Equipment Management Analysis Report

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Number: AXSH/BZ-01 Monthly Equipment Management Report [2019], Issue 1 – Equipment Department, February 1, 2019

Table of Contents
I. Equipment Operation Status..................................................................................... 1
1.1 Operation Status of Moving Equipment........................................................... 1
1.2 Operation Status of Static Equipment........................................................... 2
Summary of Static Equipment Usage in January............................................. 2
Leakage rates at static sealing points in January are shown in the table below:....................................................... 3

II. Equipment Maintenance Status..................................................................................... 5
2.1 Analysis of Maintenance for Mechanical Equipment........................................... 5
2.2 Analysis of Maintenance for Electrical Equipment........................................... 6
2.3 Analysis of Maintenance for Instrumentation Equipment................................... 7

III. Spare Parts Consumption............................................................. 7

I. Equipment Operation Status
1.1 Operation Status of Moving Equipment
Table 1-1: Statistics on Equipment Operation Indicators
| Item | Equipment Integrity Rate | Equipment Maintenance Rate | Equipment Rework Rate |
|-------|--------------------------|----------------------------|----------------------|
| All Equipment | | | |
| Special Equipment | | Total Maintenance Count | Maintenance Rate (%) |
| Number of Units Reworked | Rework Rate (%) | | |
| Workshop 1 | 167 | 167 | 100.00 | 18 | 18 | 100 | 12 | 7.19 | / | / |
| Workshop 2 | 113 | 113 | 100.00 | 15 | 15 | 100 | 3 | 2.65 | / | / |
| Workshop 3 | 125 | 125 | 100.00 | 13 | 13 | 100 | 4 | 3.20 | / | / |
| Workshop 4 | 105 | 105 | 100.00 | 9 | 9 | 100 | 4 | 3.81 | / | / |
| Public Works Department | 197 | 195 | 98.98 | 34 | 34 | 100 | 11 | 5.58 | / | / |
| Storage and Transportation Department | 114 | 114 | 100.00 | 14 | 14 | 100 | 1 | 0.88 | / | / |
| Quality Inspection Department | 90 | 90 | 100.00 | / | / | 0 | 0.00 | / | / |
| Total | 911 | 909 | 99.78 | 103 | 103 | 100 | 35 | 3.84 | / | / |

Electrical Maintenance: 652 units, 649 repaired, 99.54%; 6 units required rework, 0.92%
Instrumentation Maintenance: 2760 units, 2758 repaired, 99.93%; 12 units required rework, 0.43%

Figure 1-1: Distribution of Equipment Maintenance Tasks
As can be seen from Table 1-1, the total number of moving equipment units is 911. In January 2019, 35 moving equipment units were repaired, resulting in a maintenance rate of 3.84%； A total of 652 electrical devices, with 6 units requiring repair; the repair rate is 0.92% ； 2,760 instrumentation devices, 12 were repaired, with a repair rate of 0.43%. This month, the mechanical equipment, electrical equipment, and instrumentation in the plant have been operating well, with stable performance. One of the units had to undergo an emergency shutdown and restart due to a leak in its heat exchanger; as a result of these shutdowns and restarts, the number of equipment repairs was slightly higher than usual ； The maintenance of the remaining equipment in the operation department is proceeding normally. According to the special inspection conducted in January 2019, the lubrication and maintenance of mechanical equipment in various operation departments were still inadequate; there were serious issues such as lubricant deteriorating without timely replacement, and equipment not being lubricated as required. All operation departments were instructed to carry out comprehensive rectifications in February to ensure that the equipment remained properly lubricated. For devices with a high maintenance rate, the owner should pay close attention. Analysis of the maintenance status of key equipment: One key piece of equipment was under maintenance – the old hydrogen production dissociation gas compressor. During operation, it was found that the exhaust temperatures at stages 3 and 4 were high, and the gas valves were not functioning properly. The equipment was disassembled for inspection, and it was discovered that the valve discs and valve springs at stages 3 and 4 were damaged; as a result, these inlet and outlet valves were replaced. Since it started operating without a backup unit, this unit has been in use continuously; the air valve has been in use for 6 months, which is within the normal service life expected for such a valve. During operation of New Hydrogen Compressor Unit A, abnormal noises were heard from the first-stage east exhaust valve, and its temperature was found to be elevated. After shutting down the unit for inspection, it was discovered that the valve plate of the first-stage east exhaust valve was worn. The valve plate was replaced; this fault is considered to be normal wear and tear of a consumable component. At the site, there was an odor of hydrogen sulfide coming from the LPG pump P1203B. It was determined that this was due to a mechanical seal leak. Upon disassembly and inspection, it was found that the spring was stuck, and the mechanical seal showed slight wear; thus, the mechanical seal was replaced. This device uses a mechanical seal of the standard type C8B-60 for sealing. Mechanical seals do have a certain degree of leakage, but since the fluid handled by this pump is liquefied gas containing hydrogen sulfide, even slight leaks can have adverse effects. Numerous attempts at repair and replacement of the mechanical seal have yielded little success; therefore, it is planned to modify the cooling water system for this pump by adding cooling water for the mechanical seal. Given the hazards of liquefied gas, it is recommended that the owner upgrade the sealing of this pump to a series seal, thereby essentially eliminating the risk of liquefied gas leaks. Repair of the liquid nitrogen pump: the issue was packing leakage. It was found that the plunger, packing, and piston rings were severely worn; two pieces of packing and piston rings were replaced. This equipment has not had its components replaced since it started operating in 2017, and there was slight leakage. After the workshop submitted a request for replacement parts, the repairs were carried out, which constitutes routine maintenance. Three key maintenance equipment were operated: the sodium hydrosulfide circulation pump P103D, which had a seal leakage issue; upon disassembly and inspection, mild wear was found on the friction pairs of the seal, so the seal was replaced. The high maintenance costs for this equipment are mainly due to process and medium-related factors; the medium tends to crystallize, which can lead to corrosion of the mechanical seal rings and thus seal failure. It is recommended that the workshop modify the seals and employ steam purging and cooling methods, as well as control the process operations to avoid vacuum conditions. Electrodesalination feed water pump: packing leakage; tightening was ineffective; severe packing wear was detected, so new packing was installed ； The high maintenance rate of this equipment is mainly due to the poor separation performance of the electrodesalination oil and water, as well as overly tight packing gland seals, which accelerates the wear of the packing and results in a higher frequency of packing replacement. Key equipment for maintenance by the Public Utilities Department: Maintenance of denitration pumps P1061 and P1062; the fluorine lining inside the pumps has aged and cracked, so new pump bodies need to be installed ； The device was in use for 1 year, and severe cracking of the fluoropolymer lining inside the pump body occurred. The operating conditions of the device met the design requirements; the main cause was a quality issue with the device, and the relevant issues have been reported to the appropriate departments. The plant owner’s workshop has requested the replacement of the new pump, as the equipment is now ready for use. For the fire protection pressure stabilizing pump X003, inspection upon disassembly revealed that the impeller hub was broken; based on the signs of the fracture, it appears that the break was caused by prolonged cracking and expansion. For cast iron fittings, stricter quality inspection should be carried out to avoid stress concentration during installation. Repairs to the remaining equipment are all normal maintenance during use. 2. Operation status of static equipment: Summary table of static equipment usage in January 1-2, Table of static equipment failures. Total number of static equipment units, Number of failures, Failure rate (%), Units that have been repaired, Units awaiting repair. Operation Unit 1: 177 units, 1 failure, 0.56% failure rate; 1 unit repaired, 0 units pending repair. Operation Unit 2: 102 units, 2 failures, 2.94% failure rate; 2 units repaired, 0 units pending repair. Operation Unit 3: 158 units, 0 failures, 0.00% failure rate; 0 units repaired, 0 units pending repair. Operation Unit 4: 90 units, 0 failures, 0.00% failure rate; 0 units repaired, 0 units pending repair. Public Works Department: 44 units, 1 failure, 2.27% failure rate; 1 unit repaired, 0 units pending repair. Storage and Transportation Department: 74 units, 0 failures, 0.00% failure rate; 0 units repaired, 0 units pending repair. As can be seen from the above table, there were 4 failures in static equipment in January 2019, all of which have been resolved, and the equipment is now ready for use. Among them: For one unit, on January 25, 2019, it was observed that the circulating water temperature in the heat low-temperature cooler E1107A/B varied significantly; a tube bundle leak was confirmed, leading to an emergency shutdown of the plant. The entire heat exchanger was disassembled and sent to the equipment manufacturer for pressure testing. It was found that one of the tubes in the tube bundle of heat exchanger E1107A was leaking. The repair team sealed the leak, and after the pressure test passed, the heat exchanger was returned to the plant for reinstallation. The material of this equipment is 15CrMo with a nickel-phosphorus coating; the medium contains hydrogen sulfide, which is corrosive. The high temperature and large pressure difference mean that the heat exchange tubes are prone to hydrogen-induced cracking as a result of hydrogen generated by corrosion invading the steel in acidic environments containing hydrogen sulfide. Based on usage patterns, the service life of this tube bundle is generally around 6 months. It is recommended that the owner upgrade the material to Incoloy 825 and modify the equipment processes, in order to prevent equipment failures from having a significant impact on safe production. During Operation Phase 2: The tube sheet of the cooler for the new hydrogen compressor E5006AB developed leaks after high-pressure cleaning of the heat exchanger tubes. This equipment had been in operation for nearly 4 years without the tube bundles being replaced; during maintenance in 2018, pressure testing was carried out successfully, and it was found that the welds on the tube sheet had suffered from erosion. Currently, both heat exchangers have been fitted with new tube bundles and are operating normally. Public Utilities Department: On January 26, 2019, inspections revealed leaks due to sand holes in the welds of the cut-off valve for the 23T high-level tank as well as in the welds of the tank at the northern end. The workshop carried out emergency repairs while the cracking process was suspended; now the hazards have been eliminated and normal operation is possible. In addition, there are potential hazards in various units of the company that require close monitoring; a total of three pieces of equipment need to be under special attention. The status of these three devices is as follows: Operations Department 2: On August 17, 2018, operations were suspended urgently due to flooding, and an hydrogen sulfide alarm was detected in the circulating water, confirming that there was a leak in the tube bundle of the top water cooler of the E5007 hydrogen sulfide removal stripping tower. Since the unit began operation, this heat exchanger has been in use for nearly 4 years; the gas at the top of the cooling medium tower is rich in hydrogen sulfide, resulting in severe corrosion of the tube bundle. The equipment’s shell and tube sides are currently isolated by blind flanges; it is out of service, and its safety condition is under control. The unit operates normally with cooling achieved through air cooling; the tube bundle has been submitted for replacement during the maintenance in 2019. Incident No. 4: On September 2, 2018, during routine inspections, plant staff discovered leakage at the thread plug on the head of the 6# low-temp oil heat exchanger E-2105B. Due to severe rusting of the thread plug, it was not possible to tighten it. A leak detection sign was placed at the site, inspections were intensified, and the workshop was instructed to develop preventive measures. Minor leaks are under control; the workshop is monitoring their use closely pending thorough repair. Unit 4: Since its commissioning in 2017, there has been a slight leakage of oil below the Ω-ring of the E2103A hot high-pressure separator/hydrogen exchanger. However, no hydrogen leakage was detected during the commissioning leak test or routine inspections. The leaking oil is likely lubricating oil applied during installation. The plant owner’s workshop contacted the manufacturer’s technical staff for an on-site inspection, but the limited range of inspection methods severely affected the accuracy of the results. The manufacturer’s technical staff recommend returning the equipment to the factory for a comprehensive inspection and repair of the Ω ring during shutdown for maintenance; the relevant maintenance tasks have been approved. Comprehensive analysis: Equipment failures were particularly frequent this month. The main reasons are as follows: ① The material used for the equipment is not suitable for the current corrosive conditions. The operation pressure of the E1107 heat exchanger is high due to the use of low-boiling-point gas recovery systems; investigations into the operating conditions of similar units have shown that, in the absence of such recovery systems, the operation pressure of those units is lower. ②Some equipment has a long operational lifespan; although pressure and leak tests are carried out on them during maintenance, as operating time increases, corrosion worsens, leading to corrosion-induced leaks in the equipment. In February 2019, the Equipment Department organized workshop technicians to conduct an in-depth analysis of the static equipment failures that occurred that month. Special attention was given to containers, heat exchangers, air coolers, and pipelines in systems exposed to high temperatures, high pressures, and severe corrosion conditions; efforts were made to better assess the impact of such corrosive environments on the materials used in these devices. The service life of key equipment was evaluated, a comprehensive inspection of such equipment was carried out, and targeted plans were developed to address potential hazards. The leakage rates of static seal points in January are shown in the table below: Table 1-3: Statistics on Leaks at Equipment Static Seal Points. Static Seal Point, Number of Leaks at That Seal Point, Leakage Rate (‰), Sealed, Under Repair. Unit 1: 15,250, 1, 0.07, 0, 1. Unit 2: 8,975, 4, 0.45, 0, 4. Unit 3: 6,976, 0, 0, 0, 0. Unit 4: 9,692, 4, 0.41, 0, 4. Public Utilities Department: 6,523, 1, 0.15, 0, 1. Storage and Transportation Department: 5,275, 3, 0.57, 0, 3. Figure 1-2: Distribution Chart of Leaks at Equipment Static Seal Points. Table 1-4: Detailed Information on Leaks at Equipment Static Seal Points. Operations Department: Serial Number, Inspection Date, Correction Date, Equipment Location and Name, Type of Fluid Leaking, Location of Leak and Measures Taken to Stop the Leak, Analysis of Causes of Leak, Whether Equipment Meets Operational Requirements, Remarks. Unit 1: 1, 2019.1.29, 2019.1.31, Third-stage control valve of the new hydrogen compressor; Hydrogen was leaking from the valve stem ； Manufacturer handles grinding of valve stems, replacement of packing; valve stem wear, slight leakage. Post-holiday maintenance work, Operation Department 2. 1: 2018.8.27 to 2018.9.1. Leakage of diesel at the outlet flange of the stripping tower; clamps have been installed. Operations resumed normally after the flood. Gasket failure: Enhanced monitoring required. 2018.09.15 – Maintenance was carried out to replace the gaskets. Leakage at the seat of the safety valve at the P5003A outlet; low liquid level, so tightening was performed. The gasket dimensions measured by the manufacturer were incorrect: Enhanced monitoring required. 3 2018.11.10 – Maintenance was carried out to replace components; leakage at the packing of the root valve of the fine reaction reactor. Diesel was involved in this issue; the remote sensing gauge has now been removed and the root valve has been fully closed. Replacement of the remote transducer caused leakage; the root valve was closed as a result. The device was shut down, and monitoring was intensified. Completed on 2018.12.31; sealing with glue was carried out on 2019.1.19. Leakage at the gland of the inlet flange valve on the shell side of E5007. Sealing was achieved by applying glue to the valve’s sealing cover; the gland gasket had failed. Monitoring was intensified. Department 4: 1. On 2018.10.25, leakage occurred at the thread plug of pump P2116AB at the bottom of the atmospheric tower. High temperature of the fluid caused slight leakage. Maintenance was requested to address the issue promptly. 2. On 2018.8.5, leakage occurred at the valve of the old sampling system for circulating hydrogen; the valve packing had failed, resulting in slight leakage. Welding was required, and it has been scheduled for maintenance. 3. On 2018.8.6, leakage occurred at the solenoid valve used for backwashing. The Operations and Maintenance department tried to fix it by tightening the connections, but slight leakage persisted. The sealing part of the solenoid valve had failed; a new valve was ordered and will be replaced once it arrives. 4. On 2018.9.2, leakage occurred at the thread plug of the head of heat exchanger E2104 in unit 6/#. The gap between the thread plug and the surrounding parts was slightly too large, causing slight leakage. Maintenance has been scheduled. Department of Storage and Transportation: 1. Gaskets or valves need to be replaced. For the discharge valve of tank V806, the fluid is crude oil. Actions taken: The bolts securing the valve gland were tightened, but slight leakage still occurred. It is necessary to replace the gland gasket or the valve itself. Reasons for leakage: Quality issues with the valve or problems related to the fluid being transported. Slight leakage; monitoring was intensified. 2. Gaskets or valves need to be replaced. For the discharge valve on the south side of tank V616, the fluid is diesel. Actions taken: The bolts securing the valve gland were tightened, but slight leakage still occurred. It is necessary to replace the gland gasket or the valve itself. Slight leakage; monitoring was intensified. 3. The agitator in tank V602 needs to be removed so that the gasket can be replaced. The fluid in this tank is residue oil. Leakage occurs at the connection point between the agitator and the tank body. Actions taken: The flange bolts were tightened. Slight leakage occurs when the oil temperature is high; it is necessary to stop operations, remove the agitator, and replace the gasket. Reasons for leakage: The high temperature of the residue oil (around 160°C) affects the gaskets. Slight leakage; monitoring was intensified. Public Utilities Department: 1. On 2019.1.23, work was not completed. Leakage occurred at the five-stage vent solenoid valve. The fluid is ammonia water. Leakage location: At the pneumatic valve stem. Current situation: The equipment is marked for maintenance; the equipment is old, and its packing has deteriorated. Slight leakage; maintenance is required to fix the issue. II. Equipment Maintenance Status: 1. Analysis of maintenance needs for mechanical equipment: Type of failure, Total count: Department 1, Department 2, Department 3, Department 4, Public Utilities Department, Department of Storage and Transportation. Bearing failures: 7, 1. Sealing failures: 7, 3, 1, 2, 2, 3. Coupling failures: 2, 4, 1. Valve failures: 2, 2, 2. Packing failures: 2, 1, 1, 1. Other failures: 12, 5, 1, 1, 4. Table 2-1 shows a summary of equipment failure types. Figure 2-1 presents a chart showing the distribution of equipment failure types. In January, 35 pieces of moving equipment, including air coolers and fans, were maintained or repaired. Among these, 32% of the failures were related to sealing leaks, 3% were bearing failures, 14% were coupling failures, 4% were valve failures, and 9% were packing failures ； The remaining 11% of failure types are mainly belt aging, wear ring corrosion, impeller failures, etc. 2. Maintenance analysis of electrical equipment: In January, a total of 6 electrical devices were repaired. The devices that required maintenance mainly included those in Operation Department 3; during the process of replacing the grease in the P1125 pipeline pumps, it was found that one of the bearings had a depressed spot, so the bearing was replaced ； In P4007 of the Storage and Transportation Department, the inner and outer rings of the fuel pump bearing, as well as its ball friction surfaces, were uneven, which caused abnormal noises; the bearing was replaced ； Operate the corrosion inhibitor pump V1122 to perform normal disassembly, inspection, maintenance, and bearing replacement ； A check was conducted on the air-cooled model A5006A during operation, and it was found that one of the bearings had a depression; after replacing the bearing, normal operation was restored ； Replace the bearing of fan F1201, which is making abnormal noises during operation in part of the distillation furnace ； The damage to the motor bearings mentioned above is due to normal wear and requires repair. All fall within the scope of normal maintenance. In the Storage and Transportation Department, the P5004 pump’s motor suffered damage due to poor contact at the power supply connection; the damage was located inside the motor, which is a quality issue with the motor itself. After the equipment was repaired by an external service provider, it functioned normally upon being returned to the factory for testing. 3. Maintenance analysis of instrumentation equipment: In January, a total of 12 pieces of equipment were disassembled, inspected, and repaired (excluding simple fault resolutions such as routine calibration), among which 5 repairs were carried out for leaks or failure to operate in control valves and solenoid valves ； Repair of 4 faults related to the malfunction of level and pressure transmitters ； 3 repairs for abnormal alarm faults. III. Spare parts consumption for maintenance: In January, a total of ------ 11 sets of machine seals were replaced during the maintenance of rotating equipment ； 2 sets of bearings: 7 ； 6 pistons ； 8 sets of fillers ； Air valves, 7 valve plates ； 3 belts ； Impeller, 2 pieces ； Mouth rings, 2 pieces ； Diaphragm, shock-absorbing ring, and five gaskets – 6 pieces in total ； 1 rolling shaft. Table 3-1: Statistics on the Use of Equipment Maintenance Parts
Department Using the Parts | Part Name | Equipment Location Code | Equipment Name | Specification Model | Quantity | Unit
Operating Unit 1 | Packing, Piston | Liquid Nitrogen Pump | 3 sets
Operating Unit 2 | Packing, Piston | P5002B High-Pressure Injection Pump | 3 sets
Operating Unit 3 | Packing | P1115A Electrodesalination Injection Pump | 2 sets
Operating Unit 1 | Mechanical Seal, Bearing | Water Station Pump M7N/50 | 1 set
Public Works Department | Mechanical Seal, Bearing, Impeller | Fire Pressure Stabilization Pump BIA/25 | 1 set
Operating Unit 1 | Mechanical Seal | Liquefied Gas Pump C8B/60 | 1 piece
Operating Unit 2 | Mechanical Seal | Regeneration Tower Return Pump C8B/45 | 1 piece
Operating Unit 3 | Mechanical Seal | Acid Water Pump 173/35 | 1 piece
Operating Unit 3 | Mechanical Seal | Pressure Reducing Pipeline Pump BIA/18 | 1 piece
Operating Unit 1 | Mechanical Seal 1202B | Return Pump C8B/60 | 1 piece
Operating Unit 4 | Mechanical Seal | New Hydrogen Compressor Screw Pump BIA/20 | 1 piece
Operating Unit 4 | Mechanical Seal P2119B | Return Pump DBM/55 | 1 piece
Public Works Department | Mechanical Seal P013B | Regulation Tank Lift Pump BIA/30 | 1 piece
Public Works Department | Mechanical Seal P032 | Feeding Room Pump BIA/16 (manufacturer) | 1 piece
Operating Unit 1 | Valve Disc C1102A | New Hydrogen Compressor | 1 piece
Operating Unit 1 | Air Valve C3001 | Analytical Gas Compressor | 4 pieces
Operating Unit 4 | Air Valve Disc | Vacuum Pump | 1 piece
Operating Unit 4 | Air Valve Disc P1202A | Compressor | 1 piece
Operating Unit 3 | Belt | Atmospheric Pressure Air Cooling Fan | 1 piece
Public Works Department | Belt | Roots Blower | 2 pieces
Public Works Department | Pump Body | West Boiler Denitration Pump | 1 unit
Public Works Department | Pump Body | East Boiler Denitration Pump | 1 unit
Operating Unit 2 | Mouth Ring, Impeller | P5011 Regeneration Tower Top Return Pump | 1 set
Operating Unit 3 | Mouth Ring, Diaphragm | Sodium Hydrosulfide Pump 4-110-8 | 1 set
Public Works Department | Crosspiece | Sludge Pump | 1 piece
Public Works Department | Crosspiece | East Boiler Heat Transfer Oil | 1 piece
Public Works Department | Shock Absorbing Ring | 40-Ton Boiler Blower | 1 piece
Public Works Department | Shock Absorbing Ring | No. 3 Circulation Water Pump | 1 piece
Public Works Department | Rolling Shaft | West Boiler Slag Remover | 1 piece
Maintenance (Electrical): In January, a total of ------ bearings were replaced for electrical equipment maintenance ； 2 contactors ； Circuit breaker: 1 piece ； Thermal protector: 1 piece ； 1 lamp tube. Table 3-2: Statistics on the Use of Spare Parts for Electrical Equipment Repair
Unit: Spare Part Name, Part Number, Model, Quantity, Manufacturer
Quality Inspection Department: Small-capacity contactor, Oil heating box LC1D/20A – 1 unit; manufacturer: Delta.
Power Department: Circuit breaker, Distribution box switch DZ47S32A – 1 unit; manufacturer: Delta.
Third Department: Light bulb, Atmospheric pressure device, ∅30W – 1 unit; manufacturer: Shenxun.
Third Department: Motor bearing P1125 C3/6204/2 – 1 unit; manufacturer: Harbin.
Storage and Transportation Department: Motor bearing P4007 C3/6312/1 – 1 unit; manufacturer: Harbin.
Operation Department 1: Motor bearing V1122C C3/6202/2 – 1 unit; manufacturer: Harbin.
Quality Inspection Department: Small-capacity contactor, Water heating box LC1D/20A – 1 unit; manufacturer: Delta.
Third Department: Thermal protector P1122 JR36-160 – 1 unit; manufacturer: Delta.
Second Department: Motor bearing A5006A C3/6308/1 – 1 unit; manufacturer: Harbin.
First Department: Motor bearing F1201 C3/6308/2 – 1 unit; manufacturer: Harbin.
Repairs (instruments): In January, a total of -------- spare parts were replaced for instrument equipment; 2 solenoid valves ； Level gauges, 3 pieces ； Alarm devices, 3 pieces ； 1 pressure transmitter ； 1 locator. Table 3-3: Statistics on the Use of Spare Parts for Instrumentation and Equipment
Application Device, Name and Specification Model of Consumed Spare Parts, Application Equipment, Specification Model of Consumed Spare Parts, Quantity Used, Unit
Unit 1: Solenoid Valve, Programmable Control Valve ASCO552 – 1 piece
Storage and Transportation Department: Single-flange level gauge for Tank 603, DN50 – 1 unit
Unit 1: Remote-transmission tube level gauge for Heat Fractionator, UQZ-P-4400-YB – 1 unit
Unit 3: Combustible gas alarm, LEL type – 1 unit
Public Works Department: Solenoid valve for Nitrogen generator, ASCO8551 – 1 piece
Unit 3: Combustible gas alarm, LEL type – 1 unit
Unit 4: Differential pressure transmitter – 1 unit
Unit 2: Combustible gas alarm, LEL type – 1 unit
Unit 2: Double-flange level gauge – 1 unit
Unit 1: Positioner for Vent Tank YT1000 – 1 unit