This round tank manway is the neck and flange that frame a person-sized opening in a steel storage tank. The neck welds into the tank shell or roof. The flange takes a bolted manway cover and a manway gasket. You choose each dimension, the selector shows the price for that build, and it goes straight into your cart. You don’t have to wait on a quote.
Manway options
| Option | Choices | What it changes |
|---|---|---|
| Diameter | 16″, 18″, 20″, 24″, 30″, 36″ | Size of the access opening |
| Neck (listed as “Neck Width”) | 4″, 7″, 12″ | Neck length: how far the flange stands off the tank |
| Neck thickness | 1/4″, 5/16″, 3/8″, 1/2″ | Plate thickness of the neck ring |
| Flange thickness | 1/4″, 5/16″, 3/8″, 1/2″, 5/8″, 3/4″ | Stiffness of the bolting flange |
| Flange attachment holes | Single punched or double punched | Bolt pattern; match it to your cover |
6 diameters x 3 necks x 4 neck plates x 6 flanges x 2 hole patterns = 864 possible manways. Every one has a posted price.
Price and weight by diameter
| Diameter | Price range | Weight range (lb) | Matching gasket |
|---|---|---|---|
| 16″ | $624.28 – $1,080.98 | 23 – 116 | 16″ Fibreflex |
| 18″ | $507.58 – $1,077.06 | 26 – 129 | 18″ Fibreflex |
| 20″ | $569.90 – $1,319.22 | 28 – 142 | 20″ Fibreflex |
| 24″ | $739.12 – $1,688.58 | 34 – 170 | 24″ Fibreflex |
| 30″ | $1,131.78 – $2,319.86 | 43 – 217 | 30″ Fibreflex |
| 36″ | $1,371.62 – $2,881.64 | 51 – 257 | 36″ Fibreflex |
SteelFront manway flange dimensions
SteelFront manways are made from A36 steel. Covers match the flange outside diameter, and every flange and cover has 9/16″ bolt holes.
| Manway diameter | Flange and cover OD | Bolt circle | Bolt holes |
|---|---|---|---|
| 16″ | 20-1/2″ | 19″ | 9/16″ |
| 18″ | 22-1/2″ | 21″ | 9/16″ |
| 20″ | 24-1/2″ | 23″ | 9/16″ |
| 24″ | 28-1/2″ | 27″ | 9/16″ |
| 30″ | 35″ | 33″ | 9/16″ |
| 36″ | 41″ | 39″ | 9/16″ |
Bolt count depends on single or double punching. Match the cover to the manway’s punch pattern.
How to spec it
- Diameter: 24″ is the usual shell size for people entering a tank. Choose 30″ or 36″ for harnessed entry or equipment. Use 16″ to 20″ for small tanks or roofs. The manway sizes guide covers this in more detail.
- Neck: a 4″ neck sits close to the shell. A 7″ or 12″ neck clears insulation, stiffeners and wrench space behind the flange.
- Neck plate and flange: match them to the shell plate and the design your fabricator works to. Thicker flanges stay flat under bolt load on larger diameters.
- Bolt pattern: order the manway and cover in the same pattern, single or double punched.
Where it is used
New tank builds and manway replacements on oilfield production and tank battery tanks, produced water and SWD tanks, water storage tanks, aboveground fuel tanks and farm tanks. Tank fabricators use them on new builds.
Questions
Is the cover included?
No. Order the round manway cover in the same diameter and hole pattern, and the Fibreflex gasket in the same diameter.
Can I get a hinged, davit or pressure-rated manway?
Not from this listing. For custom and engineered requests, contact Wifco Steel Products, our parent company and manufacturer.
Does the tank manway come with a cover and gasket?
No. The manway cover and manway gasket are sold separately. Order both in the same diameter, and the cover in the same single- or double-punched pattern.
What size bolts does it take?
Every flange has 9/16″ bolt holes. The bolt circle runs from 19″ on a 16″ manway to 39″ on a 36″ manway (see the flange table above).
Browse the full Browse all steel tank manways, covers and gaskets category for cleanout frames, cleanout covers and gasket material.
Ordering and shipping
Every option above has a posted price, so you can order one part or a full set for a tank build without asking for a quote. Parts ship from Hutchinson, Kansas to addresses in the United States, and anything over 70 lb ships by freight. You can also choose free local pickup at our Hutchinson plant at checkout. Questions about fit or quantity? Call (800) 258-1392, Monday to Friday, 8am to 4pm CST.
