{"id":6884,"date":"2026-11-10T05:17:09","date_gmt":"2026-11-10T05:17:09","guid":{"rendered":"https:\/\/www.henghuahose.com\/?p=6884"},"modified":"2026-11-10T05:17:12","modified_gmt":"2026-11-10T05:17:12","slug":"uscg-33-cfr-154-500-composite-hose","status":"publish","type":"post","link":"https:\/\/www.henghuahose.com\/id\/uscg-33-cfr-154-500-composite-hose\/","title":{"rendered":"USCG 33 CFR 154.500: What It Requires of a Hose"},"content":{"rendered":"<p>33 CFR 154.500 sets eight requirements for a hose assembly used to transfer oil or hazardous material at a US terminal. It fixes the design burst at four times the relief valve setting plus static head, and requires a working pressure above that same sum. It also restricts the connections and prescribes what must be marked on the hose, what may be recorded elsewhere, and what must never appear on the hose at all.<\/p>\n\n\n\n<p>This guide works through the clause paragraph by paragraph, from (a) to (h), and shows how each one translates into a specification a buyer can write. It also separates 154.500 from the test requirements in 33 CFR 156.170, because the two are often quoted as if they were one rule. A closing section sets out what an inspector will ask for when the hose is on the rack.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/uscg-33-cfr-154-500-hero.jpg\" alt=\"Dock hose end with a plain fabric band behind the flange, connected to terminal pipework, the coil running out of frame\" class=\"wp-image-6838\" srcset=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/uscg-33-cfr-154-500-hero.jpg 800w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/uscg-33-cfr-154-500-hero-300x225.jpg 300w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/uscg-33-cfr-154-500-hero-768x576.jpg 768w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/uscg-33-cfr-154-500-hero-16x12.jpg 16w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/uscg-33-cfr-154-500-hero-600x450.jpg 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>Figure 1. The band behind the flange is deliberately blank at this stage: the factory applies the service and pressure marking before dispatch, and the test values travel in the record that accompanies each assembly rather than appearing in the picture.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"what-does-33-cfr-154-500-apply-to\">What Does 33 CFR 154.500 Apply To?<\/h2>\n\n\n\n<p>The USCG hose requirements apply to each assembly used for transferring oil or hazardous material at a facility covered by 33 CFR part 154. The duty sits on the facility operator, not on the hose manufacturer. The rule tells the operator what the equipment must satisfy, and the operator satisfies it by buying and maintaining hose that meets the clause.<\/p>\n\n\n\n<p>That distinction matters when a supplier claims to be approved. No US Coast Guard approval is issued to a hose under this clause. What exists is a hose that meets the requirements and a facility that can show it, with records.<\/p>\n\n\n\n<p>The clause covers hose assemblies, which means the hose with its end fittings. A length of hose without fittings is not the object of the rule, and a fitting that is added later changes the assembly.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"how-is-the-design-burst-calculated\">How Is the Design Burst Calculated?<\/h2>\n\n\n\n<p>Paragraph (a) sets a minimum design burst pressure of at least four times the sum of the relief valve setting and the static head pressure at the point where the hose is installed. Where no relief valve is fitted, the maximum pump pressure takes the place of the setting.<\/p>\n\n\n\n<p>The calculation has three inputs and one multiplication.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The relief valve setting, in bar, or the maximum pump pressure if there is no relief valve.<\/li>\n\n\n\n<li>The static head at the hose, which is the height of the highest connected liquid level above the hose, converted to bar.<\/li>\n\n\n\n<li>A factor of four.<\/li>\n<\/ul>\n\n\n\n<p>A worked example makes the arithmetic clear. A berth with a 10 bar relief valve and a static head of 2 bar needs a design burst of at least 48 bar. A berth with a 12 bar setting and no static head needs at least 48 bar as well, which shows how a modest change in the setting moves the requirement.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Relief valve setting<\/th><th>Static head<\/th><th>Sum<\/th><th>Minimum design burst<\/th><\/tr><\/thead><tbody><tr><td>8 bar<\/td><td>1 bar<\/td><td>9 bar<\/td><td>36 bar<\/td><\/tr><tr><td>10 bar<\/td><td>2 bar<\/td><td>12 bar<\/td><td>48 bar<\/td><\/tr><tr><td>10 bar<\/td><td>4 bar<\/td><td>14 bar<\/td><td>56 bar<\/td><\/tr><tr><td>12 bar<\/td><td>2 bar<\/td><td>14 bar<\/td><td>56 bar<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><em>Table 1. Design burst examples under 33 CFR 154.500(a). The factor of four applies to the sum, not to the setting alone, which is the error that produces an under-rated hose.<\/em><\/p>\n\n\n\n<p>The error to watch for is applying the factor to the relief setting only. On a berth with a high manifold, the static head is a real part of the sum, and leaving it out understates the burst requirement by four times the head.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"what-working-pressure-must-the-hose-carry\">What Working Pressure Must the Hose Carry?<\/h2>\n\n\n\n<p>Paragraph (b) requires a maximum allowable working pressure above the same sum. The wording is &#8220;more than&#8221;, so equality is not enough: the MAWP must exceed the relief setting plus static head.<\/p>\n\n\n\n<p>For the example above, an MAWP above 12 bar satisfies the clause. In the composite standard, that points to a 14 bar type, since Types 3 and 4 are rated 14 bar with a proof pressure of 21 bar and a minimum burst of 56 bar. A 10 bar type would fail the clause on a 10 bar relief valve with any static head at all.<\/p>\n\n\n\n<p>The two paragraphs work as a pair. Paragraph (a) sets the strength of the hose and paragraph (b) sets the number printed on it, and both are derived from the same sum. A hose that satisfies one and not the other is not compliant, which is why the calculation should be kept with the hose records rather than done once at the design stage.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"which-connections-are-allowed\">Which Connections Are Allowed?<\/h2>\n\n\n\n<p>Paragraph (d) allows three connection types, and nothing else.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Full threaded connections.<\/li>\n\n\n\n<li>Flanges that meet ANSI B16.5 or ANSI B16.24.<\/li>\n\n\n\n<li>Quick-disconnect couplings that meet ASTM F1122.<\/li>\n<\/ul>\n\n\n\n<p>The flange requirement is the one that causes most purchase errors. A flange drilled to another pattern may fit the hose and not the manifold, and the mismatch is discovered at the berth. The clause names the standard, so the purchase order should name it as well.<\/p>\n\n\n\n<p>Paragraph (c) sits alongside the connection rules and is easy to overlook. Each nonmetallic hose must be usable for oil or hazardous material service, which is a statement about the liner rather than about the fittings. A hose with a liner that swells in the product fails this paragraph even if every pressure figure is correct.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"what-are-the-hose-marking-requirements\">What Are the Hose Marking Requirements?<\/h2>\n\n\n\n<p>Paragraph (e) carries the hose marking requirements: the hose must be marked with one of three statements, and the choice depends on the service.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Option<\/th><th>What is marked<\/th><th>When it is used<\/th><\/tr><\/thead><tbody><tr><td>1<\/td><td>The name of each product the hose may be used for<\/td><td>A single product or a short list<\/td><\/tr><tr><td>2<\/td><td>The words OIL SERVICE<\/td><td>Oil products only<\/td><\/tr><tr><td>3<\/td><td>HAZMAT SERVICE, SEE LIST, followed by a symbol<\/td><td>Hazardous materials, with a list in the facility manual or the vessel procedure<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><em>Table 2. The three marking options in 33 CFR 154.500(e). The third option moves the product list off the hose and into a document, which is why the symbol must match the list exactly.<\/em><\/p>\n\n\n\n<p>The third option is the one that fails audits. The symbol on the hose has to correspond to a list or chart in the facility operations manual or the vessel transfer procedure. That list has to identify the products that may be transferred through a hose bearing the symbol. A symbol with no list, or a list that has been revised without the hose being re-marked, is a finding.<\/p>\n\n\n\n<p>The hose marking requirements also assume legibility. A band that has worn until the letters are gone fails the clause in substance even though it once complied, which is why the pre-transfer check includes the marking.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"what-else-must-be-marked-or-recorded\">What Else Must Be Marked or Recorded?<\/h2>\n\n\n\n<p>Paragraph (f) adds three items: the maximum allowable working pressure, the date of manufacture, and the date of the latest test required by 33 CFR 156.170.<\/p>\n\n\n\n<p>The same paragraph allows a concession. The date of manufacture and the latest test date need not be marked on the hose if they are recorded in the hose records of the vessel or facility. The hose then has to carry a mark that identifies it with that information. In practice that means a hose number or tag that links the hose to its record.<\/p>\n\n\n\n<p>The concession is narrower than it looks. The MAWP must be marked on the hose, since the exception covers only the second and third items. And the identification mark has to be durable enough to survive the service, because a tag that has fallen off breaks the link between hose and record.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/uscg-33-cfr-154-500-requirements-map.jpg\" alt=\"Hose hung from a sling at a ship manifold with a drip tray under the joint\" class=\"wp-image-6839\" srcset=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/uscg-33-cfr-154-500-requirements-map.jpg 800w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/uscg-33-cfr-154-500-requirements-map-300x225.jpg 300w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/uscg-33-cfr-154-500-requirements-map-768x576.jpg 768w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/uscg-33-cfr-154-500-requirements-map-16x12.jpg 16w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/uscg-33-cfr-154-500-requirements-map-600x450.jpg 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>Figure 2. A hose hung on a sling at a ship manifold, with a tray under the joint: the arrangement an inspector sees first. The requirements that apply to it are listed in Table 1, and the test that follows them comes from a separate clause.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"what-must-not-be-marked\">What Must Not Be Marked?<\/h2>\n\n\n\n<p>Paragraph (g) is the one buyers rarely expect. The hose burst pressure and the pressure used for the 156.170 test must not be marked on the hose, and must be recorded elsewhere at the facility.<\/p>\n\n\n\n<p>The reasoning is practical. A burst figure on a hose invites someone to treat it as a service limit. A test pressure invites someone to repeat the test to that figure without the equipment or the procedure. Keeping the hose test pressure out of sight also stops a crew re-testing a line at a figure the berth was never prepared for. Both numbers stay in the records, where they belong.<\/p>\n\n\n\n<p>This creates an asymmetry that a specification has to respect. The MAWP goes on the hose, the burst and test pressures go in the file, and the file has to be retrievable for the hose in question. A hose with a burst figure stencilled on the cover is non-compliant even though the figure is correct.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"where-do-hose-test-pressure-and-frequency-come-from\">Where Do Hose Test Pressure and Frequency Come From?<\/h2>\n\n\n\n<p>They come from 33 CFR 156.170, which is a separate section. The test is a static liquid pressure test at not less than 1.5 times the maximum allowable working pressure, and the hose must not burst, bulge, leak or abnormally distort at that figure.<\/p>\n\n\n\n<p>Frequency is set by the same section: annually for facilities, or not less than 30 days before the first transfer conducted more than one year after the last tests and inspections. The whole external surface must be accessible during the test, and the test fluid must be a liquid compatible with the hose tube as recommended by the manufacturer.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Question<\/th><th>33 CFR 154.500<\/th><th>33 CFR 156.170<\/th><\/tr><\/thead><tbody><tr><td>Design strength<\/td><td>Burst at least 4x the sum<\/td><td>Not addressed<\/td><\/tr><tr><td>Working pressure<\/td><td>MAWP above the sum<\/td><td>Test at 1.5x MAWP<\/td><\/tr><tr><td>Marking<\/td><td>Product, MAWP, dates or records<\/td><td>Test date feeds the record<\/td><\/tr><tr><td>Kondisi<\/td><td>Product suitability, connections<\/td><td>Defect list and acceptance<\/td><\/tr><tr><td>Frequency<\/td><td>Not addressed<\/td><td>Annual, plus pre-transfer conditions<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><em>Table 3. How 33 CFR 154.500 and 33 CFR 156.170 divide the requirement. A hose file that answers one table and not the other is incomplete.<\/em><\/p>\n\n\n\n<p>The condition list in 156.170 is worth reading in full, because it is the retirement standard an inspector applies. A nonmetallic hose must have no unrepaired loose covers, kinks, bulges or soft spots, and no gouges, cuts or slashes that penetrate the first layer of reinforcement. A hose that fails the visual condition may still be accepted after a static liquid pressure test carried out in the presence of the Captain of the Port.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"does-the-clause-require-electrical-continuity\">Does the Clause Require Electrical Continuity?<\/h2>\n\n\n\n<p>No. 33 CFR 154.500 does not set a resistance limit for a hose, and it does not require a continuity test.<\/p>\n\n\n\n<p>Continuity is still required at most terminals; the requirement comes from the operator&#8217;s manual and the transfer procedure rather than from this clause. It is applied to the whole transfer system, not to the hose alone. A hose with a broken internal wire path can satisfy 154.500 and still fail the site procedure.<\/p>\n\n\n\n<p>The composite standard treats continuity as a separate performance requirement, which is why a hose datasheet may list it under performance rather than under marking. Buyers who need a specific resistance value should state the figure in the enquiry rather than assume the regulation supplies it.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"what-does-an-inspector-ask-for\">What Does an Inspector Ask For?<\/h2>\n\n\n\n<p>An inspection follows a fixed order, and each step tests a different claim.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Read the marking band and confirm the product service, the working pressure and the identification mark.<\/li>\n\n\n\n<li>Match the identification mark to the facility file entry, not to a delivery note.<\/li>\n\n\n\n<li>Confirm the test date in the file is the latest one and falls inside the annual window.<\/li>\n\n\n\n<li>Check the flange pattern against the manifold, not against the last order.<\/li>\n\n\n\n<li>Look for the two figures that must not be on the band: burst pressure and test pressure.<\/li>\n\n\n\n<li>Record the assembly serial number against the product list the symbol refers to.<\/li>\n<\/ol>\n\n\n\n<p>An inspector working through the USCG hose requirements will find very little to question when the file and the hose agree. The failures we hear about are almost always a mismatch: a re-marked hose, a record for a different assembly, or a test date that was never transferred to the file.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"how-does-a-composite-hose-meet-these-requirements\">How Does a Composite Hose Meet These Requirements?<\/h2>\n\n\n\n<p>A composite hose suits the clause well, for three reasons.<\/p>\n\n\n\n<p>The first is the burst margin. The standard already sets a minimum burst at four times the working pressure for every type, which lines up with the factor of four in paragraph (a) before the static head is added. A buyer still has to run the sum for the specific berth, but the starting point is in the right place.<\/p>\n\n\n\n<p>The second is the marking surface. A composite hose carries a coated fabric cover that takes a printed band, and the band can hold the product service, the MAWP and the identification mark without a separate tag. The burst and test figures stay in the file, as paragraph (g) requires.<\/p>\n\n\n\n<p>The third is the failure behaviour. A hose that weeps before it bursts gives the operator a chance to stop the transfer, which is the outcome the whole clause is built around. Our <a href=\"https:\/\/www.henghuahose.com\/id\/composite-hose-leak-before-burst\/\" target=\"_blank\" rel=\"noopener\">explanation of leak before burst<\/a> covers the mechanism.<\/p>\n\n\n\n<p>What a composite hose does not do is exceed its own pressure class. A 14 bar type is 14 bar, and a berth whose relief setting plus static head approaches that figure needs a different construction rather than a higher marking.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/uscg-33-cfr-154-500-marking-vs-records.jpg\" alt=\"Blank marking band on a hose with a stack of paperwork behind it\" class=\"wp-image-6867\" srcset=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/uscg-33-cfr-154-500-marking-vs-records.jpg 800w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/uscg-33-cfr-154-500-marking-vs-records-300x225.jpg 300w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/uscg-33-cfr-154-500-marking-vs-records-768x576.jpg 768w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/uscg-33-cfr-154-500-marking-vs-records-16x12.jpg 16w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/uscg-33-cfr-154-500-marking-vs-records-600x450.jpg 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>Figure 3. The band on this hose has not been written yet, and the file behind it is where the rest goes. On a delivered assembly the band carries the service and the working pressure, while the test date and the burst figure stay in the record, as Table 2 sets out.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"faq\">Frequently Asked Questions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-does-33-cfr-154-500-require\">What does 33 CFR 154.500 require?<\/h3>\n\n\n\n<p>It requires a design burst of at least four times the relief valve setting plus static head, and a working pressure above that sum. It also covers suitable materials, approved connections, product and pressure marking, a ban on marking burst or test pressure, and a back pressure shutoff nozzle for certain fuel transfers.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"where-do-the-uscg-hose-requirements-come-from\">Where do the USCG hose requirements come from?<\/h3>\n\n\n\n<p>They come from 33 CFR 154.500 for the hose itself and 33 CFR 156.170 for the test and condition checks. Both sections apply to the facility operator rather than to the hose maker.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"is-33-cfr-154-500-a-certification-for-a-hose\">Is 33 CFR 154.500 a certification for a hose?<\/h3>\n\n\n\n<p>No. It is a requirement on the facility operator. No US Coast Guard approval is issued to a hose under this clause, and a supplier who claims one is misstating the position.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-is-the-hose-test-pressure\">What is the hose test pressure?<\/h3>\n\n\n\n<p>It is 1.5 times the maximum allowable working pressure under 33 CFR 156.170, not a figure from 154.500. The test pressure must be recorded in the facility file and must not be marked on the hose.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"can-the-test-date-be-kept-in-a-file-instead-of-on-the-hose\">Can the test date be kept in a file instead of on the hose?<\/h3>\n\n\n\n<p>Yes, for the date of manufacture and the date of the latest test, provided the hose is marked so it can be identified with that record. The maximum allowable working pressure must still be on the hose.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"which-flanges-are-acceptable\">Which flanges are acceptable?<\/h3>\n\n\n\n<p>Flanges meeting ANSI B16.5 or ANSI B16.24, full threaded connections, or quick-disconnect couplings meeting ASTM F1122. Other patterns do not satisfy paragraph (d).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-is-the-paragraph-h-nozzle-requirement\">What is the paragraph (h) nozzle requirement?<\/h3>\n\n\n\n<p>A hose used to transfer fuel to a vessel whose fill pipe cannot practically be fitted with containment must have an automatic back pressure shutoff nozzle. It applies to that fuel transfer case, not to every hose at the terminal.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-does-154-500-relate-to-en-13765\">How does 154.500 relate to EN 13765?<\/h3>\n\n\n\n<p>The two documents answer different questions: the clause sets what the terminal must provide, and EN 13765 tells a manufacturer how to build and test a composite hose. Our <a href=\"https:\/\/www.henghuahose.com\/id\/en-13765-composite-hose-types\/\" target=\"_blank\" rel=\"noopener\">type guide<\/a> shows where the standard&#8217;s burst figures sit against the four-to-one factor.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"about-henghua\">About HENGHUA<\/h2>\n\n\n\n<p>HENGHUA supplies terminal hose assemblies in PTFE, UHMWPE, XLPE and polypropylene linings, a woven fabric reinforcement, and a stainless steel or coated carbon steel helix, in bores from 25 mm to 300 mm. Ends are crimped or flanged, with fixed or floating flanges drilled to the pattern named in the order, and each assembly is pressure tested with the result recorded against its identification.<\/p>\n\n\n\n<p>We do not hold a US Coast Guard approval and we do not claim one. What we supply is a hose built to the dimensions and pressure class you specify, with a tested burst margin. It carries a marking band that can hold the product service and the working pressure, and a test record that a facility can file. The <a href=\"https:\/\/www.henghuahose.com\/id\/product\/marine-composite-hose-for-ship-to-shore\/\" target=\"_blank\" rel=\"noopener\">marine composite hose range<\/a> shows the terminal build, the <a href=\"https:\/\/www.henghuahose.com\/id\/chemical-hose-marking-static-electrostatic-requirements\/\" target=\"_blank\" rel=\"noopener\">marking and static requirements note<\/a> covers the marking detail, and the full range sits in the <a href=\"https:\/\/www.henghuahose.com\/id\/product-category\/industrial-hose\/composite-hose\/\" target=\"_blank\" rel=\"noopener\">composite hose category<\/a>. Send the relief valve setting, the static head and the product list, and we will return a hose that matches the calculation in Table 1.<\/p>","protected":false},"excerpt":{"rendered":"<p>33 CFR 154.500 sets eight requirements for a hose assembly used to transfer oil or hazardous material at a US terminal. It fixes the design burst at four times the relief valve setting plus static head, and requires a working pressure above that same sum. It also restricts the connections and prescribes what must be 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