GB/T 593-2019 in English
VALIDMarine packed cocks
- Issued on:2019-08-30
- Implemented on:2020-03-01
- File Format:PDF
- Delivery:Via email within 5 business days
$301.00
| Standard No: | GB/T 593-2019 |
| Document status: | VALID |
| Title in English: | Marine packed cocks |
| Title in Chinese: | 船用填料旋塞 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2019-08-30 |
| Implemented on: | 2020-03-01 |
| Superseding: |
GB 598-1980 Marine bronze external screwed packed cocks
GB/T 593-1993 Marine bronze and cast iron flanged cocks GB/T 599-1996 Marine bronze external screwed draw-off cocks |
| ICS Classification: | 47.020.30-Piping systems |
| Chinese Classification: | U53-Marine gate valves and plug cocks |
| Professional Classification: | GB-National Standard |
| Related Keywords: | cocks introduction standard evolution
old standard parts old standard fts6020n1 stainless steel plug standard implementation q |
| Related Topics: | filler
stuffed Nickel filler granular filler for boats Packing factor The role of filler Filling effect GBT593 GBT593-1993 GB/T 593-2019 |
Introduction
Standard Evolution and Technological Breakthroughs
GB/T593-2019 integrates the three old versions of the standards 1993/1980/1996. The main technical upgrades include: addition of stainless steel materials (ZG07Cr20Ni10, etc.), optimization of cast iron wall thickness parameters (Table 4/5 is 0.5-1mm thicker than the old standard), and expansion of the size range of threaded joints (Table 8 adds M48×2 specifications). The standard now covers two categories and seven types of FA/FL/FT type flanged plugs and TA/TB/TC type threaded plugs.
Comparison analysis of core parameters
| Type | Material | Maximum pressure (MPa) | Temperature range (℃) | Anti-corrosion performance |
|---|---|---|---|---|
| Bronze plug | ZCuSn10Zn2 | 2.5 | -20~200 | Seawater corrosion |
| Cast iron plug | HT200 | 1.6 | -15~150 | Surface treatment required |
| Stainless steel plug | ZG07Cr20Ni10 | 6.4 | -196~400 | Acid and alkali corrosion resistant |
Key technology innovation
Case: A 100,000-ton oil tanker uses FTS6020N1 stainless steel plug. Compared with traditional bronze material:
- Weight reduction of 18% (theoretical weight 3.0kg→2.7kg)
- Service life extended by 3 times (salt spray test＞2000h)
- Maintenance cycle extended from 6 months to 24 months
Implementation suggestions
- Selection principle: Stainless steel (N1/N3) is preferred for fuel pipelines, and bronze Q1 can be used for fresh water systems
- Installation points: Flange connection plugs must be pre-tightened according to CB/T4196 standard bolts (M12-M16 torque range, see Table 2)
- Acceptance criteria: Sealing test leakage ≤0.01×DN mm³/s (DN20 plug allows 0.2mm³/s)
Common questions about standard implementation
Q: How to identify the plug model?
A: According to the rule of 3.3.1, such as FLS6020N1 means: flange L-type tee, PN6, DN20, stainless steel ZG07Cr20Ni10
Q: How to deal with the transition period between the old and new standards?
A: After December 1, 2019, new projects must comply with GB/T593-2019, and old standard parts can be used for maintenance of existing equipment
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