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Understanding Working Pressure vs. Burst Pressure in High-Pressure Hydraulic Hoses

What Is the Difference Between Working Pressure and Burst Pressure?

The working pressure of a hydraulic hose is the maximum pressure it can safely handle during continuous operation. Burst pressure is the minimum pressure at which the hose fails during laboratory testing. According to SAE and EN standards, burst pressure must be at least four times the working pressure.

Key Takeaways

Working pressure is the maximum safe operating pressure for continuous hydraulic system use
Burst pressure must be at least 4× working pressure per SAE J517 and EN standards
Proof pressure is typically 2× working pressure and used only for factory testing
Hydraulic hoses should never operate above working pressure under any circumstances
Pressure spikes, temperature changes, and installation quality all affect real-world pressure capacity
SAE 100R2AT provides medium-pressure capability; SAE 100R15 handles ultra-high-pressure applications
Always select hoses based on working pressure, not burst pressure ratings

Working Pressure vs Burst Pressure:

Parameter	Working Pressure	Proof Pressure	Burst Pressure
Purpose	Daily system operation	Factory production testing	Laboratory failure threshold
Typical Ratio	1× (baseline)	2× working pressure	4× working pressure (minimum)
Can system operate here?	Yes – designed for continuous use	No – testing only	No – catastrophic failure point
Safety Level	Safe operating zone	Unsafe for operation	Structural failure
Example (SAE 100R2AT ⅜”)	4,000 psi	8,000 psi	16,000 psi

A hydraulic hose should never operate above its rated working pressure. Burst pressure is only a laboratory failure threshold and should not be used as an operating limit. The critical distinction between these two ratings forms the foundation of hydraulic system safety—working pressure defines the safe envelope for daily operations, while burst pressure represents the absolute failure point under controlled test conditions.

This comprehensive guide explains the engineering principles behind both pressure ratings, provides a detailed pressure rating chart for all SAE standard hoses, offers real-world selection examples, covers inspection procedures, and answers the most frequently asked questions about hydraulic hose pressure ratings.

Hydraulic Hose Pressure Terminology

Term	Definition	Typical Ratio	Application
Working Pressure (WP)	Maximum pressure for continuous safe operation	1×	Primary selection criterion
Proof Pressure	Factory test pressure to verify integrity	2× WP	Production quality control
Burst Pressure (BP)	Minimum pressure at which hose fails	4× WP (minimum)	Laboratory compliance testing
Test Pressure (TP)	Sometimes used interchangeably with proof pressure	2× WP	Verification testing
Impulse Test	Repeated pressure cycle endurance test	Varies by grade	Fatigue resistance evaluation
Safety Factor	Ratio of burst pressure to working pressure	4:1 minimum	Safety margin calculation
Pressure Spike	Short-term pressure surge above working pressure	Up to 133% WP	Transient event tolerance
Fatigue Pressure	Pressure level for cyclic endurance testing	>2× WP	Service life prediction

Working Pressure vs Burst Pressure vs Proof Pressure: Complete Comparison

Parameter	Working Pressure	Proof Pressure	Burst Pressure
Definition	Maximum pressure for continuous normal operation	Test pressure to verify structural integrity	Minimum pressure at which hose fails
Standard Ratio	1×	2×	4× (minimum)
Testing Standard	SAE J517 performance rating	SAE J343 production verification	SAE J343 destructive testing
Effect on Hose	No damage, designed for full service life	Elastic deformation only, returns to original shape	Permanent structural failure
Operating Use	Yes – intended operating range	No – testing only, never in service	No – laboratory destructive test only
Safety Margin	Built-in safety factor	Temporary elastic limit	Ultimate failure point
Field Application	System design and selection	Quality control verification	Compliance certification
User Reference	Primary selection criterion	Not applicable for users	Secondary verification only

What Is Working Pressure in Hydraulic Hoses?

Definition and Significance

Working pressure (also called operating pressure or rated working pressure) is the maximum continuous internal pressure a hydraulic hose can safely withstand during normal operation throughout its expected service life. This rating is established by manufacturers through standardized testing procedures including SAE J343 and represents the pressure level at which the hose can operate reliably for thousands of impulse cycles.

According to SAE J343 test procedures, hydraulic hoses operating within their rated working pressure are designed to achieve their specified service life when properly installed and maintained. The working pressure rating accounts for normal variations in operating conditions and provides a safe operating envelope for daily use.

Common Working Pressure Ranges by Application

Application Type	Typical Working Pressure Range	Common Hose Types
Low-pressure return lines	Up to 300 psi	100R1AT (larger diameters)
Medium-pressure systems	300 – 3,000 psi	100R1AT, 100R17
High-pressure mobile equipment	3,000 – 6,000 psi	100R2AT, 100R12
Ultra-high-pressure industrial	6,000+ psi	100R13, 100R15

What Is Burst Pressure in Hydraulic Hoses?

Definition and Testing Standards

Burst pressure is the minimum internal pressure at which a hydraulic hose will rupture or fail catastrophically under laboratory test conditions. According to SAE J343 testing standards, burst pressure is determined by subjecting a hose to increasing internal pressure until failure occurs—the recorded pressure at the moment of failure is the burst pressure.

What Pressure Causes a Hydraulic Hose to Burst?

A hydraulic hose bursts when internal pressure exceeds its rated burst pressure. However, in real-world conditions, hoses can fail below their rated burst pressure due to accumulated fatigue damage from pressure cycling, heat aging, mechanical damage, or fluid incompatibility. The rated burst pressure is a laboratory benchmark—actual failure pressure in service is often lower due to these contributing factors.

Why Do Hydraulic Hoses Fail Below Rated Burst Pressure?

Hoses can fail below their rated burst pressure because fatigue damage accumulates over time. Repeated pressure cycling, even within working pressure limits, progressively weakens reinforcement layers. Temperature exposure, ozone damage, and abrasion also reduce the actual burst pressure. Regular inspection and replacement based on service life is essential, not just pressure monitoring.

The 4:1 Safety Factor Explained

The 4:1 safety factor (or burst ratio) is a fundamental safety requirement in hydraulic hose standards. This means:

Minimum burst pressure = 4 × Working pressure

For example, a hose with a 3,000 psi working pressure must have a minimum burst pressure of 12,000 psi.

Why the 4:1 Ratio Matters

The safety factor accounts for:

Pressure spikes during system operation
Variations in material properties
Manufacturing tolerances
Wear and degradation over time
Temperature effects on hose performance
Installation stresses and bending radius constraints

In practice, quality hoses from reputable manufacturers typically exceed the minimum 4:1 ratio to provide an additional margin of safety.

Can a Hydraulic Hose Reach Burst Pressure?

No. Operating near burst pressure is extremely dangerous and violates SAE safety standards. Hoses should never be operated above their rated working pressure. The burst pressure rating is a laboratory test threshold only—it should never be approached in actual operation.

How Often Should Hydraulic Hoses Be Pressure Tested?

Industry best practice recommends hydraulic hose assemblies be pressure tested:

Upon installation – Before being placed into service
After any repair or modification – To verify assembly integrity
At least annually – For critical or high-pressure applications
Following any severe pressure event – Such as a system overpressure incident
Per manufacturer recommendations – Based on specific service conditions

Hydraulic Hose Pressure Ratings Chart (SAE J517)

Complete Pressure Rating Reference Table

SAE Standard	Construction Type	Hose Size	Working Pressure (psi)	Proof Pressure (psi)	Burst Pressure (psi)
100R1AT	Single steel wire braid	¼”	3,270	6,540	13,080
100R1AT	Single steel wire braid	⅜”	2,720	5,440	10,880
100R1AT	Single steel wire braid	½”	2,180	4,360	8,720
100R1AT	Single steel wire braid	¾”	1,450	2,900	5,800
100R1AT	Single steel wire braid	1″	1,160	2,320	4,640
100R2AT	Two steel wire braids	¼”	5,800	11,600	23,200
100R2AT	Two steel wire braids	⅜”	4,000	8,000	16,000
100R2AT	Two steel wire braids	½”	3,350	6,700	13,400
100R2AT	Two steel wire braids	¾”	2,250	4,500	9,000
100R2AT	Two steel wire braids	1″	1,625	3,250	6,500
100R12	Four spiral wire	1″ – 2″	4,000	8,000	16,000
100R13	Four/six spiral wire	1″ – 2″	5,000	10,000	20,000
100R15	Six spiral wire	1″ – 2″	6,000	12,000	24,000
100R17	Compact one/two braid	All sizes	3,000	6,000	12,000

EN 853 vs SAE Standard Cross Reference

EN Standard	SAE Equivalent	Construction Type	Pressure Rating Basis
EN 853 1SN	SAE 100R1AT	Single steel wire braid	4:1 burst ratio
EN 853 2SN	SAE 100R2AT	Two steel wire braids	4:1 burst ratio
EN 857 1SC	SAE 100R17	Compact single braid	4:1 burst ratio
EN 857 2SC	SAE 100R17	Compact two braid	4:1 burst ratio

Key Differences Between EN and SAE Ratings

While both standards require the 4:1 safety factor, pressure ratings can vary slightly for equivalent hoses due to different reference conditions. EN 853 specifications typically reference temperatures of -40°C to +100°C with SAE requirements referencing -40°C to +121°C. Always consult manufacturer data for specific pressure ratings as these can differ between standards for the same nominal size.

How to Read Hydraulic Hose Markings

Understanding Hose Identification Codes

Hydraulic hoses are marked with critical information that identifies their pressure ratings and specifications. Understanding these markings is essential for proper selection and replacement.

Example Marking:

SAE 100R2AT - DN10 - WP 4000 PSI - BP 16000 PSI

Marking Component	Meaning	Example Value
SAE 100R2AT	Standard and construction type	Two-wire braid hydraulic hose
DN (Diameter Nominal)	Nominal inside diameter in millimeters	DN10 = 10mm (⅜”)
WP (Working Pressure)	Maximum continuous operating pressure	4,000 PSI
BP (Burst Pressure)	Minimum failure pressure (4× WP)	16,000 PSI
Manufacturer Code	Production facility identification	Factory specific
Date Code	Manufacturing date	Year/week of production
TP (Test Pressure)	May be marked as proof pressure reference	8,000 PSI

Additional Markings to Look For

EN 853 2SN – European equivalent to SAE 100R2AT
ISO 18752 – Impulse performance grade
Temperature range – Operating limits (-40°C to +100°C typical)
MSHA designation – Mine Safety and Health Administration approval
Lot/batch number – Traceability for quality control

How Pressure Ratings Differ Across SAE and EN Standards

SAE J517 Standard Overview

The SAE J517 standard provides specifications for hydraulic hoses used in mobile and stationary equipment. The 100R-series hoses are the most common classifications with pressure ratings as shown in the complete chart above.

EN 853 and EN 857 Standards

European standards EN 853 (for braided hoses) and EN 857 (for compact braided hoses) maintain similar 4:1 safety requirements. Working pressure ranges for EN 853 2SN hoses range from 80 bar to 415 bar depending on diameter, with corresponding burst pressures maintaining the 4:1 ratio.

ISO 18752 Performance Grades

ISO 18752 introduces a different approach based on impulse performance rather than construction type. This standard categorizes hoses by pressure impulse cycles:

Grade	Impulse Cycles	Typical Application
Grade A	100,000	Light-duty, intermittent use
Grade B	250,000	Medium-duty equipment
Grade C	500,000	Heavy-duty machinery
Grade D	1,000,000	Extreme high-impulse applications

For a deeper breakdown of these testing protocols, see our full guide on SAE vs ISO vs DIN hydraulic hose standards.

How to Select the Right Hose Based on Pressure Requirements

Step 1: Determine Your System’s Maximum Operating Pressure

Measure the highest pressure your hydraulic system reaches during normal operation. Include pressure spikes that may occur during startup, valve actuation, or load changes.

Step 2: Identify Pressure Spike Events

Use oscilloscopes or pressure transducers to capture transient pressure events. Industry testing has shown that spike pressures often exceed measured steady-state pressures by 20-35%.

Step 3: Calculate Minimum Working Pressure Requirement

Add 15-20% safety margin to maximum observed pressure
Consider the highest pressure spike value as the minimum requirement
Working Pressure Required ≥ (Maximum System Pressure) × 1.2

Step 4: Verify Burst Pressure Compliance

Minimum Burst Pressure = Working Pressure Required × 4
Confirm selected hose meets or exceeds this calculation

Step 5: Check Temperature Derating

For temperatures above 100°C, consult manufacturer derating charts
Working pressure typically reduces 3-5% per 10°C above 100°C

Can Old Hydraulic Hoses Lose Burst Pressure?

Yes. As hydraulic hoses age, their actual burst pressure capacity declines. Factors that reduce burst pressure over time include:

Oxidation and ozone exposure – Deteriorates rubber compounds
Temperature cycling – Accelerates material degradation
Pressure fatigue – Micro-damage accumulates in reinforcement layers
Fluid exposure – Chemical incompatibility weakens internal layers
Mechanical stress – Abrasion and bending reduce structural integrity

A hose that originally had a 16,000 psi burst pressure may have a significantly reduced actual burst pressure after years of service. This is why hoses should be replaced based on service life and inspection results, not just operating pressure monitoring.

Real Example: Selecting a Hose for a 3,500 PSI Excavator System

System Requirements

Maximum operating pressure: 3,500 psi
Peak pressure spikes: 4,200 psi (during boom lift and swing operations)
Ambient temperature: 80°C (176°F)
Application: Excavator main hydraulic circuit
Duty cycle: Intermittent, high-impulse operation (8-12 hours/day)

Hose Selection Analysis

Candidate Hose	Working Pressure	Burst Pressure	Safety Factor	Compatibility
SAE 100R1AT ½”	2,180 psi	8,720 psi	2.5×	Inadequate
SAE 100R2AT ½”	3,350 psi	13,400 psi	3.8×	Marginal
SAE 100R2AT ⅜”	4,000 psi	16,000 psi	4.6×	Approved

Recommended Selection: SAE 100R2AT ⅜”

Why it works:

Operating pressure (3,500 psi) is 12.5% below working pressure rating (4,000 psi)
Provides 500 psi (14%) operating margin above peak system pressure
Minimum burst pressure (16,000 psi) exceeds required 14,000 psi (3,500 × 4)
Maintains full 4.6× safety factor when considering the 4,200 psi pressure spikes
Complies fully with SAE J517 requirements for high-impulse applications
Temperature rating exceeds 80°C requirements

How to Choose Between SAE 100R2, 100R12, and 100R15

Type	Pressure Capability	Cost	Flexibility	Typical Applications
SAE 100R2AT	Medium (WP up to 6,000 psi)	Low	High	General construction, agriculture, mobile equipment
SAE 100R12	High (WP up to 4,000 psi)	Medium	Medium	Heavy equipment, high-impulse systems
SAE 100R15	Ultra-high (WP up to 6,000 psi)	High	Lower	Extreme pressure systems, mining, offshore

Selection Decision Guide

Your Requirement	Recommended Hose Type
Pressure ≤ 3,000 psi, standard mobile use	SAE 100R1AT or SAE 100R2AT
Pressure 3,000-5,000 psi, heavy-duty	SAE 100R2AT
Pressure 4,000 psi, high-impulse	SAE 100R12
Pressure ≥ 5,000 psi, extreme service	SAE 100R13 or SAE 100R15
Space-constrained installation	SAE 100R17
High impulse cycles (>500,000)	ISO 18752 Grade C or higher

5 Common Hydraulic Hose Pressure Rating Mistakes

Mistake #1: Using Burst Pressure as Operating Pressure

Many engineers incorrectly reference burst pressure when designing systems. This is dangerous. Burst pressure is a laboratory destruction threshold, not an operating parameter. Always select hoses based on working pressure.

Mistake #2: Ignoring Pressure Spikes

Failing to account for transient pressure spikes leads to premature hose failure. Transducer measurements consistently show that peak pressure events can exceed gauge readings by 30% or more. Always add a safety margin to peak spike values.

Mistake #3: Choosing Hose Based Only on Diameter

Selecting hoses by size alone disregards pressure requirements. A ½” hose in 100R1AT (2,180 psi WP) has significantly different capability than 100R2AT (3,350 psi WP). Evaluate both flow requirements and pressure capacity.

Mistake #4: Ignoring Temperature Derating

High temperatures reduce working pressure capacity. System operating above 100°C requires careful derating. Many failures occur because temperature effects on pressure capacity were not considered.

Mistake #5: Mixing SAE and EN Specifications

SAE and EN hoses with similar numbers may have different pressure ratings. Always verify the specific standard and construction type. For example, EN 853 2SN specifications differ from SAE 100R2AT in some size ranges.

Visual Inspection Checklist

Inspect hydraulic hoses regularly for:

Cover damage – Cuts, abrasions, or exposed reinforcement
Bloating or swelling – Internal layer separation causing visible expansion
Cracking – Especially near fittings where stress concentrations occur
Leakage – Pinhole leaks can indicate imminent failure
Kinking or crushing – Reduces pressure capacity and accelerates fatigue
Fitting corrosion – May compromise connection integrity

Symptom	Possible Cause	Corrective Action
Reduced system pressure	Internal hose swelling restricting flow	Replace hose, verify pressure
Slow cycle times	Reinforcement damage causing expansion	Immediate replacement required
Unusual system noise	Internal layer separation	Replace hose, inspect system
Visible hose movement	Reinforcement failure	Emergency replacement needed
Cover blistering	Fluid permeation, layer separation	Replace hose, verify compatibility

Replacement Criteria

Replace hoses immediately when:

Working pressure consistently exceeds the rated pressure
Visible damage to the outer cover exposes reinforcement
Hoses have exceeded their recommended service life
Pressure testing reveals reduced burst capacity
Fittings show signs of corrosion or damage
Hose has been subjected to temperatures exceeding rated limits

Hydraulic Hose Pressure Conversion Chart

PSI to Bar Quick Reference

PSI	Bar	Common Application
1,000	69	Low-pressure return lines
1,500	103	Agricultural implements
2,000	138	Medium-duty systems
2,500	172	Light construction equipment
3,000	207	Mobile equipment standard
3,500	241	Excavator main circuits
4,000	276	High-pressure systems
4,500	310	Heavy-duty equipment
5,000	345	Ultra-high pressure
6,000	414	Extreme pressure applications

PSI to Bar Conversion Formula

To convert PSI to Bar:
Bar = PSI ÷ 14.5

To convert Bar to PSI:
PSI = Bar × 14.5

Hydraulic Hose Selection Reference Table

System Operating Pressure	Recommended Working Pressure (1.2× Operating)	Minimum Required Burst Pressure (4× Working)	Recommended SAE Hose Type
1,000 psi	1,200 psi	4,800 psi	100R1AT ½” or 100R17 ½”
1,500 psi	1,800 psi	7,200 psi	100R1AT ⅜”
2,000 psi	2,400 psi	9,600 psi	100R2AT ½” or 100R1AT ¼”
2,500 psi	3,000 psi	12,000 psi	100R2AT ½” or 100R17 all sizes
3,000 psi	3,600 psi	14,400 psi	100R2AT ⅜”
3,500 psi	4,200 psi	16,800 psi	100R2AT ⅜” or 100R12 ½”
4,000 psi	4,800 psi	19,200 psi	100R12 ½” or 100R13 ¾”
4,500 psi	5,400 psi	21,600 psi	100R13 ½”
5,000 psi	6,000 psi	24,000 psi	100R15 ¾”

Free Hydraulic Hose Pressure Chart

Includes complete specifications for:

SAE 100R1AT – Single wire braid (WP: 575-3,270 psi, BP: 2,300-13,080 psi)
SAE 100R2AT – Two wire braid (WP: 1,150-6,000 psi, BP: 4,500-24,000 psi)
SAE 100R12 – Four spiral wire (WP: 4,000 psi, BP: 16,000 psi)
SAE 100R13 – Four/six spiral wire (WP: 5,000 psi, BP: 20,000 psi)
SAE 100R15 – Six spiral wire (WP: 6,000 psi, BP: 24,000 psi)
EN 853 1SN – Single braid (European equivalent to 100R1AT)
EN 853 2SN – Double braid (European equivalent to 100R2AT)

Contact HENGHUA to request a downloadable PDF version of the complete hydraulic hose pressure rating chart.

Frequently Asked Questions

Q: Is burst pressure the same as maximum pressure?

A: No. Burst pressure is the pressure at which the hose fails during laboratory testing. The maximum allowable operating pressure is the rated working pressure, which is typically one-quarter of the burst pressure.

Q: Can hydraulic hoses operate at burst pressure?

A: No. Operating near burst pressure is extremely dangerous and violates SAE safety standards. Hoses should never be operated above their rated working pressure.

Q: How much higher should burst pressure be than working pressure?

A: Burst pressure must be at least four times higher than working pressure per SAE J517, EN 853, and ISO standards. This is known as the 4:1 safety factor.

Q: What safety factor is used for hydraulic hoses?

A: The standard safety factor for hydraulic hoses is 4:1 (burst pressure to working pressure). Some applications may require higher safety factors, typically 5:1 or 6:1.

Q: What happens when a hose exceeds working pressure?

A: Exceeding working pressure accelerates fatigue damage, reduces service life, progressively lowers burst pressure capacity, and increases catastrophic failure risk.

Q: What is proof pressure?

A: Proof pressure is typically twice the hose working pressure. It is used during production testing to verify structural integrity without causing permanent damage.

Q: How is burst pressure tested?

A: Burst pressure is tested per SAE J343 and ISO 1402 by increasing internal pressure at a controlled rate until hose failure occurs.

Q: What is the difference between SAE 100R1AT and 100R2AT pressure ratings?

A: SAE 100R2AT has two wire braids compared to one in 100R1AT, providing higher working and burst pressures. 100R2AT working pressure ranges from 1,150-6,000 psi versus 575-3,270 psi for 100R1AT.

Q: Can pressure spikes exceed working pressure?

A: SAE-rated hoses are tested to withstand some pressure spikes (typically up to 133% of working pressure). However, repeated spikes accumulate fatigue damage that reduces service life.

Q: How does temperature affect hydraulic hose pressure ratings?

A: High temperatures reduce both working and burst pressure ratings. Consult manufacturer derating charts for applications exceeding 100°C.

Q: What is hydraulic hose pressure spike tolerance?

A: Pressure spike tolerance is typically 33% above working pressure under impulse testing conditions. However, repeated spike events reduce overall hose service life.

Q: What are the EN 853 hose pressure ratings?

A: EN 853 1SN (single braid) ranges from 80-300 bar. EN 853 2SN (double braid) ranges from 80-415 bar. Both maintain the 4:1 burst ratio requirement.

Q: What is the SAE J517 hydraulic hose standard?

A: SAE J517 establishes specifications for hydraulic hoses used in mobile and stationary equipment. It defines construction, dimensions, and performance requirements including the 4:1 burst ratio.

Q: How do I determine what working pressure I need?

A: Measure maximum system operating pressure, identify peak pressure spikes, add 15-20% safety margin, and select a hose with working pressure exceeding this calculated value.

Q: Are higher-rated hydraulic hoses always better?

A: Higher-rated hoses generally provide better safety margins but may have larger bend radii and higher costs. Select based on actual system requirements rather than overspecifying.

Q: What is hose proof pressure?

A: Proof pressure is a factory test pressure, typically 2× working pressure, applied to verify hose integrity during production. Hoses should never be operated at proof pressure in service.

Q: Can burst pressure change over time?

A: Yes. Exposure to temperature extremes, incompatible fluids, mechanical damage, and pressure cycling can progressively reduce the actual burst pressure of a hose below its rated value.

Q: Does hose diameter affect pressure rating?

A: Yes. For the same construction type, smaller diameter hoses typically have higher pressure ratings. Larger diameters have lower pressure capacity due to increased hoop stress.

Q: What is hydraulic hose derating?

A: Derating is the reduction in working pressure for operating conditions outside standard parameters, typically at elevated temperatures or with certain fluid types.

Q: What causes hydraulic hose burst failures?

A: Common causes include operating above working pressure, pressure spike damage, reinforcement corrosion, cover damage from abrasion, heat aging, and improper fitting installation.

Q: What is the difference between working pressure and maximum pressure?

A: Working pressure is the rated maximum for continuous operation. Maximum pressure may refer to transient spike limits, which can be higher than working pressure but are not sustained.

Q: How do I calculate burst pressure from working pressure?

A: Multiply the working pressure by the safety factor (minimum 4). For example, 4,000 psi working pressure × 4 = 16,000 psi minimum burst pressure.

Q: What is the standard safety factor for hydraulic hoses?

A: The standard safety factor is 4:1 under SAE J517 and EN standards. Some manufacturers and applications use higher factors like 5:1 or 6:1 for enhanced safety.

Q: What does WP mean on a hydraulic hose?

A: WP stands for Working Pressure (or Working Pressure rating), indicating the maximum safe continuous operating pressure in PSI or Bar.

Q: What does BP mean on a hydraulic hose?

A: BP stands for Burst Pressure, indicating the minimum pressure at which the hose will fail during destructive testing.

Q: What is the difference between WP, BP, and TP?

A: WP (Working Pressure) is the maximum safe continuous operating pressure. BP (Burst Pressure) is the minimum failure pressure. TP (Test Pressure) is typically the proof pressure used for factory testing, usually 2× WP.

Q: How do I read SAE hose markings?

A: Look for the SAE standard number (e.g., 100R2AT), the hose size (DN or dash size), WP value (working pressure), and BP value (burst pressure). These markings identify the hose’s pressure capacity and construction.

Q: What pressure causes a hydraulic hose to burst?

A: A hydraulic hose bursts when internal pressure exceeds the rated burst pressure. However, actual failure pressure in service is often lower due to accumulated fatigue damage, temperature exposure, and mechanical wear.

Q: How often should hydraulic hoses be pressure tested?

A: Industry best practice recommends pressure testing upon installation, after any repair, at least annually for critical applications, and following any severe pressure event.

Q: Can old hydraulic hoses lose burst pressure?

A: Yes. Aging from oxidation, ozone, temperature cycling, pressure fatigue, and chemical exposure progressively reduces the actual burst pressure capacity of hoses over time.

Q: Why do hydraulic hoses fail below rated burst pressure?

A: Fatigue damage accumulates over time due to pressure cycling, mechanical stress, heat aging, and fluid compatibility issues, causing hoses to fail below their original rated burst pressure.

Hydraulic Hose Safety Standards Reference

Key Industry Standards

Standard	Scope	Application
SAE J517	Hydraulic hose types, pressure ratings, 4:1 burst ratio	Primary US standard for hydraulic hoses
SAE J343	Test methods for hydraulic hoses	Burst, impulse, and proof pressure testing
ISO 18752	Impulse performance grades	High-impulse mobile equipment applications
EN 853	Braided hydraulic hoses	European standard, 4:1 burst ratio
EN 857	Compact braided hoses	Tight installations, 4:1 burst ratio
ISO 1402	Rubber/plastic hose test methods	International testing standard
MSHA	Mine Safety and Health Administration	Mining equipment compliance

Request a Hydraulic Hose Pressure Review

Send us your system specifications and receive a professional recommendation:

System operating pressure
Peak pressure spike data
Fluid type and compatibility requirements
Operating temperature range
Required hose size (diameter and length)
Application type (mobile, industrial, offshore, etc.)
Impulse cycling frequency

Our engineers will recommend:

Correct SAE or EN hose standard
Required working pressure rating
Minimum burst pressure verification
Suitable fittings and assembly specifications
Expected service life estimation
Alternative hose options with cost-benefit analysis

Contact HENGHUA today for a free professional hose selection recommendation.