SY/T 5020-1997 Tapered cylindrical threads for drilling pumps

SY/T 5020-1997 Tapered Thread for Drilling PumpsSY/T5020-1997 Standard download decompression password: www.bzxz.net

ICS 75.180.10
Registration number: 1107-1998
Petroleum and natural gas industry standard of the People's Republic of China SY/T 50201997
Tapered and straight thread used in slush pump
Tapered and straight thread used in slush pump1997-12-28 Issued
China National Petroleum Corporation
1998-06-01 Implementation
SY/T50201997
This standard is formulated with reference to the American Petroleum Institute standard API Spec 7K "Drilling Equipment Specification" 1994 1st edition Article 2.5 \ Mud Pump Parts" and the American National Standard ANSI B.1. API Spec 7K only has the outer dimensions, tooth profile dimensions and accuracy requirements of the thread. The mean diameter values ​​of the threads listed in this standard are determined according to the 2A/2B grade accuracy of ANSIB1.1, and the remaining dimensions are calculated and determined according to the requirements of API Spec 7K. The threads determined in this standard are completely consistent with the threads determined in API Spec 7K, so that they can meet the needs of international trade, technology and economic exchanges. As a basic thread standard, the original standard has deleted the contents that are not related to the accuracy of the thread itself, such as the coaxiality of the thread axis and the piston rod.
This standard is revised on the basis of the original standards SY5020-80 and SY5021-80. The original standard only had 8 types of threads, which have now been expanded to 20, and the dimensions and deviations of the original standards are in accordance with API Spe c7K and ANSIB1.1 have been revised. The mean diameter and tolerance of cylindrical threads in this standard are determined according to the 2A/2B level of ANSIB1.1. The thread profile of this standard is different from that of ANSIB1.1. The mean diameter of the tapered thread is determined by the mean diameter of the cylindrical thread so that the tapered and cylindrical parts can be connected to each other. From the date of entry into force, this standard will replace both SY5020--80 and SY5021-80. This standard is under the jurisdiction of the National Technical Committee for Standardization of Petroleum Drilling Equipment and Tools. The drafting unit of this standard: Baoji Petroleum Machinery Factory, the main drafters of this standard are Quan Dexiang, Pu Rongchun, Li Yi, Tian Yu, Fan Quan
Petroleum and Natural Gas Industry Standard of the People's Republic of China Tapered and straight thread μsed in slush pumpSY/ T 50201997
Replaces SY 5020-80
SY 5021-80
This standard specifies the thread type, size, tolerance and marking of tapered cylindrical threads for drilling pump piston rods, intermediate rods and crossheads. This standard is applicable to the connection threads of drilling and pumps. Other connections with similar structures can be used in the same way. 2 Symbols
B Length of internal or external tapered thread;
- Length of external cylindrical thread;
Length of internal cylindrical thread (thickness of lock nut); L
D-Major diameter of internal cylindrical thread| |tt||D——-Internal cylindrical thread pitch diameter;
Internal cylindrical thread minor diameter:
External cylindrical thread major diameter;
d2---External cylindrical thread pitch diameter;
External cylindrical thread minor diameter;
Pitch diameter of base surface of tapered thread;
Reference distance, distance from base surface to small end surface of external tapered thread-distance from base surface to large end surface of internal tapered thread, H original triangle height;
Tooth profile and structural dimensions
The cylindrical thread tooth profile and limit dimensions of tapered cylindrical thread shall comply with the provisions of Figure 1 and Table 1. 3.1
3.2The tapered thread tooth profile of tapered cylindrical thread shall comply with the provisions of Figure 2. 3.3The structural dimensions of tapered cylindrical thread shall comply with the provisions of Figure 3. Dimensions and tolerances
The dimensions of cylindrical thread of tapered cylindrical thread shall comply with the provisions of Table 1. The dimensions of the tapered thread of the tapered cylindrical thread shall comply with the provisions of Table 2. 4.2
4.3 Tolerance:
The limit dimensions of the pitch diameter of the cylindrical thread shall comply with the provisions of Table 1, 4.3,1
4.3.2 The limit deviation of the taper thread diameter is ±0.265mm. 4.3.3 The limit deviation of the taper thread diameter is 0.26s1m1m, and the limit deviation of the top diameter of the internal cylindrical thread is *+9.26smm. 4.3.4 The limit deviation of the reference distance L of the external tapered thread and the S value of the internal tapered thread are both ±1.6mm. Approved by China National Petroleum Corporation on December 28, 1997, implemented on June 1, 1998
External thread
SY/T5020.1997
Figure 1 Cylindrical thread profile and limit size
4.3.5 The limit deviation of the tooth side angle is ±1°4.3.6 The limit deviation of the pitch is ±0.056mm/25.4mm, and the cumulative deviation is ±0.112mm. The internal thread
4.3.7 The bottom diameter deviation is not specified, but it shall not exceed the maximum solid tooth profile determined by the basic deviation, that is, the general gauge tooth profile. The tooth bottom can be made into two types: parallel to the thread axis and the cone generatrix, and can also be made into an arc type with an arc radius less than 0.33mm. 4.3.8 The taper limit deviation is 2.50mm/304.8mm for internal taper thread and +.08mm/3048mm for external taper thread.
The taper thread marking consists of two parts: the taper thread number and the standard number. For example, the taper thread with a nominal size of 2in is marked as: T9SY/T5020. Note: The standard number in the thread marking can be omitted if it does not cause misunderstanding. E2
Medium diameter
3×45°
SY/ T 50201997
Internal thread
Parallel to the thread axis
Vertical thread drawing line
Parallel to the thread axis
Medium diameter
External thread
Figure 2 Conical thread profile
3×45°
Figure 3 Conical thread structure dimensions
Piston rod
Exposed nut
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