Texas International Oilfield Tools, Ltd. stocking distributor for Precision Die Technologies, offering a wide variety dies and inserts ready for immediate delivery.
View PDF Catalog of Dies & Inserts and the usages.
Precision Die Technologies
Precision Die Technologies inserts are machined, not cast, to provide the accuracy required for today's critical applications. Our dies are heat treated to provide maximum insert life. A variety of tooth patterns are available to securely grip the hardest strings of casing, tubing and drill-pipe.
Today's hostile well environments often use corrosion resistant alloy (CRA) tubulars that require special handling tools. PDT can provide you with Grit Face Inserts* that allow you to utilize your standard handling tools with CRA strings. The Grit Face coating prevents contamination and marking caused by standard inserts.
Texas International Oilfield Tools, LTD maintains a large inventory of tong and handling tool inserts for fast response 24/7/365. We are ready to respond to your needs for custom made dies and inserts for unique applications.
We guarantee you will be satisfied with Precision Die Technologies products!
Why Grit Faced Inserts?
Issues with Corrosion Resistant Alloy Tubular Goods
1. 1996 IADC/SPE Paper 36386
a. "Conventional spider & elevator inserts cause die marks than support corrosion. "
2. 1998 IADC/SPE Paper 47789
a. "Slips and Tongs produce permanent marks on pipe body & tool joints. Such marks develop high stress concentrations that reduces strength of pipe."
3. ISO13680 2000-07-01 Corrosion Resistant Alloy Seamless Tubes for use and casing, tubing & coupling stock
a. 8.6.1.3 Any imperfection on the outside or inside surface, of any orientation, shall be considered a defect if:
i. it is linear and deeper than 5% of the specified wall thickness or 0.3mm (0.12 inches), whichever is greater, in the radial direction;
ii. it is linear or non-linear and results in a remaining wall thickness of less than 87.5% of the specified wall thickness for hot finished productions and 90% for cold-worked products.
b. 15.2 The supplier's handling system shall be designed to avoid any type of damage to the tubes during transit. The use of hooks or similar lifting equipment in the ends of pipes, and for materials in Groups 2 to 4, contact with ferrous metallic materials shall be prohibited.
4. NACE International 2002 revision to RP0291-96
a. 10.1 "CRA materials are more susceptible to damage than carbon steel materials"
b. 10.2 "Ferrous contamination of CRA materials shall be avoided. Some CRA materials e.g. UNS S41000 are susceptible to pitting corrosion if exposed to ferrous (iron or carbon steel materials.) Pipe wrenches, pry pars, turning forks, chains, wire brushes, or other carbon steel tools or equipment shall not be used for handling, processing, or storing CRA materials."
5. 2002 IADC/SPE 77243
a. "Slippages of "SUPER" or "HYPER" Chrome alloys have been reported by field personnel. These slippages occurred with various inserts and with all types of slip-type elevators or spiders. An investigation carried out by the University of Hannover revealed that the surface scale on the pipe had a hardness of over 60 Rc."
b. Conventional heat-treated inserts for handling tools and tongs have a hardness range of 58 to 62 Rc.
6. API Specification 5CT, seventh edition October 21, 2001 and ISO11960:2001 April 1, 2002 define specifications for pipe used in oil & gas wells including L-80 13% Cr
a. 8.13 External defects in tubes cannot exceed maximum of 12.5% to 5% of wall thickness based on grade or maximum of 0.015 to 0.010 inches in critical areas of upset tubular goods
b. 9.14.5 External imperfections including grip marks on couplings cannot exceed depth maximum of 0.025 to 0.040 inches based on OD of tubulars
c. SR2 Supplemental Requirements for examination of grades H40, J55, K55, N80, L80, C95 and P110: imperfections greater than 5% of wall are defects requiring disposition in accordance with 10.15.16
GRIT FACED DIES and INSERTS
Superior Manufacturing & Hydraulics, and its sister company, Precision Die Technologies have adopted the standard being used by several premium pipe manufacturers that defines 4.5% of wall thickness as a maximum allowable surface indentation for normal tubular gripping applications. The greatest indention depth documented in testing to date is 3.54% with typical depths ranging from 1.45% to 2.9%.
The benefits of the Grit Face Coating for tong dies and handling tool inserts includes:
PROTECTS TUBULARS
- Minimal Marking
- Typical indention depth of 0.004 to 0.006 inches
- Indentions are typically less than ½ of API allowable surface defect depth
- Indentions are in a random scattered pattern
- Eliminates linear stress risers know to reduce fatigue life and pipe strength
- Gripping Surface is manufactured using exotic materials
- Precision manufacturing process provides uniform coated surface with optimal dimensional control
- Tungsten Carbide particles are graded for size and shape
Nickel Chrome brazing material applied in vacuum furnace
Prevents creation of pits containing iron or steel which can contaminate the surface of CRA tubulars causing rapid premature corrosion failures
PROVIDES INCREASED PERFORMANCE
- Gripping capacity is better than "non-marking" systems
- Tongs offer higher torque capabilities
- Handling tools do not require preloading
- High hardness of coating components (approx 92 HRA) grips "Super" and "Hyper" chrome alloys oxide coatings more effectively than carburized teeth (both are approx 62 HRC)
FIELD PROVEN
- Used to run most CRA tubulars in North Sea since 1997 now used worldwide
- Used on tubulars from 1.06" to 13 3/8"
- Heaviest string run to date weighs in excess of 250 tons
- Heaviest lab test to date 400 tons on 7"-35PPF 22% Cr 125ksi tubing
- Used with expandable tubulars
ECONOMIC
- Used with standard handling tools
- Over 155 Grit Faced Inserts are available for almost every handling tool and safety clamp
- Eliminates need for specially adapted equipment for CRA strings
- Increases utilization of handling tool inventory
- Field usage shows Grit Faced Dies and Inserts last longer than hardened steel dies and inserts used with high strength tubulars
- Decreases operation time, reduces operator fatigue and enhances safety of operations
- Does not require "sandpaper" to be replaced at each
connection - Operators are not reaching into tools at each connection
- Does not require "sandpaper" to be replaced at each
Gripping Mechanisms used in tongs, slips and elevators for oilfield tubulars including tubing, casing and drill pipe
Three basic mechanisms used are:
- Friction based non-penetrating gripping using smooth faced elastomeric, semi metallic or soft metal dies
- maximum load transfers are dependent upon applied radial loads and coefficient of friction
- radial loads maybe limited by tubular collapse resistance or elastomer extrusion resistance
- may require specialized tongs, slips or elevators
- Interference grip using dies with hardened gripping patterns embedding in softer tubes
- maximum load transfers are dependent upon applied radial loads, gripping pattern, depth of penetration, and shear strength of materials used in die and tubular
- die mark depths can be significant in softer tubulars at high loads leaving stress riser patterns
- initial "bite" on high strength tubulars can be difficult to achieve and require "preloading" conventional die materials can contaminate CRA tubulars resulting in aggressive corrosion failures
- No-go style handling tools and tongs limited upset tool joints, coupled connections or forged sucker rod connections limited by ultimate weight carrying capacity, shock loading, special considerations required for CRA tubular goods
* Trademark of Precision Die Technologies. Grit Face Dies and Inserts are covered by US Patent 6,755,097, foreign and pending patents.
