Stainless Manway and Flange Package for Process Tanks
The builder required matched stainless steel tank components including non-pressure round access manholes, pipe connection flanges, and threaded floating ball valves with specific surface finishes and material grades.
Customer Pain Points
- Vessel interiors required controlled surface roughness between Ra 0.4 um and 0.8 um to avoid product hang-up
- Gaskets needed specific material matching including silicon, EPDM, FPM, or NBR depending on media contact
- Piping connections required multiple flange configurations from welding neck to blind rated up to class 2500
- Shutoff ball valves needed reliable operation across temperatures from -20 C to 230 C under 1000 WOG rating
Manufacturing Process
- 1
Forming and rolling stainless steel round manhole bodies and covers in ss304 or ss316 grades
- 2
Polishing manhole contact surfaces to the specified Ra 0.4 um to 0.8 um brushed or mirror finish
- 3
Fitting manhole assemblies with specified silicon, EPDM, FPM, or NBR sealing gaskets and hand-wheels
- 4
Machining flanges across welding neck, blind, slip on, or threaded profiles with RF, FF, or RTJ facings
- 5
Machining and assembly of 1-piece floating ball valves with BSPP, BSPT, DIN, or NPT threaded ports
- 6
Packing flanges and valve assemblies into plywood cases, pallets, crates, or boxes for shipment
Client Background
A manufacturer building process tanks, fermenters, storage tanks, and distillation equipment. The client name and order details are not disclosed, so this study describes only the part specifications and manufacturing requirements.
Project Challenge
The builder required matched stainless steel tank components including non-pressure round access manholes, pipe connection flanges, and threaded floating ball valves with specific surface finishes and material grades.
Our Solution
NOWARUN coordinated the supply of SS304 and SS316 round manholes sized DN150 to DN800 with brushed or mirror polishing, paired with matching ANSI, DIN, ASME, or GOST flanges and threaded floating ball valves.
Supply Chain Coordination
All components including SS304 and SS316 tank manholes, forged flanges, and threaded ball valves were managed directly from Zhejiang to deliver a coordinated vessel package.
Quality Control
Manhole surface roughness was checked against the Ra 0.4 to 0.8 um requirement, flange dimensions verified against ANSI and DIN drawing standards, and ball valves inspected to API 598 or EN 12266.
Final Result
A complete stainless tank hardware package delivered to drawing specifications, covering non-pressure DN150 to DN800 access manholes, rated piping flanges, and 1000 WOG ball valves.
Customer Benefit
The tank builder consolidates procurement of polished vessel manholes, flanges, and isolation valves into a single verified stainless steel package built to drawing tolerances.
Products in This Study
Stainless Steel Round Manhole
Stainless steel round manholes provide access openings for non pressure process vessels, tanks and machinery. NOWARUN…
View specifications
Flange Stainless Steel
Stainless steel flanges connect industrial piping systems across nominal sizes from DN10 to DN800 and pressure…
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Ball Valve Stainless Steel
Stainless steel ball valves handle flow isolation for water, oil, gas, and base media in industrial piping systems.…
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