{"id":5118,"date":"2026-10-05T08:09:21","date_gmt":"2026-10-05T00:09:21","guid":{"rendered":"https:\/\/gh-petro.com\/?p=5118"},"modified":"2026-10-05T08:11:05","modified_gmt":"2026-10-05T00:11:05","slug":"comment-fonctionne-la-machine-dessai-hydrostatique-pour-les-tubes-en-acier-dont-le-diametre-exterieur-est-inferieur-a-20-mm-quel-est-son-principe-de-fonctionnement-sa-structure-et-en-quoi-differe","status":"publish","type":"post","link":"https:\/\/gh-petro.com\/fr\/how-does-the-hydrostatic-testing-machine-for-steel-tubes-with-od-less-than-20mm-work-its-principle-structure-and-differences-from-large-bore-models\/","title":{"rendered":"Comment fonctionne la machine d'essai hydrostatique pour tubes en acier dont le diam\u00e8tre ext\u00e9rieur est inf\u00e9rieur \u00e0 20 mm ? Quel est son principe de fonctionnement, sa structure et en quoi diff\u00e8re-t-elle des mod\u00e8les destin\u00e9s aux tubes de grand diam\u00e8tre ?"},"content":{"rendered":"<h2><strong><b>Pr\u00e9sentation g\u00e9n\u00e9rale<\/b><\/strong><\/h2>\n<p>In the precision steel tube manufacturing industry,<strong>hydrostatic testing machine for small diameter steel tubes<\/strong>\u00a0has become indispensable core testing equipment. It is specially designed for rigorous pressure inspection of seamless steel tubes, welded steel tubes, and precision instrument steel tubes with an outer diameter (OD) less than 20mm. Unlike conventional large-bore hydrostatic testers used for industrial pipeline steel pipes, this small-diameter hydrostatic testing equipment focuses on high-precision pressure detection, micro-seal stability, and high-efficiency batch testing for tiny steel tubes.<\/p>\n<p><iframe title=\"GH HYDROTESTER multi-postes\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/xQHQRcxWitc?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<h2><strong><b>1. Working Principle of Hydrostatic Testing Machine for OD &lt;20mm Steel Tubes<\/b><\/strong><\/h2>\n<p>The working logic of <strong>small bore tube hydrostatic test<\/strong><strong>ing<\/strong><strong>\u00a0<\/strong><strong>machine<\/strong>\u00a0follows international standard hydrostatic testing specifications such as ISO 15363 and API 570, adopting pneumatic hydraulic booster pressure boost and closed-loop pressure maintenance testing technology. Its core principle is to use water as the pressure medium, fill the sealed small-diameter steel tube with high-purity water, and apply stable preset hydraulic pressure to the tube inner wall, so as to verify the pressure resistance and tightness of the steel tube.<\/p>\n<p>Different from large-bore testing equipment, the test principle of small-diameter machines is optimized for the structural characteristics of tiny steel tubes with small inner diameter, thin tube wall, and easy deformation. The complete testing process is divided into six precise steps, with full-process PLC automatic control to avoid manual operation errors:<\/p>\n<h3><strong><b>Step 1: Precise Positioning and Micro Sealing<\/b><\/strong><\/h3>\n<p>Place the OD 0-20mm steel tube on the precision positioning fixture. The equipment adopts customized micro radial sealing components to perform end-face sealing on both ends of the tiny steel tube. It effectively solves the problem of easy pressure leakage in small-caliber tube testing and lays a foundation for subsequent high-precision pressure testing.<\/p>\n<h3><strong><b>Step 2: Water Filling and Air Exhaust<\/b><\/strong><\/h3>\n<p>The automatic water supply system injects deaerated pure water into the steel tube. The built-in exhaust valve completely discharges residual air inside the tube. Trapped air will cause pressure fluctuation and reduce test accuracy, so full air exhaust is a key step to ensure test authenticity.<\/p>\n<h3><strong><b>Step 3: Stepped Pressure Boosting<\/b><\/strong><\/h3>\n<p>The equipment takes 3-8\u00a0bar compressed air as the power source, drives the pneumatic liquid booster pump to convert low-pressure air into high-stability hydraulic pressure, and performs stepped pressurization on the steel tube according to the preset test pressure (0.4-16MPa adjustable). The stepped pressurization mode avoids instantaneous high-pressure impact and prevents deformation or damage to thin-walled small-diameter steel tubes.<\/p>\n<h3><strong><b>Step 4: Constant Pressure Holding and Real-time Monitoring<\/b><\/strong><\/h3>\n<p>After reaching the standard test pressure, the system automatically locks the pressure and maintains the pressure for 5-300 seconds (customizable). The high-precision pressure sensor collects pressure data in real time throughout the process, accurately capturing tiny pressure changes caused by tube wall leakage or micro deformation.<\/p>\n<h3><strong><b>Step 5: Pressure Relief and Water Drainage<\/b><\/strong><\/h3>\n<p>After the pressure holding test is qualified, the system automatically and slowly releases pressure to avoid sudden pressure drop causing secondary damage to the steel tube. Then the residual water in the tube is drained completely to prevent tube wall corrosion.<\/p>\n<h3><strong><b>Step 6: Automatic Judgment and Data Recording<\/b><\/strong><\/h3>\n<p>The PLC system intelligently judges the test result: if the pressure drop is within the standard range and no water seepage or leakage occurs, the steel tube is qualified; otherwise, it is marked as unqualified. All test data, including test pressure, holding time, and pressure drop value, is automatically stored, recorded, and can be printed into test reports, meeting factory inspection and customer audit standards.<\/p>\n<h2><strong><b>2. Core Equipment Composition of Small-Diameter (OD\uff1c20mm) Hydrostatic Testing Machine<\/b><\/strong><\/h2>\n<p><strong>Hydrostatic testing machine for small diameter steel tubes<\/strong>\u00a0adopts an integrated compact structural design, which is different from the split heavy-duty structure of large-bore equipment. The whole machine is composed of six core systems, with precise matching of each component, focusing on solving the pain points of difficult sealing, unstable pressure, and low efficiency in small-caliber steel tube testing.<\/p>\n<h3><strong><b>2.1 Precision Sealing and Positioning System<\/b><\/strong><\/h3>\n<p>This is the most critical core component for small-diameter tube testing. Equipped with customized micro polyurethane sealing rings and high-precision end-face sealing components, it is compatible with all steel tubes with OD 5-20mm. Compared with the thick sealing structure of large water pressure machines, the micro sealing parts have higher fitting accuracy, can achieve zero leakage sealing under high pressure, and will not squeeze and deform thin-walled small steel tubes. At the same time, the adjustable precision fixture can realize rapid positioning of steel tubes of different specifications, improving the clamping efficiency of batch testing.<\/p>\n<h3><strong><b>2.2 Pneumatic Hydraulic Booster Pressure System<\/b><\/strong><\/h3>\n<p>Driven by a high-efficiency pneumatic liquid booster pump, it converts conventional compressed air into stable high-pressure hydraulic power. The system supports stepless adjustment of test pressure from 0.4MPa to 16MPa, fully covering the test pressure requirements of precision small-diameter steel tubes such as instrument tubes and automobile oil pipes. The pressure boosting speed is uniform and controllable, effectively avoiding the problem of local stress concentration of small tubes caused by rapid pressure surge.<\/p>\n<h3><strong><b>2.3 PLC Intelligent Control System<\/b><\/strong><\/h3>\n<p>Equipped with industrial-grade PLC controller and touch human-machine interface, it realizes one-key automatic operation of the whole process of water filling, exhaust, pressurization, pressure holding, pressure relief and water drainage. The system has built-in international standard test parameters, supports custom parameter setting, and has multiple protection functions such as over-pressure protection, over-time protection and leakage alarm. It greatly reduces manual intervention and improves test consistency and repeatability.<\/p>\n<h3><strong><b>2.4 High-Precision Pressure Detection System<\/b><\/strong><\/h3>\n<p>Configured with imported high-sensitivity pressure sensors, the pressure detection accuracy reaches \u00b10.01MPa, which can capture micro pressure changes that cannot be detected by ordinary large-bore testing machines. It can accurately identify tiny leakage defects of small-diameter steel tubes, ensuring 100% detection of unqualified products. The real-time pressure curve is displayed on the screen, and the test data is stored permanently for traceability.<\/p>\n<h3><strong><b>2.5 Integrated Water Supply and Circulation System<\/b><\/strong><\/h3>\n<p>Adopts a closed-loop water circulation design, equipped with a precision filter and deaeration device. It removes impurities and dissolved air in the test water, avoiding pipeline blockage and test data deviation. The system has the characteristics of low water consumption and high water supply efficiency, which is more energy-saving and environmentally friendly than the large-flow water supply system of large-diameter water pressure machines.<\/p>\n<h3><strong><b>2.6 Safety Protection and Mechanical Frame System<\/b><\/strong><\/h3>\n<p>The whole machine adopts a compact high-strength welded frame, which is small in floor area and stable in operation. It is equipped with a fully enclosed safety protective cover and emergency stop device. Once abnormal conditions such as sudden pressure relief and pipeline blockage occur, the equipment will stop running immediately to ensure the safety of operators and equipment. Compared with the heavy reinforced frame of large-scale equipment, it is more lightweight and suitable for workshop batch production and line layout.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-medium wp-image-5062\" src=\"http:\/\/gh-petro.com\/wp-content\/uploads\/2026\/09\/New-Hydro-Tester-2-300x300.png\" alt=\"\" width=\"300\" height=\"300\" srcset=\"https:\/\/gh-petro.com\/wp-content\/uploads\/2026\/09\/New-Hydro-Tester-2-300x300.png 300w, https:\/\/gh-petro.com\/wp-content\/uploads\/2026\/09\/New-Hydro-Tester-2-150x150.png 150w, https:\/\/gh-petro.com\/wp-content\/uploads\/2026\/09\/New-Hydro-Tester-2-768x768.png 768w, https:\/\/gh-petro.com\/wp-content\/uploads\/2026\/09\/New-Hydro-Tester-2-12x12.png 12w, https:\/\/gh-petro.com\/wp-content\/uploads\/2026\/09\/New-Hydro-Tester-2.png 1000w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/> <img decoding=\"async\" class=\"alignnone size-medium wp-image-4021\" src=\"http:\/\/gh-petro.com\/wp-content\/uploads\/2026\/06\/\u03c612-42-300x300.jpg\" alt=\"\" width=\"300\" height=\"300\" srcset=\"https:\/\/gh-petro.com\/wp-content\/uploads\/2026\/06\/\u03c612-42-300x300.jpg 300w, https:\/\/gh-petro.com\/wp-content\/uploads\/2026\/06\/\u03c612-42-150x150.jpg 150w, https:\/\/gh-petro.com\/wp-content\/uploads\/2026\/06\/\u03c612-42-12x12.jpg 12w, https:\/\/gh-petro.com\/wp-content\/uploads\/2026\/06\/\u03c612-42.jpg 450w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<h2><strong><b>3. Key Differences: Small Bore (OD\uff1c20mm) vs Large Diameter Hydrostatic Testing Machine<\/b><\/strong><\/h2>\n<p>Many global buyers are confused about the selection of steel tube hydrostatic testing equipment. In fact, <strong>small bore tube hydrostatic pressure test equipment<\/strong>\u00a0and large-diameter hydrostatic testing machines (OD\uff1e120mm) are essentially different in structural design, test logic, application scenarios and performance parameters. The core differences are summarized as follows, helping you accurately match equipment according to production needs.<\/p>\n<h3><strong><b>3.1 Structural Design and Volume Difference<\/b><\/strong><\/h3>\n<p>Large-diameter hydrostatic testing machines are designed for large-size steel pipes such as spiral welded pipes and LSAW pipes, with a super-long test bench (up to 12m or longer), heavy-duty load-bearing rollers and thickened reinforced frames. The whole equipment is huge in size, heavy in weight and occupies a large workshop area, which is suitable for large-scale pipeline production lines.<\/p>\n<p>In contrast, the hydrostatic testing machine for OD\uff1c20mm steel tubes adopts an integrated compact design, with a small floor area and flexible layout. It abandons the heavy load-bearing structure and adopts precision micro fixtures and lightweight frames. It is specially optimized for the small size and light weight of tiny steel tubes, and is more suitable for precision steel tube processing workshops and small and medium-sized production lines.<\/p>\n<h3><strong><b>3.2 Sealing System and Test Accuracy Difference<\/b><\/strong><\/h3>\n<p>Large-bore water pressure machines adopt thickened end-face sealing or hydraulic self-sealing structure, which has strong pressure resistance but low precision. It is only suitable for large-diameter and thick-walled steel pipes with low detection accuracy requirements, and cannot identify micro leakage defects of small tubes.<\/p>\n<p>Small-diameter testing equipment focuses on <strong>micro-sealing and high-precision detection<\/strong>. The customized ultra-fine sealing accessories perfectly fit the tiny tube mouth of OD\uff1c20mm steel tubes, realizing zero-leakage high-pressure sealing. With high-precision pressure sensors and stable stepped pressure control, the test accuracy is 5-10 times that of large-scale equipment, which can meet the strict quality inspection standards of precision steel tubes.<\/p>\n<h3><strong><b>3.3 Pressure Control and Test Mode Difference<\/b><\/strong><\/h3>\n<p>Large-diameter hydrostatic testing machines adopt one-time rapid pressurization, with large pressure fluctuation range and low pressure control accuracy. The pressure holding time is fixed in a single mode, which is only suitable for conventional industrial pipeline testing with low precision requirements.<\/p>\n<p>The small-bore model supports <strong>stepped variable pressure boosting and flexible pressure holding<\/strong>, with stable pressure output and tiny pressure fluctuation. It can customize test pressure and holding time according to different tube wall thicknesses and material characteristics of small-diameter steel tubes, effectively preventing thin-walled tubes from deformation and damage during testing, and realizing personalized high-precision testing.<\/p>\n<h3><strong><b>3.4 Application Scenarios and Testing Efficiency Difference<\/b><\/strong><\/h3>\n<p>Large-diameter hydrostatic testing machines are mainly used for pressure testing of large pipeline steel pipes for oil, natural gas and water transmission, focusing on large-volume single-tube testing with low batch efficiency.<\/p>\n<p>The hydrostatic testing machine for OD\uff1c20mm steel tubes is oriented to precision manufacturing fields such as automobile manufacturing, aerospace, instrument equipment and hydraulic pneumatic systems. It supports fast batch testing of tiny steel tubes, with short single-tube test cycle and high production efficiency, fully adapting to the high-frequency and high-precision production and inspection needs of small-diameter precision steel tubes.<\/p>\n<h3><strong><b>3.5 Energy Consumption and Operation Cost Difference<\/b><\/strong><\/h3>\n<p>Large-scale water pressure machines are equipped with large-flow water supply systems and high-power hydraulic units, with high water consumption, high power consumption and high daily operation and maintenance costs. The bulky sealing parts and mechanical structures are also costly to maintain and replace.<\/p>\n<p>Small-diameter testing equipment adopts a closed-loop energy-saving design, with low water and power consumption. The precision parts have stable performance and long service life, and the later maintenance cost is low. It is more cost-effective for long-term batch testing of small-caliber steel tubes.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-medium wp-image-4022\" src=\"http:\/\/gh-petro.com\/wp-content\/uploads\/2026\/06\/\u03c612-89-300x300.jpg\" alt=\"\" width=\"300\" height=\"300\" srcset=\"https:\/\/gh-petro.com\/wp-content\/uploads\/2026\/06\/\u03c612-89-300x300.jpg 300w, https:\/\/gh-petro.com\/wp-content\/uploads\/2026\/06\/\u03c612-89-1024x1024.jpg 1024w, https:\/\/gh-petro.com\/wp-content\/uploads\/2026\/06\/\u03c612-89-150x150.jpg 150w, https:\/\/gh-petro.com\/wp-content\/uploads\/2026\/06\/\u03c612-89-768x768.jpg 768w, https:\/\/gh-petro.com\/wp-content\/uploads\/2026\/06\/\u03c612-89-12x12.jpg 12w, https:\/\/gh-petro.com\/wp-content\/uploads\/2026\/06\/\u03c612-89.jpg 1280w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/> <img decoding=\"async\" class=\"alignnone size-medium wp-image-4021\" src=\"http:\/\/gh-petro.com\/wp-content\/uploads\/2026\/06\/\u03c612-42-300x300.jpg\" alt=\"\" width=\"300\" height=\"300\" srcset=\"https:\/\/gh-petro.com\/wp-content\/uploads\/2026\/06\/\u03c612-42-300x300.jpg 300w, https:\/\/gh-petro.com\/wp-content\/uploads\/2026\/06\/\u03c612-42-150x150.jpg 150w, https:\/\/gh-petro.com\/wp-content\/uploads\/2026\/06\/\u03c612-42-12x12.jpg 12w, https:\/\/gh-petro.com\/wp-content\/uploads\/2026\/06\/\u03c612-42.jpg 450w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<h2><strong><b>4. Why Choose Specialized Hydrostatic Testing Machine for OD\uff1c20mm Steel Tubes?<\/b><\/strong><\/h2>\n<p>In the production of small-diameter precision steel tubes, many manufacturers mistakenly use adjusted large-bore water pressure machines for testing, which often leads to problems such as inaccurate test data, tube deformation, low qualification rate of finished products and high production loss. Professional <strong>hydrostatic testing machine for small diameter steel tubes<\/strong>\u00a0is specially customized for the structural characteristics of OD 0-20mm steel tubes, with the following irreplaceable advantages:<\/p>\n<p>First, high detection accuracy, effectively capturing micro defects of small tubes to ensure product quality compliance; second, zero damage test, avoiding thin-walled tube deformation caused by improper pressure control; third, high batch test efficiency, adapting to mass production needs; fourth, complete data traceability, meeting international export inspection standards; fifth, low energy consumption and low maintenance cost, reducing enterprise production costs.<\/p>\n<h2><strong><b>Conclusion<\/b><\/strong><\/h2>\n<p>Le <strong>hydrostatic testing machine for steel tubes OD less than 20mm<\/strong>\u00a0is professional high-precision testing equipment differentiated from traditional large-diameter water pressure machines. It has unique advantages in working principle optimization, structural design, sealing accuracy and batch test efficiency, and is the core quality assurance equipment for precision small-diameter steel tube manufacturing enterprises.<\/p>\n<p>Different from the heavy and low-precision design of large-bore testing equipment, small-diameter hydrostatic testers take precision, stability and efficiency as the core, perfectly matching the strict testing standards of automobile oil pipes, instrument tubes, aerospace precision steel tubes and other products. For global steel tube manufacturers focusing on small-caliber precision tube production, choosing a dedicated small-diameter hydrostatic testing machine is the key to improving product qualification rate and market competitiveness.<\/p>","protected":false},"excerpt":{"rendered":"<p>Overview In the precision steel tube manufacturing industry,hydrostatic testing machine for small diameter steel tubes\u00a0has become indispensable core testing equipment. It is specially designed for rigorous pressure inspection of seamless steel tubes, welded steel tubes, and precision instrument steel tubes with an outer diameter (OD) less than 20mm. Unlike conventional large-bore hydrostatic testers used for [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":5066,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-5118","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"_links":{"self":[{"href":"https:\/\/gh-petro.com\/fr\/wp-json\/wp\/v2\/posts\/5118","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gh-petro.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gh-petro.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gh-petro.com\/fr\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/gh-petro.com\/fr\/wp-json\/wp\/v2\/comments?post=5118"}],"version-history":[{"count":0,"href":"https:\/\/gh-petro.com\/fr\/wp-json\/wp\/v2\/posts\/5118\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/gh-petro.com\/fr\/wp-json\/wp\/v2\/media\/5066"}],"wp:attachment":[{"href":"https:\/\/gh-petro.com\/fr\/wp-json\/wp\/v2\/media?parent=5118"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gh-petro.com\/fr\/wp-json\/wp\/v2\/categories?post=5118"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gh-petro.com\/fr\/wp-json\/wp\/v2\/tags?post=5118"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}