Oil & Gas
Industrial pumps and compressors
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.
Product families
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.
Centrifugal pumps
- —End-suction pumps to ISO 2858 / ISO 5199 for general process and utility
- —API 610 overhung (OH), between-bearings (BB) and vertical (VS) pumps where specified
- —Vertical multistage and horizontal split-case pumps for water and firewater
- —Self-priming and slurry pumps
Specified by flow, head, NPSH available, fluid properties and materials.
Positive-displacement pumps
- —Screw pumps — twin and three-screw — for oil transfer and lubrication
- —Gear and progressive-cavity pumps for viscous and shear-sensitive fluids
- —Air-operated double-diaphragm pumps for chemicals, slurries and drum transfer
- —Dosing and chemical-injection pumps to API 675; plunger pumps
Constant flow against varying pressure; selected for viscosity, solids and metering accuracy.
Submersible and sump pumps
- —Submersible sewage and drainage pumps
- —Deep-well borehole pumps
- —Vertical sump pumps for pits and tanks
Cast iron, stainless and duplex; with control panels and level switches on request.
Compressors
- —Rotary screw air compressors, oil-injected and oil-free, with dryers and filtration
- —Reciprocating air compressors for instrument and plant air
- —Gas compressors — reciprocating and screw — on request against the process datasheet
- —Blowers and vacuum pumps
Air compressors specified by free-air delivery, pressure and duty; gas compressors by gas composition, suction and discharge conditions.
Seals, couplings and spares
- —Mechanical seals to API 682, cartridge and component types, with seal support systems
- —Flexible and spacer couplings
- —Impellers, wear rings, shafts, bearings and casings
- —Repair kits for diaphragm and dosing pumps
Spares identified by pump model and serial number or by drawing.
Packages and accessories
- —Baseplates, motors and drives assembled as a unit
- —Pressure relief, strainers and pulsation dampeners
- —Control panels, VFDs and instrumentation
Assembled and tested as a package where required.
How pumps and compressors are specified
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 |
API 610 vs ISO 5199 — which pump standard
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 |
What the test certificates and documents state
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 |
Supply terms
- Origin
- Sourced per enquiry from a qualified supplier base of mills and manufacturers in China, India, Europe and the Gulf. Origin and certifying body are stated on each quotation.
- Incoterms
- Ex-works and FOB as standard. CIF, CFR and DAP available to GCC, Levant, Red Sea, East and West African destinations.
- Documentation
- Mill test certificate to EN 10204 3.1 as standard, 3.2 with third-party witness on request; commercial invoice, packing list, bill of lading, certificate of origin.
- Inspection
- Third-party inspection at source available on request through recognised inspection agencies. Inspection scope agreed on the purchase order.
- Lead time
- Standard sizes and grades from stock to six weeks. Made-to-order items and large parcels eight to sixteen weeks. Confirmed per quotation.
- Enquiry detail
- The pump datasheet, or: flow, head, NPSH available, fluid and its properties, materials, seal arrangement, driver details, design standard, hazardous-area rating and quantity. For compressors: free-air delivery, pressure, duty and air quality required.
Questions
Frequently asked questions
What is NPSH and why does it matter?
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.
When is a positive-displacement pump used rather than a centrifugal?
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.
What is an API 682 seal plan?
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.
What is an AODD pump?
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.
How are spare parts identified?
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.
What is needed to quote a pump?
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.
Where is the equipment sourced from?
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.
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