This hub explains why installed valves fail, how faults are confirmed, which maintenance routes remain credible, and when isolation or replacement is required.
Knowledge hub
Online valve maintenance knowledge
Clear answers that help operators find faults and choose the next step.
Pillar topics
Six guide groups for valve decisions
Each group answers one operating question with clear examples from field work.
Online valve maintenance fundamentals
Learn how online maintenance treats valves in live, pressurised pipelines. The guides explain when to use cleaners, lubricants and sealants.
Read the guidePassing valves: diagnosis and repair
Learn why a closed valve leaks, how to confirm the fault, and which repair routes remain credible.
Read the guideValve sealant injection explained
See how non-hardening sealants support damaged surfaces while the valve can still move. The guides also explain why controlled high-pressure injection equipment matters.
Read the guideHard-to-operate valves
Learn how dried residue, dirt and poor lubrication can restrict valve movement. The guides explain checks to make before choosing cleaner or lubricant.
Read the guideLive leak sealing and fugitive emissions
Learn about stem and body leaks while equipment stays installed and pressurised. The guides link maintenance choices with lower fugitive emissions.
Read the guideValve integrity management
Build a planned routine from surveys, treatment history and operating results. The guides show how clear records support maintenance across many valves.
Read the guide
All guides
Every guide, grouped by topic
Each guide is written to the same reviewed engineering standard.
Pillar guides (9)
- Choosing an online valve maintenance provider: the complete guide
- External valve leaks on live lines: stem, bonnet and body-joint limits
- Hard-to-operate valves: causes and fixes
- Online valve maintenance: the complete guide
- Sealant injection equipment buying guide
- Valve integrity management for pipelines
- Valve lubrication: the complete guide to greases, lubricants and sealants for valves
- Valve sealant buying guide: selection, specification and supply
- Valve sealant injection: how it works and when
Symptoms and diagnosis (19)
- Actuator torque trip: check valve mechanics first
- Ball valve passing: debris, seat damage or a false sign?
- Body and bonnet joint leaks on live valves
- Buried and chamber valves: why they deteriorate faster
- Cavity pressure in ball valves: the symptom explained
- Double block and bleed will not hold: which valve passes
- Downstream pressure rising after isolation
- Dry-gas valve leakage: lubricant loss, seal behaviour and compatibility checks
- Gate valve will not seal: causes and fixes
- Handwheel will not turn: find the fault before torque
- Sand contamination in wellhead and pipeline valves: ingress, wear and flushing limits
- Sectionalising valve fails its closure test: now what?
- Seized plug valve: diagnose before applying force
- Stiff gear operator or stiff valve: telling them apart
- Valve fails the bubble test: severity and next steps
- Valve passing after hydrotest: why new lines leak
- Valve seized after years idle: why unused valves fail
- Valve stuck mid-travel: causes of incomplete stroke
- Valve torque rising year on year: what it means
Procedures and practice (11)
- Buttonhead injection fittings: identification, ratings and checks
- Condition-based sealant top-up planning: service severity, leakage history and inspection triggers
- Estimating valve sealant quantity under uncertainty
- Exercising live valves: purpose, limits and stop-work conditions
- Injection pressure versus line pressure: safety rules
- Online sealant injection: pre-job checks, execution stages and acceptance evidence
- Per-valve service records: what to log and why
- Pre-injection safety check: ratings, barriers and stop-work conditions
- Valve-cleaner dwell time: controlling factors and how to decide when to retest
- What a valve condition survey covers
- What cannot be fixed online: honest valve repair limits
Products explained (9)
- Avoiding counterfeit valve products
- Sealant selection by seat design, injection system and service medium
- Selecting sealant for temperature service: envelope, excursions and evidence
- Valve cleaner before sealant injection: purpose, limits and compatibility checks
- Valve lubricant versus valve sealant: when each is right
- Valve sealant compatibility: media, elastomers and old product
- Valve-sealant storage and field acceptance: shelf life, contamination and heat exposure
- Why general-purpose grease is not automatically a substitute for valve lubricant or sealant
- Why some valve sealants harden in dry-gas service
Injection equipment (7)
- 10,000 PSI injection equipment: what the rating does and does not permit
- Choosing injection equipment by pressure, volume and field constraints
- High-pressure gun safety rules
- Hoses, couplers and adapters for injection work
- Injection-gun failure signs: repair, pressure testing and retirement criteria
- Keeping sealant guns reliable
- The complete field kit for online valve service
Decisions and economics (6)
- Budgeting valve maintenance across a network
- Building a shutdown-cost case for valve work: cost categories, boundaries and assumptions
- How maintenance can extend valve service life, and where it cannot
- Online valve repair vs replacement: real cost comparison
- The maintenance-free valve myth: a balanced view
- Valve fugitive emissions: leak paths, LDAR evidence and maintenance response
Standards and compliance (8)
- API 598 seat-leakage acceptance criteria: what the test does and does not prove
- API 6D and valve maintenance
- ASME B31.8 on valve maintenance
- ISO 15848: fugitive emissions from valves
- ISO 5208 leakage rates: reading the classes
- Isolation readiness: evidence a sectionalising valve will close and seal
- PNGRB T4S and Indian CGD valve upkeep
- Warranty-period valve care: follow OEM instructions and preserve claim evidence
Industries (5)
Deep technical topics (25)
- After pigging: debris risks to mainline valves
- Baselining valves with no service history
- Can injection fittings be retrofitted to an installed valve? Design, approval and pressure-boundary limits
- Differential pressure and seat sealing: why leaks vary with conditions
- ESD valve partial-stroke testing: what it proves, what it cannot, and what evidence is still needed
- Field seat-leak testing methods compared
- Flooded valve chambers: assessment after water ingress
- Full travel does not prove tight shut-off
- Hydrogen-blend service: seal compatibility, leakage monitoring and limits of existing valve evidence
- Low-temperature valve problems: icing, seal contraction, lubricant viscosity and actuator readiness
- Managing a temporary injected seal
- Obsolete valves with no OEM spares: inspection, repairability and replacement planning
- Over-injection: cavity packing and operational effects
- Planning live valve maintenance: operations gates, SIMOPS, sequencing and contingency
- Preserving stored and spare valves
- Reading a valve survey report: what good evidence looks like
- Reading valve nameplates before maintenance
- Sealant injection has no uptake
- Single-valve isolation, DBB and DIB: what each arrangement actually provides
- Stem packing systems: types and live-adjustment limits
- Through-conduit gate valves: sealing behaviour and maintenance needs
- Valve criticality ranking: consequence, isolation role and evidence quality
- Wet, sour and CO2-bearing gas: corrosion, deposits and seal compatibility in valves
- Why bubbles, sound and pressure decay cannot be converted directly into API 598 or ISO 5208 leakage classes
- Why trunnion and floating ball valve seats leak differently
Field practice (5)
- Leaking or damaged injection fittings on live valves: warning signs, pressure-boundary risks and stop-work limits
- Measuring valve torque in the field: methods and trend value
- Proving isolation before excavation or hot work: the valve's role
- Seat vs stem injection points: what each treats
- Turning valve service records into replacement forecasts
More topics (1)
Lubrication and sealant science (26)
- Corrosion protection inside valve cavities: what a compound film can and cannot do
- Elastomer compatibility: why some compounds swell or harden seals
- Fibres and fillers in valve sealants: how they bridge leak paths
- Galling in valve trims: how metal surfaces weld and how lubrication prevents it
- Grease consistency: what a consistency grade describes and what it does not
- Grease or oil: the difference and what it means for valves
- Grease thickeners explained: soaps, complexes and non-soap systems
- How valve cleaners soften residue: solvency, wetting and dwell
- How valve compounds behave at high temperature
- How valve grease ages: oxidation, bleed and hardening
- Hydrocarbon resistance: why bearing greases dissolve in oil and condensate service
- Injectable compounds versus applied lubrication: why installed valves need injection
- Low-temperature pumpability: getting compound through fittings in cold service
- Lubricant films under seat load: why the film matters for sealing
- Mineral versus synthetic base oils in valve compounds
- Mixing valve compounds from different suppliers: what can go wrong
- Oil separation in stored and injected compounds
- Oxygen, chlorine and reactive chemical service: why compound choice is a safety decision
- Sand in the cavity: how debris becomes a lapping compound
- Solid additives in valve compounds: PTFE, graphite and molybdenum disulphide
- Steam service valves: lubrication and sealing behaviour under heat and condensate
- Valve lubricant versus anti-seize compounds: roles on stems, threads and trims
- Valve sealant is not thread sealant or pipe dope
- Washout: why line media strip ordinary grease from valve seats
- Water resistance: why wet service needs specific valve compounds
- Why valve sealants must not harden: the non-hardening principle
Product selection and specification (26)
- Chemical plant valves: compatibility-first compound selection
- Choosing a cleaner that is safe for elastomer seals
- City gas networks: choosing compounds for many small valves
- Cleaner, lubricant, sealant: choosing the right sequence for one valve
- Compounds for actuated valves: keeping torque within actuator limits
- Crude oil and produced fluid service: compound selection
- First fill at commissioning versus maintenance top-up: is it the same product?
- Food-grade and non-toxic lubricant questions for valves: what to verify
- High-pressure valve service: compound behaviour and injection considerations
- LPG and light hydrocarbon service: sealant and lubricant selection
- Lubricated plug valves: choosing the right plug valve sealant
- Natural gas transmission valves: sealant and lubricant selection
- Planning compound quantities for a multi-valve campaign
- Reading a valve compound datasheet: which fields matter for selection
- Refinery process valves: compound selection across hot, sour and hydrocarbon duties
- Sample and trial quantities: proving a compound on one valve first
- Selecting sealant and lubricant for gate valves: wedge, slab and expanding gates
- Selecting sealant for ball valves: soft-seat, metal-seat and trunnion designs
- Standby and idle valves: choosing a lubricant that stays put
- Sticks, cartridges and bulk: sealant packaging forms and the equipment they suit
- Ten questions to ask any valve sealant supplier
- The data an engineer needs to recommend a valve sealant
- Water and wastewater valves: lubricant and sealant considerations
- Wellhead gate valves: lubricant selection under sand and pressure
- When a custom formulation is worth it, and when a standard compound fits
- Writing a valve sealant specification: the wording that gets the right product
Equipment selection and ownership (20)
- Air-operated injection guns: ratio, double-acting pistons and delivery
- An inspection log for injection equipment
- Building an equipment safety programme for your team
- Commissioning new injection equipment: first-use checks
- Compressed air for injection guns: what the site must provide
- Equipping a site for online valve maintenance: guns, pumps and consumables by valve population
- Gauges on injection equipment: reading, checking and replacing
- Gun service kits: what minor and major kits cover
- Injection equipment for offshore and remote sites: weight, air and logistics
- Injection equipment service and repair: how the programme works
- Inspecting and retiring high-pressure hoses
- Owning injection equipment versus relying on a service provider
- Pump systems for large valves and long campaigns
- Selecting adapters for unfamiliar fitting types
- Spares to hold for injection equipment
- Storing and transporting injection equipment between jobs
- Stroke counters: measured delivery for accountable injection
- The hydraulic hand gun explained: how a BTR450D-class gun works
- Training before first injection: what operators must be able to do
- What to tell us before an equipment enquiry
Working with a service provider (30)
- Agreeing acceptance evidence before the job starts
- Annual maintenance contracts explained
- Comparing service proposals: what to weigh beyond the number
- Defining scope for a multi-valve campaign
- Emergency call-outs: what happens when a valve stops planned work
- Follow-up after service: monitoring and re-visit triggers
- From one-valve trial to a programme
- Handover: leaving your team able to maintain what we treated
- How a BTR VSI service visit works, from enquiry to record
- If injection does not restore the valve: the escalation you will get
- Keeping supply continuous: reorder planning for compounds
- Mobilising a field team from India: what the timeline depends on
- One valve or a programme: which engagement fits
- Operator training: what a programme covers
- Permits, access and escorts: what the provider needs from the site
- Pre-commissioning and commissioning support for new valves
- Questions to ask before hiring an online valve maintenance provider
- Red flags when choosing a valve maintenance contractor
- Remote technical support: guiding your team through a job
- Safety documentation to expect from a field team
- Shipping compounds and equipment internationally: what we need to know
- Site readiness before a field team arrives
- Supporting a turnaround: valves to treat before, during and after
- The service record you receive after each valve
- Train your team or hire the service: how to decide
- What happens after you send a valve problem
- What to send in a first enquiry: valve data that speeds up the answer
- Why we survey before we recommend
- Working around production: night shifts and short windows
- Writing an RFQ for online valve maintenance
Comparisons and alternatives (24)
- Chemical cleaning versus mechanical intervention for fouled valves
- Cleaner injection versus applying force to a stiff valve
- Contract versus call-out: which service model fits your valve population
- Doing sealant injection yourself: what can go wrong without training
- Gate versus ball valves: which is easier to maintain online
- General-purpose grease gun versus valve injection gun
- Grease nipples versus buttonhead fittings: why valves use buttonheads
- Injection versus leak clamps and enclosures for external leaks
- Local grease supplier versus valve compound manufacturer
- Low-cost compound versus fit-for-purpose: total cost thinking
- Lubricated versus non-lubricated plug valves: maintenance implications
- New, refurbished or maintained: three routes for an ageing valve
- OEM service versus online maintenance specialist
- Online maintenance versus shutdown repair: choosing by valve condition
- Preventive versus corrective valve maintenance
- Replacing the actuator versus treating the valve when torque rises
- Scheduled top-up versus run-to-failure
- Soft-seated versus metal-seated valves: sealing and maintenance differences
- Stem sealant injection versus repacking the gland
- Survey-led programme versus blanket treatment of every valve
- Synthetic versus organic valve sealants
- Temporary injected seal versus permanent repair: planning both
- Treat now or monitor: choosing between action and watching
- Wellhead lubricant versus pipeline sealant: different jobs
Valve types and applications (26)
- Active seats versus static seats: why cycling changes the sealing picture
- Biogas and landfill gas: wet, corrosive and variable
- Butterfly valves: why injection rarely applies
- Check valves: what online maintenance can and cannot do
- CNG stations: high-pressure small valves and frequent operation
- Compressor station and manifold valves: frequent cycling duty
- Control valves: stem lubrication and what to leave to the instrument team
- Drilling and completion valves: choke manifolds and frac trees
- Fertiliser and ammonia plants: compatibility-led valve care
- Fire water and deluge systems: valves that must move on demand
- Gate valve cavities: bonnet cavity, seat pockets and sealant behaviour
- Globe valves: online maintenance limits
- Grease-less valves: what the claim means and what still needs lubrication
- Hygienic and pharmaceutical valves: why injection maintenance is usually excluded
- Large-bore mainline valves: quantities, access and actuators
- LNG and cryogenic valves: why injection compounds rarely apply
- LPG bottling and storage valves: small valves, high counts
- Lubricated plug valve maintenance: the sealant is part of the design
- Marine terminal and jetty valves: salt, tides and schedules
- Petrochemical plants: solvents, monomers and compound selection
- Power plant valves: steam, feedwater and fuel gas
- Slurry and mining valves: abrasion and the limits of sealant
- Tank farm and terminal valves: product changeovers and standing time
- Topside versus subsea: where injection maintenance applies offshore
- Wellhead gate valves: why lubrication is routine, not repair
- Where sealant goes in a ball valve: seat rings, cavity and stem
Evidence, trials and vendor evaluation (22)
- A trial scope template for online valve maintenance
- Asking for references and case history: what to check
- Auditing a vendor's capability: products, equipment, people, records
- Before-and-after evidence: what a credible result looks like
- Bench and sample testing before buying a compound
- Choosing the acceptance test for an online repair
- Designing a pilot programme across a small valve set
- Evidence grades: witnessed test, operator report and inference
- How to read a valve maintenance case study critically
- KPIs for a valve maintenance programme
- Live demonstrations: what a demo can and cannot prove
- Maintenance evidence that stands up to a regulator or auditor
- Measuring torque improvement after treatment
- Photographs and video as evidence: what to capture
- Recording cost avoidance from online maintenance honestly
- Running a one-valve trial: design, evidence and decision rules
- Test-bed evidence versus field evidence
- The decision log: turning survey findings into an approved plan
- Verifying experience claims: years, sites and valve types
- What ISO certification tells you about a maintenance provider, and what it does not
- When a trial fails: what it tells you and what to do next
- Witnessing acceptance tests: who signs, what is recorded
Programme playbooks (22)
- A lessons-learned register for valve work
- A training matrix for valve maintenance teams
- After a valve failure: the review that improves the programme
- Ageing valve populations: strategy for life extension and replacement
- Assessing operator competency for injection work
- Building a valve register: fields, sources and upkeep
- Integrating valve maintenance with LDAR programmes
- Justifying a valve maintenance budget to management
- Management of change for injected valves
- Managing contractors on live valve work
- Permit-to-work design for online valve work
- Recording valve maintenance in a CMMS: fields that matter
- Seasonal planning: monsoon, heat and cold in the valve calendar
- Sequencing a multi-site campaign
- Setting up a framework agreement for compounds and services
- Starting a valve maintenance programme from zero
- Stocking compounds and consumables for a programme
- Tagging valves for records: tags, photos and simple digital IDs
- Taking over new assets: valves in acquired or commissioned plants
- The annual valve programme review
- Valve maintenance for small operators with few staff
- Writing a site SOP for sealant injection
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Interactive tools
Check your valve in minutes
Two free tools built from reviewed guidance and published study data. No sign-up, and nothing is collected.
Interactive tool
Passing valve screening check
Screen the symptoms, identify what must be confirmed, and find the next safe step.
Run the checkInteractive data
How pipeline valves fail
Explore the four failure modes from published study data. Passing valves formed 61% of faults in the cited study population.
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