Stone(Sand) Trap

KASRAVAND is leading manufacturer, supplier and exporter of Sand (Stone) Trap:

Sand separators are an integral part in protecting downstream production equipment from well-formation sand and/or frac sand. KW International manufactures and remanufactures various sizes and pressure ratings of sand separators. From 6"O.D. to 40"I.D. L-Type or our low profile high volume spherical design... 2,000 psig - 10,000 psig. Our sand traps are designed for stationary applications and/or mounted on transportable L-shape type skids.

  • Design Conditions Required
  • Gas Flow Rate MMSCF / Day
  • Shut in Tubing Pressure
  • Oil Rate BBL / Day
  • Water Rate BBL / Day
  • Quantity of Sand / Day
  • Flowing Temperature
  • Specific Gravity
  • Sour Gas
  • CO2
  • Sand
  • Stone/afew times sodium

 How do your sand separators work?

Our sand traps operate vertically and use gravity, not centrifugal force, to separate sand from the flow. As the flow enters the sand trap, it is radically slowed and the direction changed 90 degrees by the stinger-diverter. This allows the sand to separate from the gas and liquids. Sand falls to the bottom of the trap and is kept there by a system of proprietary baffles. The baffles allow gas and liquids to move up and out while keeping the sand separate. Sand is removed by opening one of the two sand discharge ports during operation; shut-in is not required if one of the sand outs clogs.

What working pressures do you offer?

We offer sand separators in a variety of pressures ranging from 5800# psi to 10,000# psi working pressure. Our most common pressures are 5800# and 10,000# psi but we also offer 7500# psi desanders. Sand traps come in two basic configurations: mounted in an "L" skid, or mounted on a trailer.

An "L" skid allows for horizontal transport of the sand trap, then it can be stood up on the lower portion of the skid to operate vertically (all gravity sand traps operate vertically). Our sand traps are ASME coded and registered with the National Board.

Do you offer trailer mounted sand traps?

Yes, we offer a 5800 psi version of our sand separator mated to a heavy-duty dual-axle trailer. It features hydraulic lift/lower capability for fast and easy set up. This design allows one man using a pickup truck to pull, position, and rig up. Well-suited for fast-paced flowback and frac cleanup.

Do you offer sour service sand separators?

Most of our sand traps are NACE certified right out of fabrication and can be used for sweet or sour service. For instance, all our 5800# psi sand traps are NACE certified.

What size are the inlet and the gas out and sand discharges?

We offer a variety of connection types and sizes. Our standard size is 2" in/out but some models, most notably our 10K sand traps, use 3" in/out. Connections are available for all pressures in 1502 or RF flanged. The 5800# psi sand traps typically come in either 2" or 3" 1502 but can be ordered flanged as well. The 3" in/out 1502 connections offer greater thoughput and hence are called "High-flow" units. 10K sand traps come with 3" 1502 in/outs and 2" sand discharge and drain connections standard but ring type joint (RTJ) flanges can be ordered instead.

How easy is it to service your sand separators?

After each job, clean the sand trap by flushing it with air or clean water. There is a drain on the bottom of the sand trap when it is vertical, designed specially for this purpose.

Depending on use, remove and inspect the stinger-diverter assembly checking for wear and tear on the stinger plug. This plug is the main deflector that forces the inflowing stream downwards; it is critical to the proper operation of the trap. When re-assembling the stinger, be sure the stinger flow direction indicator bar is pointing straight down when the sand trap is in its vertical operational position.

Check your connections for any sand washing or damage to the gaskets inside the 1502 connections. Replace if needed. Other than that, and annually re-certifying the safety relief valve, there isn’t much needed to keep the sand trap operational for years.

How much gas can a 20" x 8' x 5800# sand trap clean per day?

Depending upon the amount of sand entrained in the natural gas stream and the average operating pressure, a 20" x 8' x 5800# psi sand separator typically cleans anywhere from 6mm to 10 MMSCFD gas. A high-flow unit can handle up to 12 MMSCFD gas.

What are other common names for sand traps and what type of sand can they handle?

Sand traps are also called de-sanders, desanders, sand separators and sand cans. Sand traps are designed to handle naturally occuring reservoir sand, frac sand, and grit that is left behind from drilling and fracking operations. There are two main types of sand traps: gravity and centrifugal. Kasravand Equipment specializes in high pressure gravity sand traps that range from 5800# psi to 10,000# psi (206 bar to 689 bar).

Should I put the sand separator before or after my choke manifold?

A choke manifold benefits when placed downstream of the sand trap since it is not exposed to the abrasive sand. However, there are times when it is necessary to place a choke manifold upstream of the sand trap. The most common reason is that the pressure at the wellhead is higher than the sand separator rating and must be reduced. Another reason is that the new well is producing mostly liquid and the manifold is used to shunt the liquid directly to holding tanks. As the flow from the well dries out, the manifold makes it easy to change the flow from tanks to sand trap, and from there, into the separator