P/V Valves
2022-01-08
Inspection
- Are the P/V valves being inspected and overhauled as per PMS and maker's instructions?
- Are the P/V valves gas tighten?
- Are the P/V valves being tested for free movement prior cargo operations as required by Ship Shore Safety Check List?
- Are the pressure and vacuum lifting handles freely moving?
- Are the pressure parts (body, weight, shaft, seat, disc, ball, house body) in good order?
- Are the vacuum parts (body, top & lower covers, shaft, seat) in good order?
- Are the vacuum valve screen in good condition and free of rust?
- Is it evidence of P/V valves test?
- Is the test certificate available?
- Is the last date of P/V valve test marked?
- Is the P/V valve test kit in good order?
- Are the operating pressure and vacuum settings marked (i.e. PRESS: + 1400 mmWG // VAC: - 350 mmWG)?
- Are the P/V valves identified with the cargo tank they serve?
- Are the flow curves posted in CCR?
- Is there spare P/V valve available?
Maintenance photos
Common Poor Practices
- P/V valves were leaking.
- P/V valves lifting handles were not freely moving.
- Flame screens found wasted.
- The operating pressure and vacuum settings were not marked.
- The P/V test kit found in poor condition.
References
IMO, TECHNICAL INFORMATION ON SYSTEMS AND OPERATION TO ASSIST DEVELOPMENT OF VOC MANAGEMENT PLANS. MEPC.1/Circ.680. Available: https://wwwcdn.imo.org/localresources/en/OurWork/Environment/Documents/Circ-680.pdf
IMO, International Convention for the Safety Of Life At Sea (SOLAS)
ISO 15364:2021, Ships and marine technology - Pressure/vacuum valves for cargo tanks and devices to prevent the passage of flame in cargo tanks
OCIMF, ICS & IAPH, International Safety Guide for Tankers and Terminals (ISGOTT)
OCIMF, SIRE 2.0