The MMC Closed Cargo Liquid Sampling Device is a portable closed tank sampling system designed for safe and efficient liquid cargo sampling on petroleum and chemical tankers. This device connects easily to the MMC Tank Gauging Station (Vapor Lock Valve) installed on the tank top, allowing operators to collect cargo liquid samples from different levels inside the tank without releasing hazardous vapors into the atmosphere. Its closed sampling design ensures safe cargo handling, environmental protection, and compliance with marine safety standards during tank inspection and cargo quality testing.
The system consists of several key components, including the Tape Reel Device, Storage Barrel, Liquid Filler, and Sampler, all engineered for reliable performance in demanding marine environments. The Tape Reel Device (Model CST) is a gas-tight mechanism specifically designed for safe chemical cargo sampling. It features a manual handle that rotates the reel, enabling the operator to lower or raise the sampler inside the tank smoothly. The reel is fitted with a graduated stainless steel tape (JIS 157 Class) for accurate depth measurement, along with a hook at the end to securely attach the sampler.
Models
- CSTF-F/B
- CSTF-F/R
The CSTF-F/B and CSTF-F/R are both portable closed sampling devices used for cargo liquid sampling, but they have distinct differences in their features and applications.
MMC offers two main models of this closed sampling device: CSTF-F/B and CSTF-F/R. Both are portable closed cargo sampling systems used for collecting liquid samples from storage or cargo tanks, but they differ in certain design features and operational applications to meet specific tank gauging and cargo sampling requirements in the marine, oil & gas, and petrochemical industries.Cargo Liquid Sampler (Model “05L43D”): This 0.5-liter sampler is bottle-shaped to smoothly pass through the tank’s sounding pipe, minimizing contamination risks from dust or rust. Sampling can be performed at any desired depth using a pumping action, facilitated by a check-valve mechanism located at the bottom of the sampler.
Storage Barrel (Model “51S600”): This barrel is used to store the sampler and connect the tape reel device with the liquid filler.
Liquid Filler (Model “SF-FD”) with Exhaust Attachment: These components enable the liquid sample to be transferred into a container via a 3-way valve that allows for either sampling or self-filling, (Model “SF-F/BD”) with Exhaust Attachment: The liquid filler transfers the sampled liquid into a container (glass bottle) through the operation of a 3-way valve, allowing for sampling or self-filling.
This sampling device is designed to be attached to the “MMC” Tank Gauging Station (Vapor Lock Valve) models “C-50” or “F-50,” allowing liquid samples to be collected without releasing hazardous vapors from the cargo tanks.
Typically, liquid containers (such as glass bottles) are provided by cargo owners or surveyors at the port terminal. When using a narrow-neck liquid container, the bottle should be held by hand at the exit of the exhaust attachment, taking care to avoid spills.
For a more secure, gas-tight filling process, MMC offers an optional exhaust attachment with a bottle holder. In this case, a wide-mouth liquid container can be used, with specifications including an internal diameter (ID) of 28-40mm, an external diameter (OD) of less than 50mm, and a capacity of 0.5 liters.
Key Features
Purpose:
- The wiper is used to clean the graduated tape as it is wound up after sampling. It removes adhered liquid or dirt from the tape surface.
Easy Operation:
- The wiper is operated manually by pressing the levers with the thumb and finger while the tape is being wound up.
- The force applied should be adjusted to match the load of the winding process.
Controlled Pressure:
- Excessive force on the wiper lever can generate heat due to friction, so careful control of pressure is necessary.
Long-term Storage Maintenance:
- It is recommended to clean the inside of the Tape Wiper Assembly if the sampling device will be stored for an extended period.
Disassembly & Cleaning Process
- Detaching the Tape Wiper: The Tape Wiper Assembly is fitted in the connector’s upper part of the Storage Barrel. Remove the Storage Barrel and the four bolts of the connector to dismantle the assembly from the reel.
- Disassembly of the Wiper: Take off the Tape Wiper Assembly from the connector. Remove the screws from the wiper housing and the “O” ring to split the housing into two blocks. Detach the housing from the graduated tape.
- Complete Disassembly: Remove the screws from the wiper mat plunger to fully disassemble the wiper. Replace the wiper mats if they show signs of deterioration.
- Cleaning: Clean the inside of the Storage Barrel and the Tape Wiper Assembly thoroughly.
- Reassembly: Reassemble the wiper housing and ensure the graduated tape moves smoothly through the wiper.
- Insert the Tape Wiper Assembly into the connector and refit it onto the reel body.
Secure the Storage Barrel by snapping or hooking it into place.