A chemical hose marking must state the service the hose is approved for and its maximum allowable working pressure (MAWP), and it must not state burst pressure or test pressure at all. Electrostatic performance is set by the electrical grade of the hose construction, and it is confirmed by measurement rather than by anything printed
Chemical Hose Marking and Electrostatic Requirements Explained Read More »
A US facility capable of transferring oil or hazardous material in bulk to or from a vessel has to meet the hose rules in USCG 33 CFR 154. The rules fix three hard numbers. Minimum design burst pressure must be at least 4 × (relief-valve setting plus static head). Maximum allowable working pressure (MAWP) must
USCG 33 CFR 154: Hose Requirements for Chemical Transfer Facilities Read More »
A chemical hose testing certificate proves exactly what its scope states, no more and no less. A design approval proves that a design or a product range met a named standard under stated conditions. A pressure test certificate proves that one assembly held a stated pressure at one point in time. A material certificate proves
Chemical Hose Testing and Type Examination: What Certificates Prove Read More »
To read a hose chemical resistance chart, find the four conditions behind each rating: the medium and its concentration, the temperature, the exposure time, and whether contact is continuous or intermittent. Treat the printed grade as a screening aid, not a decision. The chart tells you where to look; it does not tell you what
Hose Chemical Resistance Chart: How to Read It and Apply It Read More »
A chemical compatibility database is a first screen, not a verdict. It narrows a long list of tube compounds down to the two or three worth investigating for a given medium. It cannot see your concentration, your temperature, your contamination or your cleaning chemicals. Matching hose material to media is therefore a short, ordered job,
Chemical Compatibility Database: Matching Hose Material to Media Read More »
There is no single acid resistant hose that is correct for hydrochloric acid, sulfuric acid and nitric acid at the same time, because the three acids attack hose materials by different mechanisms. Scope of this page. This page covers tube, cover, fitting and gasket selection for three mineral acids: hydrochloric, sulfuric and nitric. Three values
Acid Resistant Hose: Materials for Hydrochloric, Sulfuric and Nitric Acid Read More »
A solvent hose is selected by its tube compound, not by its reinforcement, because each common solvent family attacks rubber in a different way. The tube has to carry toluene, xylene, acetone, MEK (methyl ethyl ketone), esters, glycol ethers and chlorinated cleaners without swelling, softening or releasing particles into the fluid. The four deciding variables
Solvent Hose: Choosing a Hose for Solvents and Paint Transfer Read More »
In practice the answer is a compound choice: EPDM (ethylene propylene diene monomer) for dilute caustic and hot water, and a polyolefin or fluoropolymer tube for stronger, hotter or higher-purity duty. A caustic hose for sodium hydroxide or potassium hydroxide service must hold a strongly alkaline liquid, survive the heat it is usually handled at,
Caustic Hose Selection for NaOH and KOH Service Read More »
A composite hose chemical resistance table tells you what a medium does to the hose wall at the temperature the table was built for. Two things are usually missed: the temperature the rating belongs to, and the pressure it carries. The headline working pressure in a datasheet is stated at a reference condition, and it
Composite Hose Chemical Resistance Table: Derating With Temperature Read More »
A chemical suction and discharge hose is one assembly that has to do two opposite jobs. It holds its shape against vacuum while the pump pulls, and it carries pressurized fluid on the way out. What a hose can do on each side depends on its construction, above all an internal helix or other embedded
Chemical Suction and Discharge Hose: Types and Pressure Ratings Read More »
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