News & Insights
Company news and practical notes on specifying pressure vessels, tanks and steel structures.
Wanlong named a 2026 Jiangxi Private Enterprise Social Responsibility Leader
Jiangxi Wanlong Industrial Co., Ltd. has been named one of the 2026 Jiangxi Private Enterprise Social Responsibility Leaders. The list was announced on 11 November 2026 at the press conference for the 2026 Jiangxi Top 100 Private Enterprises and Social Responsibility Report, according to Jiangxi Release and the Jiangxi Federation of Industry and Commerce. About the list The Social Responsibility Leaders list names 100 private companies from across Jiangxi Province. Wanlong is listed under Nanchang. The same press conference announced the 2026 Jiangxi Top 100 Private Enterprises, the Top 100 private manufacturers and the Top 20 private service companies, together with 15 outstanding social responsibility cases. Where it fits in our public record For buyers checking a supplier, the listing sits alongside the records already published on this site: Special equipment production licences for Class D fixed pressure vessels (TS2236612-2027) and GC2 industrial piping (TS3836019-2027) ISO 9001, ISO 14001 and ISO 45001 certificates, valid to 2028-06-17 AAA credit rating for public tendering and the EPEC A+ supplier credit rating Our working principle stays the same: service creates value, and quality comes from details. To see the licences and certificates, visit About Us; to discuss a project, contact our team. Source: announcement of the 2026 Jiangxi Top 100 Private Enterprises lists, Dajiang News, 11 November 2026 (in Chinese).
Hydrostatic testing of pressure vessels: what buyers should expect
In a hydrostatic test the finished vessel is filled with water, pressurized above its design pressure and held there while inspectors check it for leaks and deformation. At Wanlong the test pressure is 1.25 × design pressure and the hold time is 30 minutes. Water is used because it barely compresses: if a weld fails, the pressure drops at once without releasing much stored energy. Where the test sits in the build sequence The hydrostatic test comes near the end. In our sequence it follows welding, NDT, heat treatment where required, machining and final assembly, and it comes before surface treatment and painting. Testing before painting leaves the welds bare, so any seepage is visible. What happens during the test The vessel is filled with water and vented so that no air is trapped at high points. Pressure is raised in steps to the test pressure. The test pressure is held for the specified time: 30 minutes in our procedure. Inspectors check welds, nozzles, flanged joints and the shell for leaks and visible deformation. Pressure is released slowly, and the vessel is drained and dried. What buyers should agree in advance Test pressure and hold time: confirm them in the inspection and test plan against your design code. Witness point: if your inspector or a third party wants to witness the test, mark it as a hold point and agree the notice period. Water quality: stainless steel vessels are normally tested with low-chloride water. State any limit your specification sets. Test position: a tall vessel tested lying down carries the weight of the water differently from service. The design should cover this. Gauges: ask for calibrated gauges and their calibration records. What the report should show The hydrostatic test report records the vessel number, test pressure, hold time, test medium, gauge details, result and signatures. It goes into the data book with the NDT reports and material records. When water cannot be used Some vessels cannot be filled with water, for example where the supports or the process cannot tolerate it. The design may then call for a pneumatic or combined test. This needs more safety precautions and must be specified by the designer. How Wanlong handles it Every pressure vessel we build is hydrostatically tested at 1.25 × design pressure with a 30-minute hold, before blasting and painting. Welds are inspected first by RT, UT, MT and PT, with radiography in our own shielded RT room. The test report is part of the data book shipped with each vessel, alongside the certificate of conformity, quality certificate, MTRs, WPS/PQR records and NDT reports. Vessels are built under licence TS2236612-2027 for Class D fixed pressure vessels.
How to request an accurate quotation for a custom pressure vessel or tank
To get an accurate quotation, send ten items: product type, quantity, medium, design pressure, design temperature, material, design code, drawings or data sheet, destination port and required delivery date. With these, a fabricator can price the actual vessel or tank instead of guessing, and you can compare quotations from different suppliers like for like. What to send, and why each item matters Product type: pressure vessel, storage tank, heat exchanger, SF tank, steel structure or skid. It decides which licence and code apply. Quantity: one unit or a series. Repeat units share drawings, procedures and set-up. Medium: what the equipment holds, including corrosive, toxic or flammable components. It drives material choice and inspection extent. Design pressure: including vacuum if it applies. Pressure sets plate thickness and test pressure. Design temperature: both maximum and minimum. Low temperatures need low-temperature steels. Material: for example Q345R, 16MnDR, 304 or 316L, or ask the fabricator to propose one. Design code: the code the equipment must be built to, plus any project specifications. Drawings or data sheet: general arrangement, nozzle schedule, internals and supports. Destination port: it sets packing, marking and freight. Delivery date: the date you need the equipment at the port or on site. Details that often change the price Extent of NDT, and whether full radiography is required Post-weld heat treatment Third-party inspection and witness points Coating system, insulation or lining Accessories such as ladders, platforms, instruments and agitators Documents, translations and data book format If two quotations differ widely, check these items first. One supplier may have priced spot radiography and another full radiography, or one may have left out the coating. If you have no drawings yet Send a process data sheet with the duty, volume, pressure and temperature. For pressure vessels, drawings can then be prepared by a licensed design institute before fabrication. Until the design is fixed, treat the quotation as a budget price. How Wanlong handles it We fabricate pressure vessels to your design, or to drawings prepared by a licensed design institute. Our licence TS2236612-2027 covers Class D fixed pressure vessels, medium and low pressure, so the design pressure must be below 10 MPa. Storage tanks, SF double-wall tanks, steel structures and skids are quoted against your drawings or our standard ranges, such as SF-10 to SF-50. The enquiry form on this site asks for each of the ten items above. If something is missing, our engineers ask before they price.
What goes into a pressure vessel data book
A pressure vessel data book is the file of records that shows the vessel was made from the specified materials, welded to qualified procedures, inspected, tested and built to the approved drawings. It normally holds the certificate of conformity, the quality certificate, mill test reports, welding procedure records, NDT reports, the pressure test report, any heat-treatment chart, as-built drawings and the packing list. The documents and what each one shows Certificate of conformity States that the vessel was manufactured and inspected to the design and the applicable code. It identifies the vessel by its product number and is signed by the manufacturer. Quality certificate Summarises the key data: design conditions, materials of the main pressure parts, NDT results, heat treatment and pressure test. An inspector usually reads this first. Mill test reports Material test reports from the mill show the chemical composition and mechanical properties of each heat of plate, pipe and forging. They are matched to the parts by heat number, which is how material traceability is checked from incoming steel to the finished vessel. WPS and PQR records The welding procedure specification (WPS) sets out how each joint is welded. The procedure qualification record (PQR) shows that the procedure was tested and passed. Together they show that each weld was made by a qualified method. NDT reports Results of radiographic (RT), ultrasonic (UT), magnetic particle (MT) and penetrant (PT) testing, with the extent and acceptance level required by the design. Hydrostatic test report Records the test pressure, hold time, test medium and result, with the signatures of the people who carried out and inspected the test. Heat-treatment chart Where the design calls for post-weld heat treatment, the time-temperature chart shows that the specified cycle was followed. As-built drawings and packing list The as-built drawings show the vessel as delivered, including any approved changes. The packing list ties the shipment to the vessel, its loose parts and its documents. How to specify it List the required documents in the purchase order, not after delivery. Agree the inspection and test plan, with any witness points, before fabrication starts. State the language and format you need, and whether you want copies before shipment. Ask for an index so your inspector can check that nothing is missing. How Wanlong handles it Each pressure vessel we deliver comes with these documents: certificate of conformity, quality certificate, as-built drawings, MTRs, WPS/PQR welding records, NDT reports, hydrostatic test report, heat-treatment chart where applicable, and packing list. Incoming plate is checked against its mill test report before cutting. Radiography is done in our own RT room. Hydrostatic tests run at 1.25 × design pressure with a 30-minute hold. Vessels are built under licence TS2236612-2027 for Class D fixed pressure vessels.
Horizontal or vertical storage tank: how to choose for your site
Choose a vertical tank when you need a large volume on a small footprint and the tank can stand on a prepared foundation. Choose a horizontal tank when the volume is moderate, the tank should be built and tested in the workshop and shipped whole, height is limited, or the tank must be buried. Most decisions come down to volume, ground space, transport and how the tank will be operated. Volume and footprint A vertical tank grows upward, so it holds more per square metre of ground. Large tanks are almost always vertical, and beyond shipping size they are built on site. A horizontal tank spreads its volume along its length. It needs more ground for the same volume, but it stays low. Transport and build method Road transport limits the diameter and length of a shop-built tank. Horizontal tanks are usually sized to ship whole on their saddles, so welding, inspection and testing happen in the workshop and site work is short. Vertical tanks above shipping size are prefabricated as plates and erected on site, which needs a crew, cranes and a longer site programme. Foundations A vertical tank puts its full weight on a circular footprint and needs a designed ring wall or slab. A horizontal tank sits on two saddles, each with its own footing. Soil conditions often decide the foundation cost, so check them before you choose. Operation Draining: a vertical tank with a sloped or conical bottom drains to one point. A horizontal tank drains through a low nozzle and may be set with a slight slope. Level measurement: in a vertical tank the volume changes evenly with level. In a horizontal tank it does not, so the gauge needs a calibration table. Mixing: agitators and mixers are easier to fit in a vertical tank. Access: horizontal tanks are low, so manways, valves and instruments can be reached without tall platforms. Pressure and burial For pressure storage of moderate volumes, horizontal vessels with two heads are common because they are compact and tested in the workshop. For buried service, such as underground fuel tanks at stations, horizontal tanks are the norm. A quick checklist Required working volume and number of tanks Available ground area and height limits Transport route and size limits to site Medium, design pressure and design temperature Draining, mixing and cleaning needs Aboveground or buried installation How Wanlong handles it We build both. Horizontal tanks are completed in our workshop in Jinxian and shipped whole. Large vertical tanks are prefabricated there and erected on site; our references include a 10,000 m³ wax-oil tank. Shells are rolled on 3- and 4-roll benders from plate up to 70 mm, with wall thicknesses of 6 to 70 mm. Tanks built as pressure vessels fall under our Class D licence for −0.1 to below 10 MPa and are hydrostatically tested at 1.25 × design pressure with a 30-minute hold. Send the medium, volume and site limits, and we propose the arrangement.
What is an SF double-wall tank, and how does interstitial leak monitoring work?
An SF double-wall tank is an underground fuel tank built as a steel tank inside a fibreglass-reinforced plastic (FRP) tank. S stands for the steel inner tank and F for the FRP outer tank. The narrow gap between the two walls, the interstitial space, is monitored. If either wall is breached, the change shows up in that space and raises an alarm, while the other wall still holds the fuel. Two walls, two jobs The steel inner tank holds the fuel and gives the tank its strength. The FRP outer tank keeps soil and groundwater away from the steel, which protects it from external corrosion, and it is the second barrier if the inner tank leaks. That is why external corrosion protection is central to how these tanks are assessed. UL 1746, for example, is the standard for external corrosion protection systems for steel underground storage tanks. How interstitial monitoring works In normal service the interstitial space is closed and dry. A leak in the inner wall lets fuel into it. A leak in the outer wall lets groundwater in. A monitoring system watches for either change. Common approaches are: Liquid sensors: a sensor at the low point of the interstitial space detects fuel or water. Pressure or vacuum monitoring: the space is held at a set pressure or vacuum, and a breach in either wall makes the reading drift. Liquid-filled monitoring: the space is filled with a monitoring liquid, and a change in the level of its reservoir shows a breach. The station designer and the local authority choose the method. The tank must then be built with the connections that method needs. Why fuel stations use them A single-wall buried tank gives no direct warning of a leak. The first sign may be a stock loss or contaminated soil. A double-wall tank detects a breach in either wall while the fuel is still contained, and the check runs continuously without excavation. What to check when you specify one Nominal capacity, diameter and length against the pit and site layout The standard and certificates your authority requires The leak-monitoring method and its connections Manways, nozzles and, for several fuel grades, the number of compartments Groundwater level and burial depth, which affect anchoring and backfill How Wanlong builds SF tanks We build five standard sizes, SF-10 to SF-50, from 10 to 50 m³, with inside diameters of 2,400 to 2,800 mm. The inner tank is Q235B steel, 6 mm thick, welded by submerged-arc welding to qualified WPS/PQR. The outer tank is FRP, 6 mm thick, built up on our FRP spray lines. Tanks are manufactured to SH/T 3178. Our UL 1746 certificate is 20161115-MH61687, for jacketed underground tanks for flammable liquids, issued 2016. We supply SF tanks under framework agreements to a national fuel retailer's provincial station networks.
AAA credit rating for public tendering, valid to April 2029
Jiangxi Wanlong Industrial Co., Ltd. has been rated AAA for credit standing in the public tendering field. Certificate GJ2026XY2901013 is valid from April 2026 to April 2029. What the rating covers The rating is issued for use in public tendering and bidding. It assesses the company's credit standing. It does not certify any product, and it does not replace the licences that apply to pressure equipment, piping or construction work. Our credit records AAA credit rating, public tendering: certificate GJ2026XY2901013, April 2026 to April 2029. A+ supplier credit rating, Sinopec EPEC procurement platform: certificate 20240102063, three years from July 2024. Licences buyers ask for For an equipment order, a tender committee or an EPC procurement team will also check that the fabricator is licensed for the work. These are our current licences and certificates: Special equipment production licence TS2236612-2027: fixed pressure vessels, Class D (medium and low pressure), valid to 2027-08-27. Vessel design is outsourced. Special equipment production licence TS3836019-2027: GC2 industrial piping installation, valid to 2027-04-14. Construction qualification D236A02207: petrochemical engineering, building construction and mechanical and electrical general contracting, Grade 2, valid to 2030-02-14. ISO 9001, ISO 14001 and ISO 45001 certificates, valid to 2028-06-17. Explosion-proof equipment installation, maintenance and repair qualification PCEC-2024-BC004, valid to May 2027. UL 1746 certificate 20161115-MH61687, jacketed underground tanks for flammable liquids, issued 2016. What we supply From one 133,000 m² site in Jinxian, Nanchang, we fabricate pressure vessels, storage tanks, SF double-wall underground fuel tanks, steel structures and skid-mounted units. The plant has a 30,000 m² vessel workshop and an annual capacity of 50,000 t, with 180 staff, 45 of them engineers and technicians. For tenders that combine several packages, one bid can cover vessels, tanks and steel from the same plant. Each order ships with its data book: certificate of conformity, quality certificate, as-built drawings, mill test reports, WPS/PQR records, NDT reports, test reports and packing list. Our references include SF double-wall tanks supplied under framework agreements to a national fuel retailer, tank installation for a top chemical group's ethylene complex in Yantai, and leachate and wastewater tanks on eight projects for an environmental EPC contractor. Copies of the rating certificate and our licences can be sent with tender documents.
ISO 9001, ISO 14001 and ISO 45001 certificates renewed to 2028
Jiangxi Wanlong Industrial Co., Ltd. has renewed its three management system certificates. ISO 9001 for quality management, ISO 14001 for environmental management and ISO 45001 for occupational health and safety are now valid from 18 June 2025 to 17 June 2028. Registration numbers ISO 9001 (quality management): 01725Q10433R2M ISO 14001 (environmental management): 01725E20277R2M ISO 45001 (occupational health and safety): 01725S10249R2M All three certificates run from 2025-06-18 to 2028-06-17. What the certificates cover The ISO 9001 scope lists the work buyers most often send us: Fabrication of steel structures and space frames Manufacture of Class D (medium- and low-pressure) fixed pressure vessels Production of SF double-wall underground fuel tanks Production of skid-mounted units Installation of GC2 industrial piping Construction work under our Grade 2 qualifications for building construction, building decoration and mechanical and electrical work The ISO 14001 and ISO 45001 scopes cover the same activities and add petrochemical engineering construction and foundation work, both at Grade 2. How to use the scope when you evaluate us A certificate number on its own does not show whether the system applies to your order. Check that the product on your purchase order appears in the scope. Then check that it is also covered by the matching licence: Pressure vessels: special equipment production licence TS2236612-2027, fixed pressure vessels, Class D, valid to 2027-08-27. The licence notes that vessel design is outsourced. GC2 industrial piping: licence TS3836019-2027, valid to 2027-04-14. Construction: qualification D236A02207 for petrochemical engineering, building construction and mechanical and electrical general contracting, Grade 2, valid to 2030-02-14. What stays the same on your order The renewal does not change how equipment is built. Plate is checked against mill test reports before cutting. Welding follows qualified WPS/PQR. Welds are inspected by RT, UT, MT and PT, with radiography in our own RT room. Pressure vessels are hydrostatically tested at 1.25 × design pressure with a 30-minute hold. Each shipment leaves with its data book. The certificates apply to our single site at No. 2666 Jinxian Avenue, Jinxian Economic Development Zone, Nanchang, Jiangxi. The site covers 133,000 m², with a 30,000 m² vessel workshop, an annual capacity of 50,000 t and 180 staff, 45 of them engineers and technicians. Copies of the three certificates can be sent with any quotation.
A+ supplier credit rating on the Sinopec EPEC procurement platform
Jiangxi Wanlong Industrial Co., Ltd. has been rated A+ in the legal-entity credit evaluation of the Sinopec EPEC procurement platform. The certificate number is 20240102063. It is valid for three years from July 2024. What the rating is EPEC is the Sinopec procurement platform. Its legal-entity credit evaluation rates a supplier's credit standing as a company. It is a credit rating, not a product approval: it does not replace the licences and test records that apply to each piece of equipment. The certificate can be checked on the EPEC platform by its number. Why it matters to buyers Before inviting a fabricator to quote, procurement teams on energy and petrochemical projects usually check two things: whether the company is sound, and whether it is licensed for the equipment. The A+ rating speaks to the first question. Our licences answer the second. Licences and certificates held in July 2024 Pressure vessels: special equipment production licence TS2236612-2027, fixed pressure vessels, Class D (medium and low pressure), valid from 2023-08-28 to 2027-08-27. Pressure piping: special equipment production licence TS3836019-2027 for GC2 industrial piping installation, valid from 2023-04-15 to 2027-04-14. SF double-wall tanks: UL 1746 certificate 20161115-MH61687, jacketed underground tanks for flammable liquids, issued 2016. Explosion-proof equipment: installation, maintenance and repair qualification PCEC-2024-BC004 for Ex vapour-recovery units and instruments, issued May 2024. The plant behind the rating Wanlong was established in 2003 in Jinxian, Nanchang, Jiangxi. The site covers 133,000 m², with a 30,000 m² vessel workshop and an annual capacity of 50,000 t. Of 180 staff, 45 are engineers and technicians. From this one site we fabricate pressure vessels, storage tanks, SF double-wall underground fuel tanks, steel structures and skid-mounted units. Plate is cut on CNC laser, flame and plasma machines, rolled on 3- and 4-roll benders up to 70 mm, and welded by SAW and GMAW to qualified WPS/PQR. Welds are inspected by RT, UT, MT and PT, with radiography in our own RT room. Our energy and petrochemical references include SF double-wall tanks supplied under framework agreements to a national fuel retailer, and tank installation for a top chemical group's ethylene complex in Yantai. A copy of the EPEC certificate can be sent with any quotation.
Send us the data sheet.
Tell us the medium, design pressure, temperature and quantity. An engineer replies with questions or a quotation.
- Sales contact
- Mr. Yu Jiakang
- WhatsApp / WeChat
- +86 183 1791 9067
- Factory
- No. 2666 Jinxian Avenue, High-tech Industrial Park, Jinxian Economic Development Zone, Nanchang, Jiangxi, China 331700
Pressure vessels, storage tanks, SF double-wall tanks, steel structures and skid-mounted units, fabricated in Jinxian, Jiangxi since 2003.
Jiangxi Wanlong Industrial Co., Ltd.
No. 2666 Jinxian Avenue, High-tech Industrial Park, Jinxian Economic Development Zone, Nanchang, Jiangxi, China 331700
Contact
- Mr. Yu Jiakang
- WhatsApp +86 183 1791 9067
- jiakang@wanlongindustrial.com
