The solvent recovery device is equipped with a pressure vessel, a vacuum system and a heating unit. The state of safety accessories is directly related to the safe operation of the device: safety valve, pressure gauge, blasting disc, vacuum breaking valve, temperature and liquid level protection circuit, which are kept effective item by item, and the safety bottom line of the device is established. The inspection and verification of safety accessories has clear cycle requirements. The service content is to arrange these cycles to the ground, and the verification process is well connected with the operation of the device.
The common short board of safety accessory management is not in technology: when the cycle comes, I don't know how to operate the device during verification, and the verification records are scattered everywhere. Standardizing these management actions is the core value of this service.
The calibration work is outsourced to the organization, but the device side cannot be the shopkeeper: the status check before sending to the school, the technical content review of the report, and the action confirmation after installation and reset. These three steps are checked by the person familiar with the device, so that the quality of the calibration can be guaranteed.
Item by item according to the device configuration: safety valve and pressure gauge on the pressure vessel body, vacuum break and pressure limit protection of vacuum section, temperature control and overtemperature protection of heating unit, liquid level gauge and high liquid level alarm of storage tank, combustible gas detection and interlocking. Create a ledger for each item: location, specification, verification cycle, last verification date, and next due date. The ledger is the basis of all work.
There is another item in the ledger that is easily overlooked: the lead seal and nameplate status of the safety valve and pressure gauge. The accessories with defective lead seal shall be judged as doubtful status even within the calibration cycle, and recheck shall be arranged.
The calibration cycle is determined according to the type of accessories and the use conditions: the safety valve is generally calibrated once a year, the pressure gauge is calibrated according to the grade and the use environment for half a year to one year, the rupture disc is replaced according to the replacement cycle to the number of years, and the combustible gas detector is calibrated according to the calibration cycle. The expiration time of accessories of the same device shall be gathered as much as possible, and multiple calibrations shall be completed at one time by centralized shutdown to reduce the number of device shutdown.
| Attachment | Cycle Reference | Arrangement points |
|---|---|---|
| Safety valve | Generally one school a year | Before expiration, the spare valve shall be in advance, and the switch shall be verified. |
| Pressure gauge | Half a year to a year | The accuracy level is determined by the use environment. |
| bursting disc | Replace by cycle | To the age of the overall replacement and record. |
| Vacuum break valve | Inspection with maintenance | Action test included in maintenance items |
| Level and temperature protection | Inspection with maintenance | Interlocking action simulation confirmation |
| Combustible gas detection | By calibration cycle | Calibration record and interlock check |
The safety valve device cannot be operated without protection during the calibration period: the standby valve shall be installed first or calibrated according to the shutdown arrangement. The time for disassembly, assembly and delivery is set aside in the plan, and the selection of calibration institutions and the filing of reports are implemented in advance. After the verification is completed, the verification report and the device account shall be filed correspondingly, and updated synchronously at the next expiration time to form a rolling account.
The conventional method is to switch the standby valve: install the calibrated standby valve, switch online, remove the expired valve and send it to calibration. The switching operation shall be executed according to the operation ticket, and the pressure shall be confirmed before and after the switching, and the device shall not be out of protection in the whole process.
Do three things on a daily basis: during patrol inspection, visually inspect the status of accessories-lead seal, nameplate and meter instructions; Due reminders shall be rolled out according to the ledger. Update the ledger synchronously after the device is modified. If the ledger is not updated, it will become invalid the following year.
The role of the interlocking circuit is only reflected in the action, not simulation do not know good or bad. It is a common practice to do action simulation with annual maintenance, and the simulation records and maintenance data are filed together as evidence of protection effectiveness.
This article by LuoyangWohong PetrochemicalEquipment Co., Ltd. arranges that the company provides design, manufacturing and operation and maintenance services for condensation recovery, membrane separation recovery and complete solvent recovery devices for chemical and pharmaceutical enterprises. If you need process evaluation or scheme configuration, please contact and exchange.
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