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Taixing Petroleum Machinery Co., Ltd.>>  Company News
  Center latch bottleneck drill pipe elevator design task book

1. Design by:
⑴. To participate in international competition, countries in the world to satisfy Center latch bottleneck drill pipe elevator demand, Center latch bottleneck drill pipe elevator design must perform API Spec 8 C (fourth edition). Taking into account the needs of domestic users, while using SY5041, and shown in brackets.
⑵. User requirements. Domestic oil participation in the international development of oil fields, as well as domestic oil demand their own development, according to a company asked me to API Spec 8 C specification design and production center latch drill pipe elevator.
2. Purpose and scope
Center latch bottleneck drill pipe elevator oil, natural gas, geological exploration department for special tools hanging string holding raised or lowered in drilling operations.
3. Product Structure Overview
Center latch bottleneck drill pipe elevator, mainly by the left and right body; tab page, the page axis card; hinge axis, shackle, torsion, stop ring and other components. Left and right body connected by a hinge shaft connected to the card via the card page and page axis torsion of the left main, left and right when the body is closed by a torsion spring action, automatic locking tab page, in order to ensure security, shackle through the torsion spring tight tight right body hook the hooking pin. When open, pull latch hook handle torsion spring rotation, disengage the lock hook hook lock, continue to pull, torsion spring rotation, so that the card body with the right page disengaged. Ring gear are fixed to the left and right body by bolts, to prevent the link from the elevator.
4. Design input:
4.1 Basic parameters
4.1.1Center latch bottleneck drill pipe elevator rated load selection API Spec 8 C 2.3 in 150t (1350KN), 250t (2250KN), 350t (3150KN)
4.1.2 The design of the Center latch bottleneck drill pipe elevator varieties and specifications, see Table 1
Table 1

1 2 3 4 5
Fitting symbol Drill sizes and forms Neck diameter DTZ (MAX) elevator aperture elevator identity
mm in mm in
NC26(2 3/8IF) 2 3/8 EU 65.09 2  9/16 67.47 2 DDZ 2 3/8EU
NC31(2 7/8IF) 2 7/8 EU 80.96 3 3/16 83.34 3 DDZ 2 7/8EU
NC38(3 1/2IF) 3 1/2 EU 98.43 3 7/8 100.81 3 DDZ 3 1/2EU
NC40(4IF) 4 IU 106.36 4 3/16 108.74 4 DDZ 4IU
NC46(4IF) 4 1/2 IU 119.06 4 11/16 121.44 4 DDZ 4 1/2IU
NC50(4 1/2IF) 5IEU 130.18 5 1/8 133.35 5 DDZ 5IEU
5 1/2FH 5 1/2 IEU 144.46 5 11/16 147.64 5 DDZ 51/2IEU

4.1.3 Center latch bottleneck drill pipe elevator pore size in line with 7.2 (a) The provisions of API Spec 8 C table, see Table 2.
Table 2

No. Model / Specifications
1 DDZ 2 3/8EU/150(67/1350)
2 DDZ 2 7/8EU/150(83/1350)
3 DDZ 3 1/2EU/150(101/1350)
4 DDZ 3 1/2EU/250(101/2250)
5 DDZ 4 1/2IU/250(121/2250)
6 DDZ 5IEU/250(133/2250)
7 DDZ 3 1/2EU/350(101/3150)
8 DDZ 4IU/350(109/3150)
9 DDZ 4 1/2IU/350(121/3150)
10 DDZ 5 IEU/350(133/3150)
11 DDZ 5 1/2IEU/350(148/3150)

4.1.4 elevator connecting the ear with a corresponding link connection size shall comply with the API Spce 8C Table 7.5 in the provisions detailed in Table 3
elevator connecting link under the ear and the ear connection size Table 3

elevator, link the maximum load range elevator connecting link under the ear and ear
Surface contact radius (mm)
Other connection dimensions (mm)
KN (US tonf) H1 min H2 man G1 max G2 min J1 min J2 max h1 min h2 max
909~1350 (101~150) 50.80 50.80 23.82 38.10 100 65 150 90
1359~2250 (151~250) 69.85 69.85 30.96 47.63 140 80 200 130
2259~3150 (251~350) 69.85 69.85 37.31 47.63 140 100 200 130

4.2 Technical Performance
4.2.1 elevator left and right body, card pages bearing steel castings, after the final heat treatment and mechanical properties should not be less than the requirements in Table 4.
Table 4

Material category Rm(MPA) Rp0.2(MPA) A(%) Z(% ) AKV  J(-20℃)
Bearing steel 860 690 15 35 42

4.2.2 hinge axis, cards page axis alloy structural steel sections, the mechanical properties of the final heat treatment shall not be less than the requirements in Table 5.
table 5

Material category Rm(MPA) Rp0.2(MPA) A(%) Z(% ) AKV  J(-20℃)
Section 980 835 12 40 42

4.2.3 elevator left and right body, the heat treatment after the final tab page for the quenching (quenching and tempering) hardness 300HB ~ 340HB, the hinge axis and the axis of the final tab page for the heat treatment of quenching and tempering, the hardness of 40HRC ~ 45HRC.
4.2.4 The maximum rated load is determined at room temperature, when the temperature dropped to -20 ℃ (4 ° F) when still valid. Recommend Center latch bottleneck drill pipe elevator left and right body and the card selection page US ASTM A487 / A487M pressure cast steel Crade 10 (NiCrMo), cards page axis and the hinge axis selection 40CrNiMo.
4.2.5 Center latch bottleneck drill pipe elevator left and right body and chemical composition tab page material shall comply with US ASTM A487 / A487M requirements in Crade 10, wherein S and P content of not more than 0.025%, and the hinge axis Cards page axis material shall meet the requirements of GB / T3077 stipulated.
4.2.6 Design of coping Center latch bottleneck drill pipe elevator structure using finite element analysis method, its strength check.
4.2.7 elevator left and right body and the card key parts diagram page should be drawn in high stress areas.
4.2.8 elevator left and right body and the tab page should be radiographed. Sampling:
⑴ cast early or pre-production, all parts must be inspected by an ultrasonic method or the ray method, until the test results are satisfactory production process determined.
⑵ normal process, each production batch draw a casting, the volume of testing performed.
⑶ appears as a casting failure, and then withdrawn from the batch two, the same test as both a member of any still fail, then deal with all the batch castings inspection, as both qualified, the rest of the batch casting qualified acceptance. The failure of the first casting is repaired or scrapped. Acceptance Criteria
Ray inspection acceptance criteria of its apparent acceptance of different wall thickness, based on ASTM E446, ASTM E186 or ASTM E280 standard contrast radiographs as needed. Licenses are not cracked in all cases, thermal and cast-matter (respectively et D, E and F types of defects). Other types of contrast radiography shown in all critical parts should comply with quality class 2, in compliance with the quality of non-critical parts of level 3.
4.2.9 respond to each elevator load test to verify The test apparatus shall simulate actual working conditions, and with the actual operation have the same bearing contact area applying the test load shall be equal to 1.5 times the rated load, and holding no less than 5 minutes.
Check the elevator should function after proof load test load test shall not be compromised. test 24 hours after the demolition inspection should bear the main burden of all the parts (left and right body and the card page) to conduct a comprehensive surface magnetic flaw detection, the results may not be less than GB / T9444 provisions of the Level 1 requirements. That maximum surface roughness Ra value of 6.3μm, without considering the maximum defect size of 1.5mm, nonlinear defect: the maximum length of 2mm, the maximum area of ​​10mm maximum frame length linear linear point defects and defects, should be consistent with the total length of the table. 6
Table 6

Steel Castings Thickness (mm) Linear (mm) Point linear (mm) Total length (mm)
δ≤16 2 4 6
16<δ≤50 3 6 9
δ>50 5 10 15

4.2.10 elevator required for design verification test. design verification test should be carried out independent of the design task laboratory. Product sampling test: test product at least three, should be rated on the lower end of the range and intermediate options. Test Procedure
a. elevator loaded to the rated load, you should check the elevator's design features after unloading, loading can not be compromised.
b. In the high stress area designer provisions paste strain gauge.
. C design proof load is calculated as follows:
Pt = 0.8 × Pmax × ns (but not less than 2Pmax)
Where: Ptt design verification test load (short tons)
Pmax rated load (short tons)
ns yield strength design safety factor,
Table 7

Load rating, st Design safety factor  ns
≤150 3.00
150<Pmax<500 3.00- 0.75*(Pmax-150) /350
≥500 2.25

d. have been carried out design verification tests elevator, with its strain gauges measured the critical permanent deformation of the contact zone in addition, shall not exceed 0.2%.
e. After the design verification tests elevator, demolition should check on whether the dimensions of each part yield phenomenon. design verification test device should simulate actual working conditions, the load test device may be the equivalent of A-level, the error is less than 2.5% of the calibrator for verification.
After design verification test, magnetic particle testing high stress area, meet the requirements of
4.2.11 In the high stress area is not defective welding, welding defects may have other areas, should be developed welding process, the welding process to be assessed, welding personnel must have qualifications.
4.3 Non-destructive testing, product testing, material testing and mechanical testing and welding personnel must obtain the appropriate qualifications.
4.4 elevator production and use of measurement tools must have passed the test of the product, and regular weekly check.
4.5 elevator non-machined surface first coated with iron red rust primer, then painted orange paint reconcile, product code and the trademark black painted finish. Processing coated anti-rust oil.
4.6 elevator use of wooden packaging.
4.7 Product identification and traceability.
4.7.1 elevator main parts should be guaranteed from raw material production to customer service the whole process of traceability requirements.
4.7.2 according to API specification of elevator production, shall be marked with the manufacturer's name or trademark, the maximum load rating, drill size and type, plus 8C identification, access elevator identified API license: license number, monogram, manufacturing date.
4.7.3 Packing boxes outside the logo: the product name, type, size, manufacturer's name, gross (or net), wooden box dimensions (length × width × height), API monogram and license number.
5. Comprehensive standardization requirements
5.1 Key criteria:
API Sec 8C (fourth edition) Drilling and Production Hoisting Equipment SY5041 elevator
ASTM A487 / A487M steel pressure
ASTM E 446 wall thickness of less than 51mm steel castings ray detection by comparison photos
ASTM E 186 wall thickness 51 ~ 114mm steel castings ray detection by comparison photos
ASTM E 280 wall thickness 114 ~ 305mm steel castings ray detection by comparison photos
GB / T3077 steel technical conditions
GB / T9444 steel castings magnetic particle testing and quality rating system
5.2 normalization factor to achieve more than 50%.
6. Work Plan
Technical design and development department to develop an implementation plan, design drawings and documents completed four months, one month trial, testing, field trials sent to two months.

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