HUNTING X-Over, Manual, Page: 10 / 20

Page 10 of 24
Hunting Energy Services (Well Intervention) Ltd
4.0 Maintenance
We recommend that all pressure containing equipment be subjected to a formal maintenance
schedule, devised to ensure that the equipment is always fit for purpose. If followed correctly this will
minimise downtime and ensure the safety of those who need to work with and around it. Many
companies have established preventive maintenance programs that require re-certification of the
equipment on a quarterly, semi-annual, or annual basis.
Ideally, any X-Over should be stripped, redressed and tested prior to every job, or every quarter as a
minimum. It should be flushed out and all internal surfaces greased after every job. If possible it
should be stored filled with clean oil.
The procedure specified by Hunting is the recommended minimum. This will be superseded by
the policies of individual companies.
4.1 Routine maintenance

Completely disassemble all components and clean thoroughly before inspecting for wear,
corrosion or damage. Pay particular attention to metal/metal seal surfaces on X-Overs.

Seal bores must be inspected thoroughly

Threaded connections must be inspected thoroughly

Elastomers showing any wear should be replaced

Equipment must be fully function tested once reassembled
BEFORE EVERY JOB:

Certification should be checked to confirm equipment compliance with operational needs

Confirm all component pieces are tightened correctly

Pressure test and function as per operational requirements
AFTER EVERY JOB:

Disassemble, clean and inspect all components

Inspect all seals and sealing surfaces, replace as necessary

Check all threaded connections

Reassemble as per the assembly instructions

Pressure test to working pressure
WHEN CHECKING COMPONENTS FOR DAMAGE OR WEAR:
Particular attention should be paid to:

Sealing surfaces

Threads
Lubricate all sealing surfaces and install new seals if required.