Master Distributors of Oil Tools World Petroleum Supply, Inc.

Shaffer® LWS™ Ram BOP


World Petroleum Supply stocks National Oilwell Varco the top industry manufacturer RAM Blow Out Preventers (BOP).

Shaffer® LWS™ Blowout Preventer • BOP

The Shaffer manual lock Model LWS ram blowout preventer (LWS BOP) available at World Petroleum Supply, Inc. with two Texas locations. provides a rugged, reliable preventer that is easily serviced in the field. Special features include:

  • Doors that simplify ram changes
  • Door seals with special backing to prevent extrusion and pinching
  • Standard internal H2S trim
  • Wear rings between the piston and cylinder to increase seal life and to virtually eliminate cylinder bore wear
  • Polyurethane lip-type piston seals with lifetime lubrication
  • Lip-type ram shaft seals to hold the wellbore pressure and the opening hydraulic pressure
  • Secondary ram shaft seals to permit injection of plastic packing if the primary liptype seal ever fails
  • Some sizes provide booster cylinder capability for shearing pipe

The manual lock LWS BOP is available in single and double models. Contact World Petroleum Supply, Inc. Sales for special configurations. Shaffer supplies manual lock LWS BOPs in the sizes shown in the table titled "LWS BOP Available Sizes and Working Pressures" below. These BOPs are designed for drilling and workover service. They are hydraulically operated and can be manually locked by turning handwheels. The standard trim unit is LWS BOP.

Shaffer® LWS™ BOP Blowout Preventer Available Sizes and Working Pressures.

LWS Ram Blowout Preventers are suitable for internal H2S environments. Units can be manufactured for Arctic (to -75 ºF or -59 ºC) and full H2S environmental services. Standard units can be retrofitted for full environmental H2S service. Shaffer preventers are manufactured in accordance with the American Petroleum Institute (API) specification 6A (current edition) and the National Association of Corrosion Engineers (NACE) document NACE Standard MR 01 75". Shaffer preventers can also be manufactured in accordance with the API specification 16A.

Hydraulic pressure of 1,500 psi (103 bar) will close any model LWS ram BOP with its rated wellbore pressure of 10,000 psi (690 bar) or less.

The specifications and dimensions given are for manual lock LWS BOPs.

Shaffer® LWS™ BOP Blowout Preventer buy at Oilfield Distributor - World Petroleum Supply.

Safety Precautions

Exposure to the daily hazards of drilling can lead rig crews and service personnel to disregard or overlook hidden hazards. The safety precautions listed below should be observed at all times.

Equipment Repairs or Adjustments

Turn off the system power and bleed all pressure prior to making any repairs or adjustments that do not require system power.

Hydraulic Lines

Hydraulic lines carrying fluids at high pressures can inflict potentially fatal injuries if the pressure escapes. Protect hydraulic lines from cutting, scraping, pinching, or other physical damage. Always wear hard hats and safety glasses when working around hydraulic lines. Bleed the pressure from any hydraulic line prior to disconnecting any fittings. Respect the prescribed ASME code minimum bend radius for hydraulic lines. Bending around too short a radius can rupture the line.

Welding and Cutting

Do not weld or operate acetylene-cutting torches near unprotected electrical cable, flexible hose, or hose bundles. Weld spatter can seriously damage the hose or cable. Ensure no slag or spatter enters the hydraulic system.

Replacement Parts

Many of the BOP components, though apparently similar to commercial hardware, are manufactured to system design specifications. To avoid possible hazardous failures, use only exact replacement parts or assemblies ...Contact World Petroleum Supply for details on BOP best suited for your job.

View Packing Elements and Seal Kits from World Petroleum Supply.


World Petoleum Supply, Inc. stocks the top oilfield manufactures for the Rig Floor, Flow Control and Pressure Control products.