standard interface with API 6A casing spools,
  tubing head spools, and Christmas tree assemblies.

Quality Assurance & Testing

• Material certificates (MTC) to EN 10204 3.1 / 3.2 supplied for every pressure-containing
  component.
• Hydrostatic body test at 1.5× rated working pressure for 30 minutes per API 6A.
• Seat / pack-off leak test at 1.1× WP with zero visible leakage.
• Full-bore drift test using API 6A-approved drift mandrel.
• Dye-penetrate or magnetic-particle inspection on all forged bodies.
• Positive-material identification (PMI) on all alloy components.
• Dimensional inspection report with each shipping unit.
• Full traceability — heat numbers, forged lot numbers, and bolt serial numbers recorded
  on the test certificate pack.

Why Choose CAMTOP

• Full API 6A compliance — every pressure-containing component is monogrammed
  and traceable to API Q1 standards.
• Engineered for flexibility — slip-type or mandrel-type hangers, three
  outlet types, and seven material classes cover every typical well-program requirement.
• Cost-effective conventional solution — competitive lead time and price vs.
  major OEM brands, with the same API performance envelope.
• Compatible with all major OEM equipment — direct drop-in replacement for
  Cameron, FMC, Vetco Gray, and other conventional casing head systems.
• Comprehensive documentation — every shipment includes MTC, dimensional
  report, hydrostatic-test certificate, and operations & maintenance manual.
• Global project-track record — CAMTOP wellhead equipment is currently in service
  on oil fields across the Middle East, North Africa, the CIS, and Southeast Asia.

Ordering Information