National Oilwell 18 3/4

Listing details

Equipment information

Listing ID

MR-WC-0013

Year

Not stated

Condition

Used

Location

India

Quantity

Not stated

Last reviewed

July 31, 2026

National Oilwell 18 3/4 is listed as a well-control unit. Advertised details include nominal bore / aperture: 18.75 inches; working pressure (max rated): 15,000 psi; type: Ram BOP (single or double ram). Request current unit information and a quote from Mission Relay.

Specifications

Nominal Bore / Aperture

18.75 inches

Working Pressure (Max Rated)

15,000 psi

Type

Ram BOP (single or double ram)

Ram Operator Styles

Commonly Ultralock II, Poslock, or standard manual-lock; booster operators may be used for shear/extra closing force

Cavity Body

Heavy alloy steel, heat treated; includes wear rings, replaceable components in high-wear areas

Doors / Bonnet

Boltless or bolted door types, depending on model; doors engineered for fast ram changes

Seals / Trim

High performance elastomer/composite sealing; internal trim H₂S rated; lip-type pistons and ram shaft seals with secondary seals in many models

Ports / Outlets

Side outlets for pressure relief or kill/control lines; port sizes depend on specific cavity and operator setup

Weight

Substantial – many units weigh tens of thousands of pounds, depending on whether it's double ram, type of operator, etc.

Height / Stack Dimensions

Large stack height; exact height depends on whether single or double ram assembly, type of operator, door design, etc.