Oil & Gas
CRS PLUS sources rotating equipment for oil and gas, utility and process duty — centrifugal and positive-displacement pumps, submersible pumps, air and gas compressors, and the seals, couplings and spares that keep them running — sized against the process datasheet and supplied with performance and hydrostatic test certificates.
Sourced through the qualified supplier base. Listing does not indicate stock held by CRS PLUS — availability, origin and lead time are confirmed per enquiry, and every quotation states the certification that governs the supply.
Specified by flow, head, NPSH available, fluid properties and materials.
Constant flow against varying pressure; selected for viscosity, solids and metering accuracy.
Cast iron, stainless and duplex; with control panels and level switches on request.
Air compressors specified by free-air delivery, pressure and duty; gas compressors by gas composition, suction and discharge conditions.
Spares identified by pump model and serial number or by drawing.
Assembled and tested as a package where required.
The duty point and the fluid define the pump. The parameters below are what a pump datasheet contains and what an enquiry should state.
| Parameter | What it defines | Common values |
|---|---|---|
| Duty point | Rated flow and differential head | m³/h and metres, or l/min and bar |
| NPSH available | Net positive suction head at the installation | Metres; must exceed pump NPSH required with margin |
| Fluid | What is pumped | Name, viscosity, specific gravity, temperature, solids content, vapour pressure |
| Materials | Casing, impeller, shaft and wear parts | Cast iron; carbon steel; 316 stainless; duplex; API 610 material class S-4, C-6, A-8 etc. |
| Seal | Shaft sealing arrangement | Packed gland; single or double mechanical seal; API 682 plan 11, 52, 53 |
| Driver | Motor or engine | kW, voltage, frame, IE class, Ex rating; diesel engine for firewater |
| Design standard | Construction and test standard | ISO 5199 / ISO 2858 general; API 610 heavy-duty; API 674/675/676 for PD; NFPA 20 fire pumps |
| Test grade | Performance test acceptance | ISO 9906 grade 1, 2 or 3; API 610 test |
| Compressor duty | Air or gas delivery | FAD in m³/min, discharge pressure in bar g, duty cycle; gas composition for gas compressors |
The two standards most often quoted on a centrifugal pump enquiry, and when each is appropriate.
| Property | API 610 | ISO 5199 / ISO 2858 |
|---|---|---|
| Written for | Petroleum, petrochemical and gas industry heavy-duty service | General chemical and process service |
| Design margin | Heavier casings, higher pressure ratings, 20-year design life | Standard industrial construction |
| Seal chamber | API 682 seal chamber dimensions | Standard stuffing box |
| Testing | Mandatory performance and hydrostatic tests, NPSH test optional | Performance test to ISO 9906 |
| Documentation | Extensive: datasheets, curves, drawings, quality plan | Standard |
| Cost | Higher | Lower |
| Specify when | Hydrocarbon service, refinery, offshore, operator standard requires it | Utility water, chemical, general process |
No manufacturer-specific figures are published here: CRS PLUS sources from several mills and manufacturers and each issues its own certificate, which governs. These are the documents a pump or compressor delivery will normally include.
| Document or test | Standard or method |
|---|---|
| Performance test certificate | ISO 9906 or API 610: flow, head, power, efficiency, NPSH |
| Hydrostatic test certificate | 1.5 × maximum allowable working pressure |
| Material certificates | EN 10204 3.1 for casing, impeller and shaft |
| Mechanical running test | Vibration and bearing temperature at rated speed |
| Motor test certificate | IEC 60034 routine test |
| Seal drawing and plan | API 682 seal plan schematic |
| General arrangement and sectional drawings | With parts list |
| Datasheet | ISO or API format, completed |
| Compressor FAD test | ISO 1217 for air compressors |
| Installation, operation and maintenance manual | Per unit |
Net positive suction head is the pressure margin above the fluid’s vapour pressure at the pump suction. The installation provides NPSH available; the pump requires NPSH required. If available is less than required, the fluid vaporises in the impeller — cavitation — causing noise, loss of performance and damage. NPSH available must be stated on every centrifugal pump enquiry, and the selected pump must have a margin below it.
Centrifugal pumps suit high flows of low-viscosity fluids at moderate pressures and are the default for water and light hydrocarbons. Positive-displacement pumps deliver a fixed volume per revolution regardless of pressure, and are used for viscous fluids, precise metering, high pressures at low flows, shear-sensitive products and self-priming duties. Screw pumps for oils, gear pumps for viscous liquids, diaphragm pumps for chemicals and slurries, and dosing pumps for injection.
API 682 standardises mechanical seals and their support systems for pumps, and defines numbered piping plans. Plan 11 recirculates pumped fluid from discharge to the seal chamber and is the most common. Plan 52 and 53 are dual-seal arrangements with an unpressurised or pressurised barrier fluid for hazardous or toxic service. The plan is specified on the pump datasheet and determines what auxiliary equipment is supplied.
An air-operated double-diaphragm pump uses compressed air to flex two diaphragms alternately, drawing fluid in and pushing it out. It has no seals or rotating parts in contact with the fluid, can run dry, self-primes, handles solids and viscous fluids, and is intrinsically safe in hazardous areas because it has no electrical drive. It is the standard choice for chemical transfer, drum unloading, sump duty and slurries where high pressure and efficiency are not the priority.
By the pump manufacturer, model and serial number from the nameplate, together with the part number from the sectional drawing or parts list. Where the original documentation is missing, a photograph of the nameplate and the part, with dimensions, allows identification. Common spares — mechanical seals, bearings, wear rings, impellers, diaphragm kits — are stocked or quickly available for most current models.
The pump datasheet, or the duty point (flow and head), NPSH available, the fluid with viscosity, specific gravity, temperature and solids content, materials of construction, seal arrangement, driver requirements, the applicable design standard, hazardous-area rating and quantity. For an existing pump, the nameplate details.
CRS PLUS sources pumps and compressors from its qualified supplier base of certified manufacturers in Europe, Asia and the Gulf. Origin and test certification are stated on each quotation. CRS PLUS does not name manufacturers on this page and holds no distribution or agency agreement with any of them.
A structured offer follows within 72 hours.