Cargo Manifold DN300 chemical
Framo Cargo Manifold DN300 chemical — Tanker Cargo Systems.
Inspector Detail
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Common issues
- Valve seat/seal degradation from aggressive chemical cargoes, causing leakage past the disc
- Actuator (air-operated or hydraulic) seal wear leading to slow or incomplete closure
- Stem packing leaks at the gland after repeated high-viscosity cargo transfers
- Galling or seizing of stainless disc/seat surfaces on infrequently operated valves
- Corrosion or pitting at manifold flange faces and reducers exposed to deck weather
- Position indicator or limit switch misalignment giving false open/closed signals
- Gasket failure at manifold flange connections during hose/loading arm connection
Inspection checklist
- Visual check for external leakage at stem gland and body-bonnet joint
- Full open/close function test, confirming indicator agrees with actual disc position
- Inspect disc/seat sealing surfaces for scoring, pitting or chemical attack at scheduled overhaul
- Check manifold flange bolt torque and gasket condition
- Inspect actuator air/hydraulic supply lines for leaks and correct operating pressure
- Confirm reducers, blank flanges and drip trays are present and serviceable
- Check earthing/bonding continuity across the manifold connection
- Verify wetted-part material marking (e.g. SS316) still matches the cargo compatibility list
Service intervals
| Valve function test (full stroke) | before each cargo operation |
| Actuator seal/packing inspection | annually or per maker's manual |
| Internal disc/seat overhaul | typically every 2.5-5 years depending on cargo aggressiveness |
| Manifold gasket renewal | at each hose/arm connection or per condition |
| Position indicator/limit switch calibration | annually |
Typical wear limits
| Stem/gland packing | renew when leakage cannot be stopped by gland adjustment - no universal numeric limit, follow maker's manual |
| Disc/seat sealing surface | reject on visible scoring, pitting or loss of flatness that prevents tight shut-off - confirm against maker's tolerance |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Stem seal/packing set
- Body-bonnet gasket
- Disc seat ring / seat insert
- Actuator repair kit (seals, diaphragm)
- Manifold blank flange and gasket set
- Position indicator switch
Safety
- Chemical cargo exposure during valve maintenance - check cargo compatibility data and wear correct PPE before opening
- Residual cargo or vapour trapped in the valve body - purge and gas-free before dismantling
- Pressurised actuator (air-operated or hydraulic) stored energy - isolate and vent before servicing
- Static discharge risk during cargo transfer - confirm bonding/earthing before connecting hoses
Class survey
Cargo manifold valves fall under the survey of tanker cargo systems; class typically expects records of valve function tests, hose/arm connection checks and leak-free operation evidence at Enhanced Survey. Chemical tanker manifolds additionally require cargo compatibility documentation for the wetted materials.
Components & Design
Component data being added…
Technical Data
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