Uyini umehluko phakathi kwepayipi eliyisikwele elinothayela kanye nepayipi eliyisikwele elijwayelekile? Ingabe ukhona umehluko ekumelaneni nokugqwala? Ingabe ububanzi bokusebenzisa buyafana?

Kukhona umehluko omkhulu olandelayo phakathi kwamashubhu ayisikwele anathayela namashubhu ayisikwele ajwayelekile:
**Ukumelana nokugqwala**:
-Umbhobho oyisikwele ophekiweinokumelana nokugqwala okuhle. Ngokwelashwa kwama-galvanized, kwakhiwa ungqimba lwe-zinc ebusweni be-tube yesikwele, engamelana ngokuphumelelayo nokuguguleka kwemvelo yangaphandle, njengomswakama, amagesi abolayo, njll, futhi andise impilo yesevisi.
- Okuvamileamashubhu squarezisengozini yokugqwala, futhi zingagqwala futhi zilimaze ngokushesha ezindaweni ezithile ezinokhahlo.

**Ukubonakala**:
-Ishubhu yensimbi yesikwele egandayiweinongqimba oluthayela phezulu, ngokuvamile ebonisa okumhlophe okusasiliva.
- Ishubhu yesikwele esivamile umbala wemvelo wensimbi.

**Sebenzisa**:
- I-galvanized square tubeivame ukusetshenziswa ezikhathini ezidinga ukuvikelwa okuphezulu kokugqwala, njengesakhiwo sangaphandle sesakhiwo, amapayipi amapayipi nokunye.
- Amapayipi avamile ayisikwele nawo asetshenziswa kakhulu, kodwa angase angafaneleki kancane kwezinye izindawo ezigqwalile.

**Intengo**:
- Ngenxa yezindleko zenqubo yokufaka uthayela, amashubhu ayisikwele anathayela ngokuvamile abiza kakhulu kunamashubhu ayisikwele avamile.
Isibonelo, lapho kwakhiwa amashalofu ensimbi angaphandle, uma indawo ezungezile inomswakama noma ijwayele ukuthintana nezinto ezonakalisayo, ukusetshenziswa kwamashubhu ayisikwele aphekiwe kuzoba okuthembekile futhi okuqinile; kuyilapho kwezinye izakhiwo zasendlini ezingadingi ukuvikelwa okuphezulu kokugqwala, amashubhu avamile ayisikwele angase anele ukuhlangabezana nezidingo futhi angonga izindleko.