|What is the sulphur content of our stainless steel 316 fittings?||In this product range, the allowable sulphur content is 0 to 0.30%. Typically, sulphur is somewhere between 0.015 and 0.025%.|
|The customer asked for 316L, but received parts marked 316. The HCT says they are 316L. Are they mis-marked?||Parker pipe fittings are dual certified 316/316L, but we only ever mark our parts as 316. If the HCT says 316L. then they are. Parker tube fittings (A-LOK) are different and must be made from 316L, or 316. (i.e. are not dual certified)|
|What are the markings on the hex faces of our fittings for?||These are the Heat Code Traceability (HCT) markings that allow us to trace material back to its original source, to ensure material compliance.|
|Can your fittings be used with Hydrogen? Or Ammonia? (Or any other specific media?)||Responsibility for the use of a product remains with the end user, and Parker can make no recommendations as to which media to use. All Parker can do is offer our products with the specifications and standards that they meet in order for the customer to make the informed decision whether Parker product is suitable for their requirement|
|Can Parker provide cryogenic cleaning?||No|
|Can we have HCT and/or mill certificate for A-LOK made from brass?||No, This is due to the brass material in the United States not being HCT certified|
|What is the leak rate of an A-LOK connection?||We expect the leakage rate result from A-LOK fittings to be "less than the uncertainty of measurement" (presumably of the test equipment) which equates to <1 x 10 -8 mbar L/S.|
|What are the pressure ratings for 6Mo (or any other material) NPT ends?||We use stainless steel ratings, or whichever is lowest. We use the stainless steel pressure ratings from the Parker fittings guide, we compare this rating with the pressure rating of the 6Mo tube and take the lowest figure as the maximum allowable pressure( also allowing for the operating temperature.|
|Does A-LOK have ABS Approval?||A-LOK has ABS (American Bureau of Shipping) approval for the next five years so far for UK and China (as of 2015)|
|What is the helium leak rate of A-LOK fittings?||The helium leakage rate does of course depend on how well the seal is made by the on site fitter, but we have recorded helium leak rate of 1x10-7 std atm cc/s on A-LOK fittings. We measure leakage using helium and would expect the result to be "less than the uncertainty of measurement" which equates to <1 x 10 -8 mbar L/S.|
|Do we have ROK certification for A-LOK?||No|
|Do we have technical passports for A-LOK in Russian?||No|
|Can soft annealed copper be used with A-LOK?||Yes, but the fittings must be brass.|
|Are our fittings 316 or 316L?||They are 316 as standard. If 316L is required they need to be specifically ordered as such.|
|What are the tolerances of our ferrules?||We do not provide tolerance information on our ferrules as this is confidential information.|
|We understand that existing gap gauge is "no go gauge" which must not go between the nut and the body Hex for proper make up. Do we have a "go gauge" which must go between the nut and the body to prevent over turn of the nut?||There is not a "go" gauge - when the A-LOK is remade the nut can be tightened a little further to maintain a leak free joint. We do not have a specific over tightening measurement - use the 1 1/4 principle that can be increased slightly if joint is not tight enough.|
|Does a Mud Dauber Fitting (MDF) cause any problems with back pressure?||We have never had any reported problems with this.|
|Can we weld an NPT connection in place?||This has been done on flange connectors, so yes. Obviously, it cannot then be removed and our warranty will not cover this. We would prefer the use of a weld fitting.|
|What are the advantaged and disadvantages between A-LOK and CPI?||CPI is simpler to assemble as there are less parts to lose, and can only be assembled correctly or incorrectly. A-LOK has more parts, and can be assembled many different ways, only one of which is correct. A-LOK doesn't apply any torque to the tube. The rear ferrule locks the fitting in place during tightening, and doesn't allow the transfer of any torque to the tube. CPI is moly coated, which significantly reduces make-up torque.|
|What is the maximum tube hardness you recommend for a 316 system?||We recommend a max hardness of 90 HRB for a 316/316 system|
|What kind of fittings do you recommend for underwater (subsea) installations (150m depth)?||A-LOK will work at these depths, ROVs (Remote Operated Vehicles) go much deeper and they use two ferrule fittings. What you need to know is what wall thickness tubing? The thicker the better (within our guidelines) to resist the tubing wall collapsing from external pressure.|
|We have a 625 material fitting. Hardness requirements according to NACE MR0175/ISO15156-2 is 22HRC Max, but the hardness specified in the Material Test Cert doesn't comply?||The hardness requirement of 22 HRC Max is, according to NACE MR0175 and Table A.2, applicable to products made from stainless steel. The products that you are inquiring about are made of Alloy 625, which is a Nickel Alloy, and does not fall into the ''stainless steel' category. NACE MR0175 outlines different metallurgical requirements for Nickel Alloys (including Alloy 625), and a maximum hardness of 35 HRC for this alloy in particular.|
|We required A-LOK fittings made from 316 but with a minimum molybdenum content of 2.5%?||Yes, we can offer A-LOK fittings with 2.5% Molybdenum, but this must be clearly stated in the PO (Purchase Order)
|Are Parker A-LOK fittings solution annealed?||All the 316 and 6Mo range is heat treated to this condition. However, parts made from bar, such as nuts or straight bodies, will undertake a cold size operation afterwards, to ensure the right finish and tolerance. Please note that 316 + 2.5% Moly range will be made strictly from bar, we do not forge this grade.|
|What are the advantages of 6Mo over Duplex?||The main difference between 6Mo and Super Duplex is the design criteria behind the development of these two alloys if you like. 6Mo was developed as a far superior corrosion resistant alternative to the stainless steel 300 series (316), especially in chloride containing environments (seawater for instance). So 6Mo development focused on corrosion behavior purely. However, it also offered mechanical advantage over the 300 steel series. 6Mo is typically about 50% stronger than 316.
The Duplex steels (such as 2507) were developed to offer a combination of mechanical and corrosion advantage. So corrosion resistance was improved with regards to the 300 series, and so was strength. As I said before, Super Duplex is a good material of choice for given applications. However, in 80% of the applications that I see, when a customer consider replacing 300 with either 6Mo or Super Duplex, the main driver is corrosion resistance and not mechanical performance (higher pressures). In such cases, 6Mo is always the best alternative due to the following:
6Mo is an austenitic steel while 2507 is a Duplex steel. In metallurgical terms, this means that 2507 is a far more complex alloy. Therefore, 6Mo is a much easier to melt, process and heat treat alloy. Being the behavior of these two alloys very dependent on processing and heat treatment, it means that more things can go wrong with Super Duplex than with 6Mo. The consequence of wrong processing and heat treatment is embrittlement and poor corrosion behavior. Due to the amount of different detrimental phases that can form on Super Duplex, it is also difficult to spot defects during testing.
2507, as I mentioned before, have higher strength than 6Mo. However, when it comes to certain environments, such as seawater, this is bad news, as the higher the strength, the more chances of cracking under the right conditions.
There something call the 'PREN' or pitting resistance equivalent number, which is a measure of corrosion performance. The higher that number is, the better. In 6Mo, whichever the chemistry, PREN is always over 42. In 2507, PREN can go from as low as 37 to 45. So a Super Duplex on the low range will offer less corrosion resistance than any of the 'off the shelf' 6Mo. If we start specifying 2507 with higher PREN we are then limiting the availability and increasing lead times. Also worth noting, that most of the 6Mo and 2507 applications must be NACE compliant, and NACE establishes different operating ranges for alloys with PREN < 40 and > 40.
In summary, 2507 is the material I would select if 6Mo could not reach the desired pressure ratings. But if 6Mo can do the job mechanically, it is, in metallurgical terms, a better choice
|What is the max working pressure of a mud dauber fitting? (MDF fitting)||The MDF fitting is a hollow plug with a mesh screen across it. The mesh is simply a coarse-meshed screen to prevent insects from nesting within the fitting. It has a negligible effect on pressure retention as there is essentially no pressure boundary across the mesh. It's conceivable that an highly explosive increase of pressure would damage it, but this is not something we have tested for.|
|Can we use the Hyferset presetting hand pump with the Phastite tool?||No, they use different pumps.|
|What does the suffix 'YC' mean on a fitting part number?||It means 'yellow cap', used to cover the nut and thread. As opposed to our normal red or blue one|
|Who's product is Partek?||Partek product are Veriflo products - contact Veriflo or email email@example.com for details.|
|Can we supply oxygen clean A-LOK?||Yes, add 'C3' as a suffix.|
|What is the minimum order quantity for A-LOK?||They are sold in boxes of five, so this could be considered the minimum order.|
|Can you supply A-LOK in a magnetic material? 316 is not magnetic||This is not a yes/no question. All our materials are magnetic to different degrees, and even 316 can vary in magnetism depending on the raw material's fabrication method, with cast 316 being magnetic and wrought 316 being non-magnetic. Customers are invited to review our materials available and make a decision based on what we have available. We can send a sample if they press.|
|Can Parker A-LOK fittings be used for subsea applications?
||The tubing as always is the determining factor. The pressure is from the outside as well as the inside. A-LOK will work providing the tubing does not collapse. A-LOK is used by subsea tree manufacturers and BOP's (Blowout Preventer), also it is used on ROV's. We have only salt spray tests with regards to corrosion. If the customer specifies a particular material, then they must be happy with the material for subsea usage. To summarize, if the tubing is a thick enough wall to resist collapsing A-LOK will be fine for sub-sea usage and has been for many years.|
|What are the temperature limits for a tube fitting?||There are no formal limits set. The material is the limiting factor, and so the tube will fail before the fitting does.|
|Tell me about silver plating.||A-LOK nuts are silver plated internally. First Parker treat the surface with nickel to provide a 'key' and a good surface for the silver to adhere to. The silver is 100% silver, and is applied to a thickness of 2 to 3 um. It's purpose is anti-corrosion and torque reduction on make up.|
|Can we have a manual for maintenance and installation of Hyferset?||You will find the relevant information within the Parker Instrument Tube Fitting Installation Manual - Bulletin number 4200-B4.|
|Can you use PFA tubing with Parker A-LOK fittings?||The official assembly instructions are the same as for metal tubing. But in experience there is a danger to cut through the tubing. So tighten until it feels snug around 3/4 to 1 turn or change the ferrule to a CPI as this does not cut the tubing as much.|
|What is the difference between 'intermixable' and 'interchangable'?||Intermixable means you can use any combination of parts and it will still work. For example, a Swagelok nut with an A-LOK ferrule. Interchangeable means you can swap only nuts and ferrules together. i.e. a CPI nut and ferrule will fit another companies body, but a CPI nut won't work with a that company’s ferrule.|
|Are A-LOK fittings always marked with the material code?||If they are made from a forging, then they are marked as the material. Note that 316L forgings are not available. If 316L is required, then the part will be machined from flat bar. In that situation, only the HCT (heat trace code) is marked, from which we can track back to the original material melt at the material supplier. If they are made from hex bar, as in the case of 8SC8, then the body will be only marked with the HCT code, not the material. Nuts are always marked with the material.|
|Does Parker conform to TR2000 with regards to NORSOK?||Yes, in our case we do, as we use Statoil as the third party auditor. TR2000 = Statoil approve list of NSK manufacturers.|
|What sealants/sealing tape should be used with PFA fittings?||PTFE tape is recommended. See PFA pipe fittings section for assembly procedure in Catalogue 4181
|Does Parker fittings have IGC as per ASTM A262 practice A, or E?||On 316 Parker offer ISC Practice A as standard, which incorporates practice E. Test is to ASTM A262 Practice or European equivalent ISO DIA66. These are generated for each customer on request|
|Does Parker have a formal declaration that A-LOK is interchangeable/intermixable with another manufacturer?||Yes, but we created them for each customer. We need the company name, the company address and ideally a contact name.|
|Finger tight and snug tight using the Hyferset tool?||You cannot snug the fitting using the Hyferset. Snugging as you know is when you tighten the nut until the tubing is difficult to rotate and then go 1 1/4 turns, meaning you actually tighten the nut more then 1 1/4 turns.You cannot do this with the Hyferset. You can tighten the nut beyond half a turn by a little bit once the Hyferset assembly and when the spanner is used, would be the same effect.|
|Does Parker offer Cunifer material?||No we do not. Cunifer (sometimes spelled 'kunifer' is Copper-Nickel (90-10%). The closest in chemical terms is Monel 400, Copper-Nickel too in a different proportion (30-70%). It's a nasty material for welding or machining as the vapor and dust are carcinogenic. If it is not handling chlorides, 316 might be an alternative.|
|Can you use A-LOK (in 625) for temperatures up to 1500 deg F?||A-LOK in Alloy 625 is recommended up to temperatures of 1200 F according to ASME design codes. At that temp, the de-rating factor for your selected size/s would be 0.72. Some manufacturers claim that Alloy 625 can take up to 1500 F but continued exposure to this range will be likely to cause embrittlement, resulting in fatal failure eventually. We do not recommend A-LOK beyond 1200 F.|
|Can we intermix 316 and 2507 with Parker MPI fittings?||Yes, that's OK with MPI.14A74. Yes, both have been successfully used on vacuum service.|
|Can A-LOK/CPI be used for vacuum service?||Yes, both have been successfully used on vacuum service.|
|Is PT-D deburr tool and spare blades 226A available?||No, this is superseded by part number PT-D-R, which does not have spare blades.|
|Do 'FW' fittings have NPT ends?||Yes, they do have NPT connections.|
|Is the Hyferset CE marked?||No, it isn't, however, the Enerpac pump will meet the requirements of PED (Pressure Equipment Directive)|
|Can we have 3.1 certs front or back ferrules?||No, 3.1 certs are issued for nuts and bodies, but not ferrules.|
|Do port connectors have HCT marking?||No, not normally, as we machine away the hex where it is marked. We can do it though, if requested on the quote.|
|We have made up some fittings but the make up gauge will still GO. What do we do?||When using the gap gauge we do not want to have any under-make conditions. As such sometimes when you assemble to 1 1/4 turns exactly then the gauge will still go into the gap. Typically an additional 1/8 turn or less will result in the gauge no longer being able to enter the gap. Where there is any doubt, we would advise a slight additional make up of the fitting.|
|Can we offer an positional elbow (MSEL) with a form B thread? For example, M15MSEL1/2BR||No|
|At present the SBEx training needs to be every two years but customer want to repeat it every three years. Can you extend the validity period of the participant cards/certs ? ||Our standard interval for SBEx training is every 2 years. The reason for this is that over a 2 year period people can forget a lot of important things and pick up bad habits. The SBEx training is a major contributor to system safety and integrity. We would not recommend extending the interval to 3 years. Your customers needs to review their internal standards to ensure they are making the correct decisions for their activities|
|Can we have A-LOK in aluminum? The customer wants to save weight.||No, Aluminum is not hard enough, and is considered a fire risk in oil and gas. Titanium is the lightest option available.|
|Does it matter that after pre-assembly the ferrule can rotate around the tube?||No, this is not an issue. However the ferrule can't slide up and down the tube, and if it does it indicates an incorrect pre-assembly.|
|What effect does the quality of tube end finishing have on an A-LOK connection?||A very big effect. tube should be cut squarely with hacksaw, all burrs should be removed and tube should be cleaned i.e. with compressed air|
|Can you use 316 fittings on 304/304L tube?||Yes 316 fittings can be used on 304/304L tube|
|Lubricant is advised to be used on larger size A-LOKs. Which lubricant is recommended?||Any lubricant is acceptable to the A-LOK fitting. A lubricant is not specified in particular because it needs to be compatible with the media being used by the customer.|
|Can we provide a Zirconium ceramic coating on our fittings to prevent corrosion stress cracking? (CSS)||No, we don't offer this. Zirconium coating can be hard and brittle, and we are not convinced it will work well on fitting geometry. The assumption is by the time you've paid the extra cost of coating you may as well have selected a more corrosion resistant alloy. 625 or 6Mo are resistant to chloride-induced stress corrosion cracking.|
|Is there a PTFE or PTFE faced version of A-LOK?||No, this isn't an option.|
|Is the make-up procedure for A-LOK the same, regardless of material?||Yes, the material makes no difference.|
|What is the difference between BSPP DIN16288 and EN837?||DIN16288 is obsolete and has been superseded with EN837, in that DIN16288 has been combined into EN837.|
|What is the working pressure for a particular fitting||
For compression fittings, our fittings de-rate to the tubing being used. For example, 1/2" tube in 6mo with a wall thickness of 0.049 = pressure rating of 4600psi.
For a pipe fitting, then there is a pressure rating. See page 19 of the Fittings, Materials and Tubing guide.
|What information do you have regarding pipe fitting pressure ratings in materials other than 316?||
Pressure ratings for materials other than 316SS in pipe fitting form are controlled by relevant international coding. We do not as a general rule publish pressure ratings as codes and dates of codes change.
|Can we supply alok fittings with a Sulfinert or Silconert surface treatment?||
Yes we can.
Why do 625 a-lok fittings have an 825 back ferrule?
The reason why we use Alloy 825 back ferrules in Hastelloy C276/625 is the treatment that rear ferrules undertake. Rear ferrules are normally hardened to create a safe seal. In our case, we have a proprietary process call Suparcase, that not only achieves this increase in hardness, but also significantly increases corrosion resistance, reduce wear, etc.
The reason why 825 is preferred over Alloy C276, is because Alloy 825 ''suparcases'' better than C276 due to its chemistry and unique alloy properties. By the time that the Alloy 825 back ferrule takes this treatment, both the corrosion resistance and mechanical properties are very much in line with those that you would expect for Alloy C276.
We have done this for a number of decades and have many successful applications out there to date.
Can we have an A-lok connection in carbon steel?
Yes, this is available. Check out the product series page here
What does CPI stand for?
Crawford Parker Interchange. A Parker employee, Mr Crawford, designed a single ferrule connection but then left Parker, taking it with him to another company. Parker designed a compatible fitting and called it CPI. The less romantic explanation is that it stands for ‘chemical process interface’.