Internal Acme Thread Access System – Pyramid Technical Services

Internal ACME Threaded Access Fitting Assemblies

Highly Reliable Intrusive Access Fitting for Solids-Bearing Process Lines

Internal ACME threaded access fittings provide a robust and reliable interface for intrusive corrosion, erosion, chemical injection, and sampling devices in high-pressure process systems. Designed with coarse-pitch ACME threads instead of standard V-threads, these fittings ensure smooth engagement and prevent thread jamming in applications where solids, sand, scale, wax, or debris are present in the process stream.

These fittings are fully compatible with standard retrieval tools and service valves, enabling safe installation and removal of monitoring and injection devices under (Actual)operating pressure.

Key Features :

Internal ACME female thread for improved performance in debris-laden systems.
Coarse thread profile prevents thread seizure caused by solids, scale, rust, or sand.
Ideal for bottom-of-line locations, where solids naturally accumulate.
Fully compatible with all intrusive devices:
– Corrosion coupons & coupon holders
– ER & LPR probes
– Sand erosion probes
– Hydrogen probes
– Bio probes
– Chemical injection & sampling quills
Available in multiple mounting configurations:
– Flarweld
– Butt weldolet
– Socket-weld
– NPT threaded
– Flanged
Designed for high-pressure and high-temperature service.
Suitable for sour service.
Enables safe use with mechanical retrievers & service valves under pressure.

System Function :

Internal ACME threaded access fittings function as the primary pressure boundary and insertion point for intrusive monitoring systems. The internal ACME female thread receives a solid or hollow ACME-threaded plug, which carries the corrosion coupon holder, ER/LPR probe, sand/erosion probe, bio probe, chemical injection quill, or sampling device.

When used with a service valve and mechanical retriever, the assembly enables safe and controlled insertion and retrieval without requiring system shutdown.

Applications :

Production Pipelines Carrying Sand or Solids
Bottom-of-Line Corrosion Monitoring Locations
Sour Service With Scale, SSV Deposits, or Iron Sulfide
Heavy-Oil Lines Where Wax Deposition is Common
Slurry Service and Multiphase Flow Lines
Downstream of Choke Manifolds and Separators

System Components :

Internal ACME threaded access fitting body
Solid or hollow ACME-threaded plug
Seal assembly (gaskets, packing, O-rings as specified)
Service valve (for isolation during retrieval)
Mechanical retriever (for safe under-pressure handling)

Benefits :

Improved operability in debris-prone environments
Reduced risk of thread galling or seizure
Safer retrieval under actual operating pressure
Extended service life due to optimized thread geometry
Universal compatibility with intrusive monitoring and injection devices
Reliable sealing interface for long-term integrity

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