Products / Membrane Housing
Stainless steel membrane housing supplier and manufacturer in China.
Shandong Ningchuan Water Treatment Equipment Co., Ltd. supplies and manufactures stainless steel membrane housings (membrane pressure vessels) for 4040 and 8040 reverse osmosis, nanofiltration and ultrafiltration elements. Housings are produced in our own workshop in Linyi, Shandong, and pressure-tested before every shipment.
A membrane housing holds the membrane element and keeps feed water on the correct side of the membrane under high pressure. Vessel quality matters: poor welds, an uneven inner surface or a mismatched O-ring groove lead to leaks, bypass and a shortened membrane life.
We build side-entry and end-entry vessels in SS304 and SS316L, for 1 to 6 elements, with victaulic clamp or side-port closure — matched to the standard 4-inch and 8-inch membrane elements used worldwide.
| Model sizes | 4040 (4") and 8040 (8"); 1–6 membrane elements per vessel |
|---|---|
| Housing material | SS304 / SS316L |
| Tube | Seamless stainless steel tube |
| Max. working pressure | 300 PSI (2.1 MPa); 600 / 1000 PSI on request |
| Max. working temperature | 90 °C |
| End closure | Side port / end port; stainless steel victaulic clamp coupling |
| Surface finish | Mechanical polish, 240 mesh, Ra < 0.8 µm |
| O-ring material | EPDM (NSF certified) / Viton |
| Adapter & end cap | SS304 / SS316L |
| Feed / brine port | 1.5"–3" (customisable) |
| Permeate port | 1" NPT / BSP female thread |
Specifications above are our standard range. Custom sizes, materials, ports and pressure ratings are available — please send your working conditions for a tailored offer.
Sizes and closure styles for every RO skid
4-inch vessel for small and medium RO systems, laboratory and light industrial pure-water lines.
8-inch vessel for large industrial and municipal RO plants; 1 to 6 elements per vessel.
Feed and brine connections on the side of the shell — easier piping and maintenance in compact skids.
Connections at the end cap — a classic, low-cost layout for standard RO racks.
Not sure which model fits your project? Send us your flow rate, liquid and filtration requirement — our engineers will recommend the right configuration, free of charge.
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Common questions from overseas buyers about stainless steel membrane housing supplier — click a question to expand.
We are a manufacturer with our own workshop in Linyi, Shandong, China. We produce stainless steel membrane housings, filter housings, bag filter housings and water tanks in-house and supply them factory-direct.
4040 refers to a 4-inch diameter, 40-inch long membrane element — used in small to medium RO systems. 8040 refers to an 8-inch diameter, 40-inch long element — used in large industrial plants. Each vessel can hold 1 to 6 elements; more elements per vessel means fewer connections and lower installation cost.
SS304 suits most municipal and industrial water and brackish-water RO. Choose SS316L for aggressive or high-chloride feeds such as seawater desalination, and for food, dairy and pharmaceutical duty, where better corrosion resistance and a smoother finish are required.
Our standard vessels are rated to 300 PSI (2.1 MPa) working pressure. For high-pressure seawater or special processes we build 600 PSI and 1000 PSI versions on request. Every vessel is pressure-tested before it leaves the factory.
Yes — head sealing assemblies, sealing plates, thrust rings, adapters, end caps, locking plates, permeate outlets and mounting clamps can all be supplied with the housing, so your assembly arrives complete.
We accept trial orders from 1 piece. Standard sizes ship in about 10–20 working days; custom lengths, ports and pressure ratings take 20–30 working days. Send us your element size, number of elements and feed-water data, and we will quote the right vessel.
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