This section discusses the information required for us to provide a pump quotation and lists any assumptions we are likely to make.
Minimum information required
provide you with a quotation – even a budget quotation – we need to have the
information in this section.
Please provide us with your preferred contact details.
Unless you tell us otherwise, we assume that the pump will be used in a country where English is the official language.
Equipment in Ireland and the Netherlands will only be supported locally if it is ordered through our distributor in the country in question. For this reason, if equipment is required for one of these countries, then a quotation should be obtained from our distributor, not directly from MDM Pumps Ltd.
2. Type of pump
MDM Pumps Ltd manufactures, assembles and tests three types of centrifugal pump:
i) Flooded suction pump; eg delivery pump, transfer pump.
ii) Air Separator (‘AS’) pump: for handling liquid-air mixtures without air locking (a centrifugal pump cannot pump air); eg for scavenging tanks or unloading road tankers.
iii) Air Separator pump with self-priming (‘SP’) reservoir: only required if the suction line will be empty at start-up; eg when the liquid level is below the inlet of the pump.
Unless you inform us that the pump is for a scavenging or road tanker unloading duty then we will assume you require a flooded suction centrifugal pump.
Liquid ring pumps
MDM Pumps Ltd also assembles and tests liquid ring pumps using parts manufactured in the EU. These self-priming pumps have been designed to handle a wide range of liquids including liquids containing air bubbles and foam. See 'CR' versus 'AS' document.
Strainers and Vent valves
MDM Pumps Ltd also manufactures strainers, air escape (‘AE’) vent valves and air pass (‘AP’) vent valves.
If you specify two different flows, please identify whether this is because the flow is approximate or whether the pump is to operate at both flows.
Unless otherwise specified, the term ‘gallons’ will be taken to mean UK gallons.
Differential Head = Discharge (Outlet) Head – Suction (Inlet) Head
If you give us separate suction and discharge head (or pressure) figures, please
give us the ‘worst case’; ie the minimum suction head available and
the maximum discharge head required. You must tell us if the suction
pressure is less than 0 gauge.
The information listed in this section is also essential if we are to provide you with a quotation. However, if you are not able to provide it, we shall assume that the product to be pumped is as water at 22°C.
Please tell us:
- The name of the product;
- If the product contains any caustic (acidic or alkaline) chemicals.
- If the product contains salt (sodium chloride = NaCl) or any other
Warning: chlorine compounds corrode stainless steel.
- If the product might crystallise or leave deposits when exposed to
- If the product might contain any solids. If so:
- The maximum concentrations (percentages, weight for weight,
or molarities) of any mixtures, solid suspensions, or solutions (eg “Solution of 5% glycol in
water”). For sugar solutions / syrups the percentage concentration of sugar,
weight for weight, is known as the ºBrix.
- If the product is dangerous (flammable, toxic, corrosive or oxidising).
- If the product has a boiling point that is lower than water.
- The minimum specific heat capacity of the product, if an ATEX certificate
will be required.
Note: If the product is for CIP (Cleaning In Place).
We shall assume a product density equal to that of water at 22°C, ie 998 kg/m³ (0.998 g/cm³, kg/l or kg/dm³; sg 1.0) unless you tell us otherwise.
We shall assume a viscosity equal to that of water at 22°C, ie 1 cP unless you tell us
You must tell us the maximum temperature of the product if this is over
Further information required
If you are unable to provide us with the information in this section, we shall make appropriate assumptions on your behalf.
9. Internal surface finish (wetted metal parts)
What internal surface finish do you require? Do you require the wetted metal parts to be electropolished or passivated?
10. Pipework size
Please tell us the diameter (eg 1”) of both your suction and your discharge pipework. Unless you tell us otherwise, we will assume 16 sw gauge for pipe diameters up to and including 4”.
What connections type do you require and what sizes would you prefer for the suction (inlet) and discharge (outlet)?
Do you want the pump to be fitted with a drain? If so, do you require a simple drain fitting or do you want us to weld a drain valve directly into the pump casing? What drain orientation do you require and what should the size and type of the connection be?
Where a pump-and-motor unit is to be cleaned with a high-pressure hose, we recommend that the motor be protected by a cowl.
If there is a risk of an alloy motor being splashed by a caustic (acidic or
alkaline) liquid, or a liquid containing a chlorine compound such as salt, then
we recommend that the motor be protected by a cowl.
Do you require an acoustic (‘AK’) cowl for reduced noise?
What prime mover do you require: electric, petrol, diesel or air?
Do you require an IE3 or IE4 motor, for example to qualify for The Enhanced Capital Allowance scheme (ECA) for energy-efficient products?
Do you require the pump to be operated with a VSD (Variable Speed/Frequency
Drive)? If so, unless you request otherwise we will assume that an inverter will
be supplied by others.
What are the ambient conditions?
- the atmosphere is:
- the pump will be located 0 to 1000 m above sea level;
- the pump is to be used indoors;
If the ambient temperature or altitude is higher, then cooling of the motor becomes less effective and the maximum power at which the motor can be operated is reduced.
Do you need any documentation or want us to comply with special standards? See 'Pump standards' document.
NPSHA is important for applications such as CIP, WFI and wort.
Unless you tell us otherwise, we will assume that your system will provide sufficient NPSHA to prevent the pump from cavitating (ie when the liquid vaporises inside the pump).
If the temperature of the liquid being pumped is greater than 40ºC or if the suction pressure is less than 0 gauge, then you must tell us the minimum plant NPSHA or both the maximum temperature of the liquid and the minimum plant suction head1 at that temperature.
Note: NPSHA and suction head are not the same thing. When giving values please be sure which information you are giving. If in doubt, please ask for assistance.
Plant NPSHA = Plant suction head1 - Vapour head2
1 After taking into account the atmospheric pressure (ie it must be an absolute value) and also the pressure losses in the suction pipework.
2 Vapour pressure of product, converted into metres head of liquid.
We will recommend the mechanical seal that we believe is most appropriate for
your requirements, based on the information you supply us.
Is there a maximum allowable noise level? Unless you tell us otherwise, we will assume that any maximum noise level you state corresponds to the noise level at the duty flow, and for pumps operated at variable speeds, at the operating frequency needed to achieve the duty point.
Please let us know if you have a special requirement for a steep or flat
characteristic pump curve.