Rotary Table Slips: Drill Pipe, Casing, Drill Collar & Rotary Applications

RIGRS Rotary Table Slips

RIGRS supplies rotary table slips for drill pipe, casing, and drill collar handling. Available configurations include SDS, SDML, SDXL, B-type drill pipe slips, CMS and UC-3 casing slips, and DCS, WT and A-type drill collar slips. Selection should be based on tubular OD, string load, slip body configuration, and compatibility with the existing rotary bowl or bushing.

Each slip assembly is manufactured from heat-treated alloy steel castings and precision-machined to strict dimensional tolerances to help maintain even radial gripping under high hook loads.

1. What to Check Before Ordering Rotary Slips

A slip body may fit into the rotary bowl while the dies do not properly match the tubular OD. A casing slip may cover the required pipe size but use the wrong bowl configuration. Replacement slip dies may fit the inserts or pockets but fail to make uniform contact with the pipe.

These small specification mismatches can quickly become major rig floor problems.

Whether you are outfitting a new drilling rig, performing routine maintenance, or replacing worn handling tools, we can supply complete slip assemblies as well as replacement segments, handles, liners, inserts, and slip dies.

2. Rotary Slip Selection and Quotation Process

To request a quote, provide the tubular type, outside diameter, rotary table or rotary bowl size, existing slip model, and required quantity.

Email: info@rigrs.com

WhatsApp: +8618615995257

If the current model is unknown, send photos of the slip body, slip dies, and nameplate, together with the tubular OD. Our team will verify the correct configuration before issuing a quotation.

Selecting the Right Slip Assembly

Slip selection should be based on load, not pipe size alone. The key value is the actual string weight in air at the slip-setting point, rather than the nominal load rating shown on a tubular specification sheet. For long, heavy strings operating close to the rating capacity of the slips, an adequate safety margin should always be maintained instead of selecting a slip assembly that only meets the calculating load on paper.

Once the load requirement has been establishing, select the correct slip inserts or liners for the tubulars being handlign. For rigs working primarily with standard drill pipe, the selection process is relatively straightforward. Operations involving mixed tubular strings, premium-thread casing, or coated tubing require more careful planning. In these cases, it is often better to keep multiple insert or liner sets for different tubular sizes and surface conditions rather than relying on a so-called “universal” insert for convenience.

Finally, always verify bowl compatibility with the existing master bushing before placing an order. The taper angle of the slips must match the taper of the rotary bowl. If the bowl taper is incorrect, the slips will not seat properly even if their load rating and tubular size range are otherwise correct.

Fit-up should therefore be confirmed before shipment, particularly when replacing an existing slip assembly. Catalog size ranges alone may not provide enough information to confirm compatibility with the existing bowl or bushing.

Drill Pipe, Casing, Drill Collar & Rotary Slips — Not Interchangeable

1. Drill Pipe Slips (SD, B and XL Types):

Designed for light-duty, medium-duty, and deep-well drilling operations.

The three-segment hinging design allows the slips to center automatically around the drill pipe body.

Available in Short (SDS), Medium-Length (SDML), and Extra-Long (SDXL) configurations to handle a wide range of load requirements, from shallow workover operations to ultra-deep drilling applications with string loads exceeding 500 tons.

Drill pipe slips are among the most frequently cycling handling tools on most drilling rigs for one simple reason: drill pipe is constantly being run in and pulled out of the hole. For drill pipe slips, rated load capacity should be checking together with the applicable pipe size range. Capacity also depends on factors such as slip length, die engagement, and taper geometry.

Even when two slip assemblies are listing with the same nominal capacity, their actual load-handling performance can vary more than procurement teams may expect. This is because rated capacity depends not only on the steel grade of the slip body, but also on the engagement length of the slip dies and the taper angle.

If the die geometry is different, two slip sets with the same nominal tonnage rating may perform very differently under the same drill string load.

Always verify the rated capacity against the actual drill string weight in air, rather than selecting slips based only on tubular outside diameter.

SDS — Short Drill Pipe Slips

SDS slips are typically used where a shorter gripping length is sufficient. Depending on the slip body size, they generally cover drill pipe ODs from 2-3/8 in. to 4-1/2 in.

SDML — Medium-Length Rotary Slips

Compared with SDS slips, SDML slips provide a longer gripping surface and cover a broader range of drill pipe sizes.

SDXL — Extra-Long Drill Pipe Slips

For applications requiring greater gripping length, SDXL slips provide a larger contact area between the slip dies and the pipe body.

Drill Pipe Slip Size and Weight Table

Drill Pipe Slips Type B

2. Casing Slips (Types CMS and UC-3)

Built to hold large-diameter casing strings (6-5/8″ up to 30″) without causing bottlenecking or wall crushing.

Features an extended contact area that distributes axial load evenly across the casing circumference.

Easily adjustable by adding or removing segment links to accommodate different casing sizes on the fly.

Casing slips carry a different problem entirely. The casing walls are thinner relative to their OD than drill pipe, and casing grades vary widely in yield strength — a slip that grips drill pipe safely can collapse or crush thin-wall casing if it’s used off-label. Casing slips are built with a longer, more distributed gripping surface specifically to spread the load over a larger contact area and avoid concentrated point loading on the pipe wall. If your casing program runs multiple wall thicknesses, don’t assume one slip set covers all of them — check the manufacturer’s rated range against your thinnest wall casing, not your average.

Casing Slips Type CMS

RIGRS Casing Slips Type UC-3

3. Drill Collar Slips (Types DCS ,WT and A):

Engineered specifically for stiff, non-magnetic, or heavy carbon drill collars.

Incorporates a multi-segment articulated structure with individual insert dies to accommodate small outer-diameter variances along the collar length.

Equipped with safety flex handles to reduce manual strain on floor crews during makeup and breakout.

Most drill collar handling goes through elevators rather than slips, because collars are typically run in shorter joints and handling differently in the BHA. Where drill collar slips do get using — setting back non-rotating BHA components, or on rigs running specific handling procedures — the grip requirement is different again, since drill collar walls are thick and solid rather than thin and pressure-rated, so the concern shifts from crushing the pipe to simply achieving adequate bite on a larger, heavier-walled section.

Drill Collar Slips Type DCS

RIGRS Drill Collar Slips Type WT

Drill Collar Slips Type A

4. Rotary Table Slips and Tubular Handling Slips

Rotary table slips are used to suspend tubular strings in the rotary table during tripping, connection, and other rig-floor operations. Different slip designs are selected according to tubular type, outside diameter, load capacity, and bowl or bushing configuration.

Flake Rotary Slips Type W

Why Slip Body and Bowl Compatibility Matters

A rotary slip is a tapered load-transfer device.

When the tubular load is applied, the slip moves downward in the bowl. The tapered relationship between slip body and bowl creates the radial gripping force that holds the pipe.

For this reason, a slip that is approximately the right diameter but does not match the intended bowl is not an acceptable substitute.

Engineering Metallurgy & Replacement Slip Dies

The reliability of a rotary slip depends on material grain structure and wear resistance at the gripping interface.

1. High-Toughness Segment Bodies

Slip segments are cast from high-strength low-alloy (HSLA) steel, following by quenching and tempering to prevent brittle fracture under high impact or extreme cold-weather operations. The outer taper matches standard API bowl angles (4″/ ft taper) for smooth seating and instantaneous release upon pull-up.

2. Precision Slip Dies & Insert Replacement

To prevent pipe scoring and ensure a firm bite on high-grade steel (up to Grade S-135) or chrome tubulars, we supply hardened replacement dies:

Standard Tooth Dies: Case-carburized carbon steel with a high surface hardness (≥ 60 HRC) and tough core to resist tooth shearing.

Non-Marking / Insert Dies: Engineered with specialized fine-tooth profiles or aluminum-bronze matrix options to hold sensitive 13Cr completion tubing without creating localized stress risers.

Factory Quality Control and Certification

The slip body is cast rather than forging, for the same reason forging is commonly preferring for drill collars and tool joints: cast steel provides more consistent performance under the repeating impact loading that occurs when slips are set and loading during tubular handling operations.

Slip die hardness and slip body hardness are controlling separately because the two components have different failure modes. The slip body requires sufficient toughness to resist cracking under load, while the slip dies require high surface hardness for wear resistance without becoming excessively brittle. A qualified supplier’s inspection process should reflect this difference by applying dimensional and load verification to the slip body and separate hardness verification to the slip dies, rather than covering both components under a single general quality statement.

RIGRS Factory Quality Control

When evaluating a supplier, request material certificates for the slip bodies with traceability back to the heat number, and confirm that slip die hardness testing is performing separately. If a quotation only identifies the body material but does not specify the slip die material or hardness requirements, it leaves out one of the components most likely to cause problems on the rig floor.

The main load path runs through the tapered slip body, segment joints, hinge areas, and slip die pockets. These areas should be including in the applicable dimensional and NDT inspection procedures.

To meet oilfield safety and quality requirements, all RIGRS rotary slips undergo strict inspection and verification before packing:

Magnetic Particle Inspection (MPI): 100% surface inspection of all load-bearing hinges, ears, and slip body segments to detect surface cracks or other relevant defects.

Proof Load Testing: Randomly selected samples are subjecting to hydraulic tensile load testing in accordance with applicable requirements of API Spec 7K and API Spec 8C.

Traceability and Documentation: Each production batch can be supplied with complete EN 10204 3.1 Material Test Reports (MTRs) and Certificates of Conformity (COCs).

How to Select the Correct Rotary Slip

A buyer normally does not need a long technical questionnaire. Four pieces of information identify most standard requests.

For Drill Pipe

Tell us the drill pipe OD and whether the existing slip is SDS, SDML or SDXL.

For Drill Collar

Provide the exact drill collar OD.

Because DCS slips use different segment arrangements across their range, the actual OD should always appear on the purchase order.

For Casing

Send the casing program or individual casing OD together with the bowl/bushing arrangement.

For Replacement Inserts

Send the insert code where available.

A photograph beside a ruler or caliper is useful when the original part number has worn away.

RIGRS Rotary Table Slips – FAQ

Q1: What drill collar sizes can DCS slips handle?

A: DCS-S, DCS-R and DCS-L configurations together cover approximately 3″ through 14″ drill collar OD.

Q2: What casing sizes can CMS slips handle?

A: CMS casing slip configurations are available from approximately 4-1/2″ through 30″ casing OD, using the corresponding bowl or bushing arrangement.

Q3: Can I purchase slip inserts without buying the complete slip?

A: Yes. RIGRS supplies replacement inserts and slip dies separately. Send the slip model, pipe size and insert part number where available.

Q4: Can RIGRS manufacture an obsolete slip insert from a sample?

A: Custom replacement inserts can be reviewed against a drawing or physical sample. Dimensions, material, tooth profile and application must be confirmed before production.

Q5: Can the same slip body be using with different insert types?

A: Yes, where the slip body is designing for replaceable inserts. Compatibility depends on the slip model, insert carrier, and tubular size.

Request a Quote for Rotary Table Slips

Send us your pipe or casing OD range, string weight in air, and connection type (standard or premium), and we’ll confirm the correct slip body, insert type, and bowl taper for your rotary table — or flag if your existing master bushing needs to be part of the conversation before we quote.

Email: info@rigrs.com

WhatsApp: +8618615995257