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Petroleum and Natural Gas Industry Standard of the People's Republic of China SY/T 5023-94
Brake Pads for Oil Drilling Rigs
Published on April 6, 1994
China National Petroleum Corporation
Implemented on October 1, 1994
1 Subject Content and Scope of Application
Petroleum and Natural Gas Industry Standard of the People's Republic of China Brake Pads for Oil Drilling Rigs
SY/T 5023-94Www.bzxZ.net
Replaces SY5023-82
This standard specifies the classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of brake pads for oil drilling rigs (hereinafter referred to as brake pads).
This standard applies to asbestos-based brake pads and asbestos-free brake pads for oil and natural gas drilling equipment. 2 Reference standards
GB4424 Ordinary brass rod
GB5765 Determination of impact strength of friction materials JB3937 Test method for density of automobile brake lining 3 Terms
3.1 Friction coefficient (m)
Refers to the ratio of the average friction force (m) between the brake pad and the dual friction surface under specific test conditions to the normal pressure (m) acting on the brake pad.
3.2 Wear rate (k)
Refers to the ratio of the thickness △h (or weight wear AW) of the sample worn away under specific test conditions to the total friction work A (the product of the average friction force F and the friction distance S during the test process) K (or K). 3.3 Thermal friction coefficient
Refers to the friction coefficient of the sample at 250-300℃. 3.4 Normal temperature friction coefficient
Refers to the friction coefficient of the sample at 150℃4 Product Classification
4.1 Oil drilling rig brake pads are divided into two types: molded type (indicated by M) and braided type (indicated by B). 4.1.1 Molded brake pads (M) refer to brake pads with velvet fiber as the skeleton material: usually used for drilling rig brake pairs without water cooling devices.
4.1.2 Dead-end brake pads (Ms) refer to a special molded brake pad installed at the dead end of the brake band and used in conjunction with ordinary braided brake pads. 4.1.3 Braided brake pads (B) refer to brake pads with fiber-copper wire braided Brake blocks with skeleton structure are usually used for brake pairs of drilling rigs with water cooling devices.
4.2 Brake blocks have three specifications: four screw holes, hole screw holes and no screw holes (as shown in Figures 1, 2 and 3): their dimensions should comply with the provisions of Table 1 and Figures 1 to 3.
4.3 Model representation method:
Approved by China National Petroleum Corporation on April 6, 1994 and implemented on October 1, 1994
Brake block type
SY/ T 5023--94
Brake block series number, the first Arabic numeral brake block code for the maximum well depth of 1,000 meters drilled by various types of drilling rigs
203±0.54
Brake block with four screw holes
Brake block with six screw holes
Figure 3 Brake block without screw holes
SY/ T 5023-94
Extreme deviation
Basic size
os'0 +
Extreme deviation
Basic size
Limit deviation
Original size
00'1 =
Limit deviation
Basic size
Limit deviation
Basic size
Limit deviation
Basic size
Limit deviation
Basic size
o5's +
Limit deviation
Original size
4.4 Brake shoe fixing screws and screw hole plugs: 4.4.1 Brake shoe fixing screws shall comply with the provisions of Figure 4. SY/ T 5023-94
Figure 4 Brake shoe fixing screws
4.4.2 Brake shoe screw hole plugs shall comply with the provisions of Figure 5 and Table 2, 0
Screw hole plugs
5 Technical requirements
Block model
Applicable brake
ZS3~GM,
ZS2--B
ZS3～6-B
5.1 The surface should not have defects such as blistering, cracking, convexity and concaveness that affect the use and inclusions that damage the brake hub. 5.2 Moulded brake pads shall not have any missing pieces or edges larger than 3mm1 in width and 10mm in length, any cracks larger than 3mm in length and 0.3mm in width, any pits larger than 3mm in diameter and 1mm in depth, or any protrusions or peeling layers larger than 1mm in height and 3mm in diameter. 5.3 Braided brake pads shall not have any loose braid or missing braid. 5.4 The performance of brake pads shall comply with the requirements of Table 3. 5.5 The fixing screw can be made of H62 brass, and its mechanical properties should comply with the provisions of GB4424. 5.6 The material of the screw hole plug should be the same as that of the brake block: Brake block type
Braided type
Molded type
Dead end brake block
6 Test method
Friction coefficient at room temperature
0.42-8.13
0.45 t012
6.1 Friction test equipment and pair
6.1.1 The test should be carried out on a friction material testing machine, SY/T 502394
Hot friction coefficient
1.35~1.70
1.80~2.35
2.00± 0.30
Impact energy
J/ cm?
6.1.2 The material of the dual friction disc should be consistent with that of the brake hub. The hardness of the tempering is HB217～255.6.1.3 There shall be no visible pores and sand holes on the surface of the dual friction disc. Wear rate
× 10-mm/Nm
1/2 of the ordinary block
matched with it
6.1.4 The friction surface of the friction disc shall not have depressions (ring grooves) with a wear depth greater than 0.2mml: Before each test, the friction surface should be polished with emery cloth and rubbed with acetone to keep it smooth. 6.2 Test specimen and its preparation
6.2.1 The dimensions of the test specimen are shown in Figure 6;
Test specimen in Figure 6
6.2.2 The test specimen shall be cut from the middle of the sample; 6.2.3 Run-in the test specimen according to the provisions of 6.3 until there are no grinding wheel marks on the friction surface of the test specimen; 6.2.4 The friction direction of the test specimen shall be consistent with the actual friction direction of the brake pad. 6.3 Test conditions
6.3.1 The relative sliding linear velocity between the center of the test specimen and the mating disc is 10.25m/s. 6.3.2 The test specific pressure is 0.98MPag
6.3.3 The friction force is directly measured by a dynamometer (or XY function recorder). SY/T 5023--94
6.3.4 Press a silver sheet (8mm×8mm×0.6mm) welded with a nickel-chromium-nickel-aluminum thermocouple (wire diameter 0.3mm) on the friction surface of the friction disk with a pressure of 0.098~0.196N to measure the friction surface temperature. The silver sheet should be placed on the center line of the friction track of the sample at a distance of 150N from the rotation center.
6.3.5 The increase in the surface temperature of the friction disk should be achieved by the friction heat with the sample, and no external heat source should be used to force the temperature to rise. 6.4 Test steps and methods
6.4.1 Test preparation
Before each test, the test machine should be calibrated according to the requirements of the test machine manual, and then the sample to be ground flat should be installed on the clamping frame according to the requirements of 6.2.
6.4.2 First benchmark test
When the temperature on the friction surface of the sample and the friction disc is lower than 100℃: perform the first benchmark test according to the provisions of 6.3. When the temperature reaches 150℃: control water cooling to stabilize the temperature at 150℃, record the friction force (or friction coefficient) every 500 revolutions starting from 1000 revolutions, and stop the machine after the revolution reaches 3000 revolutions.
6.4.3 First decay test
When the temperature on the friction surface of the friction pair and the sample cools to 100℃, start the test according to the provisions of 6.3, naturally increase the temperature, and record the friction force (or friction coefficient) every 25℃ starting from 100℃, and stop the machine when the temperature rises to 300℃. Fill in the value recorded each time in the table in Appendix A (Supplement).
6.4.4 Wear test
6.4.4.1 After the sample has cooled to 50°C after the first recession test, measure the thickness of the sample (accurate to 0.01mm) and take the average value of the measurements at five points (four corners and the center point) of the sample. At the same time, measure the weight of the sample (accurate to 0.01g). Record it in the table in Appendix A (Supplement).
6.4.4.2 As before, install the samples in the positions where the first recession test was carried out and heat them up naturally. When the surface temperature of the dual disk is 200°C and the number of revolutions is 3000, measure the thickness and weight of the sample according to 6.4.4.1. 6.4.5 Second recession test
Carry out the second recession test at 100～300℃, the method is the same as 6.4.3, 6.4.6 Recovery test
Carry out the recovery test on the specimen after the wear test according to the requirements of 6.4.2. 6.4.7 Friction calculation
Where: F average friction force, N
P normal pressure, N.
a, friction coefficient at room temperature:
Where: (4—-average friction coefficient of the first benchmark test; average friction coefficient of the recovery test.
b. Thermal friction coefficient:
Where: the sum of
coefficients.
SY/ T 5023-94
In the first recession test and the second recession test, a total of six points were rubbed at 250℃, 275℃, and 300℃. Wear rate calculation:
Take the line diameter of 0.3m and the number of revolutions of 3000, then
K,=3.54× 10
K=3.54x10-4AW
Where: AH--the sum of the average linear wear of each sample, mm; the sum of the weight wear of the two samples, g
F--the average friction force in the wear test, N; 6.4.8 Record the test and calculation results.
Fill the above test and calculation results into Appendix A (Supplement). Inspection rules
(mm/Nm)
(g/Nm)
7.1 Products shall be inspected and qualified by the quality inspection department of the manufacturer before they can leave the factory. 7.2 The appearance inspection shall comply with the provisions of 5.1, 5.2, and 5.3. Each batch of brake blocks shall be fully inspected. For specific rules, refer to 5.1.7.3 of this standard. The dimensions of the inspection products shall comply with Table 1 7.4 Measure the impact energy in accordance with GB5765; measure the density in accordance with JB3937. It shall comply with the provisions of Table 3. 7.5 Inspect the friction and wear properties in accordance with the requirements of Chapter 5, which shall comply with the provisions of Table 3. (4)
7.6 The product sampling shall be in batches of 1000 pieces. If the number is less than 1000 pieces, it shall be counted as one batch. Each batch shall not contain less than 2 samples. If the sample fails the inspection, it shall be doubled for inspection. If it still fails, the batch of products shall be considered as defective. 8 Marking, packaging, transportation, storage
8.1 The non-working surface of the product shall have the manufacturer’s name, product The dead-end brake block should be marked with red marks on the free surface around the brake block.
8.2 The following marks should be on the packaging box:
Manufacturer name, product name, model, specification and production date, gross weight, net weight, etc. 8.3 The box should be accompanied by a product certificate and packing list. 8.4 Products are packed in a box of five pieces each, and each box should be of the same specification. Products without screw holes should be marked with "no screw holes" on the packing list. The packaging should be moisture-proof. The products should be stored in a dry and ventilated place during transportation and storage, and should not be exposed to the sun or rain.SY/ T 5023 94
Appendix A
Inspection Record Sheet (Format)
(Supplement)
SY/ T 5023—94
Additional Notes:
This standard is proposed and managed by the National Technical Committee for Standardization of Petroleum Drilling Equipment and Tools. This standard is drafted by the Mining Machinery Applied Tribology Research Laboratory of the University of Petroleum (East China). The main drafters of this standard are Zhai Yusheng, Zhou Leping and Xu Renquan. After the promulgation and implementation of this standard: SY5023—82 will be abolished.
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