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Steel Tank Manways
Steel manways, covers and gaskets for storage tanks, made to order in Hutchinson, Kansas. Pick a size, see the price and order online. Sizing help and FAQs are below the products.
Price range: $507.58 through $2,881.64
Price range: $244.87 through $1,555.22
Price range: $30.25 through $98.21
Price range: $177.81 through $264.83
Steel tank manways for storage tanks, sold online with posted prices by SteelFront, the store of Wifco Steel Products in Hutchinson, Kansas. Build the round steel manway you need from 16″ to 36″ diameter, with a 4″, 7″ or 12″ neck, neck plate from 1/4″ to 1/2″, a 1/4″ to 3/4″ flange, and a single- or double-punched bolt pattern. Then add a matching bolted manway cover and a manway gasket in the same diameter. For low-profile cleanout access, pair the 24″ x 36″ opening cleanout frame with a 28″ x 40″ tank cleanout cover and a neoprene gasket roll.
Use the size and price chart below to compare diameters, or read the manway sizes guide before you order.
Manways, covers and gaskets that fit together
Every part in this category is made to match the others. Order the manway, cover and gasket in the same diameter, and the manway and cover in the same single- or double-punched pattern.
| Part | What it does | Sizes and options | Price range |
|---|---|---|---|
| Round storage tank manway | Neck and flange that weld into the tank shell or roof to frame the access opening | 16″, 18″, 20″, 24″, 30″, 36″ diameter; 4″, 7″, 12″ neck; 1/4″-1/2″ neck plate; 1/4″-3/4″ flange; single or double punched (864 combinations) | $507.58 – $2,881.64 |
| Round bolted manway cover | Blind plate that bolts to the manway flange | 16″-36″ diameter; 1/4″, 5/16″, 3/8″, 1/2″, 5/8″, 3/4″ thick; single or double punched | $244.87 – $1,555.22 |
| Fibreflex manway gasket | Seals between the manway flange and cover | 1/8″ thick; 16″-36″; double punched, fits single or double punched manways | $30.25 – $98.21 |
| Rectangular cleanout frame | Welded angle frame that sets a rectangular cleanout opening in the tank | 28″ x 40″ outside, 24″ x 36″ opening; 2″ x 3″ x 1/4″ angle; raw steel | $85.72 |
| Tank cleanout cover | Bolted cover for the cleanout frame | 28″ x 40″; 1/4″ or 3/8″ plate; holes matched to the frame; raw steel | $177.81 – $264.83 |
| Neoprene gasket roll | Gasket strip for the cleanout frame | 2″ wide x 100 ft | $106.04 |
Round manway size, weight and price chart
Prices and weights come from the posted options for each diameter. Pick the exact build in the selector to see its price.
| Diameter | Manway price | Manway weight (lb) | Cover, 1/4″ to 3/4″ (lb) | Gasket |
|---|---|---|---|---|
| 16″ | $624.28 – $1,080.98 | 23 – 116 | 23 – 70 | $30.25 |
| 18″ | $507.58 – $1,077.06 | 26 – 129 | 28 – 84 | $33.40 |
| 20″ | $569.90 – $1,319.22 | 28 – 142 | 33 – 99 | $44.28 |
| 24″ | $739.12 – $1,688.58 | 34 – 170 | 45 – 135 | $56.82 |
| 30″ | $1,131.78 – $2,319.86 | 43 – 217 | 68 – 203 | $86.93 |
| 36″ | $1,371.62 – $2,881.64 | 51 – 257 | 93 – 279 | $98.21 |
How to choose a tank manway
1. Diameter
Diameter is the clear opening a person or tool passes through. 24″ is the most common shell manway size for people entering a tank, and 20″ is common on roofs. 30″ and 36″ openings make room for a worker in a harness or for equipment to go in and out. 16″ and 18″ fit small tanks and inspection-only access. If your tank is built to a design standard, use the size the standard or your tank drawing calls for. See the manway sizes guide for API 650 reference sizes.
2. Neck length (projection)
The neck is the ring that welds into the tank and carries the flange out from the shell. A 4″ neck sits close to the tank. A 7″ neck leaves more room for a wrench behind the flange. A 12″ neck clears insulation, a stiffening ring or a nearby nozzle.
3. Neck and flange thickness
Match the neck plate to your shell plate and the design your fabricator or engineer is working to. A thicker flange stays flatter as the bolts are tightened, which helps the gasket seal on larger diameters. A 1/4″ flange keeps weight and cost down on small, low-head tanks. 1/2″ to 3/4″ flanges are the usual choice for 30″ and 36″ shell manways and taller tanks.
4. Bolt pattern: single or double punched
Choose the same pattern for the manway and the cover so the holes line up. The Fibreflex gasket is double punched, so one gasket fits either pattern.
5. Cover thickness
Covers come in 1/4″, 5/16″, 3/8″, 1/2″, 5/8″ and 3/4″ plate. Thicker covers hold their shape better on large diameters and under liquid head. On many builds the cover matches the flange thickness. Covers are sold separately.
Round manway or rectangular cleanout?
A round manway is the standard entry point on the side or roof of a tank. A rectangular cleanout sits at the bottom of the shell, so sludge, sand and paraffin can be shoveled or washed out. Our cleanout frame has a 24″ x 36″ opening.
Installation notes
- Cleanout frames and cleanout covers ship as raw (unfinished) steel, ready to weld, prime and coat with the tank.
- The manway neck is welded into a cut opening in the tank shell or roof. Weld size, reinforcement pads and testing follow your tank design. Use a qualified welder.
- Seat the gasket, bolt the cover evenly in a star pattern, and re-check bolt tightness after the first fill.
- Entering a tank through a manway is confined-space entry. Follow OSHA 29 CFR 1910.146 and your company’s entry permit process.
Where our manways are used
Steel tank fabricators, oilfield operators and plant maintenance crews order these parts for new tanks and for repairs. See the parts lists for oil and gas tank batteries, produced water and saltwater disposal, water and wastewater tanks, aboveground fuel tanks, farm tanks and tank fabricators. For lugs, saddles, heads and other tank hardware, browse all storage tank parts.
Need a hinged or davit manway, an oval or pressure-rated opening, or a size we do not list? Contact Wifco Steel Products, our parent company and manufacturer, about custom and engineered requests.
Frequently asked questions
What is a manway on a tank?
A manway is a bolted access opening on a storage tank or vessel, big enough for a person to climb through for inspection, cleaning or repair. It has a neck welded into the tank, a flange on the neck, a gasket and a removable cover bolted to the flange.
What is the difference between a manway and a manhole?
In tank work they mean the same thing: a person-sized access opening with a bolted cover. “Manhole” is the term used in API 650 and older specifications. “Manway” is the more common term among fabricators and parts suppliers. Read more in manway vs manhole vs thief hatch.
What size manway do I need?
For people entering a tank, 24″ is the most common shell size. 20″ is common on roofs. Use 30″ or 36″ when workers wear rescue harnesses or equipment has to pass through. Always follow the size on your tank design or the standard it is built to.
Is the cover included with the manway?
No. The round manway cover and the gasket are separate items. Order all three in the same diameter, and order the manway and cover in the same single- or double-punched pattern.
What gasket fits a SteelFront manway?
The 1/8″ Fibreflex manway gasket in the same diameter. It is double punched, so it fits single- and double-punched manways. The rectangular cleanout frame uses the 2″ wide neoprene gasket roll.
What is a cleanout on a storage tank?
A cleanout is a rectangular opening at the bottom of the tank shell, used to remove settled solids. SteelFront’s cleanout frame has a 24″ x 36″ opening and a 28″ x 40″ outside size, and it takes a bolted 1/4″ or 3/8″ cover.
Can I order a hinged or davit manway?
Not online. SteelFront sells bolted manways with separate covers. For hinged, davit-arm or other engineered manways, contact Wifco Steel Products, our parent company and manufacturer.
🖨️ Download Storage Tank Manways Guide (Vector PDF)
16" to 36" bolt circle diameters, cover thicknesses, collar heights, and gasket specifications.
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